GitHub/moto-9609/android_kernel_motorola_exynos9610.git
8 years agoKVM: ARM64: Fix typos
Andrea Gelmini [Sat, 21 May 2016 11:53:14 +0000 (13:53 +0200)]
KVM: ARM64: Fix typos

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoKVM: ARM: Fix typos
Andrea Gelmini [Sat, 21 May 2016 11:48:35 +0000 (13:48 +0200)]
KVM: ARM: Fix typos

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Print unknown load/store encodings
James Hogan [Tue, 14 Jun 2016 08:40:17 +0000 (09:40 +0100)]
MIPS: KVM: Print unknown load/store encodings

When trying to emulate an unrecognised load or store instruction, print
the encoding to aid debug.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Dump guest tlbs if kvm_get_inst() fails
James Hogan [Tue, 14 Jun 2016 08:40:16 +0000 (09:40 +0100)]
MIPS: KVM: Dump guest tlbs if kvm_get_inst() fails

If kvm_get_inst() fails to find a guest TLB mapping for the guest PC
then dump the guest TLB entries. The contents of the guest TLB is likely
to be more interesting than the host TLB entries.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Trace guest register access emulation
James Hogan [Tue, 14 Jun 2016 08:40:15 +0000 (09:40 +0100)]
MIPS: KVM: Trace guest register access emulation

Trace emulation of guest access to various registers via
MFC0/MTC0/DMFC0/DMTC0 instructions (coprocessor 0) and the RDHWR
instruction (hardware registers exposed to userland), replacing some
existing kvm_debug calls. Trace events are much more practical for this
kind of debug output.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Add guest mode switch trace events
James Hogan [Tue, 14 Jun 2016 08:40:14 +0000 (09:40 +0100)]
MIPS: KVM: Add guest mode switch trace events

Add a few trace events for entering and coming out of guest mode, as well
as re-entering it from a guest exit exception.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Add kvm_asid_change trace event
James Hogan [Tue, 14 Jun 2016 08:40:13 +0000 (09:40 +0100)]
MIPS: KVM: Add kvm_asid_change trace event

Add a trace event for guest ASID changes, replacing the existing
kvm_debug call.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Clean up kvm_exit trace event
James Hogan [Tue, 14 Jun 2016 08:40:12 +0000 (09:40 +0100)]
MIPS: KVM: Clean up kvm_exit trace event

Clean up the MIPS kvm_exit trace event so that the exit reasons are
specified in a trace friendly way (via __print_symbolic), and so that
the exit reasons that derive straight from Cause.ExcCode values map
directly, allowing a single trace_kvm_exit() call to replace a bunch of
individual ones.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Add kvm_aux trace event
James Hogan [Tue, 14 Jun 2016 08:40:11 +0000 (09:40 +0100)]
MIPS: KVM: Add kvm_aux trace event

Add a MIPS specific trace event for auxiliary context operations
(notably FPU and MSA). Unfortunately the generic kvm_fpu trace event
isn't flexible enough to handle the range of interesting things that can
happen with FPU and MSA context.

The type of state being operated on is traced:
- FPU: Just the FPU registers.
- MSA: Just the upper half of the MSA vector registers (low half already
       loaded with FPU state).
- FPU & MSA: Full MSA vector state (includes FPU state).

As is the type of operation:
- Restore: State was enabled and restored.
- Save: State was saved and disabled.
- Enable: State was enabled (already loaded).
- Disable: State was disabled (kept loaded).
- Discard: State was discarded and disabled.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
[Fix remaining occurrence of "fpu_msa", change to "aux". - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Generalise fpu_inuse for other state
James Hogan [Tue, 14 Jun 2016 08:40:10 +0000 (09:40 +0100)]
MIPS: KVM: Generalise fpu_inuse for other state

Rename fpu_inuse and the related definitions to aux_inuse so it can be
used for lazy context management of other auxiliary processor state too,
such as VZ guest timer, watchpoints and performance counters.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Use va in kvm_get_inst()
James Hogan [Thu, 9 Jun 2016 13:19:21 +0000 (14:19 +0100)]
MIPS: KVM: Use va in kvm_get_inst()

Like other functions, make use of a local unsigned long va, for the
virtual address of the PC. This reduces the amount of verbose casting of
the opc pointer to an unsigned long.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Combine handle_tlb_ld/st_miss
James Hogan [Thu, 9 Jun 2016 13:19:20 +0000 (14:19 +0100)]
MIPS: KVM: Combine handle_tlb_ld/st_miss

The handle_tlb_ld/st_miss handlers are logically equivalent and
textually almost identical, so combine their implementations into a
single kvm_trap_emul_handle_tlb_miss().

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Use MIPS_ENTRYLO_* defs from mipsregs.h
James Hogan [Thu, 9 Jun 2016 13:19:19 +0000 (14:19 +0100)]
MIPS: KVM: Use MIPS_ENTRYLO_* defs from mipsregs.h

Convert KVM to use the MIPS_ENTRYLO_* definitions from <asm/mipsregs.h>
rather than custom definitions in kvm_host.h

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Simplify TLB_* macros
James Hogan [Thu, 9 Jun 2016 13:19:18 +0000 (14:19 +0100)]
MIPS: KVM: Simplify TLB_* macros

Simplify some of the TLB_ macros making use of the arrayification of
tlb_lo. Basically we index the array by the bit of the virtual address
which determines whether the even or odd entry is used, instead of
having a conditional.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Arrayify struct kvm_mips_tlb::tlb_lo*
James Hogan [Thu, 9 Jun 2016 13:19:17 +0000 (14:19 +0100)]
MIPS: KVM: Arrayify struct kvm_mips_tlb::tlb_lo*

The values of the EntryLo0 and EntryLo1 registers for a TLB entry are
stored in separate members of struct kvm_mips_tlb called tlb_lo0 and
tlb_lo1 respectively. To allow future code which needs to manipulate
arbitrary EntryLo data in the TLB entry to be simpler and less
conditional, replace these members with an array of two elements.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Use dump_tlb_all() for kvm_mips_dump_host_tlbs()
James Hogan [Thu, 9 Jun 2016 13:19:16 +0000 (14:19 +0100)]
MIPS: KVM: Use dump_tlb_all() for kvm_mips_dump_host_tlbs()

KVM implements its own routine for dumping the host TLB entries, but we
already have dump_tlb_all() which does something very similar (although
it only prints out TLB entries which match the current ASID or are
global).

Make KVM use dump_tlb_all() along with dump_tlb_regs() to avoid the
duplication and inevitable bitrot, allowing TLB dumping enhancements
(e.g. for VZ and GuestIDs) to be made in a single place.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Clean up TLB management hazards
James Hogan [Thu, 9 Jun 2016 13:19:15 +0000 (14:19 +0100)]
MIPS: KVM: Clean up TLB management hazards

KVM's host TLB handling routines were using tlbw hazard barrier macros
around tlb_read(). Now that hazard barrier macros exist for tlbr, update
this case to use them.

Also fix various other unnecessary hazard barriers in this code.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Restore host EBase from ebase variable
James Hogan [Thu, 9 Jun 2016 13:19:14 +0000 (14:19 +0100)]
MIPS: KVM: Restore host EBase from ebase variable

The host kernel's exception vector base address is currently saved in
the VCPU structure at creation time, and restored on a guest exit.
However it doesn't change and can already be easily accessed from the
'ebase' variable (arch/mips/kernel/traps.c), so drop the host_ebase
member of kvm_vcpu_arch, export the 'ebase' variable to modules and load
from there instead.

This does result in a single extra instruction (lui) on the guest exit
path, but simplifies the code a bit and removes the redundant storage of
the host exception base address.

Credit for the idea goes to Cavium's VZ KVM implementation.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Drop unused hpa0/hpa1 args from function
James Hogan [Thu, 9 Jun 2016 13:19:13 +0000 (14:19 +0100)]
MIPS: KVM: Drop unused hpa0/hpa1 args from function

The function kvm_mips_handle_mapped_seg_tlb_fault() has two completely
unused pointer arguments, hpa0 and hpa1, for which all users always pass
NULL.

Drop these two arguments and update the callers.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Simplify even/odd TLB handling
James Hogan [Thu, 9 Jun 2016 13:19:12 +0000 (14:19 +0100)]
MIPS: KVM: Simplify even/odd TLB handling

When handling TLB faults in the guest KSeg0 region, a pair of physical
addresses are read from the guest physical address map. However that
process is rather convoluted with an if/then/else statement. Simplify it
to just clear the lowest bit for the even entry and set the lowest bit
for the odd entry.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Don't indirect KVM functions
James Hogan [Thu, 9 Jun 2016 13:19:11 +0000 (14:19 +0100)]
MIPS: KVM: Don't indirect KVM functions

Several KVM module functions are indirected so that they can be accessed
from tlb.c which is statically built into the kernel. This is no longer
necessary as the relevant bits of code have moved into mmu.c which is
part of the KVM module, so drop the indirections.

Note: is_error_pfn() is defined inline in kvm_host.h, so didn't actually
require the KVM module to be loaded for it to work anyway.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Move non-TLB handling code out of tlb.c
James Hogan [Thu, 9 Jun 2016 13:19:10 +0000 (14:19 +0100)]
MIPS: KVM: Move non-TLB handling code out of tlb.c

Various functions in tlb.c perform higher level MMU handling, but don't
strictly need to be statically built into the kernel as they don't
directly manipulate TLB entries. Move these functions out into a
separate mmu.c which will be built into the KVM kernel module. This
allows them to directly reference KVM functions in the KVM kernel module
in future.

Module exports of these functions have been removed, since they aren't
needed outside of KVM.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Make various Cause variables 32-bit
James Hogan [Thu, 9 Jun 2016 13:19:09 +0000 (14:19 +0100)]
MIPS: KVM: Make various Cause variables 32-bit

The CP0 Cause register is passed around in KVM quite a bit, often as an
unsigned long, even though it is always 32-bits long.

Resize it to u32 throughout MIPS KVM.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Convert code to kernel sized types
James Hogan [Thu, 9 Jun 2016 13:19:08 +0000 (14:19 +0100)]
MIPS: KVM: Convert code to kernel sized types

Convert the MIPS KVM C code to use standard kernel sized types (e.g.
u32) instead of inttypes.h style ones (e.g. uint32_t) or other types as
appropriate.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Convert headers to kernel sized types
James Hogan [Thu, 9 Jun 2016 13:19:07 +0000 (14:19 +0100)]
MIPS: KVM: Convert headers to kernel sized types

Convert the MIPS kvm_host.h structs, function declaration prototypes and
associated definition prototypes to use standard kernel sized types
(e.g. u32) instead of inttypes.h style ones (e.g. uint32_t).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Drop unused kvm_mips_sync_icache()
James Hogan [Thu, 9 Jun 2016 13:19:06 +0000 (14:19 +0100)]
MIPS: KVM: Drop unused kvm_mips_sync_icache()

The function kvm_mips_sync_icache() is unused, so lets remove it.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Drop unused host_cp0_entryhi
James Hogan [Thu, 9 Jun 2016 13:19:05 +0000 (14:19 +0100)]
MIPS: KVM: Drop unused host_cp0_entryhi

The host EntryHi in the KVM VCPU context is virtually unused. It gets
stored on exceptions, but only ever used in a kvm_debug() when a TLB
miss occurs.

Drop it entirely, removing that information from the kvm_debug output.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Drop unused guest_inst from kvm_vcpu_arch
James Hogan [Thu, 9 Jun 2016 13:19:04 +0000 (14:19 +0100)]
MIPS: KVM: Drop unused guest_inst from kvm_vcpu_arch

The MIPS kvm_vcpu_arch::guest_inst isn't used, so drop it from the
struct and drop its asm-offsets definition.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMerge branch 'kvm-mips-fixes' into HEAD
Paolo Bonzini [Tue, 14 Jun 2016 09:00:16 +0000 (11:00 +0200)]
Merge branch 'kvm-mips-fixes' into HEAD

Merge MIPS patches destined to both 4.7 and kvm/next, to avoid
unnecessary conflicts.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Fix CACHE triggered exception emulation
James Hogan [Thu, 9 Jun 2016 09:50:46 +0000 (10:50 +0100)]
MIPS: KVM: Fix CACHE triggered exception emulation

When emulating TLB miss / invalid exceptions during CACHE instruction
emulation, be sure to set up the correct PC and host_cp0_badvaddr state
for the kvm_mips_emlulate_tlb*_ld() function to pick up for guest EPC
and BadVAddr.

PC needs to be rewound otherwise the guest EPC will end up pointing at
the next instruction after the faulting CACHE instruction.

host_cp0_badvaddr must be set because guest CACHE instructions trap with
a Coprocessor Unusable exception, which doesn't update the host BadVAddr
as a TLB exception would.

This doesn't tend to get hit when dynamic translation of emulated
instructions is enabled, since only the first execution of each CACHE
instruction actually goes through this code path, with subsequent
executions hitting the SYNCI instruction that it gets replaced with.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Don't unwind PC when emulating CACHE
James Hogan [Thu, 9 Jun 2016 09:50:45 +0000 (10:50 +0100)]
MIPS: KVM: Don't unwind PC when emulating CACHE

When a CACHE instruction is emulated by kvm_mips_emulate_cache(), the PC
is first updated to point to the next instruction, and afterwards it
falls through the "dont_update_pc" label, which rewinds the PC back to
its original address.

This works when dynamic translation of emulated instructions is enabled,
since the CACHE instruction is replaced with a SYNCI which works without
trapping, however when dynamic translation is disabled the guest hangs
on CACHE instructions as they always trap and are never stepped over.

Roughly swap the meanings of the "done" and "dont_update_pc" to match
kvm_mips_emulate_CP0(), so that "done" will roll back the PC on failure,
and "dont_update_pc" won't change PC at all (for the sake of exceptions
that have already modified the PC).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Include bit 31 in segment matches
James Hogan [Thu, 9 Jun 2016 09:50:44 +0000 (10:50 +0100)]
MIPS: KVM: Include bit 31 in segment matches

When faulting guest addresses are matched against guest segments with
the KVM_GUEST_KSEGX() macro, change the mask to 0xe0000000 so as to
include bit 31.

This is mainly for safety's sake, as it prevents a rogue BadVAddr in the
host kseg2/kseg3 segments (e.g. 0xC*******) after a TLB exception from
matching the guest kseg0 segment (e.g. 0x4*******), triggering an
internal KVM error instead of allowing the corresponding guest kseg0
page to be mapped into the host vmalloc space.

Such a rogue BadVAddr was observed to happen with the host MIPS kernel
running under QEMU with KVM built as a module, due to a not entirely
transparent optimisation in the QEMU TLB handling. This has already been
worked around properly in a previous commit.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoMIPS: KVM: Fix modular KVM under QEMU
James Hogan [Thu, 9 Jun 2016 09:50:43 +0000 (10:50 +0100)]
MIPS: KVM: Fix modular KVM under QEMU

Copy __kvm_mips_vcpu_run() into unmapped memory, so that we can never
get a TLB refill exception in it when KVM is built as a module.

This was observed to happen with the host MIPS kernel running under
QEMU, due to a not entirely transparent optimisation in the QEMU TLB
handling where TLB entries replaced with TLBWR are copied to a separate
part of the TLB array. Code in those pages continue to be executable,
but those mappings persist only until the next ASID switch, even if they
are marked global.

An ASID switch happens in __kvm_mips_vcpu_run() at exception level after
switching to the guest exception base. Subsequent TLB mapped kernel
instructions just prior to switching to the guest trigger a TLB refill
exception, which enters the guest exception handlers without updating
EPC. This appears as a guest triggered TLB refill on a host kernel
mapped (host KSeg2) address, which is not handled correctly as user
(guest) mode accesses to kernel (host) segments always generate address
error exceptions.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agokvm/x86: remove unnecessary header file inclusion
Kai Huang [Tue, 31 May 2016 05:21:14 +0000 (13:21 +0800)]
kvm/x86: remove unnecessary header file inclusion

arch/x86/kvm/iommu.c includes <linux/intel-iommu.h> and <linux/dmar.h>, which
both are unnecessary, in fact incorrect to be here as they are intel specific.

Building kvm on x86 passed after removing above inclusion.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: protect KVM_CREATE_PIT/KVM_CREATE_PIT2 with kvm->lock
Paolo Bonzini [Wed, 1 Jun 2016 12:09:24 +0000 (14:09 +0200)]
KVM: x86: protect KVM_CREATE_PIT/KVM_CREATE_PIT2 with kvm->lock

The syzkaller folks reported a NULL pointer dereference that seems
to be cause by a race between KVM_CREATE_IRQCHIP and KVM_CREATE_PIT2.
The former takes kvm->lock (except when registering the devices,
which needs kvm->slots_lock); the latter takes kvm->slots_lock only.
Change KVM_CREATE_PIT2 to follow the same model as KVM_CREATE_IRQCHIP.

Testcase:

    #include <pthread.h>
    #include <linux/kvm.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>
    #include <stdint.h>
    #include <string.h>
    #include <stdlib.h>
    #include <sys/syscall.h>
    #include <unistd.h>

    long r[23];

    void* thr1(void* arg)
    {
        struct kvm_pit_config pitcfg = { .flags = 4 };
        switch ((long)arg) {
        case 0: r[2]  = open("/dev/kvm", O_RDONLY|O_ASYNC);    break;
        case 1: r[3]  = ioctl(r[2], KVM_CREATE_VM, 0);         break;
        case 2: r[4]  = ioctl(r[3], KVM_CREATE_IRQCHIP, 0);    break;
        case 3: r[22] = ioctl(r[3], KVM_CREATE_PIT2, &pitcfg); break;
        }
        return 0;
    }

    int main(int argc, char **argv)
    {
        long i;
        pthread_t th[4];

        memset(r, -1, sizeof(r));
        for (i = 0; i < 4; i++) {
            pthread_create(&th[i], 0, thr, (void*)i);
            if (argc > 1 && rand()%2) usleep(rand()%1000);
        }
        usleep(20000);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: rename process_smi to enter_smm, process_smi_request to process_smi
Paolo Bonzini [Wed, 1 Jun 2016 20:26:01 +0000 (22:26 +0200)]
KVM: x86: rename process_smi to enter_smm, process_smi_request to process_smi

Make the function names more similar between KVM_REQ_NMI and KVM_REQ_SMI.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid simultaneous queueing of both IRQ and SMI
Paolo Bonzini [Wed, 1 Jun 2016 20:26:00 +0000 (22:26 +0200)]
KVM: x86: avoid simultaneous queueing of both IRQ and SMI

If the processor exits to KVM while delivering an interrupt,
the hypervisor then requeues the interrupt for the next vmentry.
Trying to enter SMM in this same window causes to enter non-root
mode in emulated SMM (i.e. with IF=0) and with a request to
inject an IRQ (i.e. with a valid VM-entry interrupt info field).
This is invalid guest state (SDM 26.3.1.4 "Check on Guest RIP
and RFLAGS") and the processor fails vmentry.

The fix is to defer the injection from KVM_REQ_SMI to KVM_REQ_EVENT,
like we already do for e.g. NMIs.  This patch doesn't change the
name of the process_smi function so that it can be applied to
stable releases.  The next patch will modify the names so that
process_nmi and process_smi handle respectively KVM_REQ_NMI and
KVM_REQ_SMI.

This is especially common with Windows, probably due to the
self-IPI trick that it uses to deliver deferred procedure
calls (DPCs).

Reported-by: Laszlo Ersek <lersek@redhat.com>
Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
Fixes: 64d6067057d9658acb8675afcfba549abdb7fc16
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Thu, 2 Jun 2016 22:08:06 +0000 (15:08 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
 "ARM:
   - two fixes for 4.6 vgic [Christoffer] (cc stable)

   - six fixes for 4.7 vgic [Marc]

  x86:
   - six fixes from syzkaller reports [Paolo] (two of them cc stable)

   - allow OS X to boot [Dmitry]

   - don't trust compilers [Nadav]"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
  KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
  KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
  KVM: fail KVM_SET_VCPU_EVENTS with invalid exception number
  KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
  kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
  KVM: Handle MSR_IA32_PERF_CTL
  KVM: x86: avoid write-tearing of TDP
  KVM: arm/arm64: vgic-new: Removel harmful BUG_ON
  arm64: KVM: vgic-v3: Relax synchronization when SRE==1
  arm64: KVM: vgic-v3: Prevent the guest from messing with ICC_SRE_EL1
  arm64: KVM: Make ICC_SRE_EL1 access return the configured SRE value
  KVM: arm/arm64: vgic-v3: Always resample level interrupts
  KVM: arm/arm64: vgic-v2: Always resample level interrupts
  KVM: arm/arm64: vgic-v3: Clear all dirty LRs
  KVM: arm/arm64: vgic-v2: Clear all dirty LRs

8 years agoKVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
Paolo Bonzini [Wed, 1 Jun 2016 12:09:23 +0000 (14:09 +0200)]
KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS

MOV to DR6 or DR7 causes a #GP if an attempt is made to write a 1 to
any of bits 63:32.  However, this is not detected at KVM_SET_DEBUGREGS
time, and the next KVM_RUN oopses:

   general protection fault: 0000 [#1] SMP
   CPU: 2 PID: 14987 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
   Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
   [...]
   Call Trace:
    [<ffffffffa072c93d>] kvm_arch_vcpu_ioctl_run+0x141d/0x14e0 [kvm]
    [<ffffffffa071405d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm]
    [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
    [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
    [<ffffffff817a0f2e>] entry_SYSCALL_64_fastpath+0x12/0x71
   Code: 55 83 ff 07 48 89 e5 77 27 89 ff ff 24 fd 90 87 80 81 0f 23 fe 5d c3 0f 23 c6 5d c3 0f 23 ce 5d c3 0f 23 d6 5d c3 0f 23 de 5d c3 <0f> 23 f6 5d c3 0f 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
   RIP  [<ffffffff810639eb>] native_set_debugreg+0x2b/0x40
    RSP <ffff88005836bd50>

Testcase (beautified/reduced from syzkaller output):

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <linux/kvm.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>

    long r[8];

    int main()
    {
        struct kvm_debugregs dr = { 0 };

        r[2] = open("/dev/kvm", O_RDONLY);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_CREATE_VCPU, 7);

        memcpy(&dr,
               "\x5d\x6a\x6b\xe8\x57\x3b\x4b\x7e\xcf\x0d\xa1\x72"
               "\xa3\x4a\x29\x0c\xfc\x6d\x44\x00\xa7\x52\xc7\xd8"
               "\x00\xdb\x89\x9d\x78\xb5\x54\x6b\x6b\x13\x1c\xe9"
               "\x5e\xd3\x0e\x40\x6f\xb4\x66\xf7\x5b\xe3\x36\xcb",
               48);
        r[7] = ioctl(r[4], KVM_SET_DEBUGREGS, &dr);
        r[6] = ioctl(r[4], KVM_RUN, 0);
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
Paolo Bonzini [Wed, 1 Jun 2016 12:09:22 +0000 (14:09 +0200)]
KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID

This causes an ugly dmesg splat.  Beautified syzkaller testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        struct kvm_irq_routing ir = { 0 };
        r[2] = open("/dev/kvm", O_RDWR);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_SET_GSI_ROUTING, &ir);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
Paolo Bonzini [Wed, 1 Jun 2016 12:09:21 +0000 (14:09 +0200)]
KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi

Found by syzkaller:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000120
    IP: [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
    PGD 6f80b067 PUD b6535067 PMD 0
    Oops: 0000 [#1] SMP
    CPU: 3 PID: 4988 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
    [...]
    Call Trace:
     [<ffffffffa0795f62>] irqfd_update+0x32/0xc0 [kvm]
     [<ffffffffa0796c7c>] kvm_irqfd+0x3dc/0x5b0 [kvm]
     [<ffffffffa07943f4>] kvm_vm_ioctl+0x164/0x6f0 [kvm]
     [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a1062>] tracesys_phase2+0x84/0x89
    Code: b5 71 a7 e0 5b 41 5c 41 5d 5d f3 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 8b 8f 10 2e 00 00 31 c0 48 89 e5 <39> 91 20 01 00 00 76 6a 48 63 d2 48 8b 94 d1 28 01 00 00 48 85
    RIP  [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
     RSP <ffff8800926cbca8>
    CR2: 0000000000000120

Testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <linux/kvm.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>

    long r[26];

    int main()
    {
        memset(r, -1, sizeof(r));
        r[2] = open("/dev/kvm", 0);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);

        struct kvm_irqfd ifd;
        ifd.fd = syscall(SYS_eventfd2, 5, 0);
        ifd.gsi = 3;
        ifd.flags = 2;
        ifd.resamplefd = ifd.fd;
        r[25] = ioctl(r[3], KVM_IRQFD, &ifd);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: fail KVM_SET_VCPU_EVENTS with invalid exception number
Paolo Bonzini [Wed, 1 Jun 2016 12:09:20 +0000 (14:09 +0200)]
KVM: fail KVM_SET_VCPU_EVENTS with invalid exception number

This cannot be returned by KVM_GET_VCPU_EVENTS, so it is okay to return
EINVAL.  It causes a WARN from exception_type:

    WARNING: CPU: 3 PID: 16732 at arch/x86/kvm/x86.c:345 exception_type+0x49/0x50 [kvm]()
    CPU: 3 PID: 16732 Comm: a.out Tainted: G        W       4.4.6-300.fc23.x86_64 #1
    Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
     0000000000000286 000000006308a48b ffff8800bec7fcf8 ffffffff813b542e
     0000000000000000 ffffffffa0966496 ffff8800bec7fd30 ffffffff810a40f2
     ffff8800552a8000 0000000000000000 00000000002c267c 0000000000000001
    Call Trace:
     [<ffffffff813b542e>] dump_stack+0x63/0x85
     [<ffffffff810a40f2>] warn_slowpath_common+0x82/0xc0
     [<ffffffff810a423a>] warn_slowpath_null+0x1a/0x20
     [<ffffffffa0924809>] exception_type+0x49/0x50 [kvm]
     [<ffffffffa0934622>] kvm_arch_vcpu_ioctl_run+0x10a2/0x14e0 [kvm]
     [<ffffffffa091c04d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm]
     [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812414a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71
    ---[ end trace b1a0391266848f50 ]---

Testcase (beautified/reduced from syzkaller output):

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>
    #include <linux/kvm.h>

    long r[31];

    int main()
    {
        memset(r, -1, sizeof(r));
        r[2] = open("/dev/kvm", O_RDONLY);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[7] = ioctl(r[3], KVM_CREATE_VCPU, 0);

        struct kvm_vcpu_events ve = {
                .exception.injected = 1,
                .exception.nr = 0xd4
        };
        r[27] = ioctl(r[7], KVM_SET_VCPU_EVENTS, &ve);
        r[30] = ioctl(r[7], KVM_RUN, 0);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
Paolo Bonzini [Wed, 1 Jun 2016 12:09:19 +0000 (14:09 +0200)]
KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID

This causes an ugly dmesg splat.  Beautified syzkaller testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        struct kvm_cpuid2 c = { 0 };
        r[2] = open("/dev/kvm", O_RDWR);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_CREATE_VCPU, 0x8);
        r[7] = ioctl(r[4], KVM_SET_CPUID, &c);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agokvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
Paolo Bonzini [Wed, 1 Jun 2016 12:09:18 +0000 (14:09 +0200)]
kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR

Found by syzkaller:

    WARNING: CPU: 3 PID: 15175 at arch/x86/kvm/x86.c:7705 __x86_set_memory_region+0x1dc/0x1f0 [kvm]()
    CPU: 3 PID: 15175 Comm: a.out Tainted: G        W       4.4.6-300.fc23.x86_64 #1
    Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
     0000000000000286 00000000950899a7 ffff88011ab3fbf0 ffffffff813b542e
     0000000000000000 ffffffffa0966496 ffff88011ab3fc28 ffffffff810a40f2
     00000000000001fd 0000000000003000 ffff88014fc50000 0000000000000000
    Call Trace:
     [<ffffffff813b542e>] dump_stack+0x63/0x85
     [<ffffffff810a40f2>] warn_slowpath_common+0x82/0xc0
     [<ffffffff810a423a>] warn_slowpath_null+0x1a/0x20
     [<ffffffffa09251cc>] __x86_set_memory_region+0x1dc/0x1f0 [kvm]
     [<ffffffffa092521b>] x86_set_memory_region+0x3b/0x60 [kvm]
     [<ffffffffa09bb61c>] vmx_set_tss_addr+0x3c/0x150 [kvm_intel]
     [<ffffffffa092f4d4>] kvm_arch_vm_ioctl+0x654/0xbc0 [kvm]
     [<ffffffffa091d31a>] kvm_vm_ioctl+0x9a/0x6f0 [kvm]
     [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812414a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71

Testcase:

    #include <unistd.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <string.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        memset(r, -1, sizeof(r));
r[2] = open("/dev/kvm", O_RDONLY|O_TRUNC);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0x0ul);
        r[5] = ioctl(r[3], KVM_SET_TSS_ADDR, 0x20000000ul);
        r[7] = ioctl(r[3], KVM_SET_TSS_ADDR, 0x20000000ul);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: Handle MSR_IA32_PERF_CTL
Dmitry Bilunov [Tue, 31 May 2016 14:38:24 +0000 (17:38 +0300)]
KVM: Handle MSR_IA32_PERF_CTL

Intel CPUs having Turbo Boost feature implement an MSR to provide a
control interface via rdmsr/wrmsr instructions. One could detect the
presence of this feature by issuing one of these instructions and
handling the #GP exception which is generated in case the referenced MSR
is not implemented by the CPU.

KVM's vCPU model behaves exactly as a real CPU in this case by injecting
a fault when MSR_IA32_PERF_CTL is called (which KVM does not support).
However, some operating systems use this register during an early boot
stage in which their kernel is not capable of handling #GP correctly,
causing #DP and finally a triple fault effectively resetting the vCPU.

This patch implements a dummy handler for MSR_IA32_PERF_CTL to avoid the
crashes.

Signed-off-by: Dmitry Bilunov <kmeaw@yandex-team.ru>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid write-tearing of TDP
Nadav Amit [Wed, 11 May 2016 15:04:29 +0000 (08:04 -0700)]
KVM: x86: avoid write-tearing of TDP

In theory, nothing prevents the compiler from write-tearing PTEs, or
split PTE writes. These partially-modified PTEs can be fetched by other
cores and cause mayhem. I have not really encountered such case in
real-life, but it does seem possible.

For example, the compiler may try to do something creative for
kvm_set_pte_rmapp() and perform multiple writes to the PTE.

Signed-off-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoMerge tag 'kvm-arm-for-v4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Radim Krčmář [Thu, 2 Jun 2016 15:28:04 +0000 (17:28 +0200)]
Merge tag 'kvm-arm-for-v4.7-rc2' of git://git./linux/kernel/git/kvmarm/kvmarm

KVM/ARM Fixes for v4.7-rc2

Fixes for the vgic, 2 of the patches address a bug introduced in v4.6
while the rest are for the new vgic.

8 years agoKVM: arm/arm64: vgic-new: Removel harmful BUG_ON
Marc Zyngier [Thu, 2 Jun 2016 08:24:06 +0000 (09:24 +0100)]
KVM: arm/arm64: vgic-new: Removel harmful BUG_ON

When changing the active bit from an MMIO trap, we decide to
explode if the intid is that of a private interrupt.

This flawed logic comes from the fact that we were assuming that
kvm_vcpu_kick() as called by kvm_arm_halt_vcpu() would not return before
the called vcpu responded, but this is not the case, so we need to
perform this wait even for private interrupts.

Dropping the BUG_ON seems like the right thing to do.

 [ Commit message tweaked by Christoffer ]

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoMerge tag 'pinctrl-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
Linus Torvalds [Wed, 1 Jun 2016 19:38:50 +0000 (12:38 -0700)]
Merge tag 'pinctrl-v4.7-2' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pin control fixes from Linus Walleij:
 "Here are three pin control fixes for v4.7.  Not much, and just driver
  fixes:

   - add device tree matches to MAINTAINERS

   - inversion bug in the Nomadik driver

   - dual edge handling bug in the mediatek driver"

* tag 'pinctrl-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: mediatek: fix dual-edge code defect
  MAINTAINERS: Add file patterns for pinctrl device tree bindings
  pinctrl: nomadik: fix inversion of gpio direction

8 years agoMerge tag 'dma-buf-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/sumits...
Linus Torvalds [Wed, 1 Jun 2016 19:32:25 +0000 (12:32 -0700)]
Merge tag 'dma-buf-for-4.7' of git://git./linux/kernel/git/sumits/dma-buf

Pull dma-buf updates from Sumit Semwal:

 - use of vma_pages instead of explicit computation

 - DocBook and headerdoc updates for dma-buf

* tag 'dma-buf-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/sumits/dma-buf:
  dma-buf: use vma_pages()
  fence: add missing descriptions for fence
  doc: update/fixup dma-buf related DocBook
  reservation: add headerdoc comments
  dma-buf: headerdoc fixes

8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Wed, 1 Jun 2016 05:28:28 +0000 (22:28 -0700)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix negative error code usage in ATM layer, from Stefan Hajnoczi.

 2) If CONFIG_SYSCTL is disabled, the default TTL is not initialized
    properly.  From Ezequiel Garcia.

 3) Missing spinlock init in mvneta driver, from Gregory CLEMENT.

 4) Missing unlocks in hwmb error paths, also from Gregory CLEMENT.

 5) Fix deadlock on team->lock when propagating features, from Ivan
    Vecera.

 6) Work around buffer offset hw bug in alx chips, from Feng Tang.

 7) Fix double listing of SCTP entries in sctp_diag dumps, from Xin
    Long.

 8) Various statistics bug fixes in mlx4 from Eric Dumazet.

 9) Fix some randconfig build errors wrt fou ipv6 from Arnd Bergmann.

10) All of l2tp was namespace aware, but the ipv6 support code was not
    doing so.  From Shmulik Ladkani.

11) Handle on-stack hrtimers properly in pktgen, from Guenter Roeck.

12) Propagate MAC changes properly through VLAN devices, from Mike
    Manning.

13) Fix memory leak in bnx2x_init_one(), from Vitaly Kuznetsov.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (62 commits)
  sfc: Track RPS flow IDs per channel instead of per function
  usbnet: smsc95xx: fix link detection for disabled autonegotiation
  virtio_net: fix virtnet_open and virtnet_probe competing for try_fill_recv
  bnx2x: avoid leaking memory on bnx2x_init_one() failures
  fou: fix IPv6 Kconfig options
  openvswitch: update checksum in {push,pop}_mpls
  sctp: sctp_diag should dump sctp socket type
  net: fec: update dirty_tx even if no skb
  vlan: Propagate MAC address to VLANs
  atm: iphase: off by one in rx_pkt()
  atm: firestream: add more reserved strings
  vxlan: Accept user specified MTU value when create new vxlan link
  net: pktgen: Call destroy_hrtimer_on_stack()
  timer: Export destroy_hrtimer_on_stack()
  net: l2tp: Make l2tp_ip6 namespace aware
  Documentation: ip-sysctl.txt: clarify secure_redirects
  sfc: use flow dissector helpers for aRFS
  ieee802154: fix logic error in ieee802154_llsec_parse_dev_addr
  net: nps_enet: Disable interrupts before napi reschedule
  net/lapb: tuse %*ph to dump buffers
  ...

8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Linus Torvalds [Wed, 1 Jun 2016 05:20:56 +0000 (22:20 -0700)]
Merge git://git./linux/kernel/git/davem/sparc

Pull sparc fixes from David Miller:
 "sparc64 mmu context allocation and trap return bug fixes"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Fix return from trap window fill crashes.
  sparc: Harden signal return frame checks.
  sparc64: Take ctx_alloc_lock properly in hugetlb_setup().

8 years agosfc: Track RPS flow IDs per channel instead of per function
Jon Cooper [Tue, 31 May 2016 18:12:32 +0000 (19:12 +0100)]
sfc: Track RPS flow IDs per channel instead of per function

Otherwise we get confused when two flows on different channels get the
 same flow ID.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agousbnet: smsc95xx: fix link detection for disabled autonegotiation
Christoph Fritz [Thu, 26 May 2016 02:06:47 +0000 (04:06 +0200)]
usbnet: smsc95xx: fix link detection for disabled autonegotiation

To detect link status up/down for connections where autonegotiation is
explicitly disabled, we don't get an irq but need to poll the status
register for link up/down detection.
This patch adds a workqueue to poll for link status.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agovirtio_net: fix virtnet_open and virtnet_probe competing for try_fill_recv
wangyunjian [Tue, 31 May 2016 03:52:43 +0000 (11:52 +0800)]
virtio_net: fix virtnet_open and virtnet_probe competing for try_fill_recv

In function virtnet_open() and virtnet_probe(), func try_fill_recv() may
be executed at the same time. VQ in virtqueue_add() has not been protected
well and BUG_ON will be triggered when virito_net.ko being removed.

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agobnx2x: avoid leaking memory on bnx2x_init_one() failures
Vitaly Kuznetsov [Mon, 30 May 2016 13:00:54 +0000 (15:00 +0200)]
bnx2x: avoid leaking memory on bnx2x_init_one() failures

bnx2x_init_bp() allocates memory with bnx2x_alloc_mem_bp() so if we
fail later in bnx2x_init_one() we need to free this memory
with bnx2x_free_mem_bp() to avoid leakages. E.g. I'm observing memory
leaks reported by kmemleak when a failure (unrelated) happens in
bnx2x_vfpf_acquire().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agofou: fix IPv6 Kconfig options
Arnd Bergmann [Tue, 31 May 2016 20:42:11 +0000 (22:42 +0200)]
fou: fix IPv6 Kconfig options

The Kconfig options I added to work around broken compilation ended
up screwing up things more, as I used the wrong symbol to control
compilation of the file, resulting in IPv6 fou support to never be built
into the kernel.

Changing CONFIG_NET_FOU_IPV6_TUNNELS to CONFIG_IPV6_FOU fixes that
problem, I had renamed the symbol in one location but not the other,
and as the file is never being used by other kernel code, this did not
lead to a build failure that I would have caught.

After that fix, another issue with the same patch becomes obvious, as we
'select INET6_TUNNEL', which is related to IPV6_TUNNEL, but not the same,
and this can still cause the original build failure when IPV6_TUNNEL is
not built-in but IPV6_FOU is. The fix is equally trivial, we just need
to select the right symbol.

I have successfully build 350 randconfig kernels with this patch
and verified that the driver is now being built.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Valentin Rothberg <valentinrothberg@gmail.com>
Fixes: fabb13db448e ("fou: add Kconfig options for IPv6 support")
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoopenvswitch: update checksum in {push,pop}_mpls
Simon Horman [Mon, 30 May 2016 05:04:25 +0000 (14:04 +0900)]
openvswitch: update checksum in {push,pop}_mpls

In the case of CHECKSUM_COMPLETE the skb checksum should be updated in
{push,pop}_mpls() as they the type in the ethernet header.

As suggested by Pravin Shelar.

Cc: Pravin Shelar <pshelar@nicira.com>
Fixes: 25cd9ba0abc0 ("openvswitch: Add basic MPLS support to kernel")
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agosctp: sctp_diag should dump sctp socket type
Xin Long [Sun, 29 May 2016 09:42:13 +0000 (17:42 +0800)]
sctp: sctp_diag should dump sctp socket type

Now we cannot distinguish that one sk is a udp or sctp style when
we use ss to dump sctp_info. it's necessary to dump it as well.

For sctp_diag, ss support is not officially available, thus there
are no official users of this yet, so we can add this field in the
middle of sctp_info without breaking user API.

v1->v2:
  - move 'sctpi_s_type' field to the end of struct sctp_info, so
    that it won't cause incompatibility with applications already
    built.
  - add __reserved3 in sctp_info to make sure sctp_info is 8-byte
    alignment.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: fec: update dirty_tx even if no skb
Troy Kisky [Fri, 27 May 2016 20:30:40 +0000 (13:30 -0700)]
net: fec: update dirty_tx even if no skb

If dirty_tx isn't updated, then dma_unmap_single
can be called twice.

This fixes a
[   58.420980] ------------[ cut here ]------------
[   58.425667] WARNING: CPU: 0 PID: 377 at /home/schurig/d/mkarm/linux-4.5/lib/dma-debug.c:1096 check_unmap+0x9d0/0xab8()
[   58.436405] fec 2188000.ethernet: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x0000000000000000] [size=66 bytes]

encountered by Holger

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Tested-by: <holgerschurig@gmail.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agovlan: Propagate MAC address to VLANs
Mike Manning [Fri, 27 May 2016 16:45:07 +0000 (17:45 +0100)]
vlan: Propagate MAC address to VLANs

The MAC address of the physical interface is only copied to the VLAN
when it is first created, resulting in an inconsistency after MAC
address changes of only newly created VLANs having an up-to-date MAC.

The VLANs should continue inheriting the MAC address of the physical
interface until the VLAN MAC address is explicitly set to any value.
This allows IPv6 EUI64 addresses for the VLAN to reflect any changes
to the MAC of the physical interface and thus for DAD to behave as
expected.

Signed-off-by: Mike Manning <mmanning@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoatm: iphase: off by one in rx_pkt()
Dan Carpenter [Fri, 27 May 2016 10:34:35 +0000 (13:34 +0300)]
atm: iphase: off by one in rx_pkt()

The iadev->rx_open[] array holds "iadev->num_vc" pointers (this code
assumes that pointers are 32 bits).  So the > here should be >= or else
we could end up reading a garbage pointer from one element beyond the
end of the array.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoatm: firestream: add more reserved strings
Dan Carpenter [Fri, 27 May 2016 10:33:50 +0000 (13:33 +0300)]
atm: firestream: add more reserved strings

This bug was there when the driver was first added in back in year 2000.
It causes a Smatch warning:

    drivers/atm/firestream.c:849 process_incoming()
    error: buffer overflow 'res_strings' 60 <= 63

There are supposed to be 64 entries in this array and the missing
strings are clearly in the 30 40 range.  I added them as reserved 37 to
reserved 40.  It's possible that strings are really supposed to be added
in the middle instead of at the end, but this approach is safe, in that
it fixes the bug and doesn't break anything that wasn't already broken.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agovxlan: Accept user specified MTU value when create new vxlan link
Chen Haiquan [Fri, 27 May 2016 02:49:11 +0000 (10:49 +0800)]
vxlan: Accept user specified MTU value when create new vxlan link

When create a new vxlan link, example:
  ip link add vtap mtu 1440 type vxlan vni 1 dev eth0

The argument "mtu" has no effect, because it is not set to conf->mtu. The
default value is used in vxlan_dev_configure function.

This problem was introduced by commit 0dfbdf4102b9 (vxlan: Factor out device
configuration).

Fixes: 0dfbdf4102b9 (vxlan: Factor out device configuration)
Signed-off-by: Chen Haiquan <oc@yunify.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: pktgen: Call destroy_hrtimer_on_stack()
Guenter Roeck [Fri, 27 May 2016 00:21:06 +0000 (17:21 -0700)]
net: pktgen: Call destroy_hrtimer_on_stack()

If CONFIG_DEBUG_OBJECTS_TIMERS=y, hrtimer_init_on_stack() requires
a matching call to destroy_hrtimer_on_stack() to clean up timer
debug objects.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agotimer: Export destroy_hrtimer_on_stack()
Guenter Roeck [Fri, 27 May 2016 00:21:05 +0000 (17:21 -0700)]
timer: Export destroy_hrtimer_on_stack()

hrtimer_init_on_stack() needs a matching call to
destroy_hrtimer_on_stack(), so both need to be exported.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agodma-buf: use vma_pages()
Muhammad Falak R Wani [Mon, 23 May 2016 11:38:42 +0000 (17:08 +0530)]
dma-buf: use vma_pages()

Replace explicit computation of vma page count by a call to
vma_pages().
Also, include <linux/mm.h>

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
8 years agofence: add missing descriptions for fence
Luis de Bethencourt [Mon, 11 Apr 2016 11:48:55 +0000 (12:48 +0100)]
fence: add missing descriptions for fence

The members child_list and active_list were added to the fence struct
without descriptions for the Documentation. Adding these.

Fixes: b55b54b5db33 ("staging/android: remove struct sync_pt")
Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
8 years agodoc: update/fixup dma-buf related DocBook
Rob Clark [Thu, 31 Mar 2016 20:26:52 +0000 (16:26 -0400)]
doc: update/fixup dma-buf related DocBook

Split out dma-buf related parts into their own section, add missing
files, and write a bit of overview about how it all fits together.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Tue, 31 May 2016 16:43:24 +0000 (09:43 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Martin Schwidefsky:
 "Three bugs fixes and an update for the default configuration"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: fix info leak in do_sigsegv
  s390/config: update default configuration
  s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop
  s390/bpf: reduce maximum program size to 64 KB

8 years agoreservation: add headerdoc comments
Rob Clark [Thu, 31 Mar 2016 20:26:51 +0000 (16:26 -0400)]
reservation: add headerdoc comments

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
8 years agodma-buf: headerdoc fixes
Rob Clark [Thu, 31 Mar 2016 20:26:50 +0000 (16:26 -0400)]
dma-buf: headerdoc fixes

Apparently nobody noticed that dma-buf.h wasn't actually pulled into
docbook build.  And as a result the headerdoc comments bitrot a bit.
Add missing params/fields.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
8 years agoMerge tag 'gpio-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
Linus Torvalds [Tue, 31 May 2016 16:27:00 +0000 (09:27 -0700)]
Merge tag 'gpio-v4.7-2' of git://git./linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "A bunch of GPIO fixes for the v4.7 series:

   - Drop the lock before reading out the GPIO direction setting in
     drivers supporting the .get_direction() callback: some of them may
     be slowpath.

   - Flush GPIO direction setting before locking a GPIO as an IRQ: some
     electronics or other poking around in the registers behind our back
     may have happened, so flush the direction status before trying to
     lock the line for use by IRQs.

   - Bail out silently when asked to perform operations on NULL GPIO
     descriptors.  That is what all the get_*_optional() is about: we
     get optional GPIO handles, if they are not there, we get NULL.

   - Handle compatible ioctl() correctly: we need to convert the ioctl()
     pointer using compat_ptr() here like everyone else.

   - Disable the broken .to_irq() on the LPC32xx platform.  The whole
     irqchip infrastructure was replaced in the last merge window, and a
     new implementation will be needed"

* tag 'gpio-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: drop lock before reading GPIO direction
  gpio: bail out silently on NULL descriptors
  gpio: handle compatible ioctl() pointers
  gpio: flush direction status in gpiochip_lock_as_irq()
  gpio: lpc32xx: disable broken to_irq support

8 years agoarm64: KVM: vgic-v3: Relax synchronization when SRE==1
Marc Zyngier [Wed, 25 May 2016 14:26:39 +0000 (15:26 +0100)]
arm64: KVM: vgic-v3: Relax synchronization when SRE==1

The GICv3 backend of the vgic is quite barrier heavy, in order
to ensure synchronization of the system registers and the
memory mapped view for a potential GICv2 guest.

But when the guest is using a GICv3 model, there is absolutely
no need to execute all these heavy barriers, and it is actually
beneficial to avoid them altogether.

This patch makes the synchonization conditional, and ensures
that we do not change the EL1 SRE settings if we do not need to.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoarm64: KVM: vgic-v3: Prevent the guest from messing with ICC_SRE_EL1
Marc Zyngier [Wed, 25 May 2016 14:26:38 +0000 (15:26 +0100)]
arm64: KVM: vgic-v3: Prevent the guest from messing with ICC_SRE_EL1

Both our GIC emulations are "strict", in the sense that we either
emulate a GICv2 or a GICv3, and not a GICv3 with GICv2 legacy
support.

But when running on a GICv3 host, we still allow the guest to
tinker with the ICC_SRE_EL1 register during its time slice:
it can switch SRE off, observe that it is off, and yet on the
next world switch, find the SRE bit to be set again. Not very
nice.

An obvious solution is to always trap accesses to ICC_SRE_EL1
(by clearing ICC_SRE_EL2.Enable), and to let the handler return
the programmed value on a read, or ignore the write.

That way, the guest can always observe that our GICv3 is SRE==1
only.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoarm64: KVM: Make ICC_SRE_EL1 access return the configured SRE value
Marc Zyngier [Wed, 25 May 2016 14:26:37 +0000 (15:26 +0100)]
arm64: KVM: Make ICC_SRE_EL1 access return the configured SRE value

When we trap ICC_SRE_EL1, we handle it as RAZ/WI. It would be
more correct to actual make it RO, and return the configured
value when read.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoKVM: arm/arm64: vgic-v3: Always resample level interrupts
Marc Zyngier [Wed, 25 May 2016 14:26:36 +0000 (15:26 +0100)]
KVM: arm/arm64: vgic-v3: Always resample level interrupts

When reading back from the list registers, we need to perform
two actions for level interrupts:
1) clear the soft-pending bit if the interrupt is not pending
   anymore *in the list register*
2) resample the line level and propagate it to the pending state

But these two actions shouldn't be linked, and we should *always*
resample the line level, no matter what state is in the list
register. Otherwise, we may end-up injecting spurious interrupts
that have been already retired.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoKVM: arm/arm64: vgic-v2: Always resample level interrupts
Marc Zyngier [Wed, 25 May 2016 14:26:35 +0000 (15:26 +0100)]
KVM: arm/arm64: vgic-v2: Always resample level interrupts

When reading back from the list registers, we need to perform
two actions for level interrupts:
1) clear the soft-pending bit if the interrupt is not pending
   anymore *in the list register*
2) resample the line level and propagate it to the pending state

But these two actions shouldn't be linked, and we should *always*
resample the line level, no matter what state is in the list
register. Otherwise, we may end-up injecting spurious interrupts
that have been already retired.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
8 years agoKVM: arm/arm64: vgic-v3: Clear all dirty LRs
Christoffer Dall [Wed, 25 May 2016 14:26:34 +0000 (15:26 +0100)]
KVM: arm/arm64: vgic-v3: Clear all dirty LRs

When saving the state of the list registers, it is critical to
reset them zero, as we could otherwise leave unexpected EOI
interrupts pending for virtual level interrupts.

Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agoKVM: arm/arm64: vgic-v2: Clear all dirty LRs
Christoffer Dall [Wed, 25 May 2016 14:26:33 +0000 (15:26 +0100)]
KVM: arm/arm64: vgic-v2: Clear all dirty LRs

When saving the state of the list registers, it is critical to
reset them zero, as we could otherwise leave unexpected EOI
interrupts pending for virtual level interrupts.

Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agopinctrl: mediatek: fix dual-edge code defect
hongkun.cao [Sat, 21 May 2016 07:23:39 +0000 (15:23 +0800)]
pinctrl: mediatek: fix dual-edge code defect

When a dual-edge irq is triggered, an incorrect irq will be reported on
condition that the external signal is not stable and this incorrect irq
has been registered.
Correct the register offset.

Cc: stable@vger.kernel.org
Signed-off-by: Hongkun Cao <hongkun.cao@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agoMerge branch 'uuid' (lib/uuid fixes from Andy)
Linus Torvalds [Mon, 30 May 2016 22:27:07 +0000 (15:27 -0700)]
Merge branch 'uuid' (lib/uuid fixes from Andy)

Merge lib/uuid fixes from Andy Shevchenko.

* emailed patches from Andy Shevchenko <andriy.shevchenko@linux.intel.com>:
  lib/uuid.c: use correct offset in uuid parser
  lib/uuid: add a test module

8 years agolib/uuid.c: use correct offset in uuid parser
Bjørn Mork [Mon, 30 May 2016 14:40:42 +0000 (17:40 +0300)]
lib/uuid.c: use correct offset in uuid parser

Use '+ 0' and '+ 1' as offsets, like they were intended, instead of
adding to the result.

Fixes: 2b1b0d66704a ("lib/uuid.c: introduce a few more generic helpers")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agolib/uuid: add a test module
Andy Shevchenko [Mon, 30 May 2016 14:40:41 +0000 (17:40 +0300)]
lib/uuid: add a test module

It appears that somehow I missed a test of the latest UUID rework which
landed in the kernel.  Present a small test module to avoid such cases
in the future.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoMerge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Linus Torvalds [Mon, 30 May 2016 22:20:18 +0000 (15:20 -0700)]
Merge branch 'linus' of git://git./linux/kernel/git/herbert/crypto-2.6

Pull crypto fixes from Herbert Xu:
 "This fixes the following issues:

   - missing selection in public_key that may result in a build failure

   - Potential crash in error path in omap-sham

   - ccp AES XTS bug that affects requests larger than 4096"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: ccp - Fix AES XTS error for request sizes above 4096
  crypto: public_key: select CRYPTO_AKCIPHER
  crypto: omap-sham - potential Oops on error in probe

8 years agogpio: drop lock before reading GPIO direction
Linus Walleij [Mon, 30 May 2016 15:11:59 +0000 (17:11 +0200)]
gpio: drop lock before reading GPIO direction

When adding the gpiochip, the GPIO HW drivers' callback get_direction()
could get called in atomic context. Some of the GPIO HW drivers may
sleep when accessing the register.

Move the lock before initializing the descriptors.

Reported-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agogpio: bail out silently on NULL descriptors
Linus Walleij [Mon, 30 May 2016 14:48:39 +0000 (16:48 +0200)]
gpio: bail out silently on NULL descriptors

In fdeb8e1547cb9dd39d5d7223b33f3565cf86c28e
("gpio: reflect base and ngpio into gpio_device")
assumed that GPIO descriptors are either valid or error
pointers, but gpiod_get_[index_]optional() actually return
NULL descriptors and then all subsequent calls should just
bail out.

Cc: stable@vger.kernel.org
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Fixes: fdeb8e1547cb ("gpio: reflect base and ngpio into gpio_device")
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agogpio: handle compatible ioctl() pointers
Linus Walleij [Fri, 27 May 2016 12:24:04 +0000 (14:24 +0200)]
gpio: handle compatible ioctl() pointers

If we're using the compatible ioctl() we need to handle the
argument pointer in a special way or there will be trouble.

Fixes: 3c702e9987e2 ("gpio: add a userspace chardev ABI for GPIOs")
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agoMAINTAINERS: Add file patterns for pinctrl device tree bindings
Geert Uytterhoeven [Sun, 22 May 2016 09:06:13 +0000 (11:06 +0200)]
MAINTAINERS: Add file patterns for pinctrl device tree bindings

Submitters of device tree binding documentation may forget to CC
the subsystem maintainer if this is missing.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agopinctrl: nomadik: fix inversion of gpio direction
Linus Walleij [Tue, 24 May 2016 12:39:47 +0000 (14:39 +0200)]
pinctrl: nomadik: fix inversion of gpio direction

The input/output directions were inversed on the GPIO direction
read function. Loose a ! and it is correct.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agogpio: flush direction status in gpiochip_lock_as_irq()
Linus Walleij [Wed, 25 May 2016 08:56:03 +0000 (10:56 +0200)]
gpio: flush direction status in gpiochip_lock_as_irq()

As irqchip and gpiochip functions are orthogonal, the IRQ
set-up or something else can have changed the direction of
the GPIO line from what the GPIO descriptor knows when we
get into gpiochip_lock_as_irq(). Make sure to re-read the
direction setting if we have the .get_direction() callback
enabled for the chip.

Else we get problems like this:

iio iio:device2: interrupts on the rising edge
gpio gpiochip2: (8012e080.gpio): gpiochip_lock_as_irq:
  tried to flag a GPIO set as output for IRQ
gpio gpiochip2: (8012e080.gpio): unable to lock HW IRQ 0 for IRQ
genirq: Failed to request resources for l3g4200d-trigger
  (irq 111) on irqchip nmk1-32-63
iio iio:device2: failed to request trigger IRQ.
st-gyro-i2c: probe of 2-0068 failed with error -22

Fixes: 72d320006177 ("gpio: set up initial state from .get_direction()")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agogpio: lpc32xx: disable broken to_irq support
Sylvain Lemieux [Wed, 11 May 2016 17:40:00 +0000 (13:40 -0400)]
gpio: lpc32xx: disable broken to_irq support

The "to_irq" functionality is broken inside this driver since commit
76ba59f8366f ("genirq: Add irq_domain-aware core IRQ handler").

The addition of the new lpc32xx irqchip driver in 4.7, fixed the
lpc32xx platform interrupt issue.

When switching to the new lpc32xx irqchip driver, a warning appear
in the lpc32xx gpio driver: warning: "NR_IRQS" redefined.

To remove this warning (temporary solution), this patch
disables the broken "to_irq" mapping functionality support.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
8 years agonet: l2tp: Make l2tp_ip6 namespace aware
Shmulik Ladkani [Thu, 26 May 2016 17:16:36 +0000 (20:16 +0300)]
net: l2tp: Make l2tp_ip6 namespace aware

l2tp_ip6 tunnel and session lookups were still using init_net, although
the l2tp core infrastructure already supports lookups keyed by 'net'.

As a result, l2tp_ip6_recv discarded packets for tunnels/sessions
created in namespaces other than the init_net.

Fix, by using dev_net(skb->dev) or sock_net(sk) where appropriate.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoDocumentation: ip-sysctl.txt: clarify secure_redirects
Eric Garver [Thu, 26 May 2016 16:28:05 +0000 (12:28 -0400)]
Documentation: ip-sysctl.txt: clarify secure_redirects

Clarify how secure_redirects works. Mention that RFC1122 always applies.

Signed-off-by: Eric Garver <e@erig.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agosfc: use flow dissector helpers for aRFS
Edward Cree [Thu, 26 May 2016 20:46:05 +0000 (21:46 +0100)]
sfc: use flow dissector helpers for aRFS

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoieee802154: fix logic error in ieee802154_llsec_parse_dev_addr
Baozeng Ding [Thu, 26 May 2016 13:07:42 +0000 (21:07 +0800)]
ieee802154: fix logic error in ieee802154_llsec_parse_dev_addr

Fix a logic error to avoid potential null pointer dereference.

Signed-off-by: Baozeng Ding <sploving1@gmail.com>
Reviewed-by: Stefan Schmidt<stefan@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: nps_enet: Disable interrupts before napi reschedule
Elad Kanfi [Thu, 26 May 2016 12:00:06 +0000 (15:00 +0300)]
net: nps_enet: Disable interrupts before napi reschedule

Since NAPI works by shutting down event interrupts when theres
work and turning them on when theres none, the net driver must
make sure that interrupts are disabled when it reschedules polling.
By calling napi_reschedule, the driver switches to polling mode,
therefor there should be no interrupt interference.
Any received packets will be handled in nps_enet_poll by polling the HW
indication of received packet until all packets are handled.

Signed-off-by: Elad Kanfi <eladkan@mellanox.com>
Acked-by: Noam Camus <noamca@mellanox.com>
Tested-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/lapb: tuse %*ph to dump buffers
Andy Shevchenko [Thu, 26 May 2016 11:43:52 +0000 (14:43 +0300)]
net/lapb: tuse %*ph to dump buffers

Use %*ph specifier to dump small buffers in hex format instead doing this
byte-by-byte.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoptp: oops in ptp_ioctl()
Dan Carpenter [Thu, 26 May 2016 06:46:22 +0000 (09:46 +0300)]
ptp: oops in ptp_ioctl()

If we pass ERR_PTR(-EFAULT) to kfree() then it's going to oops.

Fixes: 2ece068e1b1d ('ptp: use memdup_user().')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agofou: add Kconfig options for IPv6 support
Arnd Bergmann [Wed, 25 May 2016 14:50:46 +0000 (16:50 +0200)]
fou: add Kconfig options for IPv6 support

A previous patch added the fou6.ko module, but that failed to link
in a couple of configurations:

net/built-in.o: In function `ip6_tnl_encap_add_fou_ops':
net/ipv6/fou6.c:88: undefined reference to `ip6_tnl_encap_add_ops'
net/ipv6/fou6.c:94: undefined reference to `ip6_tnl_encap_add_ops'
net/ipv6/fou6.c:97: undefined reference to `ip6_tnl_encap_del_ops'
net/built-in.o: In function `ip6_tnl_encap_del_fou_ops':
net/ipv6/fou6.c:106: undefined reference to `ip6_tnl_encap_del_ops'
net/ipv6/fou6.c:107: undefined reference to `ip6_tnl_encap_del_ops'

If CONFIG_IPV6=m, ip6_tnl_encap_add_ops/ip6_tnl_encap_del_ops
are in a module, but fou6.c can still be built-in, and that
obviously fails to link.

Also, if CONFIG_IPV6=y, but CONFIG_IPV6_TUNNEL=m or
CONFIG_IPV6_TUNNEL=n, the same problem happens for a different
reason.

This adds two new silent Kconfig symbols to work around both
problems:

- CONFIG_IPV6_FOU is now always set to 'm' if either CONFIG_NET_FOU=m
  or CONFIG_IPV6=m
- CONFIG_IPV6_FOU_TUNNEL is set implicitly when IPV6_FOU is enabled
  and NET_FOU_IP_TUNNELS is also turned out, and it will ensure
  that CONFIG_IPV6_TUNNEL is also available.

The options could be made user-visible as well, to give additional
room for configuration, but it seems easier not to bother users
with more choice here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: aa3463d65e7b ("fou: Add encap ops for IPv6 tunnels")
Signed-off-by: David S. Miller <davem@davemloft.net>