GitHub/LineageOS/android_kernel_motorola_exynos9610.git
9 years agoKVM: MMU: Add mmu help functions to support PML
Kai Huang [Wed, 28 Jan 2015 02:54:24 +0000 (10:54 +0800)]
KVM: MMU: Add mmu help functions to support PML

This patch adds new mmu layer functions to clear/set D-bit for memory slot, and
to write protect superpages for memory slot.

In case of PML, CPU logs the dirty GPA automatically to PML buffer when CPU
updates D-bit from 0 to 1, therefore we don't have to write protect 4K pages,
instead, we only need to clear D-bit in order to log that GPA.

For superpages, we still write protect it and let page fault code to handle
dirty page logging, as we still need to split superpage to 4K pages in PML.

As PML is always enabled during guest's lifetime, to eliminate unnecessary PML
GPA logging, we set D-bit manually for the slot with dirty logging disabled.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: Rename kvm_arch_mmu_write_protect_pt_masked to be more generic for log dirty
Kai Huang [Wed, 28 Jan 2015 02:54:23 +0000 (10:54 +0800)]
KVM: Rename kvm_arch_mmu_write_protect_pt_masked to be more generic for log dirty

We don't have to write protect guest memory for dirty logging if architecture
supports hardware dirty logging, such as PML on VMX, so rename it to be more
generic.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agokvm: update_memslots: clean flags for invalid memslots
Tiejun Chen [Fri, 9 Jan 2015 08:29:14 +0000 (16:29 +0800)]
kvm: update_memslots: clean flags for invalid memslots

Indeed, any invalid memslots should be new->npages = 0,
new->base_gfn = 0 and new->flags = 0 at the same time.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agokvm: iommu: Add cond_resched to legacy device assignment code
Joerg Roedel [Tue, 27 Jan 2015 10:57:19 +0000 (11:57 +0100)]
kvm: iommu: Add cond_resched to legacy device assignment code

When assigning devices to large memory guests (>=128GB guest
memory in the failure case) the functions to create the
IOMMU page-tables for the whole guest might run for a very
long time. On non-preemptible kernels this might cause
Soft-Lockup warnings. Fix these by adding a cond_resched()
to the mapping and unmapping loops.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Emulation of call may use incorrect stack size
Nadav Amit [Mon, 26 Jan 2015 07:32:27 +0000 (09:32 +0200)]
KVM: x86: Emulation of call may use incorrect stack size

On long-mode, when far call that changes cs.l takes place, the stack size is
determined by the new mode.  For instance, if we go from 32-bit mode to 64-bit
mode, the stack-size if 64.  KVM uses the old stack size.

Fix it.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: 32-bit wraparound read/write not emulated correctly
Nadav Amit [Mon, 26 Jan 2015 07:32:26 +0000 (09:32 +0200)]
KVM: x86: 32-bit wraparound read/write not emulated correctly

If we got a wraparound of 32-bit operand, and the limit is 0xffffffff, read and
writes should be successful. It just needs to be done in two segments.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Fix defines in emulator.c
Nadav Amit [Mon, 26 Jan 2015 07:32:25 +0000 (09:32 +0200)]
KVM: x86: Fix defines in emulator.c

Unnecassary define was left after commit 7d882ffa81d5 ("KVM: x86: Revert
NoBigReal patch in the emulator").

Commit 39f062ff51b2 ("KVM: x86: Generate #UD when memory operand is required")
was missing undef.

Fix it.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: ARPL emulation can cause spurious exceptions
Nadav Amit [Mon, 26 Jan 2015 07:32:24 +0000 (09:32 +0200)]
KVM: x86: ARPL emulation can cause spurious exceptions

ARPL and MOVSXD are encoded the same and their execution depends on the
execution mode.  The operand sizes of each instruction are different.
Currently, ARPL is detected too late, after the decoding was already done, and
therefore may result in spurious exception (instead of failed emulation).

Introduce a group to the emulator to handle instructions according to execution
mode (32/64 bits). Note: in order not to make changes that may affect
performance, the new ModeDual can only be applied to instructions with ModRM.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: IRET emulation does not clear NMI masking
Nadav Amit [Mon, 26 Jan 2015 07:32:23 +0000 (09:32 +0200)]
KVM: x86: IRET emulation does not clear NMI masking

The IRET instruction should clear NMI masking, but the current implementation
does not do so.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Wrong operand size for far ret
Nadav Amit [Mon, 26 Jan 2015 07:32:22 +0000 (09:32 +0200)]
KVM: x86: Wrong operand size for far ret

Indeed, Intel SDM specifically states that for the RET instruction "In 64-bit
mode, the default operation size of this instruction is the stack-address size,
i.e. 64 bits."

However, experiments show this is not the case. Here is for example objdump of
small 64-bit asm:

  4004f1: ca 14 00              lret   $0x14
  4004f4: 48 cb                 lretq
  4004f6: 48 ca 14 00           lretq  $0x14

Therefore, remove the Stack flag from far-ret instructions.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Dirty the dest op page on cmpxchg emulation
Nadav Amit [Mon, 26 Jan 2015 07:32:21 +0000 (09:32 +0200)]
KVM: x86: Dirty the dest op page on cmpxchg emulation

Intel SDM says for CMPXCHG: "To simplify the interface to the processor’s bus,
the destination operand receives a write cycle without regard to the result of
the comparison.". This means the destination page should be dirtied.

Fix it to by writing back the original value if cmpxchg failed.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoMerge tag 'kvm-s390-next-20150122' of git://git.kernel.org/pub/scm/linux/kernel/git...
Paolo Bonzini [Fri, 23 Jan 2015 13:33:36 +0000 (14:33 +0100)]
Merge tag 'kvm-s390-next-20150122' of git://git./linux/kernel/git/kvms390/linux into kvm-next

KVM: s390: fixes and features for kvm/next (3.20)

1. Generic
- sparse warning (make function static)
- optimize locking
- bugfixes for interrupt injection
- fix MVPG addressing modes

2. hrtimer/wakeup fun
A recent change can cause KVM hangs if adjtime is used in the host.
The hrtimer might wake up too early or too late. Too early is fatal
as vcpu_block will see that the wakeup condition is not met and
sleep again. This CPU might never wake up again.
This series addresses this problem. adjclock slowing down the host
clock will result in too late wakeups. This will require more work.
In addition to that we also change the hrtimer from REALTIME to
MONOTONIC to avoid similar problems with timedatectl set-time.

3. sigp rework
We will move all "slow" sigps to QEMU (protected with a capability that
can be enabled) to avoid several races between concurrent SIGP orders.

4. Optimize the shadow page table
Provide an interface to announce the maximum guest size. The kernel
will use that to make the pagetable 2,3,4 (or theoretically) 5 levels.

5. Provide an interface to set the guest TOD
We now use two vm attributes instead of two oneregs, as oneregs are
vcpu ioctl and we don't want to call them from other threads.

6. Protected key functions
The real HMC allows to enable/disable protected key CPACF functions.
Lets provide an implementation + an interface for QEMU to activate
this the protected key instructions.

9 years agoMerge tag 'kvm-arm-for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm...
Paolo Bonzini [Fri, 23 Jan 2015 12:39:51 +0000 (13:39 +0100)]
Merge tag 'kvm-arm-for-3.20' of git://git./linux/kernel/git/kvmarm/kvmarm into kvm-next

KVM/ARM changes for v3.20 including GICv3 emulation, dirty page logging, added
trace symbols, and adding an explicit VGIC init device control IOCTL.

Conflicts:
arch/arm64/include/asm/kvm_arm.h
arch/arm64/kvm/handle_exit.c

9 years agoKVM: s390: remove redundant setting of interrupt type
Jens Freimann [Wed, 14 Jan 2015 14:16:57 +0000 (15:16 +0100)]
KVM: s390: remove redundant setting of interrupt type

Setting inti->type again is unnecessary here, so let's
remove this.

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: fix bug in interrupt parameter check
Jens Freimann [Thu, 15 Jan 2015 13:40:34 +0000 (14:40 +0100)]
KVM: s390: fix bug in interrupt parameter check

When we convert interrupt data from struct kvm_s390_interrupt to
struct kvm_s390_irq we need to check the data in the input parameter
not the output parameter.

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: avoid memory leaks if __inject_vm() fails
David Hildenbrand [Fri, 16 Jan 2015 11:58:09 +0000 (12:58 +0100)]
KVM: s390: avoid memory leaks if __inject_vm() fails

We have to delete the allocated interrupt info if __inject_vm() fails.

Otherwise user space can keep flooding kvm with floating interrupts and
provoke more and more memory leaks.

Reported-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390/cpacf: Enable/disable protected key functions for kvm guest
Tony Krowiak [Wed, 3 Sep 2014 08:13:53 +0000 (10:13 +0200)]
KVM: s390/cpacf: Enable/disable protected key functions for kvm guest

Created new KVM device attributes for indicating whether the AES and
DES/TDES protected key functions are available for programs running
on the KVM guest.  The attributes are used to set up the controls in
the guest SIE block that specify whether programs running on the
guest will be given access to the protected key functions available
on the s390 hardware.

Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[split MSA4/protected key into two patches]

9 years agoKVM: s390: Provide guest TOD Clock Get/Set Controls
Jason J. Herne [Tue, 25 Nov 2014 14:46:02 +0000 (09:46 -0500)]
KVM: s390: Provide guest TOD Clock Get/Set Controls

Provide controls for setting/getting the guest TOD clock based on the VM
attribute interface.

Provide TOD and TOD_HIGH vm attributes on s390 for managing guest Time Of
Day clock value.

TOD_HIGH is presently always set to 0. In the future it will contain a high
order expansion of the tod clock value after it overflows the 64-bits of
the TOD.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: trace correct values for set prefix and machine checks
Jens Freimann [Thu, 18 Dec 2014 14:52:21 +0000 (15:52 +0100)]
KVM: s390: trace correct values for set prefix and machine checks

When injecting SIGP set prefix or a machine check, we trace
the values in our per-vcpu local_int data structure instead
of the parameters passed to the function.

Fix this by changing the trace statement to use the correct values.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: fix bug in sigp emergency signal injection
Jens Freimann [Thu, 18 Dec 2014 14:48:14 +0000 (15:48 +0100)]
KVM: s390: fix bug in sigp emergency signal injection

Currently we are always setting the wrong bit in the
bitmap for pending emergency signals. Instead of using
emerg.code from the passed in irq parameter, we use the
value in our per-vcpu local_int structure, which is always zero.
That means all emergency signals will have address 0 as parameter.
If two CPUs send a SIGP to the same target, one might be lost.

Let's fix this by using the value from the parameter and
also trace the correct value.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: Take addressing mode into account for MVPG interception
Thomas Huth [Wed, 7 Jan 2015 15:27:02 +0000 (16:27 +0100)]
KVM: s390: Take addressing mode into account for MVPG interception

The handler for MVPG partial execution interception does not take
the current CPU addressing mode into account yet, so addresses are
always treated as 64-bit addresses. For correct behaviour, we should
properly handle 24-bit and 31-bit addresses, too.

Since MVPG is defined to work with logical addresses, we can simply
use guest_translate_address() to achieve the required behaviour
(since DAT is disabled here, guest_translate_address() skips the MMU
translation and only translates the address via kvm_s390_logical_to_effective()
and kvm_s390_real_to_abs(), which is exactly what we want here).

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: no need to hold the kvm->mutex for floating interrupts
Christian Borntraeger [Wed, 17 Dec 2014 09:36:04 +0000 (10:36 +0100)]
KVM: s390: no need to hold the kvm->mutex for floating interrupts

The kvm mutex was (probably) used to protect against cpu hotplug.
The current code no longer needs to protect against that, as we only
rely on CPU data structures that are guaranteed to be available
if we can access the CPU. (e.g. vcpu_create will put the cpu
in the array AFTER the cpu is ready).

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
9 years agoKVM: s390: forward most SIGP orders to user space
David Hildenbrand [Thu, 9 Oct 2014 12:10:13 +0000 (14:10 +0200)]
KVM: s390: forward most SIGP orders to user space

Most SIGP orders are handled partially in kernel and partially in
user space. In order to:
- Get a correct SIGP SET PREFIX handler that informs user space
- Avoid race conditions between concurrently executed SIGP orders
- Serialize SIGP orders per VCPU

We need to handle all "slow" SIGP orders in user space. The remaining
ones to be handled completely in kernel are:
- SENSE
- SENSE RUNNING
- EXTERNAL CALL
- EMERGENCY SIGNAL
- CONDITIONAL EMERGENCY SIGNAL
According to the PoP, they have to be fast. They can be executed
without conflicting to the actions of other pending/concurrently
executing orders (e.g. STOP vs. START).

This patch introduces a new capability that will - when enabled -
forward all but the mentioned SIGP orders to user space. The
instruction counters in the kernel are still updated.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: clear the pfault queue if user space sets the invalid token
David Hildenbrand [Thu, 9 Oct 2014 13:01:38 +0000 (15:01 +0200)]
KVM: s390: clear the pfault queue if user space sets the invalid token

We need a way to clear the async pfault queue from user space (e.g.
for resets and SIGP SET ARCHITECTURE).

This patch simply clears the queue as soon as user space sets the
invalid pfault token. The definition of the invalid token is moved
to uapi.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: only one external call may be pending at a time
David Hildenbrand [Tue, 14 Oct 2014 13:29:30 +0000 (15:29 +0200)]
KVM: s390: only one external call may be pending at a time

Only one external call may be pending at a vcpu at a time. For this
reason, we have to detect whether the SIGP externcal call interpretation
facility is available. If so, all external calls have to be injected
using this mechanism.

SIGP EXTERNAL CALL orders have to return whether another external
call is already pending. This check was missing until now.

SIGP SENSE hasn't returned yet in all conditions whether an external
call was pending.

If a SIGP EXTERNAL CALL irq is to be injected and one is already
pending, -EBUSY is returned.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agos390/sclp: introduce check for the SIGP Interpretation Facility
David Hildenbrand [Tue, 14 Oct 2014 10:11:02 +0000 (12:11 +0200)]
s390/sclp: introduce check for the SIGP Interpretation Facility

This patch introduces the infrastructure to check whether the SIGP
Interpretation Facility is installed on all VCPUs in the configuration.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: SIGP SET PREFIX cleanup
David Hildenbrand [Tue, 14 Oct 2014 07:44:55 +0000 (09:44 +0200)]
KVM: s390: SIGP SET PREFIX cleanup

This patch cleanes up the the SIGP SET PREFIX code.

A SIGP SET PREFIX irq may only be injected if the target vcpu is
stopped. Let's move the checking code into the injection code and
return -EBUSY if the target vcpu is not stopped.

Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: a VCPU may only stop when no interrupts are left pending
David Hildenbrand [Tue, 5 Aug 2014 15:40:47 +0000 (17:40 +0200)]
KVM: s390: a VCPU may only stop when no interrupts are left pending

As a SIGP STOP is an interrupt with the least priority, it may only result
in stop of the vcpu when no other interrupts are left pending.

To detect whether a non-stop irq is pending, we need a way to mask out
stop irqs from the general kvm_cpu_has_interrupt() function. For this
reason, the existing function (with an outdated name) is replaced by
kvm_s390_vcpu_has_irq() which allows to mask out pending stop irqs.

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: handle stop irqs without action_bits
David Hildenbrand [Wed, 15 Oct 2014 14:48:53 +0000 (16:48 +0200)]
KVM: s390: handle stop irqs without action_bits

This patch removes the famous action_bits and moves the handling of
SIGP STOP AND STORE STATUS directly into the SIGP STOP interrupt.

The new local interrupt infrastructure is used to track pending stop
requests.

STOP irqs are the only irqs that don't get actively delivered. They
remain pending until the stop function is executed (=stop intercept).

If another STOP irq is already pending, -EBUSY will now be returned
(needed for the SIGP handling code).

Migration of pending SIGP STOP (AND STORE STATUS) orders should now
be supported out of the box.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: new parameter for SIGP STOP irqs
David Hildenbrand [Wed, 15 Oct 2014 14:48:16 +0000 (16:48 +0200)]
KVM: s390: new parameter for SIGP STOP irqs

In order to get rid of the action_flags and to properly migrate pending SIGP
STOP irqs triggered e.g. by SIGP STOP AND STORE STATUS, we need to remember
whether to store the status when stopping.

For this reason, a new parameter (flags) for the SIGP STOP irq is introduced.
These flags further define details of the requested STOP and can be easily
migrated.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: forward hrtimer if guest ckc not pending yet
David Hildenbrand [Thu, 11 Dec 2014 09:18:01 +0000 (10:18 +0100)]
KVM: s390: forward hrtimer if guest ckc not pending yet

Patch 0759d0681cae ("KVM: s390: cleanup handle_wait by reusing
kvm_vcpu_block") changed the way pending guest clock comparator
interrupts are detected. It was assumed that as soon as the hrtimer
wakes up, the condition for the guest ckc is satisfied.

This is however only true as long as adjclock() doesn't speed
up the monotonic clock. Reason is that the hrtimer is based on
CLOCK_MONOTONIC, the guest clock comparator detection is based
on the raw TOD clock. If CLOCK_MONOTONIC runs faster than the
TOD clock, the hrtimer wakes the target VCPU up too early and
the target VCPU will not detect any pending interrupts, therefore
going back to sleep. It will never be woken up again because the
hrtimer has finished. The VCPU is stuck.

As a quick fix, we have to forward the hrtimer until the guest
clock comparator is really due, to guarantee properly timed wake
ups.

As the hrtimer callback might be triggered on another cpu, we
have to make sure that the timer is really stopped and not currently
executing the callback on another cpu. This can happen if the vcpu
thread is scheduled onto another physical cpu, but the timer base
is not migrated. So lets use hrtimer_cancel instead of try_to_cancel.

A proper fix might be to introduce a RAW based hrtimer.

Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: base hrtimer on a monotonic clock
David Hildenbrand [Fri, 12 Dec 2014 14:17:31 +0000 (15:17 +0100)]
KVM: s390: base hrtimer on a monotonic clock

The hrtimer that handles the wait with enabled timer interrupts
should not be disturbed by changes of the host time.

This patch changes our hrtimer to be based on a monotonic clock.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: prevent sleep duration underflows in handle_wait()
David Hildenbrand [Fri, 12 Dec 2014 11:26:40 +0000 (12:26 +0100)]
KVM: s390: prevent sleep duration underflows in handle_wait()

We sometimes get an underflow for the sleep duration, which most
likely won't result in the short sleep time we wanted.

So let's check for sleep duration underflows and directly continue
to run the guest if we get one.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: Allow userspace to limit guest memory size
Dominik Dingel [Fri, 31 Oct 2014 13:10:41 +0000 (14:10 +0100)]
KVM: s390: Allow userspace to limit guest memory size

With commit c6c956b80bdf ("KVM: s390/mm: support gmap page tables with less
than 5 levels") we are able to define a limit for the guest memory size.

As we round up the guest size in respect to the levels of page tables
we get to guest limits of: 2048 MB, 4096 GB, 8192 TB and 16384 PB.
We currently limit the guest size to 16 TB, which means we end up
creating a page table structure supporting guest sizes up to 8192 TB.

This patch introduces an interface that allows userspace to tune
this limit. This may bring performance improvements for small guests.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: move vcpu specific initalization to a later point
Dominik Dingel [Tue, 2 Dec 2014 15:53:21 +0000 (16:53 +0100)]
KVM: s390: move vcpu specific initalization to a later point

As we will allow in a later patch to recreate gmaps with new limits,
we need to make sure that vcpus get their reference for that gmap
after they increased the online_vcpu counter, so there is no possible race.

While we are doing this, we also can simplify the vcpu_init function, by
moving ucontrol specifics to an own function.
That way we also start now setting the kvm_valid_regs for the ucontrol path.

Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: s390: make local function static
Christian Borntraeger [Thu, 15 Jan 2015 11:40:42 +0000 (12:40 +0100)]
KVM: s390: make local function static

sparse rightfully complains about
warning: symbol '__inject_extcall' was not declared. Should it be static?

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoKVM: remove unneeded return value of vcpu_postcreate
Dominik Dingel [Thu, 4 Dec 2014 14:47:07 +0000 (15:47 +0100)]
KVM: remove unneeded return value of vcpu_postcreate

The return value of kvm_arch_vcpu_postcreate is not checked in its
caller.  This is okay, because only x86 provides vcpu_postcreate right
now and it could only fail if vcpu_load failed.  But that is not
possible during KVM_CREATE_VCPU (kvm_arch_vcpu_load is void, too), so
just get rid of the unchecked return value.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
9 years agoMerge branch 'arm64/common-esr-macros' of git://git.kernel.org/pub/scm/linux/kernel...
Paolo Bonzini [Fri, 23 Jan 2015 12:09:15 +0000 (13:09 +0100)]
Merge branch 'arm64/common-esr-macros' of git://git./linux/kernel/git/mark/linux into kvm-next

ESR_ELx definitions clean-up from Mark Rutland.

* 'arm64/common-esr-macros' of git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux:
  arm64: kvm: decode ESR_ELx.EC when reporting exceptions
  arm64: kvm: remove ESR_EL2_* macros
  arm64: remove ESR_EL1_* macros
  arm64: kvm: move to ESR_ELx macros
  arm64: decode ESR_ELx.EC when reporting exceptions
  arm64: move to ESR_ELx macros
  arm64: introduce common ESR_ELx_* definitions

This is required by the patch "arm/arm64: KVM: add tracing support for
arm64 exit handler" in Christoffer's pull request.

9 years agoKVM: Remove unused config symbol
Christoffer Dall [Fri, 23 Jan 2015 09:50:23 +0000 (10:50 +0100)]
KVM: Remove unused config symbol

The dirty patch logging series introduced both
HAVE_KVM_ARCH_DIRTY_LOG_PROTECT and KVM_GENERIC_DIRTYLOG_READ_PROTECT
config symbols, but only KVM_GENERIC_DIRTYLOG_READ_PROTECT is used.
Just remove the unused one.

(The config symbol was renamed during the development of the patch
series and the old name just creeped in by accident.()

Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: Fixup incorrect config symbol in comment
Christoffer Dall [Fri, 23 Jan 2015 09:49:31 +0000 (10:49 +0100)]
arm/arm64: KVM: Fixup incorrect config symbol in comment

A comment in the dirty page logging patch series mentioned incorrectly
spelled config symbols, just fix them up to match the real thing.

Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agokvm: Fix CR3_PCID_INVD type on 32-bit
Borislav Petkov [Thu, 15 Jan 2015 08:44:56 +0000 (09:44 +0100)]
kvm: Fix CR3_PCID_INVD type on 32-bit

arch/x86/kvm/emulate.c: In function ‘check_cr_write’:
arch/x86/kvm/emulate.c:3552:4: warning: left shift count >= width of type
    rsvd = CR3_L_MODE_RESERVED_BITS & ~CR3_PCID_INVD;

happens because sizeof(UL) on 32-bit is 4 bytes but we shift it 63 bits
to the left.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: workaround SuSE's 2.6.16 pvclock vs masterclock issue
Marcelo Tosatti [Tue, 20 Jan 2015 17:54:52 +0000 (15:54 -0200)]
KVM: x86: workaround SuSE's 2.6.16 pvclock vs masterclock issue

SuSE's 2.6.16 kernel fails to boot if the delta between tsc_timestamp
and rdtsc is larger than a given threshold:

 * If we get more than the below threshold into the future, we rerequest
 * the real time from the host again which has only little offset then
 * that we need to adjust using the TSC.
 *
 * For now that threshold is 1/5th of a jiffie. That should be good
 * enough accuracy for completely broken systems, but also give us swing
 * to not call out to the host all the time.
 */
#define PVCLOCK_DELTA_MAX ((1000000000ULL / HZ) / 5)

Disable masterclock support (which increases said delta) in case the
boot vcpu does not use MSR_KVM_SYSTEM_TIME_NEW.

Upstreams kernels which support pvclock vsyscalls (and therefore make
use of PVCLOCK_STABLE_BIT) use MSR_KVM_SYSTEM_TIME_NEW.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: fix "Should it be static?" warnings from sparse
Fengguang Wu [Mon, 19 Jan 2015 14:33:39 +0000 (22:33 +0800)]
KVM: fix "Should it be static?" warnings from sparse

arch/x86/kvm/x86.c:495:5: sparse: symbol 'kvm_read_nested_guest_page' was not declared. Should it be static?
arch/x86/kvm/x86.c:646:5: sparse: symbol '__kvm_set_xcr' was not declared. Should it be static?
arch/x86/kvm/x86.c:1183:15: sparse: symbol 'max_tsc_khz' was not declared. Should it be static?
arch/x86/kvm/x86.c:1237:6: sparse: symbol 'kvm_track_tsc_matching' was not declared. Should it be static?

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoarm/arm64: KVM: force alignment of VGIC dist/CPU/redist addresses
Andre Przywara [Tue, 13 Jan 2015 12:02:13 +0000 (12:02 +0000)]
arm/arm64: KVM: force alignment of VGIC dist/CPU/redist addresses

Although the GIC architecture requires us to map the MMIO regions
only at page aligned addresses, we currently do not enforce this from
the kernel side.
Restrict any vGICv2 regions to be 4K aligned and any GICv3 regions
to be 64K aligned. Document this requirement.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: allow userland to request a virtual GICv3
Andre Przywara [Tue, 3 Jun 2014 08:26:30 +0000 (10:26 +0200)]
arm/arm64: KVM: allow userland to request a virtual GICv3

With all of the GICv3 code in place now we allow userland to ask the
kernel for using a virtual GICv3 in the guest.
Also we provide the necessary support for guests setting the memory
addresses for the virtual distributor and redistributors.
This requires some userland code to make use of that feature and
explicitly ask for a virtual GICv3.
Document that KVM_CREATE_IRQCHIP only works for GICv2, but is
considered legacy and using KVM_CREATE_DEVICE is preferred.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: enable kernel side of GICv3 emulation
Andre Przywara [Tue, 3 Jun 2014 08:26:03 +0000 (10:26 +0200)]
arm/arm64: KVM: enable kernel side of GICv3 emulation

With all the necessary GICv3 emulation code in place, we can now
connect the code to the GICv3 backend in the kernel.
The LR register handling is different depending on the emulated GIC
model, so provide different implementations for each.
Also allow non-v2-compatible GICv3 implementations (which don't
provide MMIO regions for the virtual CPU interface in the DT), but
restrict those hosts to support GICv3 guests only.
If the device tree provides a GICv2 compatible GICV resource entry,
but that one is faulty, just disable the GICv2 emulation and let the
user use at least the GICv3 emulation for guests.
To provide proper support for the legacy KVM_CREATE_IRQCHIP ioctl,
note virtual GICv2 compatibility in struct vgic_params and use it
on creating a VGICv2.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm64: KVM: add SGI generation register emulation
Andre Przywara [Tue, 3 Jun 2014 08:13:13 +0000 (10:13 +0200)]
arm64: KVM: add SGI generation register emulation

While the generation of a (virtual) inter-processor interrupt (SGI)
on a GICv2 works by writing to a MMIO register, GICv3 uses the system
register ICC_SGI1R_EL1 to trigger them.
Add a trap handler function that calls the new SGI register handler
in the GICv3 code. As ICC_SRE_EL1.SRE at this point is still always 0,
this will not trap yet, but will only be used later when all the data
structures have been initialized properly.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields
Andre Przywara [Wed, 12 Nov 2014 13:46:06 +0000 (13:46 +0000)]
arm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields

The gic_send_sgi() function used hardcoded bit shift values to
generate the ICC_SGI1R_EL1 register value.
Replace this with symbolic names to allow reusing them later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: add virtual GICv3 distributor emulation
Andre Przywara [Fri, 6 Jun 2014 22:54:51 +0000 (00:54 +0200)]
arm/arm64: KVM: add virtual GICv3 distributor emulation

With everything separated and prepared, we implement a model of a
GICv3 distributor and redistributors by using the existing framework
to provide handler functions for each register group.

Currently we limit the emulation to a model enforcing a single
security state, with SRE==1 (forcing system register access) and
ARE==1 (allowing more than 8 VCPUs).

We share some of the functions provided for GICv2 emulation, but take
the different ways of addressing (v)CPUs into account.
Save and restore is currently not implemented.

Similar to the split-off of the GICv2 specific code, the new emulation
code goes into a new file (vgic-v3-emul.c).

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: add opaque private pointer to MMIO data
Andre Przywara [Thu, 13 Nov 2014 16:21:35 +0000 (16:21 +0000)]
arm/arm64: KVM: add opaque private pointer to MMIO data

For a GICv2 there is always only one (v)CPU involved: the one that
does the access. On a GICv3 the access to a CPU redistributor is
memory-mapped, but not banked, so the (v)CPU affected is determined by
looking at the MMIO address region being accessed.
To allow passing the affected CPU into the accessors later, extend
struct kvm_exit_mmio to add an opaque private pointer parameter.
The current GICv2 emulation just does not use it.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: split GICv2 specific emulation code from vgic.c
Andre Przywara [Fri, 6 Jun 2014 22:53:08 +0000 (00:53 +0200)]
arm/arm64: KVM: split GICv2 specific emulation code from vgic.c

vgic.c is currently a mixture of generic vGIC emulation code and
functions specific to emulating a GICv2. To ease the addition of
GICv3, split off strictly v2 specific parts into a new file
vgic-v2-emul.c.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
-------
As the diff isn't always obvious here (and to aid eventual rebases),
here is a list of high-level changes done to the code:
* added new file to respective arm/arm64 Makefiles
* moved GICv2 specific functions to vgic-v2-emul.c:
  - handle_mmio_misc()
  - handle_mmio_set_enable_reg()
  - handle_mmio_clear_enable_reg()
  - handle_mmio_set_pending_reg()
  - handle_mmio_clear_pending_reg()
  - handle_mmio_priority_reg()
  - vgic_get_target_reg()
  - vgic_set_target_reg()
  - handle_mmio_target_reg()
  - handle_mmio_cfg_reg()
  - handle_mmio_sgi_reg()
  - vgic_v2_unqueue_sgi()
  - read_set_clear_sgi_pend_reg()
  - write_set_clear_sgi_pend_reg()
  - handle_mmio_sgi_set()
  - handle_mmio_sgi_clear()
  - vgic_v2_handle_mmio()
  - vgic_get_sgi_sources()
  - vgic_dispatch_sgi()
  - vgic_v2_queue_sgi()
  - vgic_v2_map_resources()
  - vgic_v2_init()
  - vgic_v2_add_sgi_source()
  - vgic_v2_init_model()
  - vgic_v2_init_emulation()
  - handle_cpu_mmio_misc()
  - handle_mmio_abpr()
  - handle_cpu_mmio_ident()
  - vgic_attr_regs_access()
  - vgic_create() (renamed to vgic_v2_create())
  - vgic_destroy() (renamed to vgic_v2_destroy())
  - vgic_has_attr() (renamed to vgic_v2_has_attr())
  - vgic_set_attr() (renamed to vgic_v2_set_attr())
  - vgic_get_attr() (renamed to vgic_v2_get_attr())
  - struct kvm_mmio_range vgic_dist_ranges[]
  - struct kvm_mmio_range vgic_cpu_ranges[]
  - struct kvm_device_ops kvm_arm_vgic_v2_ops {}

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: add vgic.h header file
Andre Przywara [Fri, 6 Jun 2014 22:53:08 +0000 (00:53 +0200)]
arm/arm64: KVM: add vgic.h header file

vgic.c is currently a mixture of generic vGIC emulation code and
functions specific to emulating a GICv2. To ease the addition of
GICv3 later, we create new header file vgic.h, which holds constants
and prototypes of commonly used functions.
Rename some identifiers to avoid name space clutter.
I removed the long-standing comment about using the kvm_io_bus API
to tackle the GIC register ranges, as it wouldn't be a win for us
anymore.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
-------
As the diff isn't always obvious here (and to aid eventual rebases),
here is a list of high-level changes done to the code:
* moved definitions and prototypes from vgic.c to vgic.h:
  - VGIC_ADDR_UNDEF
  - ACCESS_{READ,WRITE}_*
  - vgic_init()
  - vgic_update_state()
  - vgic_kick_vcpus()
  - vgic_get_vmcr()
  - vgic_set_vmcr()
  - struct mmio_range {} (renamed to struct kvm_mmio_range)
* removed static keyword and exported prototype in vgic.h:
  - vgic_bitmap_get_reg()
  - vgic_bitmap_set_irq_val()
  - vgic_bitmap_get_shared_map()
  - vgic_bytemap_get_reg()
  - vgic_dist_irq_set_pending()
  - vgic_dist_irq_clear_pending()
  - vgic_cpu_irq_clear()
  - vgic_reg_access()
  - handle_mmio_raz_wi()
  - vgic_handle_enable_reg()
  - vgic_handle_set_pending_reg()
  - vgic_handle_clear_pending_reg()
  - vgic_handle_cfg_reg()
  - vgic_unqueue_irqs()
  - find_matching_range() (renamed to vgic_find_range)
  - vgic_handle_mmio_range()
  - vgic_update_state()
  - vgic_get_vmcr()
  - vgic_set_vmcr()
  - vgic_queue_irq()
  - vgic_kick_vcpus()
  - vgic_init()
  - vgic_v2_init_emulation()
  - vgic_has_attr_regs()
  - vgic_set_common_attr()
  - vgic_get_common_attr()
  - vgic_destroy()
  - vgic_create()
* moved functions to vgic.h (static inline):
  - mmio_data_read()
  - mmio_data_write()
  - is_in_range()

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: refactor/wrap vgic_set/get_attr()
Andre Przywara [Thu, 21 Aug 2014 10:08:27 +0000 (11:08 +0100)]
arm/arm64: KVM: refactor/wrap vgic_set/get_attr()

vgic_set_attr() and vgic_get_attr() contain both code specific for
the emulated GIC as well as code for the userland facing, generic
part of the GIC.
Split the guest GIC facing code of from the generic part to allow
easier splitting later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: refactor MMIO accessors
Andre Przywara [Wed, 11 Jun 2014 12:11:49 +0000 (14:11 +0200)]
arm/arm64: KVM: refactor MMIO accessors

The MMIO accessors for GICD_I[CS]ENABLER, GICD_I[CS]PENDR and
GICD_ICFGR behave very similar for GICv2 and GICv3, although the way
the affected VCPU is determined differs.
Since we need them to access the registers from three different
places in the future, we factor out a generic, backend-facing
implementation and use small wrappers in the current GICv2 emulation.
This will ease adding GICv3 accessors later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable
Andre Przywara [Tue, 3 Jun 2014 06:58:15 +0000 (08:58 +0200)]
arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable

ICC_SRE_EL1 is a system register allowing msr/mrs accesses to the
GIC CPU interface for EL1 (guests). Currently we force it to 0, but
for proper GICv3 support we have to allow guests to use it (depending
on their selected virtual GIC model).
So add ICC_SRE_EL1 to the list of saved/restored registers on a
world switch, but actually disallow a guest to change it by only
restoring a fixed, once-initialized value.
This value depends on the GIC model userland has chosen for a guest.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: make the maximum number of vCPUs a per-VM value
Andre Przywara [Mon, 2 Jun 2014 14:26:01 +0000 (16:26 +0200)]
arm/arm64: KVM: make the maximum number of vCPUs a per-VM value

Currently the maximum number of vCPUs supported is a global value
limited by the used GIC model. GICv3 will lift this limit, but we
still need to observe it for guests using GICv2.
So the maximum number of vCPUs is per-VM value, depending on the
GIC model the guest uses.
Store and check the value in struct kvm_arch, but keep it down to
8 for now.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: dont rely on a valid GICH base address
Andre Przywara [Sun, 26 Oct 2014 23:18:14 +0000 (23:18 +0000)]
arm/arm64: KVM: dont rely on a valid GICH base address

To check whether the vGIC was already initialized, we currently check
the GICH base address for not being NULL. Since with GICv3 we may
get along without this address, lets use the irqchip_in_kernel()
function to detect an already initialized vGIC.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: move kvm_register_device_ops() into vGIC probing
Andre Przywara [Sun, 26 Oct 2014 23:17:00 +0000 (23:17 +0000)]
arm/arm64: KVM: move kvm_register_device_ops() into vGIC probing

Currently we unconditionally register the GICv2 emulation device
during the host's KVM initialization. Since with GICv3 support we
may end up with only v2 or only v3 or both supported, we move the
registration into the GIC probing function, where we will later know
which combination is valid.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: introduce per-VM ops
Andre Przywara [Mon, 2 Jun 2014 14:19:12 +0000 (16:19 +0200)]
arm/arm64: KVM: introduce per-VM ops

Currently we only have one virtual GIC model supported, so all guests
use the same emulation code. With the addition of another model we
end up with different guests using potentially different vGIC models,
so we have to split up some functions to be per VM.
Introduce a vgic_vm_ops struct to hold function pointers for those
functions that are different and provide the necessary code to
initialize them.
Also split up the vgic_init() function to separate out VGIC model
specific functionality into a separate function, which will later be
different for a GICv3 model.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones
Andre Przywara [Thu, 5 Jun 2014 14:07:50 +0000 (16:07 +0200)]
arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones

Some GICv3 registers can and will be accessed as 64 bit registers.
Currently the register handling code can only deal with 32 bit
accesses, so we do two consecutive calls to cover this.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: refactor vgic_handle_mmio() function
Andre Przywara [Mon, 2 Jun 2014 20:44:37 +0000 (22:44 +0200)]
arm/arm64: KVM: refactor vgic_handle_mmio() function

Currently we only need to deal with one MMIO region for the GIC
emulation (the GICv2 distributor), but we soon need to extend this.
Refactor the existing code to allow easier addition of different
ranges without code duplication.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: pass down user space provided GIC type into vGIC code
Andre Przywara [Tue, 3 Jun 2014 07:33:10 +0000 (09:33 +0200)]
arm/arm64: KVM: pass down user space provided GIC type into vGIC code

With the introduction of a second emulated GIC model we need to let
userspace specify the GIC model to use for each VM. Pass the
userspace provided value down into the vGIC code and store it there
to differentiate later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: rework MPIDR assignment and add accessors
Andre Przywara [Mon, 2 Jun 2014 13:37:13 +0000 (15:37 +0200)]
arm/arm64: KVM: rework MPIDR assignment and add accessors

The virtual MPIDR registers (containing topology information) for the
guest are currently mapped linearily to the vcpu_id. Improve this
mapping for arm64 by using three levels to not artificially limit the
number of vCPUs.
To help this, change and rename the kvm_vcpu_get_mpidr() function to
mask off the non-affinity bits in the MPIDR register.
Also add an accessor to later allow easier access to a vCPU with a
given MPIDR. Use this new accessor in the PSCI emulation.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoOptimize TLB flush in kvm_mmu_slot_remove_write_access.
Kai Huang [Mon, 12 Jan 2015 07:28:54 +0000 (15:28 +0800)]
Optimize TLB flush in kvm_mmu_slot_remove_write_access.

No TLB flush is needed when there's no valid rmap in memory slot.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agox86: kvm: vmx: Remove some unused functions
Rickard Strandqvist [Sun, 11 Jan 2015 18:02:26 +0000 (19:02 +0100)]
x86: kvm: vmx: Remove some unused functions

Removes some functions that are not used anywhere:
cpu_has_vmx_eptp_writeback() cpu_has_vmx_eptp_uncacheable()

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: arm/arm64: Enable Dirty Page logging for ARMv8
Mario Smarduch [Thu, 15 Jan 2015 23:59:01 +0000 (15:59 -0800)]
KVM: arm/arm64: Enable Dirty Page logging for ARMv8

This patch enables ARMv8 ditry page logging support. Plugs ARMv8 into generic
layer through Kconfig symbol, and drops earlier ARM64 constraints to enable
logging at architecture layer.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: arm64: Add HYP interface to flush VM Stage 1/2 TLB entries
Mario Smarduch [Thu, 15 Jan 2015 23:59:00 +0000 (15:59 -0800)]
KVM: arm64: Add HYP interface to flush VM Stage 1/2 TLB entries

This patch adds support for arm64 hyp interface to flush all TLBs associated
with VMID.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: arm64: ARMv8 header changes for page logging
Mario Smarduch [Thu, 15 Jan 2015 23:58:59 +0000 (15:58 -0800)]
KVM: arm64: ARMv8 header changes for page logging

This patch adds arm64 helpers to write protect pmds/ptes and retrieve
permissions while logging dirty pages. Also adds prototype to write protect
a memory slot and adds a pmd define to check for read-only pmds.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: arm: page logging 2nd stage fault handling
Mario Smarduch [Thu, 15 Jan 2015 23:58:58 +0000 (15:58 -0800)]
KVM: arm: page logging 2nd stage fault handling

This patch adds support for 2nd stage page fault handling while dirty page
logging. On huge page faults, huge pages are dissolved to normal pages, and
rebuilding of 2nd stage huge pages is blocked. In case migration is
canceled this restriction is removed and huge pages may be rebuilt again.

Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoKVM: arm: dirty logging write protect support
Mario Smarduch [Thu, 15 Jan 2015 23:58:57 +0000 (15:58 -0800)]
KVM: arm: dirty logging write protect support

Add support to track dirty pages between user space KVM_GET_DIRTY_LOG ioctl
calls. We call kvm_get_dirty_log_protect() function to do most of the work.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: arm: Add initial dirty page locking support
Mario Smarduch [Thu, 15 Jan 2015 23:58:56 +0000 (15:58 -0800)]
KVM: arm: Add initial dirty page locking support

Add support for initial write protection of VM memslots. This patch
series assumes that huge PUDs will not be used in 2nd stage tables, which is
always valid on ARMv7

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: arm: Add ARMv7 API to flush TLBs
Mario Smarduch [Thu, 15 Jan 2015 23:58:55 +0000 (15:58 -0800)]
KVM: arm: Add ARMv7 API to flush TLBs

This patch adds ARMv7 architecture TLB Flush function.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: x86: switch to kvm_get_dirty_log_protect
Paolo Bonzini [Thu, 15 Jan 2015 23:58:54 +0000 (15:58 -0800)]
KVM: x86: switch to kvm_get_dirty_log_protect

We now have a generic function that does most of the work of
kvm_vm_ioctl_get_dirty_log, now use it.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: Add generic support for dirty page logging
Mario Smarduch [Thu, 15 Jan 2015 23:58:53 +0000 (15:58 -0800)]
KVM: Add generic support for dirty page logging

kvm_get_dirty_log() provides generic handling of dirty bitmap, currently reused
by several architectures. Building on that we intrdoduce
kvm_get_dirty_log_protect() adding write protection to mark these pages dirty
for future write access, before next KVM_GET_DIRTY_LOG ioctl call from user
space.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoKVM: Add architecture-defined TLB flush support
Mario Smarduch [Thu, 15 Jan 2015 23:58:52 +0000 (15:58 -0800)]
KVM: Add architecture-defined TLB flush support

Allow architectures to override the generic kvm_flush_remote_tlbs()
function via HAVE_KVM_ARCH_TLB_FLUSH_ALL. ARMv7 will need this to
provide its own TLB flush interface.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
9 years agoarm64: kvm: decode ESR_ELx.EC when reporting exceptions
Mark Rutland [Wed, 7 Jan 2015 11:26:18 +0000 (11:26 +0000)]
arm64: kvm: decode ESR_ELx.EC when reporting exceptions

To aid the developer when something triggers an unexpected exception,
decode the ESR_ELx.EC field when logging an ESR_ELx value using the
newly introduced esr_get_class_string. This doesn't tell the developer
the specifics of the exception encoded in the remaining IL and ISS bits,
but it can be helpful to distinguish between exception classes (e.g.
SError and a data abort) without having to manually decode the field,
which can be tiresome.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: kvm: remove ESR_EL2_* macros
Mark Rutland [Mon, 24 Nov 2014 14:05:44 +0000 (14:05 +0000)]
arm64: kvm: remove ESR_EL2_* macros

Now that all users have been moved over to the common ESR_ELx_* macros,
remove the redundant ESR_EL2 macros. To maintain compatibility with the
fault handling code shared with 32-bit, the FSC_{FAULT,PERM} macros are
retained as aliases for the common ESR_ELx_FSC_{FAULT,PERM} definitions.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: remove ESR_EL1_* macros
Mark Rutland [Mon, 24 Nov 2014 14:03:52 +0000 (14:03 +0000)]
arm64: remove ESR_EL1_* macros

Now that all users have been moved over to the common ESR_ELx_* macros,
remove the redundant ESR_EL1 macros.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: kvm: move to ESR_ELx macros
Mark Rutland [Mon, 24 Nov 2014 13:59:30 +0000 (13:59 +0000)]
arm64: kvm: move to ESR_ELx macros

Now that we have common ESR_ELx macros, make use of them in the arm64
KVM code. The addition of <asm/esr.h> to the include path highlighted
badly ordered (i.e. not alphabetical) include lists; these are changed
to alphabetical order.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: decode ESR_ELx.EC when reporting exceptions
Mark Rutland [Tue, 18 Nov 2014 12:16:30 +0000 (12:16 +0000)]
arm64: decode ESR_ELx.EC when reporting exceptions

To aid the developer when something triggers an unexpected exception,
decode the ESR_ELx.EC field when logging an ESR_ELx value. This doesn't
tell the developer the specifics of the exception encoded in the
remaining IL and ISS bits, but it can be helpful to distinguish between
exception classes (e.g. SError and a data abort) without having to
manually decode the field, which can be tiresome.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: move to ESR_ELx macros
Mark Rutland [Mon, 24 Nov 2014 12:31:40 +0000 (12:31 +0000)]
arm64: move to ESR_ELx macros

Now that we have common ESR_ELx_* macros, move the core arm64 code over
to them.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoarm64: introduce common ESR_ELx_* definitions
Mark Rutland [Mon, 24 Nov 2014 12:03:32 +0000 (12:03 +0000)]
arm64: introduce common ESR_ELx_* definitions

Currently we have separate ESR_EL{1,2}_* macros, despite the fact that
the encodings are common. While encodings are architected to refer to
the current EL or a lower EL, the macros refer to particular ELs (e.g.
ESR_ELx_EC_DABT_EL0). Having these duplicate definitions is redundant,
and their naming is misleading.

This patch introduces common ESR_ELx_* macros that can be used in all
cases, in preparation for later patches which will migrate existing
users over. Some additional cleanups are made in the process:

* Suffixes for particular exception levelts (e.g. _EL0, _EL1) are
  replaced with more general _LOW and _CUR suffixes, matching the
  architectural intent.

* ESR_ELx_EC_WFx, rather than ESR_ELx_EC_WFI is introduced, as this
  EC encoding covers traps from both WFE and WFI. Similarly,
  ESR_ELx_WFx_ISS_WFE rather than ESR_ELx_EC_WFI_ISS_WFE is introduced.

* Multi-bit fields are given consistently named _SHIFT and _MASK macros.

* UL() is used for compatiblity with assembly files.

* Comments are added for currently unallocated ESR_ELx.EC encodings.

For fields other than ESR_ELx.EC, macros are only implemented for fields
for which there is already an ESR_EL{1,2}_* macro.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
9 years agoARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe
Andre Przywara [Mon, 12 Jan 2015 16:56:16 +0000 (16:56 +0000)]
ARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe

Currently the trace printk talks about "wfi" only, though the trace
point triggers both on wfi and wfe traps.
Add a parameter to differentiate between the two.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Wei Huang <wei@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoarm/arm64: KVM: add tracing support for arm64 exit handler
Wei Huang [Mon, 12 Jan 2015 16:53:36 +0000 (11:53 -0500)]
arm/arm64: KVM: add tracing support for arm64 exit handler

arm64 uses its own copy of exit handler (arm64/kvm/handle_exit.c).
Currently this file doesn't hook up with any trace points. As a result
users might not see certain events (e.g. HVC & WFI) while using ftrace
with arm64 KVM. This patch fixes this issue by adding a new trace file
and defining two trace events (one of which is shared by wfi and wfe)
for arm64. The new trace points are then linked with related functions
in handle_exit.c.

Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoKVM: arm/arm64: vgic: add init entry to VGIC KVM device
Eric Auger [Mon, 15 Dec 2014 17:43:33 +0000 (18:43 +0100)]
KVM: arm/arm64: vgic: add init entry to VGIC KVM device

Since the advent of VGIC dynamic initialization, this latter is
initialized quite late on the first vcpu run or "on-demand", when
injecting an IRQ or when the guest sets its registers.

This initialization could be initiated explicitly much earlier
by the users-space, as soon as it has provided the requested
dimensioning parameters.

This patch adds a new entry to the VGIC KVM device that allows
the user to manually request the VGIC init:
- a new KVM_DEV_ARM_VGIC_GRP_CTRL group is introduced.
- Its first attribute is KVM_DEV_ARM_VGIC_CTRL_INIT

The rationale behind introducing a group is to be able to add other
controls later on, if needed.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoKVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu
Eric Auger [Mon, 15 Dec 2014 17:43:32 +0000 (18:43 +0100)]
KVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu

To be more explicit on vgic initialization failure, -ENODEV is
returned by vgic_init when no online vcpus can be found at init.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
9 years agoKVM: x86: #PF error-code on R/W operations is wrong
Nadav Amit [Thu, 25 Dec 2014 00:52:16 +0000 (02:52 +0200)]
KVM: x86: #PF error-code on R/W operations is wrong

When emulating an instruction that reads the destination memory operand (i.e.,
instructions without the Mov flag in the emulator), the operand is first read.
If a page-fault is detected in this phase, the error-code which would be
delivered to the VM does not indicate that the access that caused the exception
is a write one. This does not conform with real hardware, and may cause the VM
to enter the page-fault handler twice for no reason (once for read, once for
write).

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: flush TLB when D bit is manually changed.
Kai Huang [Fri, 9 Jan 2015 08:44:30 +0000 (16:44 +0800)]
KVM: x86: flush TLB when D bit is manually changed.

When software changes D bit (either from 1 to 0, or 0 to 1), the
corresponding TLB entity in the hardware won't be updated immediately. We
should flush it to guarantee the consistence of D bit between TLB and
MMU page table in memory.  This is especially important when clearing
the D bit, since it may cause false negatives in reporting dirtiness.

Sanity test was done on my machine with Intel processor.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
[Check A bit too. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: allow TSC deadline timer on all hosts
Radim Krčmář [Thu, 8 Jan 2015 14:59:30 +0000 (15:59 +0100)]
KVM: x86: allow TSC deadline timer on all hosts

Emulation does not utilize the feature.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agokvm: x86: Remove kvm_make_request from lapic.c
Nicholas Krause [Fri, 2 Jan 2015 03:05:18 +0000 (22:05 -0500)]
kvm: x86: Remove kvm_make_request from lapic.c

Adds a function kvm_vcpu_set_pending_timer instead of calling
kvm_make_request in lapic.c.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Access to LDT/GDT that wraparound is incorrect
Nadav Amit [Thu, 25 Dec 2014 00:52:23 +0000 (02:52 +0200)]
KVM: x86: Access to LDT/GDT that wraparound is incorrect

When access to descriptor in LDT/GDT wraparound outside long-mode, the address
of the descriptor should be truncated to 32-bit.  Citing Intel SDM 2.1.1.1
"Global and Local Descriptor Tables in IA-32e Mode": "GDTR and LDTR registers
are expanded to 64-bits wide in both IA-32e sub-modes (64-bit mode and
compatibility mode)."

So in other cases, we need to truncate. Creating new function to return a
pointer to descriptor table to avoid too much code duplication.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
[Wrap 64-bit check with #ifdef CONFIG_X86_64, to avoid a "right shift count
 >= width of type" warning and consequent undefined behavior. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: Do not set access bit on accessed segments
Nadav Amit [Thu, 25 Dec 2014 00:52:22 +0000 (02:52 +0200)]
KVM: x86: Do not set access bit on accessed segments

When segment is loaded, the segment access bit is set unconditionally.  In
fact, it should be set conditionally, based on whether the segment had the
accessed bit set before. In addition, it can improve performance.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: POP [ESP] is not emulated correctly
Nadav Amit [Thu, 25 Dec 2014 00:52:21 +0000 (02:52 +0200)]
KVM: x86: POP [ESP] is not emulated correctly

According to Intel SDM: "If the ESP register is used as a base register for
addressing a destination operand in memory, the POP instruction computes the
effective address of the operand after it increments the ESP register."

The current emulation does not behave so. The fix required to waste another
of the precious instruction flags and to check the flag in decode_modrm.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: em_call_far should return failure result
Nadav Amit [Thu, 25 Dec 2014 00:52:20 +0000 (02:52 +0200)]
KVM: x86: em_call_far should return failure result

Currently, if em_call_far fails it returns success instead of the resulting
error-code. Fix it.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: JMP/CALL using call- or task-gate causes exception
Nadav Amit [Thu, 25 Dec 2014 00:52:19 +0000 (02:52 +0200)]
KVM: x86: JMP/CALL using call- or task-gate causes exception

The KVM emulator does not emulate JMP and CALL that target a call gate or a
task gate.  This patch does not try to implement these scenario as they are
presumably rare; yet it returns X86EMUL_UNHANDLEABLE error in such cases
instead of generating an exception.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: fnstcw and fnstsw may cause spurious exception
Nadav Amit [Thu, 25 Dec 2014 00:52:18 +0000 (02:52 +0200)]
KVM: x86: fnstcw and fnstsw may cause spurious exception

Since the operand size of fnstcw and fnstsw is updated during the execution,
the emulation may cause spurious exceptions as it reads the memory beforehand.

Marking these instructions as Mov (since the previous value is ignored) and
DstMem16 to simplify the setting of operand size.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: pop sreg accesses only 2 bytes
Nadav Amit [Thu, 25 Dec 2014 00:52:17 +0000 (02:52 +0200)]
KVM: x86: pop sreg accesses only 2 bytes

Although pop sreg updates RSP according to the operand size, only 2 bytes are
read.  The current behavior may result in incorrect #GP or #PF exceptions.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: mmu: replace assertions with MMU_WARN_ON, a conditional WARN_ON
Paolo Bonzini [Wed, 2 Oct 2013 14:56:16 +0000 (16:56 +0200)]
KVM: x86: mmu: replace assertions with MMU_WARN_ON, a conditional WARN_ON

This makes the direction of the conditions consistent with code that
is already using WARN_ON.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: mmu: remove ASSERT(vcpu)
Paolo Bonzini [Wed, 2 Oct 2013 14:56:15 +0000 (16:56 +0200)]
KVM: x86: mmu: remove ASSERT(vcpu)

Because ASSERT is just a printk, these would oops right away.
The assertion thus hardly adds anything.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
9 years agoKVM: x86: mmu: remove argument to kvm_init_shadow_mmu and kvm_init_shadow_ept_mmu
Paolo Bonzini [Wed, 2 Oct 2013 14:56:14 +0000 (16:56 +0200)]
KVM: x86: mmu: remove argument to kvm_init_shadow_mmu and kvm_init_shadow_ept_mmu

The initialization function in mmu.c can always use walk_mmu, which
is known to be vcpu->arch.mmu.  Only init_kvm_nested_mmu is used to
initialize vcpu->arch.nested_mmu.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>