From dffe042fd8b2cc174966b929b379503af2c97933 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 14 Mar 2017 10:15:34 +0000 Subject: [PATCH] KVM: MIPS/VZ: Support guest CP0_[X]ContextConfig MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add support for VZ guest CP0_ContextConfig and CP0_XContextConfig (MIPS64 only) registers, as found on P5600 and P6600 cores. These guest registers need initialising, context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org --- Documentation/virtual/kvm/api.txt | 2 + arch/mips/include/asm/kvm_host.h | 4 ++ arch/mips/kvm/vz.c | 62 ++++++++++++++++++++++++++++++- 3 files changed, 66 insertions(+), 2 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 5ef4fa1de7d4..5f53bfdc0d84 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2073,7 +2073,9 @@ registers, find a list below: MIPS | KVM_REG_MIPS_CP0_ENTRYLO0 | 64 MIPS | KVM_REG_MIPS_CP0_ENTRYLO1 | 64 MIPS | KVM_REG_MIPS_CP0_CONTEXT | 64 + MIPS | KVM_REG_MIPS_CP0_CONTEXTCONFIG| 32 MIPS | KVM_REG_MIPS_CP0_USERLOCAL | 64 + MIPS | KVM_REG_MIPS_CP0_XCONTEXTCONFIG| 64 MIPS | KVM_REG_MIPS_CP0_PAGEMASK | 32 MIPS | KVM_REG_MIPS_CP0_PAGEGRAIN | 32 MIPS | KVM_REG_MIPS_CP0_WIRED | 32 diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 3a9ca3326315..5066d89f2227 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -34,7 +34,9 @@ #define KVM_REG_MIPS_CP0_ENTRYLO0 MIPS_CP0_64(2, 0) #define KVM_REG_MIPS_CP0_ENTRYLO1 MIPS_CP0_64(3, 0) #define KVM_REG_MIPS_CP0_CONTEXT MIPS_CP0_64(4, 0) +#define KVM_REG_MIPS_CP0_CONTEXTCONFIG MIPS_CP0_32(4, 1) #define KVM_REG_MIPS_CP0_USERLOCAL MIPS_CP0_64(4, 2) +#define KVM_REG_MIPS_CP0_XCONTEXTCONFIG MIPS_CP0_64(4, 3) #define KVM_REG_MIPS_CP0_PAGEMASK MIPS_CP0_32(5, 0) #define KVM_REG_MIPS_CP0_PAGEGRAIN MIPS_CP0_32(5, 1) #define KVM_REG_MIPS_CP0_WIRED MIPS_CP0_32(6, 0) @@ -665,7 +667,9 @@ __BUILD_KVM_RW_HW(index, 32, MIPS_CP0_TLB_INDEX, 0) __BUILD_KVM_RW_HW(entrylo0, l, MIPS_CP0_TLB_LO0, 0) __BUILD_KVM_RW_HW(entrylo1, l, MIPS_CP0_TLB_LO1, 0) __BUILD_KVM_RW_HW(context, l, MIPS_CP0_TLB_CONTEXT, 0) +__BUILD_KVM_RW_HW(contextconfig, 32, MIPS_CP0_TLB_CONTEXT, 1) __BUILD_KVM_RW_HW(userlocal, l, MIPS_CP0_TLB_CONTEXT, 2) +__BUILD_KVM_RW_HW(xcontextconfig, l, MIPS_CP0_TLB_CONTEXT, 3) __BUILD_KVM_RW_HW(pagemask, l, MIPS_CP0_TLB_PG_MASK, 0) __BUILD_KVM_RW_HW(pagegrain, 32, MIPS_CP0_TLB_PG_MASK, 1) __BUILD_KVM_RW_HW(wired, 32, MIPS_CP0_TLB_WIRED, 0) diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index ec909fcd08ce..97e7a788bf4a 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -131,7 +131,7 @@ static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu) * Config: M, [MT] * Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP * Config2: M - * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP, CTXTC, ITL, LPA, VEIC, + * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC, * VInt, SP, CDMM, MT, SM, TL] * Config4: M, [VTLBSizeExt, MMUSizeExt] * Config5: [MRP] @@ -161,7 +161,7 @@ static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu) static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu) { unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M | - MIPS_CONF3_ULRI; + MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC; /* Permit MSA to be present if MSA is supported */ if (kvm_mips_guest_can_have_msa(&vcpu->arch)) @@ -1205,6 +1205,13 @@ static u64 kvm_vz_get_one_regs[] = { KVM_REG_MIPS_COUNT_HZ, }; +static u64 kvm_vz_get_one_regs_contextconfig[] = { + KVM_REG_MIPS_CP0_CONTEXTCONFIG, +#ifdef CONFIG_64BIT + KVM_REG_MIPS_CP0_XCONTEXTCONFIG, +#endif +}; + static u64 kvm_vz_get_one_regs_kscratch[] = { KVM_REG_MIPS_CP0_KSCRATCH1, KVM_REG_MIPS_CP0_KSCRATCH2, @@ -1225,6 +1232,8 @@ static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu) ++ret; if (cpu_guest_has_badinstrp) ++ret; + if (cpu_guest_has_contextconfig) + ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig); ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask); return ret; @@ -1258,6 +1267,12 @@ static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices) return -EFAULT; ++indices; } + if (cpu_guest_has_contextconfig) { + if (copy_to_user(indices, kvm_vz_get_one_regs_contextconfig, + sizeof(kvm_vz_get_one_regs_contextconfig))) + return -EFAULT; + indices += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig); + } for (i = 0; i < 6; ++i) { if (!cpu_guest_has_kscr(i + 2)) continue; @@ -1323,11 +1338,23 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_CONTEXT: *v = (long)read_gc0_context(); break; + case KVM_REG_MIPS_CP0_CONTEXTCONFIG: + if (!cpu_guest_has_contextconfig) + return -EINVAL; + *v = read_gc0_contextconfig(); + break; case KVM_REG_MIPS_CP0_USERLOCAL: if (!cpu_guest_has_userlocal) return -EINVAL; *v = read_gc0_userlocal(); break; +#ifdef CONFIG_64BIT + case KVM_REG_MIPS_CP0_XCONTEXTCONFIG: + if (!cpu_guest_has_contextconfig) + return -EINVAL; + *v = read_gc0_xcontextconfig(); + break; +#endif case KVM_REG_MIPS_CP0_PAGEMASK: *v = (long)read_gc0_pagemask(); break; @@ -1478,11 +1505,23 @@ static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_CONTEXT: write_gc0_context(v); break; + case KVM_REG_MIPS_CP0_CONTEXTCONFIG: + if (!cpu_guest_has_contextconfig) + return -EINVAL; + write_gc0_contextconfig(v); + break; case KVM_REG_MIPS_CP0_USERLOCAL: if (!cpu_guest_has_userlocal) return -EINVAL; write_gc0_userlocal(v); break; +#ifdef CONFIG_64BIT + case KVM_REG_MIPS_CP0_XCONTEXTCONFIG: + if (!cpu_guest_has_contextconfig) + return -EINVAL; + write_gc0_xcontextconfig(v); + break; +#endif case KVM_REG_MIPS_CP0_PAGEMASK: write_gc0_pagemask(v); break; @@ -1874,8 +1913,12 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_restore_gc0_entrylo0(cop0); kvm_restore_gc0_entrylo1(cop0); kvm_restore_gc0_context(cop0); + if (cpu_guest_has_contextconfig) + kvm_restore_gc0_contextconfig(cop0); #ifdef CONFIG_64BIT kvm_restore_gc0_xcontext(cop0); + if (cpu_guest_has_contextconfig) + kvm_restore_gc0_xcontextconfig(cop0); #endif kvm_restore_gc0_pagemask(cop0); kvm_restore_gc0_pagegrain(cop0); @@ -1933,8 +1976,12 @@ static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu) kvm_save_gc0_entrylo0(cop0); kvm_save_gc0_entrylo1(cop0); kvm_save_gc0_context(cop0); + if (cpu_guest_has_contextconfig) + kvm_save_gc0_contextconfig(cop0); #ifdef CONFIG_64BIT kvm_save_gc0_xcontext(cop0); + if (cpu_guest_has_contextconfig) + kvm_save_gc0_xcontextconfig(cop0); #endif kvm_save_gc0_pagemask(cop0); kvm_save_gc0_pagegrain(cop0); @@ -2298,6 +2345,17 @@ static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu) kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP); } + if (cpu_guest_has_contextconfig) { + /* ContextConfig */ + kvm_write_sw_gc0_contextconfig(cop0, 0x007ffff0); +#ifdef CONFIG_64BIT + /* XContextConfig */ + /* bits SEGBITS-13+3:4 set */ + kvm_write_sw_gc0_xcontextconfig(cop0, + ((1ull << (cpu_vmbits - 13)) - 1) << 4); +#endif + } + /* start with no pending virtual guest interrupts */ if (cpu_has_guestctl2) cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0; -- 2.20.1