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| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2023-09-22 13:25:08 +0200 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-10-09 21:54:25 +0200 |
| commit | e0bb80c62cfd0c289c841d35e412e633299530e3 (patch) | |
| tree | 8f3b31ed6e6271adb455e0c6de4e78aa459572bc /arch/arm64 | |
| parent | KVM: arm64: Add handler for MOPS exceptions (diff) | |
| download | linux-e0bb80c62cfd0c289c841d35e412e633299530e3.tar.xz linux-e0bb80c62cfd0c289c841d35e412e633299530e3.zip | |
KVM: arm64: Expose MOPS instructions to guests
Expose the Armv8.8 FEAT_MOPS feature to guests in the ID register and
allow the MOPS instructions to be run in a guest. Only expose MOPS if
the whole system supports it.
Note, it is expected that guests do not use these instructions on MMIO,
similarly to other instructions where ESR_EL2.ISV==0 such as LDP/STP.
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230922112508.1774352-3-kristina.martsenko@arm.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/kvm_arm.h | 4 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/include/nvhe/fixed_config.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 2 |
3 files changed, 5 insertions, 4 deletions
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 5882b2415596..2186927b1d21 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -102,7 +102,9 @@ #define HCR_HOST_NVHE_PROTECTED_FLAGS (HCR_HOST_NVHE_FLAGS | HCR_TSC) #define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H) -#define HCRX_GUEST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_TCR2En) +#define HCRX_GUEST_FLAGS \ + (HCRX_EL2_SMPME | HCRX_EL2_TCR2En | \ + (cpus_have_final_cap(ARM64_HAS_MOPS) ? (HCRX_EL2_MSCEn | HCRX_EL2_MCE2) : 0)) #define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En) /* TCR_EL2 Registers bits */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h b/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h index 37440e1dda93..e91922daa8ca 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h +++ b/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h @@ -197,7 +197,8 @@ #define PVM_ID_AA64ISAR2_ALLOW (\ ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3) | \ - ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) \ + ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) | \ + ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS) \ ) u64 pvm_read_id_reg(const struct kvm_vcpu *vcpu, u32 id); diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 57c8190d5438..9601af2aa062 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1344,7 +1344,6 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3)); if (!cpus_have_final_cap(ARM64_HAS_WFXT)) val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); - val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS); break; case SYS_ID_AA64MMFR2_EL1: val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK; @@ -2095,7 +2094,6 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_AA64ISAR1_EL1_API | ID_AA64ISAR1_EL1_APA)), ID_WRITABLE(ID_AA64ISAR2_EL1, ~(ID_AA64ISAR2_EL1_RES0 | - ID_AA64ISAR2_EL1_MOPS | ID_AA64ISAR2_EL1_APA3 | ID_AA64ISAR2_EL1_GPA3)), ID_UNALLOCATED(6,3), |