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| author | James Morse <james.morse@arm.com> | 2018-01-15 20:39:01 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-01-16 16:08:41 +0100 |
| commit | 4715c14bc136687bb79d12e24aafdc0f38786eb7 (patch) | |
| tree | eb35b59c2d79f731c1aacb722cead88cbe67b9c8 /arch/arm64/kvm/hyp | |
| parent | KVM: arm/arm64: mask/unmask daif around VHE guests (diff) | |
| download | linux-4715c14bc136687bb79d12e24aafdc0f38786eb7.tar.xz linux-4715c14bc136687bb79d12e24aafdc0f38786eb7.zip | |
KVM: arm64: Set an impdef ESR for Virtual-SError using VSESR_EL2.
Prior to v8.2's RAS Extensions, the HCR_EL2.VSE 'virtual SError' feature
generated an SError with an implementation defined ESR_EL1.ISS, because we
had no mechanism to specify the ESR value.
On Juno this generates an all-zero ESR, the most significant bit 'ISV'
is clear indicating the remainder of the ISS field is invalid.
With the RAS Extensions we have a mechanism to specify this value, and the
most significant bit has a new meaning: 'IDS - Implementation Defined
Syndrome'. An all-zero SError ESR now means: 'RAS error: Uncategorized'
instead of 'no valid ISS'.
Add KVM support for the VSESR_EL2 register to specify an ESR value when
HCR_EL2.VSE generates a virtual SError. Change kvm_inject_vabt() to
specify an implementation-defined value.
We only need to restore the VSESR_EL2 value when HCR_EL2.VSE is set, KVM
save/restores this bit during __{,de}activate_traps() and hardware clears the
bit once the guest has consumed the virtual-SError.
Future patches may add an API (or KVM CAP) to pend a virtual SError with
a specified ESR.
Cc: Dongjiu Geng <gengdongjiu@huawei.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kvm/hyp')
| -rw-r--r-- | arch/arm64/kvm/hyp/switch.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 324f4202cdd5..b425b8aab45b 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -94,6 +94,9 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu) write_sysreg(val, hcr_el2); + if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && (val & HCR_VSE)) + write_sysreg_s(vcpu->arch.vsesr_el2, SYS_VSESR_EL2); + /* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */ write_sysreg(1 << 15, hstr_el2); /* |