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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-05-29 13:11:18 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-31 18:00:59 +0100 |
| commit | 5d81f7dc9bca4f4963092433e27b508cbe524a32 (patch) | |
| tree | e31e1f9ca381c4bdbe67118b6e2dc79c634bd20c /virt | |
| parent | b4f18c063a13dfb33e3a63fe1844823e19c2265e (diff) | |
| download | lwn-5d81f7dc9bca4f4963092433e27b508cbe524a32.tar.gz lwn-5d81f7dc9bca4f4963092433e27b508cbe524a32.zip | |
arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID
Now that all our infrastructure is in place, let's expose the
availability of ARCH_WORKAROUND_2 to guests. We take this opportunity
to tidy up a couple of SMCCC constants.
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/psci.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c index c4762bef13c6..c95ab4c5a475 100644 --- a/virt/kvm/arm/psci.c +++ b/virt/kvm/arm/psci.c @@ -405,7 +405,7 @@ static int kvm_psci_call(struct kvm_vcpu *vcpu) int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) { u32 func_id = smccc_get_function(vcpu); - u32 val = PSCI_RET_NOT_SUPPORTED; + u32 val = SMCCC_RET_NOT_SUPPORTED; u32 feature; switch (func_id) { @@ -417,7 +417,21 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) switch(feature) { case ARM_SMCCC_ARCH_WORKAROUND_1: if (kvm_arm_harden_branch_predictor()) - val = 0; + val = SMCCC_RET_SUCCESS; + break; + case ARM_SMCCC_ARCH_WORKAROUND_2: + switch (kvm_arm_have_ssbd()) { + case KVM_SSBD_FORCE_DISABLE: + case KVM_SSBD_UNKNOWN: + break; + case KVM_SSBD_KERNEL: + val = SMCCC_RET_SUCCESS; + break; + case KVM_SSBD_FORCE_ENABLE: + case KVM_SSBD_MITIGATED: + val = SMCCC_RET_NOT_REQUIRED; + break; + } break; } break; |