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authorAndre Przywara <andre.przywara@arm.com>2019-05-03 15:27:48 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2019-07-05 13:56:27 +0100
commitc118bbb52743df70e6297671606c1c08edc659fe (patch)
tree3058edcfc6f08fa7b68f9e5ff037c9dc219255a6 /virt
parent80f393a23be68e2f8a0f74258d6155438c200bbd (diff)
arm64: KVM: Propagate full Spectre v2 workaround state to KVM guests
Recent commits added the explicit notion of "workaround not required" to the state of the Spectre v2 (aka. BP_HARDENING) workaround, where we just had "needed" and "unknown" before. Export this knowledge to the rest of the kernel and enhance the existing kvm_arm_harden_branch_predictor() to report this new state as well. Export this new state to guests when they use KVM's firmware interface emulation. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/psci.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
index be3c9cdca9f3..355b9e38a42d 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -401,8 +401,16 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
feature = smccc_get_arg1(vcpu);
switch(feature) {
case ARM_SMCCC_ARCH_WORKAROUND_1:
- if (kvm_arm_harden_branch_predictor())
+ switch (kvm_arm_harden_branch_predictor()) {
+ case KVM_BP_HARDEN_UNKNOWN:
+ break;
+ case KVM_BP_HARDEN_WA_NEEDED:
val = SMCCC_RET_SUCCESS;
+ break;
+ case KVM_BP_HARDEN_NOT_REQUIRED:
+ val = SMCCC_RET_NOT_REQUIRED;
+ break;
+ }
break;
case ARM_SMCCC_ARCH_WORKAROUND_2:
switch (kvm_arm_have_ssbd()) {

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