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ANDROID: KVM: arm64: Don't run a protected VCPU if it isn't runnable

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Don't run a protected VCPU in pKVM if it isn't in a runnable PSCI
state. For protected VMs, the PSCI state is the reference state
for whether they are runnable or not.

Bug: 278749606
Bug: 373638114
Reported-by: Dmytro Maluka <dmaluka@google.com>
Change-Id: I17cc60852aa45225e65fe810f9b196e3afe88a70
Signed-off-by: Fuad Tabba <tabba@google.com>
This commit is contained in:
Fuad Tabba
2024-10-17 09:50:23 +01:00
parent 1fe91f863a
commit add3d68602
1 changed files with 14 additions and 7 deletions
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21
arch/arm64/kvm/hyp/nvhe/hyp-main.c
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@@ -576,9 +576,6 @@ static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
hyp_entry_exit_handler_fn ec_handler;
u8 esr_ec;
if (READ_ONCE(hyp_vcpu->power_state) == PSCI_0_2_AFFINITY_LEVEL_ON_PENDING)
pkvm_reset_vcpu(hyp_vcpu);
/*
* If we deal with a non-protected guest and the state is potentially
* dirty (from a host perspective), copy the state back into the hyp
@@ -823,19 +820,29 @@ static struct kvm_vcpu *__get_host_hyp_vcpus(struct kvm_vcpu *arg,
__get_host_hyp_vcpus(__vcpu, hyp_vcpup); \
})
static bool is_vcpu_runnable(struct pkvm_hyp_vcpu *hyp_vcpu)
{
return (!pkvm_hyp_vcpu_is_protected(hyp_vcpu) ||
hyp_vcpu->power_state == PSCI_0_2_AFFINITY_LEVEL_ON);
}
static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
{
struct pkvm_hyp_vcpu *hyp_vcpu;
struct kvm_vcpu *host_vcpu;
int ret;
int ret = ARM_EXCEPTION_IL;
host_vcpu = get_host_hyp_vcpus(host_ctxt, 1, &hyp_vcpu);
if (!host_vcpu) {
ret = -EINVAL;
if (!host_vcpu)
goto out;
}
if (unlikely(hyp_vcpu)) {
if (hyp_vcpu->power_state == PSCI_0_2_AFFINITY_LEVEL_ON_PENDING)
pkvm_reset_vcpu(hyp_vcpu);
if (unlikely(!is_vcpu_runnable(hyp_vcpu)))
goto out;
flush_hyp_vcpu(hyp_vcpu);
ret = __kvm_vcpu_run(&hyp_vcpu->vcpu);