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KVM: PPC: Book3S HV nestedv2: Do not check msr on hcalls

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The check for a hcall coming from userspace is done for KVM-PR. This is
not supported for nestedv2 and the L0 will directly inject the necessary
exception to the L2 if userspace performs a hcall. Avoid checking the
MSR and thus avoid a H_GUEST_GET_STATE hcall in the L1.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231201132618.555031-4-vaibhav@linux.ibm.com
This commit is contained in:
Jordan Niethe 2023-12-01 18:56:08 +05:30 committed by Michael Ellerman
parent e0d4acbcba
commit 63ccae78cd
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/kvm/book3s_hv.c
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@ -1688,7 +1688,7 @@ static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
{
int i;
if (unlikely(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) {
if (!kvmhv_is_nestedv2() && unlikely(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) {
/*
* Guest userspace executed sc 1. This can only be
* reached by the P9 path because the old path
@ -4949,7 +4949,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
if (run->exit_reason == KVM_EXIT_PAPR_HCALL) {
accumulate_time(vcpu, &vcpu->arch.hcall);
if (WARN_ON_ONCE(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) {
if (!kvmhv_is_nestedv2() && WARN_ON_ONCE(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) {
/*
* These should have been caught reflected
* into the guest by now. Final sanity check: