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KVM: nSVM: Refactor checking LBRV enablement in vmcb12 into a helper

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Refactor the vCPU cap and vmcb12 flag checks into a helper. The
unlikely() annotation is dropped, it's unlikely (huh) to make a
difference and the CPU will probably predict it better on its own.

CC: stable@vger.kernel.org
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260303003421.2185681-7-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed 2026-03-03 00:34:00 +00:00 committed by Sean Christopherson
parent 01ddcdc55e
commit 290c8d8202
1 changed files with 8 additions and 4 deletions
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12
arch/x86/kvm/svm/nested.c
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@ -640,6 +640,12 @@ void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm)
svm->nested.vmcb02.ptr->save.g_pat = svm->vmcb01.ptr->save.g_pat;
}
static bool nested_vmcb12_has_lbrv(struct kvm_vcpu *vcpu)
{
return guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
(to_svm(vcpu)->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK);
}
static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
{
bool new_vmcb12 = false;
@ -704,8 +710,7 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
vmcb_mark_dirty(vmcb02, VMCB_DR);
}
if (unlikely(guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
if (nested_vmcb12_has_lbrv(vcpu)) {
/*
* Reserved bits of DEBUGCTL are ignored. Be consistent with
* svm_set_msr's definition of reserved bits.
@ -1233,8 +1238,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
if (!nested_exit_on_intr(svm))
kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
if (unlikely(guest_cpu_cap_has(vcpu, X86_FEATURE_LBRV) &&
(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
if (nested_vmcb12_has_lbrv(vcpu)) {
svm_copy_lbrs(&vmcb12->save, &vmcb02->save);
} else {
svm_copy_lbrs(&vmcb01->save, &vmcb02->save);