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KVM: x86: Unconditionally set l1tf_flush_l1d during vCPU load

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Always set l1tf_flush_l1d during kvm_arch_vcpu_load() instead of setting
it only when the vCPU is being scheduled back in.  The flag is processed
only when VM-Enter is imminent, and KVM obviously needs to load the vCPU
before VM-Enter, so attempting to precisely set l1tf_flush_l1d provides no
meaningful value.  I.e. the flag _will_ be set either way, it's simply a
matter of when.

Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20240522014013.1672962-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-05-21 18:40:12 -07:00
parent 2a27c43140
commit ef2e18ef37
1 changed files with 5 additions and 6 deletions
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11
arch/x86/kvm/x86.c
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@ -5006,12 +5006,11 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
if (vcpu->scheduled_out) {
vcpu->arch.l1tf_flush_l1d = true;
if (pmu->version && unlikely(pmu->event_count)) {
pmu->need_cleanup = true;
kvm_make_request(KVM_REQ_PMU, vcpu);
}
vcpu->arch.l1tf_flush_l1d = true;
if (vcpu->scheduled_out && pmu->version && pmu->event_count) {
pmu->need_cleanup = true;
kvm_make_request(KVM_REQ_PMU, vcpu);
}
/* Address WBINVD may be executed by guest */