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KVM: x86: Drop now-superflous setting of l1tf_flush_l1d in vcpu_run()

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Now that KVM unconditionally sets l1tf_flush_l1d in kvm_arch_vcpu_load(),
drop the redundant store from vcpu_run().  The flag is cleared only when
VM-Enter is imminent, deep below vcpu_run(), i.e. barring a KVM bug, it's
impossible for l1tf_flush_l1d to be cleared between loading the vCPU and
calling vcpu_run().

Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20240522014013.1672962-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-05-21 18:40:13 -07:00
parent ef2e18ef37
commit 3dee3b1874
2 changed files with 4 additions and 4 deletions
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7
arch/x86/kvm/vmx/vmx.c
View File

@ -6673,9 +6673,10 @@ static noinstr void vmx_l1d_flush(struct kvm_vcpu *vcpu)
bool flush_l1d;
/*
* Clear the per-vcpu flush bit, it gets set again
* either from vcpu_run() or from one of the unsafe
* VMEXIT handlers.
* Clear the per-vcpu flush bit, it gets set again if the vCPU
* is reloaded, i.e. if the vCPU is scheduled out or if KVM
* exits to userspace, or if KVM reaches one of the unsafe
* VMEXIT handlers, e.g. if KVM calls into the emulator.
*/
flush_l1d = vcpu->arch.l1tf_flush_l1d;
vcpu->arch.l1tf_flush_l1d = false;

1
arch/x86/kvm/x86.c
View File

@ -11253,7 +11253,6 @@ static int vcpu_run(struct kvm_vcpu *vcpu)
int r;
vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
vcpu->arch.l1tf_flush_l1d = true;
for (;;) {
/*