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KVM: X86: Do not yield to self

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If the target is self we do not need to yield, we can avoid malicious
guest to play this.

Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1617941911-5338-3-git-send-email-wanpengli@tencent.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2021-04-09 12:18:31 +08:00 committed by Paolo Bonzini
parent 4a7132efff
commit a1fa4cbd53
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/x86.c
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@ -8228,6 +8228,10 @@ static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
if (!target || !READ_ONCE(target->ready))
goto no_yield;
/* Ignore requests to yield to self */
if (vcpu == target)
goto no_yield;
if (kvm_vcpu_yield_to(target) <= 0)
goto no_yield;