From cfb0e1306a3790eb055ebf7cdb7b0ee8a23e9b6e Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 8 Oct 2021 19:12:19 -0700 Subject: [PATCH] KVM: VMX: Read Posted Interrupt "control" exactly once per loop iteration Use READ_ONCE() when loading the posted interrupt descriptor control field to ensure "old" and "new" have the same base value. If the compiler emits separate loads, and loads into "new" before "old", KVM could theoretically drop the ON bit if it were set between the loads. Fixes: 28b835d60fcc ("KVM: Update Posted-Interrupts Descriptor when vCPU is preempted") Signed-off-by: Sean Christopherson Message-Id: <20211009021236.4122790-27-seanjc@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/posted_intr.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c index b72dbe80f87a..a1ce598e9544 100644 --- a/arch/x86/kvm/vmx/posted_intr.c +++ b/arch/x86/kvm/vmx/posted_intr.c @@ -54,7 +54,7 @@ void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) /* The full case. */ do { - old.control = new.control = pi_desc->control; + old.control = new.control = READ_ONCE(pi_desc->control); dest = cpu_physical_id(cpu); @@ -107,7 +107,7 @@ static void __pi_post_block(struct kvm_vcpu *vcpu) unsigned int dest; do { - old.control = new.control = pi_desc->control; + old.control = new.control = READ_ONCE(pi_desc->control); WARN(old.nv != POSTED_INTR_WAKEUP_VECTOR, "Wakeup handler not enabled while the VCPU is blocked\n"); @@ -160,7 +160,7 @@ int pi_pre_block(struct kvm_vcpu *vcpu) spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->cpu)); do { - old.control = new.control = pi_desc->control; + old.control = new.control = READ_ONCE(pi_desc->control); WARN((pi_desc->sn == 1), "Warning: SN field of posted-interrupts " -- 2.11.0