KVM: VMX: Read Posted Interrupt "control" exactly once per loop iteration

[ Upstream commit cfb0e1306a3790eb055ebf7cdb7b0ee8a23e9b6e ]

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 <seanjc@google.com>
Message-Id: <20211009021236.4122790-27-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c
index 696ad48..46fb83d 100644 (file)
--- a/arch/x86/kvm/vmx/posted_intr.c
+++ b/arch/x86/kvm/vmx/posted_intr.c
@@ -51,7 +51,7 @@ 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);
 
@@ -104,7 +104,7 @@ 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");
 
@@ -163,7 +163,7 @@ int pi_pre_block(struct kvm_vcpu *vcpu)
        }
 
        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 "