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Subject[RESEND v5 2/4] KVM: X86: Reset the vcpu->run->flags at the beginning of vcpu_run
Date
Reset the vcpu->run->flags at the beginning of kvm_arch_vcpu_ioctl_run.
It can avoid every thunk of code that needs to set the flag clear it,
which increases the odds of missing a case and ending up with a flag in
an undefined state.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
arch/x86/kvm/x86.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3f7c1fc7a3ce..ded2149497ba 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8189,12 +8189,14 @@ static void post_kvm_run_save(struct kvm_vcpu *vcpu)
kvm_run->if_flag = !vcpu->arch.guest_state_protected
&& (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;

- kvm_run->flags = is_smm(vcpu) ? KVM_RUN_X86_SMM : 0;
kvm_run->cr8 = kvm_get_cr8(vcpu);
kvm_run->apic_base = kvm_get_apic_base(vcpu);
kvm_run->ready_for_interrupt_injection =
pic_in_kernel(vcpu->kvm) ||
kvm_vcpu_ready_for_interrupt_injection(vcpu);
+
+ if (is_smm(vcpu))
+ kvm_run->flags |= KVM_RUN_X86_SMM;
}

static void update_cr8_intercept(struct kvm_vcpu *vcpu)
@@ -9305,6 +9307,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)

vcpu_load(vcpu);
kvm_sigset_activate(vcpu);
+ kvm_run->flags = 0;
kvm_load_guest_fpu(vcpu);

if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
--
2.17.1
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