linux-kernel - [PATCH V2] KVM:x86:Fix an interrupt injection logic error during PIC interrupt simulation

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Message-ID: <CACZJ9cX2R_=qgvLdaqbB_DUJhv08c674b67Ln_Qb9yyVwgE16w@mail.gmail.com>
Date: Tue, 30 Jul 2024 21:59:41 +0800
From: Liam Ni <zhiguangni01@...il.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH V2] KVM:x86:Fix an interrupt injection logic error during PIC
 interrupt simulation

The input parameter level to the pic_irq_request function indicates
whether there are interrupts to be injected,
a level value of 1 indicates that there are interrupts to be injected,
and a level value of 0 indicates that there are no interrupts to be injected.
And the value of level will be assigned to s->output,
so we should set s->wakeup_needed to true when s->output is true.

Signed-off-by: Liam Ni <zhiguangni01@...il.com>
---
 arch/x86/kvm/i8259.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 8dec646e764b..ec9d6ee7d33d 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -567,7 +567,7 @@ static void pic_irq_request(struct kvm *kvm, int level)
 {
    struct kvm_pic *s = kvm->arch.vpic;

-   if (!s->output)
+   if (!s->output && level)
        s->wakeup_needed = true;
    s->output = level;
 }
--
2.34.1