From 1520f8bb671ce3c1b8a3b5ed3bbdfe1a06aa8691 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini
Date: Tue, 21 Dec 2021 10:12:53 +0100
Subject: KVM: x86: ignore interrupt_bitmap field of KVM_GET/SET_SREGS

This is unnecessary, because the interrupt would be retrieved and queued
anyway by KVM_GET_VCPU_EVENTS and KVM_SET_VCPU_EVENTS respectively,
and it makes the flow more similar to the one for KVM_GET/SET_SREGS2.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/kvm/kvm.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

(limited to 'target/i386')

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index d81745620b..2c8feb4a6f 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2607,11 +2607,11 @@ static int kvm_put_sregs(X86CPU *cpu)
     CPUX86State *env = &cpu->env;
     struct kvm_sregs sregs;
 
+    /*
+     * The interrupt_bitmap is ignored because KVM_SET_SREGS is
+     * always followed by KVM_SET_VCPU_EVENTS.
+     */
     memset(sregs.interrupt_bitmap, 0, sizeof(sregs.interrupt_bitmap));
-    if (env->interrupt_injected >= 0) {
-        sregs.interrupt_bitmap[env->interrupt_injected / 64] |=
-                (uint64_t)1 << (env->interrupt_injected % 64);
-    }
 
     if ((env->eflags & VM_MASK)) {
         set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
@@ -3341,23 +3341,17 @@ static int kvm_get_sregs(X86CPU *cpu)
 {
     CPUX86State *env = &cpu->env;
     struct kvm_sregs sregs;
-    int bit, i, ret;
+    int ret;
 
     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_SREGS, &sregs);
     if (ret < 0) {
         return ret;
     }
 
-    /* There can only be one pending IRQ set in the bitmap at a time, so try
-       to find it and save its number instead (-1 for none). */
-    env->interrupt_injected = -1;
-    for (i = 0; i < ARRAY_SIZE(sregs.interrupt_bitmap); i++) {
-        if (sregs.interrupt_bitmap[i]) {
-            bit = ctz64(sregs.interrupt_bitmap[i]);
-            env->interrupt_injected = i * 64 + bit;
-            break;
-        }
-    }
+    /*
+     * The interrupt_bitmap is ignored because KVM_GET_SREGS is
+     * always preceded by KVM_GET_VCPU_EVENTS.
+     */
 
     get_seg(&env->segs[R_CS], &sregs.cs);
     get_seg(&env->segs[R_DS], &sregs.ds);
-- 
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