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[PATCH] KVM: x86: ignore interrupt_bitmap field of KVM_GET/SET_SREGS
From: |
Paolo Bonzini |
Subject: |
[PATCH] KVM: x86: ignore interrupt_bitmap field of KVM_GET/SET_SREGS |
Date: |
Tue, 21 Dec 2021 10:14:21 +0100 |
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 | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index d81745620b..b42bcbc363 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]);
@@ -3348,16 +3348,10 @@ static int kvm_get_sregs(X86CPU *cpu)
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);
--
2.33.1
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