[PATCH 03/11] KVM: SVM: Don't mark ASID fields as dirty when setting control.tlb_ctl

[Paolo Bonzini]

From: Sean Christopherson <seanjc@xxxxxxxxxx>

Don't mark the ASID as dirty in the VMCB when requesting a TLB flush via
control.tlb_ctl.  Per "15.15.3 VMCB Clean Field" of the July 2026, Revision
3.45 version of the APM:

  The following are explicitly not cached and not represented by Clean bits:

    * TLB_Control

Fixes: 7e8e6eed75e2 ("KVM: SVM: Move asid to vcpu_svm")
Suggested-by: Yosry Ahmed <yosry@xxxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-ID: <20260904170642.3291466-4-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 arch/x86/kvm/svm/sev.c | 1 -
 arch/x86/kvm/svm/svm.c | 4 +---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 6aa86a78711e..3448d56520c6 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -3620,7 +3620,6 @@ int pre_sev_run(struct vcpu_svm *svm, int cpu)
 
 	sd->sev_vmcbs[asid] = svm->vmcb;
 	svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
-	vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
 	return 0;
 }
 
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b63e7c69aa1c..830ace75e986 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4527,10 +4527,8 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu, u64 run_flags)
 		svm->vmcb->control.asid = svm->asid;
 		vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
 	}
-	if (this_cpu_ptr(&svm_data)->flush_all_asids) {
+	if (this_cpu_ptr(&svm_data)->flush_all_asids)
 		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
-		vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
-	}
 
 	svm->vmcb->save.cr2 = vcpu->arch.cr2;
 
-- 
2.52.0