From: Yosry Ahmed <yosry@kernel.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Jim Mattson <jmattson@google.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Yosry Ahmed <yosry@kernel.org>
Subject: [PATCH v3 18/27] KVM: nSVM: Split nested_svm_transition_tlb_flush() into entry/exit fns
Date: Mon, 12 Oct 2026 23:36:29 +0000 [thread overview]
Message-ID: <20261012233638.2546339-19-yosry@kernel.org> (raw)
In-Reply-To: <20261012233638.2546339-1-yosry@kernel.org>
The handling for the entry and exit TLB flushes will diverge
significantly in the following changes. Instead of adding an 'is_vmenter'
argument like nested_vmx_transition_tlb_flush(), just split the function
into two variants for 'entry' and 'exit'.
No functional change intended.
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
---
arch/x86/kvm/svm/nested.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 27f78228a42d5..efe7a39b53656 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -688,7 +688,7 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
vmcb12->control.exit_int_info = exit_int_info;
}
-static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
+static void nested_svm_entry_tlb_flush(struct kvm_vcpu *vcpu)
{
/* Handle pending Hyper-V TLB flush requests */
kvm_hv_nested_transtion_tlb_flush(vcpu, npt_enabled);
@@ -708,6 +708,14 @@ static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}
+static void nested_svm_exit_tlb_flush(struct kvm_vcpu *vcpu)
+{
+ kvm_hv_nested_transtion_tlb_flush(vcpu, npt_enabled);
+
+ kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
+}
+
/*
* Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
* if we are emulating VM-Entry into a guest with NPT enabled.
@@ -858,7 +866,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
struct vmcb *vmcb01 = svm->vmcb01.ptr;
struct kvm_vcpu *vcpu = &svm->vcpu;
- nested_svm_transition_tlb_flush(vcpu);
+ nested_svm_entry_tlb_flush(vcpu);
/* Enter Guest-Mode */
enter_guest_mode(vcpu);
@@ -1434,7 +1442,7 @@ void nested_svm_vmexit(struct vcpu_svm *svm)
svm->vcpu.arch.dr7 = DR7_FIXED_1;
kvm_update_dr7(&svm->vcpu);
- nested_svm_transition_tlb_flush(vcpu);
+ nested_svm_exit_tlb_flush(vcpu);
nested_svm_uninit_mmu_context(vcpu);
@@ -1553,7 +1561,7 @@ void svm_leave_nested(struct kvm_vcpu *vcpu)
*/
__svm_pmu_handle_nested_transition(svm, true);
- nested_svm_transition_tlb_flush(vcpu);
+ nested_svm_exit_tlb_flush(vcpu);
nested_svm_uninit_mmu_context(vcpu);
vmcb_mark_all_dirty(svm->vmcb);
--
2.56.0.385.gd3acb90ef8-goog
next prev parent reply other threads:[~2026-10-12 23:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-12 23:36 [PATCH v3 00/27] KVM: nSVM: Optimize nSVM TLB flushes Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 01/27] KVM: nSVM: Flush the TLB after forcefully leaving nested Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 02/27] KVM: SVM: Document number of ASIDs CPUID setting Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 03/27] KVM: VMX: Generalize VPID allocation to be vendor-neutral Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 04/27] KVM: x86/mmu: Support specifying reserved TLB tags Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 05/27] KVM: SVM: Add helpers to set/clear ASID flush in VMCB Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 06/27] KVM: SVM: Fallback to flush everything if FLUSHBYASID is not available Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 07/27] KVM: SEV: Do ASID initialization at VMCB initialization Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 08/27] KVM: SEV: Expose sev_get_asid() outside of sev.c Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 09/27] KVM: SEV: Explicitly initialize the per vCPU ASID on SEV VM migration Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 10/27] KVM: SVM: Use a static ASID per vCPU Yosry Ahmed
2026-10-12 23:54 ` sashiko-bot
2026-10-12 23:55 ` Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 11/27] KVM: SVM: Only flush the fallback ASID when used by a different vCPU Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 12/27] KVM: nSVM: Drop svm->nested.initialized Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 13/27] KVM: nSVM: Add a placeholder ASID for L2 Yosry Ahmed
2026-10-13 0:01 ` sashiko-bot
2026-10-12 23:36 ` [PATCH v3 14/27] KVM: x86: hyper-v: Rename kvm_hv_vcpu_purge_flush_tlb() Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 15/27] KVM: x86: hyper-v: Allow purging all TLB flush FIFOs Yosry Ahmed
2026-10-12 23:56 ` sashiko-bot
2026-10-12 23:36 ` [PATCH v3 16/27] KVM: nSVM: Flush both L1 and L2 ASIDs on KVM_REQ_TLB_FLUSH Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 17/27] KVM: nSVM: Always switch VMCB before leaving guest mode Yosry Ahmed
2026-10-12 23:36 ` Yosry Ahmed [this message]
2026-10-12 23:36 ` [PATCH v3 19/27] KVM: nSVM: Service local TLB flushes before nested transitions Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 20/27] KVM: x86: Add KVM_REQ_MMU_SYNC_ALL_ROOTS Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 21/27] KVM: nSVM: Handle nested TLB flush requests through TLB_CONTROL Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 22/27] KVM: nSVM: Flush the TLB if L1 changes L2's ASID in vmcb12 Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 23/27] KVM: nSVM: Do not reset TLB_CONTROL in vmcb02 on nested VM-Enter Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 24/27] KVM: nSVM: Flush L2's ASID when emulating INVLPGA Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 25/27] KVM: nSVM: Flush the ASID on nested transitions if shared by L1 and L2 Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 26/27] KVM: nSVM: Use different ASIDs for " Yosry Ahmed
2026-10-12 23:36 ` [PATCH v3 27/27] KVM: selftests: Add a test for nested TLB flushes Yosry Ahmed
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