From nobody Sun Feb 8 14:10:48 2026 Received: from out-173.mta0.migadu.com (out-173.mta0.migadu.com [91.218.175.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 542581FDA7E for ; Wed, 5 Feb 2025 18:24:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738779868; cv=none; b=kDpZwJHqV60a84jgyfnE69enJrS2ECmTz63kSjp/0Ug+tjyEGEeR8ER2iUdcZhjd71Zf4X8yCKsqwbGgDQ7b7VlOKKb/FNbF77xSuZ71F7kuJ//fSeCNr/AHkLcU60fbIWqPsevTa3z5yqQ4QHpDG/2joug24oFCqYC/ESm3CTc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738779868; c=relaxed/simple; bh=R5/nFuCIKeEoK+vhrKdLcHFTynpfcJCswTg526aSFEQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nEb0az1LeM5PqbOHl42fEbSGwZdnTPPkfDxI8umQSFguwRE6u5J5xbNXXsE0M9XRqNEXnBaZzh3rsAijTYQfZPS1o7xxoCxTsw6TYWzrJcgJ+SibUkhB7+2KnXfzyH4KVu8sTT+m3nkAALkc2w5y26e6ZLeTbcqNQHJu8dxgX4Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=IDCcqaR/; arc=none smtp.client-ip=91.218.175.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="IDCcqaR/" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1738779860; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QuU9TX0aBbgsPkUOX8eud2LZOZtDW9gXXMR6We2Iqqk=; b=IDCcqaR/8eyZ1PioXmRiXNValHTSJufnBPh6l5uHNkCtl8HlsxgtqD8UOvGvKSQk8vvziQ iA2rn4XBucndA/NEdMP3Z7pCVHzsGp2HFCdr2FF03J9MFvHeRFkeKS/QQt85GgF7O59Joi Lo4BaDXpSLefu+FdGOZqGPpomtwUulo= From: Yosry Ahmed To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 02/13] KVM: nSVM: Rework svm_flush_tlb_asid() to operate on a given VMCB Date: Wed, 5 Feb 2025 18:23:51 +0000 Message-ID: <20250205182402.2147495-3-yosry.ahmed@linux.dev> In-Reply-To: <20250205182402.2147495-1-yosry.ahmed@linux.dev> References: <20250205182402.2147495-1-yosry.ahmed@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" svm_flush_tlb_asid() currently operates on the current VMCB. In preparation for properly tracking TLB flushes for L1 and L2 ASIDs, refactor it to work on a given VMCB. All existing callers pass the current VMCB. Create a svm_flush_tlb_guest() wrapper to use as the flush_tlb_guest() callback. kvm_hv_vcpu_purge_flush_tlb() is only called when the current VMCB is passed to maintain current behavior. No functional change intended. Signed-off-by: Yosry Ahmed --- arch/x86/kvm/svm/svm.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 08340ae57777b..2108b48ba4959 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3954,7 +3954,7 @@ static void svm_enable_nmi_window(struct kvm_vcpu *vc= pu) svm->vmcb->save.rflags |=3D (X86_EFLAGS_TF | X86_EFLAGS_RF); } =20 -static void svm_flush_tlb_asid(struct kvm_vcpu *vcpu) +static void svm_flush_tlb_asid(struct kvm_vcpu *vcpu, struct kvm_vmcb_info= *vmcb) { struct vcpu_svm *svm =3D to_svm(vcpu); =20 @@ -3963,7 +3963,8 @@ static void svm_flush_tlb_asid(struct kvm_vcpu *vcpu) * A TLB flush for the current ASID flushes both "host" and "guest" TLB * entries, and thus is a superset of Hyper-V's fine grained flushing. */ - kvm_hv_vcpu_purge_flush_tlb(vcpu); + if (vmcb =3D=3D svm->current_vmcb) + kvm_hv_vcpu_purge_flush_tlb(vcpu); =20 /* * Flush only the current ASID even if the TLB flush was invoked via @@ -3973,14 +3974,15 @@ static void svm_flush_tlb_asid(struct kvm_vcpu *vcp= u) * VM-Exit (via kvm_mmu_reset_context()). */ if (static_cpu_has(X86_FEATURE_FLUSHBYASID)) - svm->vmcb->control.tlb_ctl =3D TLB_CONTROL_FLUSH_ASID; + vmcb->ptr->control.tlb_ctl =3D TLB_CONTROL_FLUSH_ASID; else - svm->current_vmcb->asid_generation--; + vmcb->asid_generation--; } =20 static void svm_flush_tlb_current(struct kvm_vcpu *vcpu) { hpa_t root_tdp =3D vcpu->arch.mmu->root.hpa; + struct vcpu_svm *svm =3D to_svm(vcpu); =20 /* * When running on Hyper-V with EnlightenedNptTlb enabled, explicitly @@ -3991,11 +3993,13 @@ static void svm_flush_tlb_current(struct kvm_vcpu *= vcpu) if (svm_hv_is_enlightened_tlb_enabled(vcpu) && VALID_PAGE(root_tdp)) hyperv_flush_guest_mapping(root_tdp); =20 - svm_flush_tlb_asid(vcpu); + svm_flush_tlb_asid(vcpu, svm->current_vmcb); } =20 static void svm_flush_tlb_all(struct kvm_vcpu *vcpu) { + struct vcpu_svm *svm =3D to_svm(vcpu); + /* * When running on Hyper-V with EnlightenedNptTlb enabled, remote TLB * flushes should be routed to hv_flush_remote_tlbs() without requesting @@ -4006,7 +4010,7 @@ static void svm_flush_tlb_all(struct kvm_vcpu *vcpu) if (WARN_ON_ONCE(svm_hv_is_enlightened_tlb_enabled(vcpu))) hv_flush_remote_tlbs(vcpu->kvm); =20 - svm_flush_tlb_asid(vcpu); + svm_flush_tlb_asid(vcpu, svm->current_vmcb); } =20 static void svm_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t gva) @@ -4016,6 +4020,13 @@ static void svm_flush_tlb_gva(struct kvm_vcpu *vcpu,= gva_t gva) invlpga(gva, svm->vmcb->control.asid); } =20 +static void svm_flush_tlb_guest(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm =3D to_svm(vcpu); + + svm_flush_tlb_asid(vcpu, svm->current_vmcb); +} + static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm =3D to_svm(vcpu); @@ -5055,7 +5066,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata =3D { .flush_tlb_all =3D svm_flush_tlb_all, .flush_tlb_current =3D svm_flush_tlb_current, .flush_tlb_gva =3D svm_flush_tlb_gva, - .flush_tlb_guest =3D svm_flush_tlb_asid, + .flush_tlb_guest =3D svm_flush_tlb_guest, =20 .vcpu_pre_run =3D svm_vcpu_pre_run, .vcpu_run =3D svm_vcpu_run, --=20 2.48.1.362.g079036d154-goog