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Therefore, the rationale behind issuing a +> wbinvd_on_all_cpus() in sev_guest_memory_reclaimed() should not apply +> for SNP guests and can be ignored. +> +> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> +> [mdr: Add some clarifications in commit] +> Signed-off-by: Michael Roth <michael.roth@amd.com> + +Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> + +> --- +> arch/x86/kvm/svm/sev.c | 9 ++++++++- +> 1 file changed, 8 insertions(+), 1 deletion(-) +> +> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c +> index 31f6f4786503..3e8de7cb3c89 100644 +> --- a/arch/x86/kvm/svm/sev.c +> +++ b/arch/x86/kvm/svm/sev.c +> @@ -2975,7 +2975,14 @@ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va) +> +> void sev_guest_memory_reclaimed(struct kvm *kvm) +> { +> - if (!sev_guest(kvm)) +> + /* +> + * With SNP+gmem, private/encrypted memory should be +> + * unreachable via the hva-based mmu notifiers. Additionally, +> + * for shared->private translations, H/W coherency will ensure +> + * first guest access to the page would clear out any existing +> + * dirty copies of that cacheline. +> + */ +> + if (!sev_guest(kvm) || sev_snp_guest(kvm)) +> return; +> +> wbinvd_on_all_cpus(); + + +X-sender: <linux-kernel+bounces-125896-steffen.klassert=secunet.com@vger.kernel.org> +X-Receiver: <steffen.klassert@secunet.com> ORCPT=rfc822;steffen.klassert@secunet.com NOTIFY=NEVER; X-ExtendedProps=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 +X-CreatedBy: MSExchange15 +X-HeloDomain: b.mx.secunet.com +X-ExtendedProps: BQBjAAoAtaNAQuxQ3AgFAGEACAABAAAABQA3AAIAAA8APAAAAE1pY3Jvc29mdC5FeGNoYW5nZS5UcmFuc3BvcnQuTWFpbFJlY2lwaWVudC5Pcmdhbml6YXRpb25TY29wZREAAAAAAAAAAAAAAAAAAAAAAAUASQACAAEFAGIACgBeAAAAo4oAAAUABAAUIAEAAAAcAAAAc3RlZmZlbi5rbGFzc2VydEBzZWN1bmV0LmNvbQUABgACAAEFACkAAgABDwAJAAAAQ0lBdWRpdGVkAgABBQACAAcAAQAAAAUAAwAHAAAAAAAFAAUAAgABBQBkAA8AAwAAAEh1Yg== +X-Source: SMTP:Default MBX-DRESDEN-01 +X-SourceIPAddress: 62.96.220.37 +X-EndOfInjectedXHeaders: 17913 +Received: from cas-essen-02.secunet.de (10.53.40.202) by + mbx-dresden-01.secunet.de (10.53.40.199) with Microsoft SMTP Server + (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id + 15.1.2507.37; 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Therefore, the rationale behind issuing a +> wbinvd_on_all_cpus() in sev_guest_memory_reclaimed() should not apply +> for SNP guests and can be ignored. +> +> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> +> [mdr: Add some clarifications in commit] +> Signed-off-by: Michael Roth <michael.roth@amd.com> + +Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> + +> --- +> arch/x86/kvm/svm/sev.c | 9 ++++++++- +> 1 file changed, 8 insertions(+), 1 deletion(-) +> +> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c +> index 31f6f4786503..3e8de7cb3c89 100644 +> --- a/arch/x86/kvm/svm/sev.c +> +++ b/arch/x86/kvm/svm/sev.c +> @@ -2975,7 +2975,14 @@ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va) +> +> void sev_guest_memory_reclaimed(struct kvm *kvm) +> { +> - if (!sev_guest(kvm)) +> + /* +> + * With SNP+gmem, private/encrypted memory should be +> + * unreachable via the hva-based mmu notifiers. Additionally, +> + * for shared->private translations, H/W coherency will ensure +> + * first guest access to the page would clear out any existing +> + * dirty copies of that cacheline. +> + */ +> + if (!sev_guest(kvm) || sev_snp_guest(kvm)) +> return; +> +> wbinvd_on_all_cpus(); diff --git a/a/content_digest b/N1/content_digest index 5fed2cc..e742063 100644 --- a/a/content_digest +++ b/N1/content_digest @@ -80,6 +80,595 @@ "> +\tif (!sev_guest(kvm) || sev_snp_guest(kvm))\n" "> \t\treturn;\n" "> \n" + "> \twbinvd_on_all_cpus();\n" + "\n" + "\n" + "X-sender: <kvm+bounces-13160-martin.weber=secunet.com@vger.kernel.org>\n" + "X-Receiver: <martin.weber@secunet.com> ORCPT=rfc822;martin.weber@secunet.com NOTIFY=NEVER; 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Therefore, the rationale behind issuing a\n" + "> wbinvd_on_all_cpus() in sev_guest_memory_reclaimed() should not apply\n" + "> for SNP guests and can be ignored.\n" + "> \n" + "> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>\n" + "> [mdr: Add some clarifications in commit]\n" + "> Signed-off-by: Michael Roth <michael.roth@amd.com>\n" + "\n" + "Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>\n" + "\n" + "> ---\n" + "> arch/x86/kvm/svm/sev.c | 9 ++++++++-\n" + "> 1 file changed, 8 insertions(+), 1 deletion(-)\n" + "> \n" + "> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c\n" + "> index 31f6f4786503..3e8de7cb3c89 100644\n" + "> --- a/arch/x86/kvm/svm/sev.c\n" + "> +++ b/arch/x86/kvm/svm/sev.c\n" + "> @@ -2975,7 +2975,14 @@ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va)\n" + "> \n" + "> void sev_guest_memory_reclaimed(struct kvm *kvm)\n" + "> {\n" + "> -\tif (!sev_guest(kvm))\n" + "> +\t/*\n" + "> +\t * With SNP+gmem, private/encrypted memory should be\n" + "> +\t * unreachable via the hva-based mmu notifiers. Additionally,\n" + "> +\t * for shared->private translations, H/W coherency will ensure\n" + "> +\t * first guest access to the page would clear out any existing\n" + "> +\t * dirty copies of that cacheline.\n" + "> +\t */\n" + "> +\tif (!sev_guest(kvm) || sev_snp_guest(kvm))\n" + "> \t\treturn;\n" + "> \n" + "> \twbinvd_on_all_cpus();\n" + "\n" + "\n" + "X-sender: <linux-kernel+bounces-125896-steffen.klassert=secunet.com@vger.kernel.org>\n" + "X-Receiver: <steffen.klassert@secunet.com> ORCPT=rfc822;steffen.klassert@secunet.com NOTIFY=NEVER; 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Mozilla Thunderbird\n" + "Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU\n" + " notifications for SNP\n" + "To: Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org\n" + "Cc: linux-coco@lists.linux.dev, linux-mm@kvack.org,\n" + " linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org,\n" + " tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de,\n" + " thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, seanjc@google.com,\n" + " vkuznets@redhat.com, jmattson@google.com, luto@kernel.org,\n" + " dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com,\n" + " peterz@infradead.org, srinivas.pandruvada@linux.intel.com,\n" + " rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com, bp@alien8.de,\n" + " vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com,\n" + " tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com,\n" + " alpergun@google.com, jarkko@kernel.org, ashish.kalra@amd.com,\n" + " 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Therefore, the rationale behind issuing a\n" + "> wbinvd_on_all_cpus() in sev_guest_memory_reclaimed() should not apply\n" + "> for SNP guests and can be ignored.\n" + "> \n" + "> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>\n" + "> [mdr: Add some clarifications in commit]\n" + "> Signed-off-by: Michael Roth <michael.roth@amd.com>\n" + "\n" + "Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>\n" + "\n" + "> ---\n" + "> arch/x86/kvm/svm/sev.c | 9 ++++++++-\n" + "> 1 file changed, 8 insertions(+), 1 deletion(-)\n" + "> \n" + "> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c\n" + "> index 31f6f4786503..3e8de7cb3c89 100644\n" + "> --- a/arch/x86/kvm/svm/sev.c\n" + "> +++ b/arch/x86/kvm/svm/sev.c\n" + "> @@ -2975,7 +2975,14 @@ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va)\n" + "> \n" + "> void sev_guest_memory_reclaimed(struct kvm *kvm)\n" + "> {\n" + "> -\tif (!sev_guest(kvm))\n" + "> +\t/*\n" + "> +\t * With SNP+gmem, private/encrypted memory should be\n" + "> +\t * unreachable via the hva-based mmu notifiers. Additionally,\n" + "> +\t * for shared->private translations, H/W coherency will ensure\n" + "> +\t * first guest access to the page would clear out any existing\n" + "> +\t * dirty copies of that cacheline.\n" + "> +\t */\n" + "> +\tif (!sev_guest(kvm) || sev_snp_guest(kvm))\n" + "> \t\treturn;\n" + "> \n" "> \twbinvd_on_all_cpus();" -22a204b496adc11afbd0076320671868fab7b410940cf2c9f303646f95abad3d +6b6858c7909467d3ded3cc917614578ed22d1d5f17adcf1875123d0875a92923
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