From: Paolo Bonzini <pbonzini@redhat.com>
To: Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org
Cc: linux-coco@lists.linux.dev, linux-mm@kvack.org,
linux-crypto@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com,
hpa@zytor.com, ardb@kernel.org, seanjc@google.com,
vkuznets@redhat.com, jmattson@google.com, luto@kernel.org,
dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com,
peterz@infradead.org, srinivas.pandruvada@linux.intel.com,
rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com,
bp@alien8.de, vbabka@suse.cz, kirill@shutemov.name,
ak@linux.intel.com, tony.luck@intel.com,
sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com,
jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com,
pankaj.gupta@amd.com, liam.merwick@oracle.com
Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU notifications for SNP
Date: Sat, 30 Mar 2024 22:35:33 +0100 [thread overview]
Message-ID: <00800f4b-5403-4416-b984-12b207362a19@redhat.com> (raw)
In-Reply-To: <20240329225835.400662-25-michael.roth@amd.com>
On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> With SNP/guest_memfd, private/encrypted memory should not be mappable,
> and MMU notifications for HVA-mapped memory will only be relevant to
> unencrypted guest memory. 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();
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org
Cc: linux-coco@lists.linux.dev, linux-mm@kvack.org,
linux-crypto@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com,
hpa@zytor.com, ardb@kernel.org, seanjc@google.com,
vkuznets@redhat.com, jmattson@google.com, luto@kernel.org,
dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com,
peterz@infradead.org, srinivas.pandruvada@linux.intel.com,
rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com,
bp@alien8.de, vbabka@suse.cz, kirill@shutemov.name,
ak@linux.intel.com, tony.luck@intel.com,
sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com,
jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com,
pankaj.gupta@amd.com, liam.merwick@oracle.com
Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU notifications for SNP
Date: Sat, 30 Mar 2024 22:35:33 +0100 [thread overview]
Message-ID: <00800f4b-5403-4416-b984-12b207362a19@redhat.com> (raw)
Message-ID: <20240330213533.a2hYx5CUZ9Pe08yRdhRXjtItHV8Xrc8YdRI9CHWpKSM@z> (raw)
In-Reply-To: <20240329225835.400662-25-michael.roth@amd.com>
On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> With SNP/guest_memfd, private/encrypted memory should not be mappable,
> and MMU notifications for HVA-mapped memory will only be relevant to
> unencrypted guest memory. 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();
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Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU
notifications for SNP
To: Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org
Cc: linux-coco@lists.linux.dev, linux-mm@kvack.org,
linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de,
thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, seanjc@google.com,
vkuznets@redhat.com, jmattson@google.com, luto@kernel.org,
dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com,
peterz@infradead.org, srinivas.pandruvada@linux.intel.com,
rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com, bp@alien8.de,
vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com,
tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com,
alpergun@google.com, jarkko@kernel.org, ashish.kalra@amd.com,
nikunj.dadhania@amd.com, pankaj.gupta@amd.com, liam.merwick@oracle.com
References: <20240329225835.400662-1-michael.roth@amd.com>
<20240329225835.400662-25-michael.roth@amd.com>
From: Paolo Bonzini <pbonzini@redhat.com>
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On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> With SNP/guest_memfd, private/encrypted memory should not be mappable,
> and MMU notifications for HVA-mapped memory will only be relevant to
> unencrypted guest memory. 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();
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Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU
notifications for SNP
To: Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org
Cc: linux-coco@lists.linux.dev, linux-mm@kvack.org,
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References: <20240329225835.400662-1-michael.roth@amd.com>
<20240329225835.400662-25-michael.roth@amd.com>
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On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> With SNP/guest_memfd, private/encrypted memory should not be mappable,
> and MMU notifications for HVA-mapped memory will only be relevant to
> unencrypted guest memory. 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();
next prev parent reply other threads:[~2024-03-30 21:35 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-29 22:58 [PATCH v12 00/29] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 01/29] [TEMP] x86/kvm/Kconfig: Have KVM_AMD_SEV select ARCH_HAS_CC_PLATFORM Michael Roth
2024-03-29 22:58 ` [PATCH v12 02/29] [TEMP] x86/cc: Add cc_platform_set/_clear() helpers Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 03/29] [TEMP] x86/CPU/AMD: Track SNP host status with cc_platform_*() Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 04/29] [TEMP] fixup! KVM: SEV: sync FPU and AVX state at LAUNCH_UPDATE_VMSA time Michael Roth
2024-03-29 22:58 ` [PATCH v12 05/29] KVM: x86: Define RMP page fault error bits for #NPF Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 19:28 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 06/29] KVM: SEV: Select KVM_GENERIC_PRIVATE_MEM when CONFIG_KVM_AMD_SEV=y Michael Roth
2024-03-29 22:58 ` [PATCH v12 07/29] KVM: SEV: Add support to handle AP reset MSR protocol Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 08/29] KVM: SEV: Add GHCB handling for Hypervisor Feature Support requests Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 09/29] KVM: SEV: Add initial SEV-SNP support Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 19:58 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 10/29] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_START command Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 20:20 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 11/29] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_UPDATE command Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 20:31 ` Paolo Bonzini
2024-04-01 22:22 ` Michael Roth
2024-04-02 22:58 ` Isaku Yamahata
2024-04-03 12:51 ` Paolo Bonzini
2024-04-03 15:37 ` Isaku Yamahata
2024-04-04 16:03 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 12/29] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_FINISH command Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 20:41 ` Paolo Bonzini
2024-04-01 23:17 ` Michael Roth
2024-04-03 12:56 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 13/29] KVM: SEV: Add support to handle GHCB GPA register VMGEXIT Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 14/29] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT Michael Roth
2024-03-29 22:58 ` [PATCH v12 15/29] KVM: SEV: Add support to handle " Michael Roth
2024-03-29 22:58 ` [PATCH v12 16/29] KVM: x86: Export the kvm_zap_gfn_range() for the SNP use Michael Roth
2024-03-30 20:51 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 17/29] KVM: SEV: Add support to handle RMP nested page faults Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 20:55 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 18/29] KVM: SEV: Use a VMSA physical address variable for populating VMCB Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 21:01 ` Paolo Bonzini
2024-04-16 11:53 ` Paolo Bonzini
2024-04-16 14:25 ` Tom Lendacky
2024-04-16 17:00 ` Paolo Bonzini
2024-04-17 20:57 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 19/29] KVM: SEV: Support SEV-SNP AP Creation NAE event Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 20/29] KVM: SEV: Add support for GHCB-based termination requests Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 21/29] KVM: SEV: Implement gmem hook for initializing private pages Michael Roth
2024-03-30 21:05 ` Paolo Bonzini
2024-03-30 21:05 ` Paolo Bonzini
2024-03-30 21:05 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 22/29] KVM: SEV: Implement gmem hook for invalidating " Michael Roth
2024-03-30 21:31 ` Paolo Bonzini
2024-03-30 21:31 ` Paolo Bonzini
2024-03-30 21:31 ` Paolo Bonzini
2024-04-18 19:57 ` Michael Roth
2024-03-29 22:58 ` [PATCH v12 23/29] KVM: x86: Implement gmem hook for determining max NPT mapping level Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-30 21:35 ` Paolo Bonzini
2024-03-30 21:35 ` Paolo Bonzini
2024-03-30 21:35 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU notifications for SNP Michael Roth
2024-03-30 21:35 ` Paolo Bonzini [this message]
2024-03-30 21:35 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 25/29] KVM: SVM: Add module parameter to enable the SEV-SNP Michael Roth
2024-03-30 21:35 ` Paolo Bonzini
2024-03-30 21:35 ` Paolo Bonzini
2024-03-29 22:58 ` [PATCH v12 26/29] KVM: SEV: Provide support for SNP_GUEST_REQUEST NAE event Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-04-10 22:14 ` Tom Lendacky
2024-03-29 22:58 ` [PATCH v12 27/29] crypto: ccp: Add the SNP_VLEK_LOAD command Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-04-10 22:20 ` Tom Lendacky
2024-03-29 22:58 ` [PATCH v12 28/29] crypto: ccp: Add the SNP_{PAUSE,RESUME}_ATTESTATION commands Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-04-10 22:27 ` Tom Lendacky
2024-03-29 22:58 ` [PATCH v12 29/29] KVM: SEV: Provide support for SNP_EXTENDED_GUEST_REQUEST NAE event Michael Roth
2024-03-29 22:58 ` Michael Roth
2024-04-11 13:33 ` Tom Lendacky
2024-03-30 21:44 ` [PATCH v12 00/29] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Paolo Bonzini
2024-03-30 21:44 ` Paolo Bonzini
2024-03-30 21:44 ` Paolo Bonzini
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