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Date: Sat, 30 Mar 2024 22:35:33 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc: linux-coco@...ts.linux.dev, linux-mm@...ck.org,
linux-crypto@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
tglx@...utronix.de, mingo@...hat.com, jroedel@...e.de,
thomas.lendacky@....com, hpa@...or.com, ardb@...nel.org, seanjc@...gle.com,
vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
tony.luck@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
alpergun@...gle.com, jarkko@...nel.org, ashish.kalra@....com,
nikunj.dadhania@....com, pankaj.gupta@....com, liam.merwick@...cle.com
Subject: Re: [PATCH v12 24/29] KVM: SEV: Avoid WBINVD for HVA-based MMU
notifications for SNP
On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@....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@....com>
> [mdr: Add some clarifications in commit]
> Signed-off-by: Michael Roth <michael.roth@....com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.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@....com>, kvm@...r.kernel.org
Cc: linux-coco@...ts.linux.dev, linux-mm@...ck.org,
linux-crypto@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
tglx@...utronix.de, mingo@...hat.com, jroedel@...e.de,
thomas.lendacky@....com, hpa@...or.com, ardb@...nel.org, seanjc@...gle.com,
vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
tony.luck@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
alpergun@...gle.com, jarkko@...nel.org, ashish.kalra@....com,
nikunj.dadhania@....com, pankaj.gupta@....com, liam.merwick@...cle.com
References: <20240329225835.400662-1-michael.roth@....com>
<20240329225835.400662-25-michael.roth@....com>
From: Paolo Bonzini <pbonzini@...hat.com>
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On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@....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@....com>
> [mdr: Add some clarifications in commit]
> Signed-off-by: Michael Roth <michael.roth@....com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.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@....com>, kvm@...r.kernel.org
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On 3/29/24 23:58, Michael Roth wrote:
> From: Ashish Kalra <ashish.kalra@....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@....com>
> [mdr: Add some clarifications in commit]
> Signed-off-by: Michael Roth <michael.roth@....com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.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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