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Sat, 30 Mar 2024 14:35:22 -0700 (PDT) Received: from [192.168.10.4] ([151.95.49.219]) by smtp.googlemail.com with ESMTPSA id cy14-20020a0564021c8e00b0056bf31fa2a3sm3688481edb.80.2024.03.30.14.35.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 30 Mar 2024 14:35:21 -0700 (PDT) Message-ID: <4e89479a-e170-403a-b2eb-ce7b895e55a3@redhat.com> Date: Sat, 30 Mar 2024 22:35:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 23/29] KVM: x86: Implement gmem hook for determining max NPT mapping level To: Michael Roth , 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> <20240329225835.400662-24-michael.roth@amd.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 2C183180012 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: i78j4d5m5o414s89sxyyfkoti6deq7nw X-HE-Tag: 1711834529-415167 X-HE-Meta: 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 RZwrJxuC 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/29/24 23:58, Michael Roth wrote: > In the case of SEV-SNP, whether or not a 2MB page can be mapped via a > 2MB mapping in the guest's nested page table depends on whether or not > any subpages within the range have already been initialized as private > in the RMP table. The existing mixed-attribute tracking in KVM is > insufficient here, for instance: > > - gmem allocates 2MB page > - guest issues PVALIDATE on 2MB page > - guest later converts a subpage to shared > - SNP host code issues PSMASH to split 2MB RMP mapping to 4K > - KVM MMU splits NPT mapping to 4K > - guest later converts that shared page back to private > > At this point there are no mixed attributes, and KVM would normally > allow for 2MB NPT mappings again, but this is actually not allowed > because the RMP table mappings are 4K and cannot be promoted on the > hypervisor side, so the NPT mappings must still be limited to 4K to > match this. > > Implement a kvm_x86_ops.gmem_validate_fault() hook for SEV that checks > for this condition and adjusts the mapping level accordingly. > > Signed-off-by: Michael Roth Reviewed-by: Paolo Bonzini > --- > arch/x86/kvm/svm/sev.c | 32 ++++++++++++++++++++++++++++++++ > arch/x86/kvm/svm/svm.c | 1 + > arch/x86/kvm/svm/svm.h | 7 +++++++ > 3 files changed, 40 insertions(+) > > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c > index 87d621d013a4..31f6f4786503 100644 > --- a/arch/x86/kvm/svm/sev.c > +++ b/arch/x86/kvm/svm/sev.c > @@ -4443,3 +4443,35 @@ void sev_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end) > pfn += use_2m_update ? PTRS_PER_PMD : 1; > } > } > + > +/* > + * Re-check whether an #NPF for a private/gmem page can still be serviced, and > + * adjust maximum mapping level if needed. > + */ > +int sev_gmem_validate_fault(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, bool is_private, > + u8 *max_level) > +{ > + int level, rc; > + bool assigned; > + > + if (!sev_snp_guest(kvm)) > + return 0; > + > + rc = snp_lookup_rmpentry(pfn, &assigned, &level); > + if (rc) { > + pr_err_ratelimited("SEV: RMP entry not found: GFN %llx PFN %llx level %d error %d\n", > + gfn, pfn, level, rc); > + return -ENOENT; > + } > + > + if (!assigned) { > + pr_err_ratelimited("SEV: RMP entry is not assigned: GFN %llx PFN %llx level %d\n", > + gfn, pfn, level); > + return -EINVAL; > + } > + > + if (level < *max_level) > + *max_level = level; > + > + return 0; > +} > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c > index b456906f2670..298b4ce77a5f 100644 > --- a/arch/x86/kvm/svm/svm.c > +++ b/arch/x86/kvm/svm/svm.c > @@ -5081,6 +5081,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = { > > .gmem_prepare = sev_gmem_prepare, > .gmem_invalidate = sev_gmem_invalidate, > + .gmem_validate_fault = sev_gmem_validate_fault, > }; > > /* > diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h > index 3f1f6d3d3ade..746f819a6de4 100644 > --- a/arch/x86/kvm/svm/svm.h > +++ b/arch/x86/kvm/svm/svm.h > @@ -732,6 +732,8 @@ void sev_vcpu_unblocking(struct kvm_vcpu *vcpu); > void sev_snp_init_protected_guest_state(struct kvm_vcpu *vcpu); > int sev_gmem_prepare(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, int max_order); > void sev_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end); > +int sev_gmem_validate_fault(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, bool is_private, > + u8 *max_level); > #else > static inline struct page *snp_safe_alloc_page(struct kvm_vcpu *vcpu) { > return alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); > @@ -753,6 +755,11 @@ static inline int sev_gmem_prepare(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, in > return 0; > } > static inline void sev_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end) {} > +static inline int sev_gmem_validate_fault(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, > + bool is_private, u8 *max_level) > +{ > + return 0; > +} > > #endif >