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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part2 RFC v4 27/40] KVM: X86: Add kvm_x86_ops to get the max page level for the TDP Date: Wed, 7 Jul 2021 13:36:03 -0500 Message-Id: <20210707183616.5620-28-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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The TDP page level is checked against the page level programmed in the RMP entry. If the page level does not match, then it will cause a nested page fault with the RMP bit set to indicate the RMP violation. To keep the TDP and RMP page level's in sync, the KVM fault handle kvm_handle_page_fault() will call get_tdp_max_page_level() to get the maximum allowed page level so that it can limit the TDP level. In the case of SEV-SNP guest, the get_tdp_max_page_level() will consult the RMP table to compute the maximum allowed page level for a given GPA. Signed-off-by: Brijesh Singh --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/mmu/mmu.c | 6 ++++-- arch/x86/kvm/svm/sev.c | 20 ++++++++++++++++++++ arch/x86/kvm/svm/svm.c | 1 + arch/x86/kvm/svm/svm.h | 1 + arch/x86/kvm/vmx/vmx.c | 8 ++++++++ 6 files changed, 35 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 188110ab2c02..cd2e19e1d323 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1384,6 +1384,7 @@ struct kvm_x86_ops { void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector); void *(*alloc_apic_backing_page)(struct kvm_vcpu *vcpu); + int (*get_tdp_max_page_level)(struct kvm_vcpu *vcpu, gpa_t gpa, int max_level); }; struct kvm_x86_nested_ops { diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 0144c40d09c7..7991ffae7b31 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3781,11 +3781,13 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, bool prefault) { + int max_level = kvm_x86_ops.get_tdp_max_page_level(vcpu, gpa, PG_LEVEL_2M); + pgprintk("%s: gva %lx error %x\n", __func__, gpa, error_code); /* This path builds a PAE pagetable, we can map 2mb pages at maximum. */ return direct_page_fault(vcpu, gpa & PAGE_MASK, error_code, prefault, - PG_LEVEL_2M, false); + max_level, false); } int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code, @@ -3826,7 +3828,7 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, { int max_level; - for (max_level = KVM_MAX_HUGEPAGE_LEVEL; + for (max_level = kvm_x86_ops.get_tdp_max_page_level(vcpu, gpa, KVM_MAX_HUGEPAGE_LEVEL); max_level > PG_LEVEL_4K; max_level--) { int page_num = KVM_PAGES_PER_HPAGE(max_level); diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 3f8824c9a5dc..fd2d00ad80b7 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3206,3 +3206,23 @@ struct page *snp_safe_alloc_page(struct kvm_vcpu *vcpu) return pfn_to_page(pfn); } + +int sev_get_tdp_max_page_level(struct kvm_vcpu *vcpu, gpa_t gpa, int max_level) +{ + struct rmpentry *e; + kvm_pfn_t pfn; + int level; + + if (!sev_snp_guest(vcpu->kvm)) + return max_level; + + pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); + if (is_error_noslot_pfn(pfn)) + return max_level; + + e = snp_lookup_page_in_rmptable(pfn_to_page(pfn), &level); + if (unlikely(!e)) + return max_level; + + return min_t(uint32_t, level, max_level); +} diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index a7adf6ca1713..2632eae52aa3 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4576,6 +4576,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = { .vcpu_deliver_sipi_vector = svm_vcpu_deliver_sipi_vector, .alloc_apic_backing_page = svm_alloc_apic_backing_page, + .get_tdp_max_page_level = sev_get_tdp_max_page_level, }; static struct kvm_x86_init_ops svm_init_ops __initdata = { diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index bc5582b44356..32abcbd774d0 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -568,6 +568,7 @@ void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector); void sev_es_prepare_guest_switch(struct vcpu_svm *svm, unsigned int cpu); void sev_es_unmap_ghcb(struct vcpu_svm *svm); struct page *snp_safe_alloc_page(struct kvm_vcpu *vcpu); +int sev_get_tdp_max_page_level(struct kvm_vcpu *vcpu, gpa_t gpa, int max_level); /* vmenter.S */ diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4bceb5ca3a89..fbc9034edf16 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7612,6 +7612,12 @@ static bool vmx_check_apicv_inhibit_reasons(ulong bit) return supported & BIT(bit); } + +static int vmx_get_tdp_max_page_level(struct kvm_vcpu *vcpu, gpa_t gpa, int max_level) +{ + return max_level; +} + static struct kvm_x86_ops vmx_x86_ops __initdata = { .hardware_unsetup = hardware_unsetup, @@ -7742,6 +7748,8 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { .complete_emulated_msr = kvm_complete_insn_gp, .vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector, + + .get_tdp_max_page_level = vmx_get_tdp_max_page_level, }; static __init void vmx_setup_user_return_msrs(void) -- 2.17.1