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Thu, 08 Dec 2022 11:39:23 -0800 (PST) Date: Thu, 8 Dec 2022 11:38:30 -0800 In-Reply-To: <20221208193857.4090582-1-dmatlack@google.com> Mime-Version: 1.0 References: <20221208193857.4090582-1-dmatlack@google.com> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog Message-ID: <20221208193857.4090582-11-dmatlack@google.com> Subject: [RFC PATCH 10/37] KVM: MMU: Move struct kvm_page_fault to common code From: David Matlack To: Paolo Bonzini Cc: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Huacai Chen , Aleksandar Markovic , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Andrew Morton , David Matlack , Anshuman Khandual , Nadav Amit , "Matthew Wilcox (Oracle)" , Vlastimil Babka , "Liam R. Howlett" , Suren Baghdasaryan , Peter Xu , xu xin , Arnd Bergmann , Yu Zhao , Colin Cross , Hugh Dickins , Ben Gardon , Mingwei Zhang , Krish Sadhukhan , Ricardo Koller , Jing Zhang , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221208_193924_580773_8F2B34A9 X-CRM114-Status: GOOD ( 24.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Move struct kvm_page_fault to common code. This will be used in a future commit to move the TDP MMU to common code. No functional change intended. Signed-off-by: David Matlack --- arch/x86/include/asm/kvm/mmu_types.h | 20 +++++++ arch/x86/kvm/mmu/mmu.c | 19 +++---- arch/x86/kvm/mmu/mmu_internal.h | 79 ++++++---------------------- arch/x86/kvm/mmu/mmutrace.h | 2 +- arch/x86/kvm/mmu/paging_tmpl.h | 14 ++--- arch/x86/kvm/mmu/tdp_mmu.c | 6 +-- include/kvm/mmu_types.h | 44 ++++++++++++++++ 7 files changed, 100 insertions(+), 84 deletions(-) diff --git a/arch/x86/include/asm/kvm/mmu_types.h b/arch/x86/include/asm/kvm/mmu_types.h index affcb520b482..59d1be85f4b7 100644 --- a/arch/x86/include/asm/kvm/mmu_types.h +++ b/arch/x86/include/asm/kvm/mmu_types.h @@ -5,6 +5,7 @@ #include #include #include +#include /* * This is a subset of the overall kvm_cpu_role to minimize the size of @@ -115,4 +116,23 @@ struct kvm_mmu_page_arch { atomic_t write_flooding_count; }; +struct kvm_page_fault_arch { + const u32 error_code; + + /* x86-specific error code bits */ + const bool present; + const bool rsvd; + const bool user; + + /* Derived from mmu and global state. */ + const bool is_tdp; + const bool nx_huge_page_workaround_enabled; + + /* + * Whether a >4KB mapping can be created or is forbidden due to NX + * hugepages. + */ + bool huge_page_disallowed; +}; + #endif /* !__ASM_KVM_MMU_TYPES_H */ diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index e47f35878ab5..0593d4a60139 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3092,7 +3092,8 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault struct kvm_memory_slot *slot = fault->slot; kvm_pfn_t mask; - fault->huge_page_disallowed = fault->exec && fault->nx_huge_page_workaround_enabled; + fault->arch.huge_page_disallowed = + fault->exec && fault->arch.nx_huge_page_workaround_enabled; if (unlikely(fault->max_level == PG_LEVEL_4K)) return; @@ -3109,7 +3110,7 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault */ fault->req_level = kvm_mmu_max_mapping_level(vcpu->kvm, slot, fault->gfn, fault->max_level); - if (fault->req_level == PG_LEVEL_4K || fault->huge_page_disallowed) + if (fault->req_level == PG_LEVEL_4K || fault->arch.huge_page_disallowed) return; /* @@ -3158,7 +3159,7 @@ static int direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) * We cannot overwrite existing page tables with an NX * large page, as the leaf could be executable. */ - if (fault->nx_huge_page_workaround_enabled) + if (fault->arch.nx_huge_page_workaround_enabled) disallowed_hugepage_adjust(fault, *it.sptep, it.level); base_gfn = fault->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1); @@ -3170,7 +3171,7 @@ static int direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) continue; link_shadow_page(vcpu, it.sptep, sp); - if (fault->huge_page_disallowed) + if (fault->arch.huge_page_disallowed) account_nx_huge_page(vcpu->kvm, sp, fault->req_level >= it.level); } @@ -3221,7 +3222,7 @@ static int kvm_handle_noslot_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, unsigned int access) { - gva_t gva = fault->is_tdp ? 0 : fault->addr; + gva_t gva = fault->arch.is_tdp ? 0 : fault->addr; vcpu_cache_mmio_info(vcpu, gva, fault->gfn, access & shadow_mmio_access_mask); @@ -3255,7 +3256,7 @@ static bool page_fault_can_be_fast(struct kvm_page_fault *fault) * generation number. Refreshing the MMIO generation needs to go down * the slow path. Note, EPT Misconfigs do NOT set the PRESENT flag! */ - if (fault->rsvd) + if (fault->arch.rsvd) return false; /* @@ -3273,7 +3274,7 @@ static bool page_fault_can_be_fast(struct kvm_page_fault *fault) * SPTE is MMU-writable (determined later), the fault can be fixed * by setting the Writable bit, which can be done out of mmu_lock. */ - if (!fault->present) + if (!fault->arch.present) return !kvm_ad_enabled(); /* @@ -4119,10 +4120,10 @@ static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct) static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) { - if (unlikely(fault->rsvd)) + if (unlikely(fault->arch.rsvd)) return false; - if (!fault->present || !fault->write) + if (!fault->arch.present || !fault->write) return false; /* diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index af2ae4887e35..4abb80a3bd01 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -77,60 +77,6 @@ static inline bool is_nx_huge_page_enabled(struct kvm *kvm) return READ_ONCE(nx_huge_pages) && !kvm->arch.disable_nx_huge_pages; } -struct kvm_page_fault { - /* arguments to kvm_mmu_do_page_fault. */ - const gpa_t addr; - const u32 error_code; - const bool prefetch; - - /* Derived from error_code. */ - const bool exec; - const bool write; - const bool present; - const bool rsvd; - const bool user; - - /* Derived from mmu and global state. */ - const bool is_tdp; - const bool nx_huge_page_workaround_enabled; - - /* - * Whether a >4KB mapping can be created or is forbidden due to NX - * hugepages. - */ - bool huge_page_disallowed; - - /* - * Maximum page size that can be created for this fault; input to - * FNAME(fetch), direct_map() and kvm_tdp_mmu_map(). - */ - u8 max_level; - - /* - * Page size that can be created based on the max_level and the - * page size used by the host mapping. - */ - u8 req_level; - - /* - * Page size that will be created based on the req_level and - * huge_page_disallowed. - */ - u8 goal_level; - - /* Shifted addr, or result of guest page table walk if addr is a gva. */ - gfn_t gfn; - - /* The memslot containing gfn. May be NULL. */ - struct kvm_memory_slot *slot; - - /* Outputs of kvm_faultin_pfn. */ - unsigned long mmu_seq; - kvm_pfn_t pfn; - hva_t hva; - bool map_writable; -}; - int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault); /* @@ -164,22 +110,27 @@ enum { static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u32 err, bool prefetch) { + bool is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault); struct kvm_page_fault fault = { .addr = cr2_or_gpa, - .error_code = err, - .exec = err & PFERR_FETCH_MASK, - .write = err & PFERR_WRITE_MASK, - .present = err & PFERR_PRESENT_MASK, - .rsvd = err & PFERR_RSVD_MASK, - .user = err & PFERR_USER_MASK, .prefetch = prefetch, - .is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault), - .nx_huge_page_workaround_enabled = - is_nx_huge_page_enabled(vcpu->kvm), + + .write = err & PFERR_WRITE_MASK, + .exec = err & PFERR_FETCH_MASK, .max_level = KVM_MAX_HUGEPAGE_LEVEL, .req_level = PG_LEVEL_4K, .goal_level = PG_LEVEL_4K, + + .arch = { + .error_code = err, + .present = err & PFERR_PRESENT_MASK, + .rsvd = err & PFERR_RSVD_MASK, + .user = err & PFERR_USER_MASK, + .is_tdp = is_tdp, + .nx_huge_page_workaround_enabled = + is_nx_huge_page_enabled(vcpu->kvm), + }, }; int r; @@ -196,7 +147,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, if (!prefetch) vcpu->stat.pf_taken++; - if (IS_ENABLED(CONFIG_RETPOLINE) && fault.is_tdp) + if (IS_ENABLED(CONFIG_RETPOLINE) && fault.arch.is_tdp) r = kvm_tdp_page_fault(vcpu, &fault); else r = vcpu->arch.mmu->page_fault(vcpu, &fault); diff --git a/arch/x86/kvm/mmu/mmutrace.h b/arch/x86/kvm/mmu/mmutrace.h index 335f26dabdf3..b01767acf073 100644 --- a/arch/x86/kvm/mmu/mmutrace.h +++ b/arch/x86/kvm/mmu/mmutrace.h @@ -270,7 +270,7 @@ TRACE_EVENT( TP_fast_assign( __entry->vcpu_id = vcpu->vcpu_id; __entry->cr2_or_gpa = fault->addr; - __entry->error_code = fault->error_code; + __entry->error_code = fault->arch.error_code; __entry->sptep = sptep; __entry->old_spte = old_spte; __entry->new_spte = *sptep; diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index 18bb92b70a01..daf9c7731edc 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -698,7 +698,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, * We cannot overwrite existing page tables with an NX * large page, as the leaf could be executable. */ - if (fault->nx_huge_page_workaround_enabled) + if (fault->arch.nx_huge_page_workaround_enabled) disallowed_hugepage_adjust(fault, *it.sptep, it.level); base_gfn = fault->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1); @@ -713,7 +713,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, continue; link_shadow_page(vcpu, it.sptep, sp); - if (fault->huge_page_disallowed) + if (fault->arch.huge_page_disallowed) account_nx_huge_page(vcpu->kvm, sp, fault->req_level >= it.level); } @@ -793,8 +793,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault int r; bool is_self_change_mapping; - pgprintk("%s: addr %lx err %x\n", __func__, fault->addr, fault->error_code); - WARN_ON_ONCE(fault->is_tdp); + pgprintk("%s: addr %lx err %x\n", __func__, fault->addr, fault->arch.error_code); + WARN_ON_ONCE(fault->arch.is_tdp); /* * Look up the guest pte for the faulting address. @@ -802,7 +802,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault * The bit needs to be cleared before walking guest page tables. */ r = FNAME(walk_addr)(&walker, vcpu, fault->addr, - fault->error_code & ~PFERR_RSVD_MASK); + fault->arch.error_code & ~PFERR_RSVD_MASK); /* * The page is not mapped by the guest. Let the guest handle it. @@ -830,7 +830,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault vcpu->arch.write_fault_to_shadow_pgtable = false; is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu, - &walker, fault->user, &vcpu->arch.write_fault_to_shadow_pgtable); + &walker, fault->arch.user, &vcpu->arch.write_fault_to_shadow_pgtable); if (is_self_change_mapping) fault->max_level = PG_LEVEL_4K; @@ -846,7 +846,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault * we will cache the incorrect access into mmio spte. */ if (fault->write && !(walker.pte_access & ACC_WRITE_MASK) && - !is_cr0_wp(vcpu->arch.mmu) && !fault->user && fault->slot) { + !is_cr0_wp(vcpu->arch.mmu) && !fault->arch.user && fault->slot) { walker.pte_access |= ACC_WRITE_MASK; walker.pte_access &= ~ACC_USER_MASK; diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 66231c7ed31e..4940413d3767 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -1156,7 +1156,7 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) tdp_mmu_for_each_pte(iter, mmu, fault->gfn, fault->gfn + 1) { int r; - if (fault->nx_huge_page_workaround_enabled) + if (fault->arch.nx_huge_page_workaround_enabled) disallowed_hugepage_adjust(fault, iter.old_spte, iter.level); if (iter.level == fault->goal_level) @@ -1181,7 +1181,7 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) sp = tdp_mmu_alloc_sp(vcpu); tdp_mmu_init_child_sp(sp, &iter); - sp->arch.nx_huge_page_disallowed = fault->huge_page_disallowed; + sp->arch.nx_huge_page_disallowed = fault->arch.huge_page_disallowed; if (is_shadow_present_pte(iter.old_spte)) r = tdp_mmu_split_huge_page(kvm, &iter, sp, true); @@ -1197,7 +1197,7 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) goto retry; } - if (fault->huge_page_disallowed && + if (fault->arch.huge_page_disallowed && fault->req_level >= iter.level) { spin_lock(&kvm->arch.tdp_mmu_pages_lock); track_possible_nx_huge_page(kvm, sp); diff --git a/include/kvm/mmu_types.h b/include/kvm/mmu_types.h index a9da33d4baa8..9f0ca920bf68 100644 --- a/include/kvm/mmu_types.h +++ b/include/kvm/mmu_types.h @@ -66,4 +66,48 @@ struct kvm_mmu_page { struct kvm_mmu_page_arch arch; }; +struct kvm_page_fault { + /* The raw faulting address. */ + const gpa_t addr; + + /* Whether the fault was synthesized to prefetch a mapping. */ + const bool prefetch; + + /* Information about the cause of the fault. */ + const bool write; + const bool exec; + + /* Shifted addr, or result of guest page table walk if shadow paging. */ + gfn_t gfn; + + /* The memslot that contains @gfn. May be NULL. */ + struct kvm_memory_slot *slot; + + /* Maximum page size that can be created for this fault. */ + u8 max_level; + + /* + * Page size that can be created based on the max_level and the page + * size used by the host mapping. + */ + u8 req_level; + + /* Final page size that will be created. */ + u8 goal_level; + + /* + * The value of kvm->mmu_invalidate_seq before fetching the host + * mapping. Used to verify that the host mapping has not changed + * after grabbing the MMU lock. + */ + unsigned long mmu_seq; + + /* Information about the host mapping. */ + kvm_pfn_t pfn; + hva_t hva; + bool map_writable; + + struct kvm_page_fault_arch arch; +}; + #endif /* !__KVM_MMU_TYPES_H */