[09/15] KVM: x86/mmu: Introduce status parameter to page walker

Message ID	20240910152207.38974-10-nikwip@amazon.de (mailing list archive)
State	New, archived
Headers	show Received: from smtp-fw-9106.amazon.com (smtp-fw-9106.amazon.com [207.171.188.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5CC641A2551; Tue, 10 Sep 2024 15:24:55 +0000 (UTC) From: Nikolas Wipper <nikwip@amazon.de> To: Paolo Bonzini <pbonzini@redhat.com>, Sean Christopherson <seanjc@google.com>, Vitaly Kuznetsov <vkuznets@redhat.com> CC: Nicolas Saenz Julienne <nsaenz@amazon.com>, Alexander Graf <graf@amazon.de>, James Gowans <jgowans@amazon.com>, <nh-open-source@amazon.com>, Thomas Gleixner <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>, <x86@kernel.org>, <linux-doc@vger.kernel.org>, <linux-kselftest@vger.kernel.org>, <kvmarm@lists.linux.dev>, <kvm-riscv@lists.infradead.org>, Nikolas Wipper <nikwip@amazon.de> Subject: [PATCH 09/15] KVM: x86/mmu: Introduce status parameter to page walker Date: Tue, 10 Sep 2024 15:22:01 +0000 Message-ID: <20240910152207.38974-10-nikwip@amazon.de> In-Reply-To: <20240910152207.38974-1-nikwip@amazon.de> References: <20240910152207.38974-1-nikwip@amazon.de> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit
Series	KVM: x86: Introduce new ioctl KVM_TRANSLATE2 \| expand [00/15] KVM: x86: Introduce new ioctl KVM_TRANSLATE2 [01/15] KVM: Add API documentation for KVM_TRANSLATE2 [02/15] KVM: x86/mmu: Abort page walk if permission checks fail [03/15] KVM: x86/mmu: Introduce exception flag for unmapped GPAs [04/15] KVM: x86/mmu: Store GPA in exception if applicable [05/15] KVM: x86/mmu: Introduce flags parameter to page walker [06/15] KVM: x86/mmu: Implement PWALK_SET_ACCESSED in page walker [07/15] KVM: x86/mmu: Implement PWALK_SET_DIRTY in page walker [08/15] KVM: x86/mmu: Implement PWALK_FORCE_SET_ACCESSED in page walker [09/15] KVM: x86/mmu: Introduce status parameter to page walker [10/15] KVM: x86/mmu: Implement PWALK_STATUS_READ_ONLY_PTE_GPA in page walker [11/15] KVM: x86: Introduce generic gva to gpa translation function [12/15] KVM: Introduce KVM_TRANSLATE2 [13/15] KVM: Add KVM_TRANSLATE2 stub [14/15] KVM: x86: Implement KVM_TRANSLATE2 [15/15] KVM: selftests: Add test for KVM_TRANSLATE2

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index cd2c391d6a24..1c5aaf55c683 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -460,7 +460,7 @@ struct kvm_mmu { struct x86_exception *fault); gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, gpa_t gva_or_gpa, u64 access, u64 flags, - struct x86_exception *exception); + struct x86_exception *exception, u16 *status); int (*sync_spte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, int i); struct kvm_mmu_root_info root; diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index b237231ace61..30d5b86bc306 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2037,7 +2037,7 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) */ if (!hc->fast && is_guest_mode(vcpu)) { hc->ingpa = translate_nested_gpa(vcpu, hc->ingpa, 0, - PWALK_SET_ALL, NULL); + PWALK_SET_ALL, NULL, NULL); if (unlikely(hc->ingpa == INVALID_GPA)) return HV_STATUS_INVALID_HYPERCALL_INPUT; } diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 35030f6466b5..272ce93f855f 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -275,15 +275,17 @@ static inline void kvm_update_page_stats(struct kvm *kvm, int level, int count) } gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access, - u64 flags, struct x86_exception *exception); + u64 flags, struct x86_exception *exception, + u16 *status); static inline gpa_t kvm_translate_gpa(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, gpa_t gpa, u64 access, u64 flags, - struct x86_exception *exception) + struct x86_exception *exception, + u16 *status) { if (mmu != &vcpu->arch.nested_mmu) return gpa; - return translate_nested_gpa(vcpu, gpa, access, flags, exception); + return translate_nested_gpa(vcpu, gpa, access, flags, exception, status); } #endif diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 50c635142bf7..2ab0437edf54 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4103,11 +4103,12 @@ void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu) static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, gpa_t vaddr, u64 access, u64 flags, - struct x86_exception *exception) + struct x86_exception *exception, u16 *status) { if (exception) exception->error_code = 0; - return kvm_translate_gpa(vcpu, mmu, vaddr, access, flags, exception); + return kvm_translate_gpa(vcpu, mmu, vaddr, access, flags, exception, + status); } static bool mmio_info_in_cache(struct kvm_vcpu *vcpu, u64 addr, bool direct) diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index 2cc40fd17f53..985a19dda603 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -197,7 +197,8 @@ static inline unsigned FNAME(gpte_access)(u64 gpte) static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, struct guest_walker *walker, - gpa_t addr, int write_fault) + gpa_t addr, int write_fault, + u16 *status) { unsigned level, index; pt_element_t pte, orig_pte; @@ -301,7 +302,8 @@ static inline bool FNAME(is_last_gpte)(struct kvm_mmu *mmu, */ static int FNAME(walk_addr_generic)(struct guest_walker *walker, struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, - gpa_t addr, u64 access, u64 flags) + gpa_t addr, u64 access, u64 flags, + u16 *status) { int ret; pt_element_t pte; @@ -344,6 +346,9 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, walker->fault.flags = 0; + if (status) + *status = 0; + /* * FIXME: on Intel processors, loads of the PDPTE registers for PAE paging * by the MOV to CR instruction are treated as reads and do not cause the @@ -383,7 +388,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(table_gfn), nested_access, flags, - &walker->fault); + &walker->fault, status); /* * FIXME: This can happen if emulation (for of an INS/OUTS @@ -453,8 +458,8 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, gfn += pse36_gfn_delta(pte); #endif - real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(gfn), access, - flags, &walker->fault); + real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(gfn), access, flags, + &walker->fault, status); if (real_gpa == INVALID_GPA) goto late_exit; @@ -473,7 +478,8 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, if (unlikely(set_accessed && !accessed_dirty)) { ret = FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker, addr, - write_fault && set_dirty); + write_fault && set_dirty, + status); if (unlikely(ret < 0)) goto error; else if (ret) @@ -538,7 +544,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, */ ++walker->level; FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker, addr, - false); + false, status); --walker->level; } return 0; @@ -548,7 +554,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker, struct kvm_vcpu *vcpu, gpa_t addr, u64 access, u64 flags) { return FNAME(walk_addr_generic)(walker, vcpu, vcpu->arch.mmu, addr, - access, flags); + access, flags, NULL); } static bool @@ -891,7 +897,7 @@ static gpa_t FNAME(get_level1_sp_gpa)(struct kvm_mmu_page *sp) /* Note, @addr is a GPA when gva_to_gpa() translates an L2 GPA to an L1 GPA. */ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, gpa_t addr, u64 access, u64 flags, - struct x86_exception *exception) + struct x86_exception *exception, u16 *status) { struct guest_walker walker; gpa_t gpa = INVALID_GPA; @@ -902,7 +908,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, WARN_ON_ONCE((addr >> 32) && mmu == vcpu->arch.walk_mmu); #endif - r = FNAME(walk_addr_generic)(&walker, vcpu, mmu, addr, access, flags); + r = FNAME(walk_addr_generic)(&walker, vcpu, mmu, addr, access, flags, status); if (r) { gpa = gfn_to_gpa(walker.gfn); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 32e81cd502ee..be696b60aba6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1068,7 +1068,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) */ real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(pdpt_gfn), PFERR_USER_MASK | PFERR_WRITE_MASK, - PWALK_SET_ALL, NULL); + PWALK_SET_ALL, NULL, NULL); if (real_gpa == INVALID_GPA) return 0; @@ -7561,7 +7561,8 @@ void kvm_get_segment(struct kvm_vcpu *vcpu, } gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access, - u64 flags, struct x86_exception *exception) + u64 flags, struct x86_exception *exception, + u16 *status) { struct kvm_mmu *mmu = vcpu->arch.mmu; gpa_t t_gpa; @@ -7570,7 +7571,8 @@ gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access, /* NPT walks are always user-walks */ access |= PFERR_USER_MASK; - t_gpa = mmu->gva_to_gpa(vcpu, mmu, gpa, access, flags, exception); + t_gpa = mmu->gva_to_gpa(vcpu, mmu, gpa, access, flags, exception, + status); return t_gpa; } @@ -7582,7 +7584,7 @@ gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u64 access = (kvm_x86_call(get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; return mmu->gva_to_gpa(vcpu, mmu, gva, access, PWALK_SET_ALL, - exception); + exception, NULL); } EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read); @@ -7594,7 +7596,7 @@ gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u64 access = (kvm_x86_call(get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; access |= PFERR_WRITE_MASK; return mmu->gva_to_gpa(vcpu, mmu, gva, access, PWALK_SET_ALL, - exception); + exception, NULL); } EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_write); @@ -7604,7 +7606,7 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, { struct kvm_mmu *mmu = vcpu->arch.walk_mmu; - return mmu->gva_to_gpa(vcpu, mmu, gva, 0, PWALK_SET_ALL, exception); + return mmu->gva_to_gpa(vcpu, mmu, gva, 0, PWALK_SET_ALL, exception, NULL); } static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, @@ -7617,7 +7619,7 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, while (bytes) { gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access, - PWALK_SET_ALL, exception); + PWALK_SET_ALL, exception, NULL); unsigned offset = addr & (PAGE_SIZE-1); unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); int ret; @@ -7652,7 +7654,8 @@ static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, /* Inline kvm_read_guest_virt_helper for speed. */ gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access | PFERR_FETCH_MASK, - PWALK_SET_ALL, exception); + PWALK_SET_ALL, + exception, NULL); if (unlikely(gpa == INVALID_GPA)) return X86EMUL_PROPAGATE_FAULT; @@ -7710,7 +7713,7 @@ static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes while (bytes) { gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access, - PWALK_SET_ALL, exception); + PWALK_SET_ALL, exception, NULL); unsigned offset = addr & (PAGE_SIZE-1); unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); int ret; @@ -7830,7 +7833,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, return 1; } - *gpa = mmu->gva_to_gpa(vcpu, mmu, gva, access, PWALK_SET_ALL, exception); + *gpa = mmu->gva_to_gpa(vcpu, mmu, gva, access, PWALK_SET_ALL, exception, NULL); if (*gpa == INVALID_GPA) return -1; @@ -13651,7 +13654,7 @@ void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_c if (!(error_code & PFERR_PRESENT_MASK) || mmu->gva_to_gpa(vcpu, mmu, gva, access, PWALK_SET_ALL, - &fault) != INVALID_GPA) { + &fault, NULL) != INVALID_GPA) { /* * If vcpu->arch.walk_mmu->gva_to_gpa succeeded, the page * tables probably do not match the TLB. Just proceed

[09/15] KVM: x86/mmu: Introduce status parameter to page walker

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