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([10.124.223.186]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Oct 2024 12:01:07 -0700 From: Rick Edgecombe To: pbonzini@redhat.com, seanjc@google.com Cc: rick.p.edgecombe@intel.com, yan.y.zhao@intel.com, isaku.yamahata@gmail.com, kai.huang@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, tony.lindgren@linux.intel.com, xiaoyao.li@intel.com, reinette.chatre@intel.com, Isaku Yamahata , Sean Christopherson , Adrian Hunter Subject: [PATCH v2 23/25] KVM: TDX: Do TDX specific vcpu initialization Date: Wed, 30 Oct 2024 12:00:36 -0700 Message-ID: <20241030190039.77971-24-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241030190039.77971-1-rick.p.edgecombe@intel.com> References: <20241030190039.77971-1-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Isaku Yamahata TD guest vcpu needs TDX specific initialization before running. Repurpose KVM_MEMORY_ENCRYPT_OP to vcpu-scope, add a new sub-command KVM_TDX_INIT_VCPU, and implement the callback for it. Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata Co-developed-by: Tony Lindgren Signed-off-by: Tony Lindgren Co-developed-by: Adrian Hunter Signed-off-by: Adrian Hunter Signed-off-by: Rick Edgecombe --- uAPI breakout v2: - Drop dummy tdx_vcpu_reset() (Binbin) - Calculate nr_vcpu_tcds_pages on init (Nikolay) - Use vcpu_tdcx naming instead of just tdcx (Yuan) - No need for is_td_vcpu_created() (Rick) - No need for is_td_finalized() (Rick) - Export functions used (Binbin) - Fixup SEAMCALL call sites due to function parameter changes to SEAMCALL wrappers (Kai) - Add TD state handling (Tony) - Clarify comment wrt is_hkid_assigned() in tdx_vcpu_free() (Yuan) - Fix error paths in tdx_td_vcpu_init() (Yuan) - Do not unnecessarily leak tdx->tdvpr_pa in tdx_vcpu_free() (Yuan) uAPI breakout v1: - Support FEATURES0_TOPOLOGY_ENUM - Update for the wrapper functions for SEAMCALLs. (Sean) - Remove WARN_ON_ONCE() in tdx_vcpu_free(). WARN_ON_ONCE(vcpu->cpu != -1), WARN_ON_ONCE(tdx->tdvpx_pa), WARN_ON_ONCE(tdx->tdvpr_pa) - Remove KVM_BUG_ON() in tdx_vcpu_reset(). - Remove duplicate "tdx->tdvpr_pa=" lines - Rename tdvpx to tdcx as it is confusing, follow spec change for same reason (Isaku) - Updates from seamcall overhaul (Kai) - Rename error->hw_error - Change using tdx_info to using exported 'tdx_sysinfo' pointer in tdx_td_vcpu_init(). - Remove code to the old (non-existing) tdx_module_setup(). - Use a new wrapper tdx_sysinfo_nr_tdcx_pages() to replace tdx_info->nr_tdcx_pages. - Combine the two for loops in tdx_td_vcpu_init() (Chao) - Add more line breaks into tdx_td_vcpu_init() for readability (Tony) - Drop Drop local tdcx_pa in tdx_td_vcpu_init() (Rick) - Drop Drop local tdvpr_pa in tdx_td_vcpu_init() (Rick) v18: - Use tdh_sys_rd() instead of struct tdsysinfo_struct. - Rename tdx_reclaim_td_page() => tdx_reclaim_control_page() - Remove the change of tools/arch/x86/include/uapi/asm/kvm.h. --- arch/x86/include/asm/kvm-x86-ops.h | 1 + arch/x86/include/asm/kvm_host.h | 1 + arch/x86/include/uapi/asm/kvm.h | 1 + arch/x86/kvm/vmx/main.c | 9 ++ arch/x86/kvm/vmx/tdx.c | 182 ++++++++++++++++++++++++++++- arch/x86/kvm/vmx/tdx.h | 13 ++- arch/x86/kvm/vmx/tdx_arch.h | 2 + arch/x86/kvm/vmx/x86_ops.h | 4 + arch/x86/kvm/x86.c | 8 ++ 9 files changed, 219 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h index e7bd7867cb94..ec1b1b39c6b3 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -125,6 +125,7 @@ KVM_X86_OP(enable_smi_window) #endif KVM_X86_OP_OPTIONAL(dev_get_attr) KVM_X86_OP(mem_enc_ioctl) +KVM_X86_OP_OPTIONAL(vcpu_mem_enc_ioctl) KVM_X86_OP_OPTIONAL(mem_enc_register_region) KVM_X86_OP_OPTIONAL(mem_enc_unregister_region) KVM_X86_OP_OPTIONAL(vm_copy_enc_context_from) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index d8478e103f07..dfa89a5d15ef 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1827,6 +1827,7 @@ struct kvm_x86_ops { int (*dev_get_attr)(u32 group, u64 attr, u64 *val); int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp); + int (*vcpu_mem_enc_ioctl)(struct kvm_vcpu *vcpu, void __user *argp); int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp); int (*mem_enc_unregister_region)(struct kvm *kvm, struct kvm_enc_region *argp); int (*vm_copy_enc_context_from)(struct kvm *kvm, unsigned int source_fd); diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index 892e16bd7430..2cfec4b42b9d 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -930,6 +930,7 @@ struct kvm_hyperv_eventfd { enum kvm_tdx_cmd_id { KVM_TDX_CAPABILITIES = 0, KVM_TDX_INIT_VM, + KVM_TDX_INIT_VCPU, KVM_TDX_CMD_NR_MAX, }; diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index 0548d54eb055..d28ffddd766f 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -106,6 +106,14 @@ static int vt_mem_enc_ioctl(struct kvm *kvm, void __user *argp) return tdx_vm_ioctl(kvm, argp); } +static int vt_vcpu_mem_enc_ioctl(struct kvm_vcpu *vcpu, void __user *argp) +{ + if (!is_td_vcpu(vcpu)) + return -EINVAL; + + return tdx_vcpu_ioctl(vcpu, argp); +} + #define VMX_REQUIRED_APICV_INHIBITS \ (BIT(APICV_INHIBIT_REASON_DISABLED) | \ BIT(APICV_INHIBIT_REASON_ABSENT) | \ @@ -260,6 +268,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = { .get_untagged_addr = vmx_get_untagged_addr, .mem_enc_ioctl = vt_mem_enc_ioctl, + .vcpu_mem_enc_ioctl = vt_vcpu_mem_enc_ioctl, }; struct kvm_x86_init_ops vt_init_ops __initdata = { diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 479ffb8f41c8..9008db6cf3b4 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -419,6 +419,7 @@ int tdx_vm_init(struct kvm *kvm) int tdx_vcpu_create(struct kvm_vcpu *vcpu) { struct kvm_tdx *kvm_tdx = to_kvm_tdx(vcpu->kvm); + struct vcpu_tdx *tdx = to_tdx(vcpu); if (kvm_tdx->state != TD_STATE_INITIALIZED) return -EIO; @@ -442,12 +443,42 @@ int tdx_vcpu_create(struct kvm_vcpu *vcpu) if ((kvm_tdx->xfam & XFEATURE_MASK_XTILE) == XFEATURE_MASK_XTILE) vcpu->arch.xfd_no_write_intercept = true; + tdx->state = VCPU_TD_STATE_UNINITIALIZED; + return 0; } void tdx_vcpu_free(struct kvm_vcpu *vcpu) { - /* This is stub for now. More logic will come. */ + struct kvm_tdx *kvm_tdx = to_kvm_tdx(vcpu->kvm); + struct vcpu_tdx *tdx = to_tdx(vcpu); + int i; + + /* + * It is not possible to reclaim pages while hkid is assigned. It might + * be assigned if: + * 1. the TD VM is being destroyed but freeing hkid failed, in which + * case the pages are leaked + * 2. TD VCPU creation failed and this on the error path, in which case + * there is nothing to do anyway + */ + if (is_hkid_assigned(kvm_tdx)) + return; + + if (tdx->tdcx_pa) { + for (i = 0; i < kvm_tdx->nr_vcpu_tdcx_pages; i++) { + if (tdx->tdcx_pa[i]) + tdx_reclaim_control_page(tdx->tdcx_pa[i]); + } + kfree(tdx->tdcx_pa); + tdx->tdcx_pa = NULL; + } + if (tdx->tdvpr_pa) { + tdx_reclaim_control_page(tdx->tdvpr_pa); + tdx->tdvpr_pa = 0; + } + + tdx->state = VCPU_TD_STATE_UNINITIALIZED; } static int tdx_get_capabilities(struct kvm_tdx_cmd *cmd) @@ -657,6 +688,9 @@ static int __tdx_td_init(struct kvm *kvm, struct td_params *td_params, tdr_pa = __pa(va); kvm_tdx->nr_tdcs_pages = tdx_sysinfo->td_ctrl.tdcs_base_size / PAGE_SIZE; + /* TDVPS = TDVPR(4K page) + TDCX(multiple 4K pages), -1 for TDVPR. */ + kvm_tdx->nr_vcpu_tdcx_pages = tdx_sysinfo->td_ctrl.tdvps_base_size / PAGE_SIZE - 1; + tdcs_pa = kcalloc(kvm_tdx->nr_tdcs_pages, sizeof(*kvm_tdx->tdcs_pa), GFP_KERNEL_ACCOUNT | __GFP_ZERO); if (!tdcs_pa) @@ -936,6 +970,152 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) return r; } +/* VMM can pass one 64bit auxiliary data to vcpu via RCX for guest BIOS. */ +static int tdx_td_vcpu_init(struct kvm_vcpu *vcpu, u64 vcpu_rcx) +{ + const struct tdx_sys_info_features *modinfo = &tdx_sysinfo->features; + struct kvm_tdx *kvm_tdx = to_kvm_tdx(vcpu->kvm); + struct vcpu_tdx *tdx = to_tdx(vcpu); + unsigned long va; + int ret, i; + u64 err; + + va = __get_free_page(GFP_KERNEL_ACCOUNT); + if (!va) + return -ENOMEM; + tdx->tdvpr_pa = __pa(va); + + tdx->tdcx_pa = kcalloc(kvm_tdx->nr_vcpu_tdcx_pages, sizeof(*tdx->tdcx_pa), + GFP_KERNEL_ACCOUNT); + if (!tdx->tdcx_pa) { + ret = -ENOMEM; + goto free_tdvpr; + } + + for (i = 0; i < kvm_tdx->nr_vcpu_tdcx_pages; i++) { + va = __get_free_page(GFP_KERNEL_ACCOUNT); + if (!va) { + ret = -ENOMEM; + goto free_tdcx; + } + tdx->tdcx_pa[i] = __pa(va); + } + + err = tdh_vp_create(kvm_tdx->tdr_pa, tdx->tdvpr_pa); + if (KVM_BUG_ON(err, vcpu->kvm)) { + ret = -EIO; + pr_tdx_error(TDH_VP_CREATE, err); + goto free_tdcx; + } + + for (i = 0; i < kvm_tdx->nr_vcpu_tdcx_pages; i++) { + err = tdh_vp_addcx(tdx->tdvpr_pa, tdx->tdcx_pa[i]); + if (KVM_BUG_ON(err, vcpu->kvm)) { + pr_tdx_error(TDH_VP_ADDCX, err); + /* + * Pages already added are reclaimed by the vcpu_free + * method, but the rest are freed here. + */ + for (; i < kvm_tdx->nr_vcpu_tdcx_pages; i++) { + free_page((unsigned long)__va(tdx->tdcx_pa[i])); + tdx->tdcx_pa[i] = 0; + } + return -EIO; + } + } + + if (modinfo->tdx_features0 & MD_FIELD_ID_FEATURES0_TOPOLOGY_ENUM) + err = tdh_vp_init_apicid(tdx->tdvpr_pa, vcpu_rcx, vcpu->vcpu_id); + else + err = tdh_vp_init(tdx->tdvpr_pa, vcpu_rcx); + + if (KVM_BUG_ON(err, vcpu->kvm)) { + pr_tdx_error(TDH_VP_INIT, err); + return -EIO; + } + + vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; + + return 0; + +free_tdcx: + for (i = 0; i < kvm_tdx->nr_vcpu_tdcx_pages; i++) { + if (tdx->tdcx_pa[i]) + free_page((unsigned long)__va(tdx->tdcx_pa[i])); + tdx->tdcx_pa[i] = 0; + } + kfree(tdx->tdcx_pa); + tdx->tdcx_pa = NULL; + +free_tdvpr: + if (tdx->tdvpr_pa) + free_page((unsigned long)__va(tdx->tdvpr_pa)); + tdx->tdvpr_pa = 0; + + return ret; +} + +static int tdx_vcpu_init(struct kvm_vcpu *vcpu, struct kvm_tdx_cmd *cmd) +{ + struct msr_data apic_base_msr; + struct vcpu_tdx *tdx = to_tdx(vcpu); + int ret; + + if (cmd->flags) + return -EINVAL; + + if (tdx->state != VCPU_TD_STATE_UNINITIALIZED) + return -EINVAL; + + /* + * As TDX requires X2APIC, set local apic mode to X2APIC. User space + * VMM, e.g. qemu, is required to set CPUID[0x1].ecx.X2APIC=1 by + * KVM_SET_CPUID2. Otherwise kvm_set_apic_base() will fail. + */ + apic_base_msr = (struct msr_data) { + .host_initiated = true, + .data = APIC_DEFAULT_PHYS_BASE | LAPIC_MODE_X2APIC | + (kvm_vcpu_is_reset_bsp(vcpu) ? MSR_IA32_APICBASE_BSP : 0), + }; + if (kvm_set_apic_base(vcpu, &apic_base_msr)) + return -EINVAL; + + ret = tdx_td_vcpu_init(vcpu, (u64)cmd->data); + if (ret) + return ret; + + tdx->state = VCPU_TD_STATE_INITIALIZED; + + return 0; +} + +int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) +{ + struct kvm_tdx *kvm_tdx = to_kvm_tdx(vcpu->kvm); + struct kvm_tdx_cmd cmd; + int ret; + + if (!is_hkid_assigned(kvm_tdx) || kvm_tdx->state == TD_STATE_RUNNABLE) + return -EINVAL; + + if (copy_from_user(&cmd, argp, sizeof(cmd))) + return -EFAULT; + + if (cmd.hw_error) + return -EINVAL; + + switch (cmd.id) { + case KVM_TDX_INIT_VCPU: + ret = tdx_vcpu_init(vcpu, &cmd); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + static int tdx_online_cpu(unsigned int cpu) { unsigned long flags; diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h index 1fcb7c1b078d..1b78a7ea988e 100644 --- a/arch/x86/kvm/vmx/tdx.h +++ b/arch/x86/kvm/vmx/tdx.h @@ -27,15 +27,26 @@ struct kvm_tdx { u64 xfam; int hkid; u8 nr_tdcs_pages; + u8 nr_vcpu_tdcx_pages; u64 tsc_offset; enum kvm_tdx_state state; }; +/* TDX module vCPU states */ +enum vcpu_tdx_state { + VCPU_TD_STATE_UNINITIALIZED = 0, + VCPU_TD_STATE_INITIALIZED, +}; + struct vcpu_tdx { struct kvm_vcpu vcpu; - /* TDX specific members follow. */ + + unsigned long tdvpr_pa; + unsigned long *tdcx_pa; + + enum vcpu_tdx_state state; }; static inline bool is_td(struct kvm *kvm) diff --git a/arch/x86/kvm/vmx/tdx_arch.h b/arch/x86/kvm/vmx/tdx_arch.h index 84af7666e958..9d41699e66a2 100644 --- a/arch/x86/kvm/vmx/tdx_arch.h +++ b/arch/x86/kvm/vmx/tdx_arch.h @@ -155,4 +155,6 @@ struct td_params { #define TDX_MIN_TSC_FREQUENCY_KHZ (100 * 1000) #define TDX_MAX_TSC_FREQUENCY_KHZ (10 * 1000 * 1000) +#define MD_FIELD_ID_FEATURES0_TOPOLOGY_ENUM BIT_ULL(20) + #endif /* __KVM_X86_TDX_ARCH_H */ diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h index 107c60ac94f4..4739891858ea 100644 --- a/arch/x86/kvm/vmx/x86_ops.h +++ b/arch/x86/kvm/vmx/x86_ops.h @@ -127,6 +127,8 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp); int tdx_vcpu_create(struct kvm_vcpu *vcpu); void tdx_vcpu_free(struct kvm_vcpu *vcpu); + +int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp); #else static inline int tdx_vm_init(struct kvm *kvm) { return -EOPNOTSUPP; } static inline void tdx_mmu_release_hkid(struct kvm *kvm) {} @@ -136,6 +138,8 @@ static inline int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) { return -EOP static inline int tdx_vcpu_create(struct kvm_vcpu *vcpu) { return -EOPNOTSUPP; } static inline void tdx_vcpu_free(struct kvm_vcpu *vcpu) {} + +static inline int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) { return -EOPNOTSUPP; } #endif #endif /* __KVM_X86_VMX_X86_OPS_H */ diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 95a10c7bc507..92de7ebf2cee 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -698,6 +698,7 @@ int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) kvm_recalculate_apic_map(vcpu->kvm); return 0; } +EXPORT_SYMBOL_GPL(kvm_set_apic_base); /* * Handle a fault on a hardware virtualization (VMX or SVM) instruction. @@ -6308,6 +6309,12 @@ long kvm_arch_vcpu_ioctl(struct file *filp, case KVM_SET_DEVICE_ATTR: r = kvm_vcpu_ioctl_device_attr(vcpu, ioctl, argp); break; + case KVM_MEMORY_ENCRYPT_OP: + r = -ENOTTY; + if (!kvm_x86_ops.vcpu_mem_enc_ioctl) + goto out; + r = kvm_x86_ops.vcpu_mem_enc_ioctl(vcpu, argp); + break; default: r = -EINVAL; } @@ -12663,6 +12670,7 @@ bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) { return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; } +EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) {