From patchwork Tue Jan 10 17:50:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Gonda X-Patchwork-Id: 13095424 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4516DC54EBC for ; Tue, 10 Jan 2023 17:51:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234966AbjAJRvZ (ORCPT ); Tue, 10 Jan 2023 12:51:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234431AbjAJRvQ (ORCPT ); Tue, 10 Jan 2023 12:51:16 -0500 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DAC4C52743 for ; Tue, 10 Jan 2023 09:51:13 -0800 (PST) Received: by mail-pl1-x64a.google.com with SMTP id u2-20020a17090341c200b00192bc565119so8871758ple.16 for ; Tue, 10 Jan 2023 09:51:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=4U9uRuUguD/arQj7XJonH4LDOPTxCYKP8K5iLO88CxQ=; b=sdwC3weVDY5naRciojTNgo/3cv/Gt817VMW1weicXkTpxdAld+DKvPPreh90RxQPKo LHgjLmiEb61D5sx99XY9R0hCbSw9nXlruJs+3CfiwBXwilt+4yqHGX2hN9GeLwoWhHwO YNE+8gvuAbi8dDxV0cZcFBfqQ+CrvsBiQ4mMvSBwJrM68rojaL3m+CNTo/TEGdpKLKzT Klot+dvcRaXxVULqC7szBZX167v+LkvlQiDDFmIPAli7gHZq5SouCC2aUHi1ufhs3zgD 59DkxecZgDFOnWKaZOTgPK3r4i70TIFAUryVtUG/CGBvv/Tm5X4PyOuD1+3IxeefWd8s 4kyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=4U9uRuUguD/arQj7XJonH4LDOPTxCYKP8K5iLO88CxQ=; b=GVe4CuM0erYke6mC4iXeaYsO1mbcYuvpgvCM3uNqFTNd98hUBDudYGvpd28p9nWM8p FYB/7pkh04YLGvk30jKr5e4GVBZPDLlRRiDn+hm7JcFnBhTzorWQX/85pRY0KpyQuVT5 moA4bLLPmgrPWSuYhaSPwdXVBUwr+hglUOMIIpVBuYwQ63IQJxjSluXltQIPI4wg+Sx2 r5sfbDdenizVA008zp48q4HJ9aMKHlAvGYhFDJ2DZnG4yzFvJ6amy5S3+9tcV49L8nYP Y+CktkCmWk4/mpjbgQ0ISBenr8758c25yHGV+00it1jJ0ECqueWnocQSmAbnJ1aarruH /jXw== X-Gm-Message-State: AFqh2koMnNsxNrGY2Esy5C+2FjUHfBmo6wZKo/aJTLjxQwlK6f0tNYo1 LeL0NiBdMdSiEkJiDJYxgmyODRAa90/2c6d2vHkzdlqWtbGDtbHlNucuSRzVPZCe8S7YmqSBY6a +kgdQSXas9zJbgFNrcY1Fqo55T8lK1G7dqCZqvY0CK6GcIcl6ua4K3B7SPA== X-Google-Smtp-Source: AMrXdXsuvGMiPvkNQuHDAFnowQingmuMnoWEiAtOTZ00HqZwqql7PgULRRPQlNR7e6DyDgRzbf0vnb1P1FU= X-Received: from pgonda1.kir.corp.google.com ([2620:0:1008:11:8358:4c2a:eae1:4752]) (user=pgonda job=sendgmr) by 2002:a05:6a00:bf4:b0:576:e69d:a19 with SMTP id x52-20020a056a000bf400b00576e69d0a19mr5107714pfu.49.1673373073317; Tue, 10 Jan 2023 09:51:13 -0800 (PST) Date: Tue, 10 Jan 2023 09:50:55 -0800 In-Reply-To: <20230110175057.715453-1-pgonda@google.com> Message-Id: <20230110175057.715453-6-pgonda@google.com> Mime-Version: 1.0 References: <20230110175057.715453-1-pgonda@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Subject: [PATCH V6 5/7] KVM: selftests: add library for creating/interacting with SEV guests From: Peter Gonda To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Peter Gonda , Paolo Bonzini , Sean Christopherson , Vishal Annapurve , Ackerley Tng , Andrew Jones , Michael Roth Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add interfaces to allow tests to create SEV guests. The additional requirements for SEV guests PTs and other state is encapsulated by the new vm_sev_create_with_one_vcpu() function. This can future be generalized for more vCPUs but the first set of SEV selftests in this series only uses a single vCPU. Cc: Paolo Bonzini Cc: Sean Christopherson Cc: Vishal Annapurve Cc: Ackerley Tng cc: Andrew Jones Originally-by: Michael Roth Co-developed-by: Ackerley Tng Signed-off-by: Peter Gonda --- tools/arch/x86/include/asm/kvm_host.h | 1 + tools/testing/selftests/kvm/Makefile | 3 +- .../selftests/kvm/include/kvm_util_base.h | 15 +- .../selftests/kvm/include/x86_64/processor.h | 1 + .../selftests/kvm/include/x86_64/sev.h | 27 ++ tools/testing/selftests/kvm/lib/kvm_util.c | 8 +- .../selftests/kvm/lib/x86_64/processor.c | 45 +++- tools/testing/selftests/kvm/lib/x86_64/sev.c | 254 ++++++++++++++++++ 8 files changed, 343 insertions(+), 11 deletions(-) create mode 100644 tools/testing/selftests/kvm/include/x86_64/sev.h create mode 100644 tools/testing/selftests/kvm/lib/x86_64/sev.c diff --git a/tools/arch/x86/include/asm/kvm_host.h b/tools/arch/x86/include/asm/kvm_host.h index d8f48fe835fb..c95041e92fb5 100644 --- a/tools/arch/x86/include/asm/kvm_host.h +++ b/tools/arch/x86/include/asm/kvm_host.h @@ -8,6 +8,7 @@ struct kvm_vm_arch { uint64_t c_bit; uint64_t s_bit; + bool is_pt_protected; }; #endif // _TOOLS_LINUX_ASM_X86_KVM_HOST_H diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 1750f91dd936..b7cfb15712d1 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -39,6 +39,7 @@ LIBKVM_x86_64 += lib/x86_64/processor.c LIBKVM_x86_64 += lib/x86_64/svm.c LIBKVM_x86_64 += lib/x86_64/ucall.c LIBKVM_x86_64 += lib/x86_64/vmx.c +LIBKVM_x86_64 += lib/x86_64/sev.c LIBKVM_aarch64 += lib/aarch64/gic.c LIBKVM_aarch64 += lib/aarch64/gic_v3.c @@ -199,7 +200,7 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \ -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ -I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \ -I$(protected); } +uint64_t vm_nr_pages_required(enum vm_guest_mode mode, + uint32_t nr_runnable_vcpus, + uint64_t extra_mem_pages); + /* * ____vm_create() does KVM_CREATE_VM and little else. __vm_create() also * loads the test binary into guest memory and creates an IRQ chip (x86 only). @@ -767,8 +778,8 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm); unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size); unsigned int vm_num_host_pages(enum vm_guest_mode mode, unsigned int num_guest_pages); unsigned int vm_num_guest_pages(enum vm_guest_mode mode, unsigned int num_host_pages); -static inline unsigned int -vm_adjust_num_guest_pages(enum vm_guest_mode mode, unsigned int num_guest_pages) +static inline unsigned int vm_adjust_num_guest_pages(enum vm_guest_mode mode, + unsigned int num_guest_pages) { unsigned int n; n = vm_num_guest_pages(mode, vm_num_host_pages(mode, num_guest_pages)); diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 2a5f47d51388..1c72fb5672a9 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -916,6 +916,7 @@ static inline void vcpu_set_msr(struct kvm_vcpu *vcpu, uint64_t msr_index, void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits); +void kvm_init_vm_address_properties(struct kvm_vm *vm); bool vm_is_unrestricted_guest(struct kvm_vm *vm); struct ex_regs { diff --git a/tools/testing/selftests/kvm/include/x86_64/sev.h b/tools/testing/selftests/kvm/include/x86_64/sev.h new file mode 100644 index 000000000000..e212b032cd77 --- /dev/null +++ b/tools/testing/selftests/kvm/include/x86_64/sev.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Helpers used for SEV guests + * + */ +#ifndef SELFTEST_KVM_SEV_H +#define SELFTEST_KVM_SEV_H + +#include +#include + +#include "kvm_util.h" + +#define CPUID_MEM_ENC_LEAF 0x8000001f +#define CPUID_EBX_CBIT_MASK 0x3f + +#define SEV_POLICY_NO_DBG (1UL << 0) +#define SEV_POLICY_ES (1UL << 2) + +bool is_kvm_sev_supported(void); + +void sev_vm_init(struct kvm_vm *vm); + +struct kvm_vm *vm_sev_create_with_one_vcpu(uint32_t policy, void *guest_code, + struct kvm_vcpu **cpu); + +#endif /* SELFTEST_KVM_SEV_H */ diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 0d0a7ad7632d..99983a5c5558 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -151,6 +151,7 @@ const char *vm_guest_mode_string(uint32_t i) [VM_MODE_P40V48_16K] = "PA-bits:40, VA-bits:48, 16K pages", [VM_MODE_P40V48_64K] = "PA-bits:40, VA-bits:48, 64K pages", [VM_MODE_PXXV48_4K] = "PA-bits:ANY, VA-bits:48, 4K pages", + [VM_MODE_PXXV48_4K_SEV] = "PA-bits:ANY, VA-bits:48, 4K pages", [VM_MODE_P47V64_4K] = "PA-bits:47, VA-bits:64, 4K pages", [VM_MODE_P44V64_4K] = "PA-bits:44, VA-bits:64, 4K pages", [VM_MODE_P36V48_4K] = "PA-bits:36, VA-bits:48, 4K pages", @@ -176,6 +177,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { [VM_MODE_P40V48_16K] = { 40, 48, 0x4000, 14 }, [VM_MODE_P40V48_64K] = { 40, 48, 0x10000, 16 }, [VM_MODE_PXXV48_4K] = { 0, 0, 0x1000, 12 }, + [VM_MODE_PXXV48_4K_SEV] = { 0, 0, 0x1000, 12 }, [VM_MODE_P47V64_4K] = { 47, 64, 0x1000, 12 }, [VM_MODE_P44V64_4K] = { 44, 64, 0x1000, 12 }, [VM_MODE_P36V48_4K] = { 36, 48, 0x1000, 12 }, @@ -254,9 +256,11 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) case VM_MODE_P36V47_16K: vm->pgtable_levels = 3; break; + case VM_MODE_PXXV48_4K_SEV: case VM_MODE_PXXV48_4K: #ifdef __x86_64__ kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits); + kvm_init_vm_address_properties(vm); /* * Ignore KVM support for 5-level paging (vm->va_bits == 57), * it doesn't take effect unless a CR4.LA57 is set, which it @@ -270,7 +274,7 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) vm->pgtable_levels = 4; vm->va_bits = 48; #else - TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms"); + TEST_FAIL("VM_MODE_PXXV48_4K* not supported on non-x86 platforms"); #endif break; case VM_MODE_P47V64_4K: @@ -303,7 +307,7 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) return vm; } -static uint64_t vm_nr_pages_required(enum vm_guest_mode mode, +uint64_t vm_nr_pages_required(enum vm_guest_mode mode, uint32_t nr_runnable_vcpus, uint64_t extra_mem_pages) { diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index d03cefd9f6cd..557146ba85a8 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -8,6 +8,7 @@ #include "test_util.h" #include "kvm_util.h" #include "processor.h" +#include "sev.h" #ifndef NUM_INTERRUPTS #define NUM_INTERRUPTS 256 @@ -119,10 +120,16 @@ bool kvm_is_tdp_enabled(void) return get_kvm_amd_param_bool("npt"); } +static void assert_supported_guest_mode(struct kvm_vm *vm) +{ + TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K || vm->mode == VM_MODE_PXXV48_4K_SEV, + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", + vm->mode); +} + void virt_arch_pgd_alloc(struct kvm_vm *vm) { - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + assert_supported_guest_mode(vm); /* If needed, create page map l4 table. */ if (!vm->pgd_created) { @@ -186,8 +193,7 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) uint64_t *pml4e, *pdpe, *pde; uint64_t *pte; - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, - "Unknown or unsupported guest mode, mode: 0x%x", vm->mode); + assert_supported_guest_mode(vm); TEST_ASSERT((vaddr % pg_size) == 0, "Virtual address not aligned,\n" @@ -273,11 +279,14 @@ uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, { uint64_t *pml4e, *pdpe, *pde; + TEST_ASSERT( + !vm->arch.is_pt_protected, + "Protected guests have their page tables protected so gva2gpa conversions are not possible."); + TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM, "Invalid PG_LEVEL_* '%d'", *level); - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + assert_supported_guest_mode(vm); TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)), "Invalid virtual address, vaddr: 0x%lx", @@ -543,6 +552,7 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) kvm_setup_gdt(vm, &sregs.gdt); switch (vm->mode) { + case VM_MODE_PXXV48_4K_SEV: case VM_MODE_PXXV48_4K: sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR; @@ -566,6 +576,10 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) void kvm_arch_vm_post_create(struct kvm_vm *vm) { vm_create_irqchip(vm); + + if (vm->mode == VM_MODE_PXXV48_4K_SEV) { + sev_vm_init(vm); + } } struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, @@ -1050,6 +1064,25 @@ void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits) } } +static void configure_sev_pte_masks(struct kvm_vm *vm) +{ + uint32_t eax, ebx, ecx, edx, enc_bit; + + cpuid(CPUID_MEM_ENC_LEAF, &eax, &ebx, &ecx, &edx); + enc_bit = ebx & CPUID_EBX_CBIT_MASK; + + vm->arch.c_bit = 1ULL << enc_bit; + vm->protected = true; + vm->gpa_protected_mask = vm->arch.c_bit; +} + +void kvm_init_vm_address_properties(struct kvm_vm *vm) +{ + if (vm->mode == VM_MODE_PXXV48_4K_SEV) { + configure_sev_pte_masks(vm); + } +} + static void set_idt_entry(struct kvm_vm *vm, int vector, unsigned long addr, int dpl, unsigned short selector) { diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev.c b/tools/testing/selftests/kvm/lib/x86_64/sev.c new file mode 100644 index 000000000000..3e20f15dd098 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/x86_64/sev.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Helpers used for SEV guests + * + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include +#include + +#include "kvm_util.h" +#include "svm_util.h" +#include "linux/psp-sev.h" +#include "processor.h" +#include "sev.h" + +#define SEV_FW_REQ_VER_MAJOR 0 +#define SEV_FW_REQ_VER_MINOR 17 + +enum sev_guest_state { + SEV_GSTATE_UNINIT = 0, + SEV_GSTATE_LUPDATE, + SEV_GSTATE_LSECRET, + SEV_GSTATE_RUNNING, +}; + +static void sev_ioctl(int cmd, void *data) +{ + int ret; + struct sev_issue_cmd arg; + + arg.cmd = cmd; + arg.data = (unsigned long)data; + ret = ioctl(open_sev_dev_path_or_exit(), SEV_ISSUE_CMD, &arg); + TEST_ASSERT(ret == 0, "SEV ioctl %d failed, error: %d, fw_error: %d", + cmd, ret, arg.error); +} + +static void kvm_sev_ioctl(struct kvm_vm *vm, int cmd, void *data) +{ + struct kvm_sev_cmd arg = {0}; + int ret; + + arg.id = cmd; + arg.sev_fd = open_sev_dev_path_or_exit(); + arg.data = (__u64)data; + + ret = ioctl(vm->fd, KVM_MEMORY_ENCRYPT_OP, &arg); + TEST_ASSERT( + ret == 0, + "SEV KVM ioctl %d failed, rc: %i errno: %i (%s), fw_error: %d", + cmd, ret, errno, strerror(errno), arg.error); +} + +static void sev_register_user_region(struct kvm_vm *vm, struct userspace_mem_region *region) +{ + struct kvm_enc_region range = {0}; + int ret; + + range.addr = (__u64)region->region.userspace_addr; + ; + range.size = region->region.memory_size; + + ret = ioctl(vm->fd, KVM_MEMORY_ENCRYPT_REG_REGION, &range); + TEST_ASSERT(ret == 0, "failed to register user range, errno: %i\n", + errno); +} + +static void sev_launch_update_data(struct kvm_vm *vm, vm_paddr_t gpa, uint64_t size) +{ + struct kvm_sev_launch_update_data ksev_update_data = {0}; + + pr_debug("%s: addr: 0x%lx, size: %lu\n", __func__, gpa, size); + + ksev_update_data.uaddr = (__u64)addr_gpa2hva(vm, gpa); + ksev_update_data.len = size; + + kvm_sev_ioctl(vm, KVM_SEV_LAUNCH_UPDATE_DATA, &ksev_update_data); +} + + +/* + * Iterate over set ranges within sparsebit @s. In each iteration, + * @range_begin and @range_end will take the beginning and end of the set + * range, which are of type sparsebit_idx_t. + * + * For example, if the range [3, 7] (inclusive) is set, within the + * iteration,@range_begin will take the value 3 and @range_end will take + * the value 7. + * + * Ensure that there is at least one bit set before using this macro with + * sparsebit_any_set(), because sparsebit_first_set() will abort if none + * are set. + */ +#define sparsebit_for_each_set_range(s, range_begin, range_end) \ + for (range_begin = sparsebit_first_set(s), \ + range_end = \ + sparsebit_next_clear(s, range_begin) - 1; \ + range_begin && range_end; \ + range_begin = sparsebit_next_set(s, range_end), \ + range_end = \ + sparsebit_next_clear(s, range_begin) - 1) + +/* + * sparsebit_next_clear() can return 0 if [x, 2**64-1] are all set, and the + * -1 would then cause an underflow back to 2**64 - 1. This is expected and + * correct. + * + * If the last range in the sparsebit is [x, y] and we try to iterate, + * sparsebit_next_set() will return 0, and sparsebit_next_clear() will try + * and find the first range, but that's correct because the condition + * expression would cause us to quit the loop. + */ +static void encrypt_region(struct kvm_vm *vm, struct userspace_mem_region *region) +{ + const struct sparsebit *protected_phy_pages = + region->protected_phy_pages; + const vm_paddr_t gpa_base = region->region.guest_phys_addr; + const sparsebit_idx_t lowest_page_in_region = gpa_base >> vm->page_shift; + + sparsebit_idx_t i; + sparsebit_idx_t j; + + if (!sparsebit_any_set(protected_phy_pages)) + return; + + sev_register_user_region(vm, region); + + sparsebit_for_each_set_range(protected_phy_pages, i, j) { + const uint64_t size_to_load = (j - i + 1) * vm->page_size; + const uint64_t offset = (i - lowest_page_in_region) * vm->page_size; + const uint64_t gpa = gpa_base + offset; + + sev_launch_update_data(vm, gpa, size_to_load); + } +} + +static void sev_encrypt(struct kvm_vm *vm) +{ + int ctr; + struct userspace_mem_region *region; + + hash_for_each(vm->regions.slot_hash, ctr, region, slot_node) { + encrypt_region(vm, region); + } + + vm->arch.is_pt_protected = true; +} + +bool is_kvm_sev_supported(void) +{ + struct sev_user_data_status sev_status; + + sev_ioctl(SEV_PLATFORM_STATUS, &sev_status); + + if (!(sev_status.api_major > SEV_FW_REQ_VER_MAJOR || + (sev_status.api_major == SEV_FW_REQ_VER_MAJOR && + sev_status.api_minor >= SEV_FW_REQ_VER_MINOR))) { + pr_info("SEV FW version too old. Have API %d.%d (build: %d), need %d.%d, skipping test.\n", + sev_status.api_major, sev_status.api_minor, + sev_status.build, SEV_FW_REQ_VER_MAJOR, + SEV_FW_REQ_VER_MINOR); + return false; + } + + return true; +} + +static void sev_vm_launch(struct kvm_vm *vm, uint32_t policy) +{ + struct kvm_sev_launch_start ksev_launch_start = {0}; + struct kvm_sev_guest_status ksev_status; + + ksev_launch_start.policy = policy; + kvm_sev_ioctl(vm, KVM_SEV_LAUNCH_START, &ksev_launch_start); + kvm_sev_ioctl(vm, KVM_SEV_GUEST_STATUS, &ksev_status); + TEST_ASSERT(ksev_status.policy == policy, "Incorrect guest policy."); + TEST_ASSERT(ksev_status.state == SEV_GSTATE_LUPDATE, + "Unexpected guest state: %d", ksev_status.state); + + ucall_init(vm, 0); + + sev_encrypt(vm); +} + +static void sev_vm_launch_measure(struct kvm_vm *vm, uint8_t *measurement) +{ + struct kvm_sev_launch_measure ksev_launch_measure; + struct kvm_sev_guest_status ksev_guest_status; + + ksev_launch_measure.len = 256; + ksev_launch_measure.uaddr = (__u64)measurement; + kvm_sev_ioctl(vm, KVM_SEV_LAUNCH_MEASURE, &ksev_launch_measure); + + kvm_sev_ioctl(vm, KVM_SEV_GUEST_STATUS, &ksev_guest_status); + TEST_ASSERT(ksev_guest_status.state == SEV_GSTATE_LSECRET, + "Unexpected guest state: %d", ksev_guest_status.state); +} + +static void sev_vm_launch_finish(struct kvm_vm *vm) +{ + struct kvm_sev_guest_status ksev_status; + + kvm_sev_ioctl(vm, KVM_SEV_GUEST_STATUS, &ksev_status); + TEST_ASSERT(ksev_status.state == SEV_GSTATE_LUPDATE || + ksev_status.state == SEV_GSTATE_LSECRET, + "Unexpected guest state: %d", ksev_status.state); + + kvm_sev_ioctl(vm, KVM_SEV_LAUNCH_FINISH, NULL); + + kvm_sev_ioctl(vm, KVM_SEV_GUEST_STATUS, &ksev_status); + TEST_ASSERT(ksev_status.state == SEV_GSTATE_RUNNING, + "Unexpected guest state: %d", ksev_status.state); +} + +static void sev_vm_measure(struct kvm_vm *vm) +{ + uint8_t measurement[512]; + int i; + + sev_vm_launch_measure(vm, measurement); + + /* TODO: Validate the measurement is as expected. */ + pr_debug("guest measurement: "); + for (i = 0; i < 32; ++i) + pr_debug("%02x", measurement[i]); + pr_debug("\n"); +} + +void sev_vm_init(struct kvm_vm *vm) +{ + kvm_sev_ioctl(vm, KVM_SEV_INIT, NULL); +} + +struct kvm_vm *vm_sev_create_with_one_vcpu(uint32_t policy, void *guest_code, + struct kvm_vcpu **cpu) +{ + enum vm_guest_mode mode = VM_MODE_PXXV48_4K_SEV; + struct kvm_vm *vm; + struct kvm_vcpu *cpus[1]; + + vm = __vm_create_with_vcpus(mode, 1, 0, guest_code, cpus); + *cpu = cpus[0]; + + sev_vm_launch(vm, policy); + + sev_vm_measure(vm); + + sev_vm_launch_finish(vm); + + pr_info("SEV guest created, policy: 0x%x\n", policy); + + return vm; +}