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AJvYcCXD3qXsjpdgdSP0X6m7aBbMytu3E25EdNkFWuXubCLqsA2rRRgIxjRlNyOB2WvDfXLHcaARZX/OV066i0E=@vger.kernel.org X-Gm-Message-State: AOJu0YxwwqYn+vCI5tZQTdGFwR+K7Ig769PG/8wOCrGMrzb/SBCDov0R 5QGUoDs7YjBOpFNANj4l2z03bUrcr+8rTqz7IfjvVDGkeE1hsX0wpF2OBGYwmSLqXx1zFbcUd03 Subn5U3rp1ehXVaBxo7CV+pRk6w== X-Received: from pglu12.prod.google.com ([2002:a63:140c:0:b0:c76:3cb2:929c]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:1642:b0:35c:17ae:4e2f with SMTP id 98e67ed59e1d1-35c30155f02mr371172a91.33.1774568227491; Thu, 26 Mar 2026 16:37:07 -0700 (PDT) Date: Thu, 26 Mar 2026 16:36:43 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> X-Mailer: git-send-email 2.53.0.1018.g2bb0e51243-goog Message-ID: <92f152f8df72bbfabf69ecfa55ee65287a018cb3.1774568083.git.ackerleytng@google.com> Subject: [POC PATCH 5/6] KVM: selftests: Test conversions for SNP From: Ackerley Tng To: ackerleytng@google.com Cc: aik@amd.com, akpm@linux-foundation.org, andrew.jones@linux.dev, aneesh.kumar@kernel.org, axelrasmussen@google.com, baohua@kernel.org, bhe@redhat.com, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@linux.intel.com, chrisl@kernel.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, forkloop@google.com, hpa@zytor.com, ira.weiny@intel.com, jgg@ziepe.ca, jmattson@google.com, jroedel@suse.de, jthoughton@google.com, kasong@tencent.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, michael.roth@amd.com, mingo@redhat.com, nphamcs@gmail.com, oupton@kernel.org, pankaj.gupta@amd.com, pbonzini@redhat.com, pratyush@kernel.org, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, seanjc@google.com, shikemeng@huaweicloud.com, shivankg@amd.com, shuah@kernel.org, skhan@linuxfoundation.org, steven.price@arm.com, suzuki.poulose@arm.com, tabba@google.com, tglx@kernel.org, vannapurve@google.com, vbabka@kernel.org, weixugc@google.com, willy@infradead.org, wyihan@google.com, x86@kernel.org, yan.y.zhao@intel.com, yuanchu@google.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Signed-off-by: Ackerley Tng --- .../selftests/kvm/x86/sev_smoke_test.c | 190 +++++++++++++++++- 1 file changed, 185 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testi= ng/selftests/kvm/x86/sev_smoke_test.c index 7e69da01cecf4..c40c359f78901 100644 --- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c +++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c @@ -253,17 +253,197 @@ static void test_sev_smoke(void *guest, uint32_t typ= e, uint64_t policy) } } =20 +#define GHCB_MSR_REG_GPA_REQ 0x012 +#define GHCB_MSR_REG_GPA_REQ_VAL(v) \ + /* GHCBData[63:12] */ \ + (((u64)((v) & GENMASK_ULL(51, 0)) << 12) | \ + /* GHCBData[11:0] */ \ + GHCB_MSR_REG_GPA_REQ) + +#define GHCB_MSR_REG_GPA_RESP 0x013 +#define GHCB_MSR_REG_GPA_RESP_VAL(v) \ + /* GHCBData[63:12] */ \ + (((u64)(v) & GENMASK_ULL(63, 12)) >> 12) + +#define GHCB_DATA_LOW 12 +#define GHCB_MSR_INFO_MASK (BIT_ULL(GHCB_DATA_LOW) - 1) +#define GHCB_RESP_CODE(v) ((v) & GHCB_MSR_INFO_MASK) + +/* + * SNP Page State Change Operation + * + * GHCBData[55:52] - Page operation: + * 0x0001 Page assignment, Private + * 0x0002 Page assignment, Shared + */ +enum psc_op { + SNP_PAGE_STATE_PRIVATE =3D 1, + SNP_PAGE_STATE_SHARED, +}; + +#define GHCB_MSR_PSC_REQ 0x014 +#define GHCB_MSR_PSC_REQ_GFN(gfn, op) \ + /* GHCBData[55:52] */ \ + (((u64)((op) & 0xf) << 52) | \ + /* GHCBData[51:12] */ \ + ((u64)((gfn) & GENMASK_ULL(39, 0)) << 12) | \ + /* GHCBData[11:0] */ \ + GHCB_MSR_PSC_REQ) + +#define GHCB_MSR_PSC_RESP 0x015 +#define GHCB_MSR_PSC_RESP_VAL(val) \ + /* GHCBData[63:32] */ \ + (((u64)(val) & GENMASK_ULL(63, 32)) >> 32) + +static u64 ghcb_gpa; +static void snp_register_ghcb(void) +{ + u64 ghcb_pfn =3D ghcb_gpa >> PAGE_SHIFT; + u64 val; + + GUEST_ASSERT(ghcb_gpa); + + wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_REG_GPA_REQ_VAL(ghcb_gpa >> PAGE_SH= IFT)); + vmgexit(); + + val =3D rdmsr(MSR_AMD64_SEV_ES_GHCB); + GUEST_ASSERT_EQ(GHCB_RESP_CODE(val), GHCB_MSR_REG_GPA_RESP); + GUEST_ASSERT_EQ(GHCB_MSR_REG_GPA_RESP_VAL(val), ghcb_pfn); +} + +static void snp_page_state_change(u64 gpa, enum psc_op op) +{ + u64 val; + + wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_PSC_REQ_GFN(gpa >> PAGE_SHIFT, op)); + vmgexit(); + + val =3D rdmsr(MSR_AMD64_SEV_ES_GHCB); + GUEST_ASSERT_EQ(GHCB_RESP_CODE(val), GHCB_MSR_PSC_RESP); + GUEST_ASSERT_EQ(GHCB_MSR_PSC_RESP_VAL(val), 0); +} + +#define RMP_PG_SIZE_4K 0 +static inline void pvalidate(void *vaddr, bool validate) +{ + bool no_rmpupdate; + int rc; + + /* "pvalidate" mnemonic support in binutils 2.36 and newer */ + asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t" + : "=3D@ccc"(no_rmpupdate), "=3Da"(rc) + : "a"(vaddr), "c"(RMP_PG_SIZE_4K), "d"(validate) + : "memory", "cc"); + + GUEST_ASSERT(!no_rmpupdate); + GUEST_ASSERT_EQ(rc, 0); +} + +#define CONVERSION_TEST_VALUE_SHARED_1 0xab +#define CONVERSION_TEST_VALUE_SHARED_2 0xcd +#define CONVERSION_TEST_VALUE_PRIVATE 0xef +#define CONVERSION_TEST_VALUE_SHARED_3 0xbc +static void guest_code_conversion(u8 *test_shared_gva, u8 *test_private_gv= a, u64 test_gpa) +{ + snp_register_ghcb(); + + GUEST_ASSERT_EQ(READ_ONCE(*test_shared_gva), CONVERSION_TEST_VALUE_SHARED= _1); + WRITE_ONCE(*test_shared_gva, CONVERSION_TEST_VALUE_SHARED_2); + + snp_page_state_change(test_gpa, SNP_PAGE_STATE_PRIVATE); + pvalidate(test_private_gva, true); + + WRITE_ONCE(*test_private_gva, CONVERSION_TEST_VALUE_PRIVATE); + GUEST_ASSERT_EQ(READ_ONCE(*test_private_gva), CONVERSION_TEST_VALUE_PRIVA= TE); + + pvalidate(test_private_gva, false); + snp_page_state_change(test_gpa, SNP_PAGE_STATE_SHARED); + + WRITE_ONCE(*test_shared_gva, CONVERSION_TEST_VALUE_SHARED_3); + + wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_TERM_REQ); + vmgexit(); +} + +static void test_conversion(uint64_t policy) +{ + vm_vaddr_t test_private_gva; + vm_vaddr_t test_shared_gva; + struct kvm_vcpu *vcpu; + vm_vaddr_t ghcb_gva; + vm_paddr_t test_gpa; + struct kvm_vm *vm; + void *ghcb_hva; + void *test_hva; + + vm =3D vm_sev_create_with_one_vcpu(KVM_X86_SNP_VM, guest_code_conversion,= &vcpu); + + ghcb_gva =3D vm_vaddr_alloc_shared(vm, PAGE_SIZE, KVM_UTIL_MIN_VADDR, + MEM_REGION_TEST_DATA); + ghcb_hva =3D addr_gva2hva(vm, ghcb_gva); + ghcb_gpa =3D addr_gva2gpa(vm, ghcb_gva); + sync_global_to_guest(vm, ghcb_gpa); + + test_shared_gva =3D vm_vaddr_alloc_shared(vm, PAGE_SIZE, KVM_UTIL_MIN_VAD= DR, + MEM_REGION_TEST_DATA); + test_hva =3D addr_gva2hva(vm, test_shared_gva); + test_gpa =3D addr_gva2gpa(vm, test_shared_gva); + + test_private_gva =3D vm_vaddr_unused_gap(vm, PAGE_SIZE, KVM_UTIL_MIN_VADD= R); + ___virt_pg_map(vm, &vm->mmu, test_private_gva, test_gpa, PG_SIZE_4K, true= ); + + vcpu_args_set(vcpu, 3, test_shared_gva, test_private_gva, test_gpa); + + vm_sev_launch(vm, policy, NULL); + + WRITE_ONCE(*(u8 *)test_hva, CONVERSION_TEST_VALUE_SHARED_1); + + fprintf(stderr, "ghcb_hva=3D%p ghcb_gpa=3D%lx ghcb_gva=3D%lx\n", ghcb_hva= , ghcb_gpa, ghcb_gva); + fprintf(stderr, "test_hva=3D%p test_gpa=3D%lx test_private_gva=3D%lx test= _shared_gva=3D%lx\n", test_hva, test_gpa, test_private_gva, test_shared_gva= ); + + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_HYPERCALL); + TEST_ASSERT_EQ(vcpu->run->hypercall.nr, KVM_HC_MAP_GPA_RANGE); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[0], test_gpa); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[1], 1); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[2], KVM_MAP_GPA_RANGE_ENCRYPTED = | KVM_MAP_GPA_RANGE_PAGE_SZ_4K); + + vm_mem_set_private(vm, test_gpa, PAGE_SIZE, KVM_SET_MEMORY_ATTRIBUTES2_MO= DE_UNSPECIFIED); + + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_HYPERCALL); + TEST_ASSERT_EQ(vcpu->run->hypercall.nr, KVM_HC_MAP_GPA_RANGE); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[0], test_gpa); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[1], 1); + TEST_ASSERT_EQ(vcpu->run->hypercall.args[2], KVM_MAP_GPA_RANGE_DECRYPTED = | KVM_MAP_GPA_RANGE_PAGE_SZ_4K); + + vm_mem_set_shared(vm, test_gpa, PAGE_SIZE, KVM_SET_MEMORY_ATTRIBUTES2_MOD= E_UNSPECIFIED); + + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SYSTEM_EVENT); + TEST_ASSERT_EQ(vcpu->run->system_event.type, KVM_SYSTEM_EVENT_SEV_TERM); + TEST_ASSERT_EQ(vcpu->run->system_event.ndata, 1); + TEST_ASSERT_EQ(vcpu->run->system_event.data[0], GHCB_MSR_TERM_REQ); + + TEST_ASSERT_EQ(*(u8 *)test_hva, CONVERSION_TEST_VALUE_SHARED_3); +} + int main(int argc, char *argv[]) { TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SEV)); =20 - test_sev_smoke(guest_sev_code, KVM_X86_SEV_VM, 0); + // test_sev_smoke(guest_sev_code, KVM_X86_SEV_VM, 0); =20 - if (kvm_cpu_has(X86_FEATURE_SEV_ES)) - test_sev_smoke(guest_sev_es_code, KVM_X86_SEV_ES_VM, SEV_POLICY_ES); + // if (kvm_cpu_has(X86_FEATURE_SEV_ES)) + // test_sev_smoke(guest_sev_es_code, KVM_X86_SEV_ES_VM, SEV_POLICY_ES); =20 - if (kvm_cpu_has(X86_FEATURE_SEV_SNP)) - test_sev_smoke(guest_snp_code, KVM_X86_SNP_VM, snp_default_policy()); + if (kvm_cpu_has(X86_FEATURE_SEV_SNP)) { + test_conversion(snp_default_policy()); + // test_sev_smoke(guest_snp_code, KVM_X86_SNP_VM, snp_default_policy()); + } =20 return 0; } --=20 2.53.0.1018.g2bb0e51243-goog