Extend the existing SEV boot tests to also cover SEV-ES guests. Also add some tests for handling #VC exceptions for cpuid instructions using both MSR-based and GHCB-based vmgexits.
Signed-off-by: Michael Roth michael.roth@amd.com --- .../selftests/kvm/x86_64/sev_all_boot_test.c | 63 ++++++++++++++++++- 1 file changed, 62 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c b/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c index 329a740a7cb2..63c26bf4ecb6 100644 --- a/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c +++ b/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c @@ -18,6 +18,7 @@ #include "svm_util.h" #include "linux/psp-sev.h" #include "sev.h" +#include "sev_exitlib.h"
#define VCPU_ID 2 #define PAGE_SIZE 4096 @@ -31,6 +32,10 @@
#define TOTAL_PAGES (512 + SHARED_PAGES + PRIVATE_PAGES)
+/* Globals for use by #VC handler. */ +static void *ghcb0_gva; +static vm_paddr_t ghcb0_gpa; + static void fill_buf(uint8_t *buf, size_t pages, size_t stride, uint8_t val) { int i, j; @@ -165,6 +170,47 @@ guest_sev_code(struct ucall *uc, uint8_t *shared_buf, uint8_t *private_buf) guest_test_done(uc); }
+static void vc_handler(struct ex_regs *regs) +{ + sev_es_handle_vc(ghcb0_gva, ghcb0_gpa, regs); +} + +static void __attribute__((__flatten__)) +guest_sev_es_code(struct ucall *uc, uint8_t *shared_buf, + uint8_t *private_buf, uint64_t ghcb_gpa, void *ghcb_gva) +{ + uint32_t eax, ebx, ecx, edx; + uint64_t sev_status; + + guest_test_start(uc); + +again: + /* Check CPUID values via GHCB MSR protocol. */ + eax = 0x8000001f; + ecx = 0; + cpuid(&eax, &ebx, &ecx, &edx); + + /* Check SEV bit. */ + GUEST_SHARED_ASSERT(uc, eax & (1 << 1)); + /* Check SEV-ES bit. */ + GUEST_SHARED_ASSERT(uc, eax & (1 << 3)); + + if (!ghcb0_gva) { + ghcb0_gva = ghcb_gva; + ghcb0_gpa = ghcb_gpa; + /* Check CPUID bits again using GHCB-based protocol. */ + goto again; + } + + /* Check SEV and SEV-ES enabled bits (bits 0 and 1, respectively). */ + sev_status = rdmsr(MSR_AMD64_SEV); + GUEST_SHARED_ASSERT(uc, (sev_status & 0x3) == 3); + + guest_test_common(uc, shared_buf, private_buf); + + guest_test_done(uc); +} + static struct sev_vm * setup_test_common(void *guest_code, uint64_t policy, struct ucall **uc, uint8_t **shared_buf, uint8_t **private_buf) @@ -200,7 +246,18 @@ setup_test_common(void *guest_code, uint64_t policy, struct ucall **uc, fill_buf(*private_buf, PRIVATE_PAGES, PAGE_STRIDE, 0x42);
/* Set up guest params. */ - vcpu_args_set(vm, VCPU_ID, 4, uc_vaddr, shared_vaddr, private_vaddr); + if (policy & SEV_POLICY_ES) { + vm_vaddr_t ghcb_vaddr = vm_vaddr_alloc_shared(vm, PAGE_SIZE, PAGE_SIZE); + + vcpu_args_set(vm, VCPU_ID, 6, uc_vaddr, shared_vaddr, private_vaddr, + addr_gva2gpa(vm, ghcb_vaddr), ghcb_vaddr); + /* Set up VC handler. */ + vm_init_descriptor_tables(vm); + vm_install_exception_handler(vm, 29, vc_handler); + vcpu_init_descriptor_tables(vm, VCPU_ID); + } else { + vcpu_args_set(vm, VCPU_ID, 4, uc_vaddr, shared_vaddr, private_vaddr); + }
/* * Hand these back to test harness, translation is needed now since page @@ -251,5 +308,9 @@ int main(int argc, char *argv[]) test_sev(guest_sev_code, SEV_POLICY_NO_DBG); test_sev(guest_sev_code, 0);
+ /* SEV-ES tests */ + test_sev(guest_sev_es_code, SEV_POLICY_ES | SEV_POLICY_NO_DBG); + test_sev(guest_sev_es_code, SEV_POLICY_ES); + return 0; }