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Subject[PATCH v2 13/13] KVM: selftests: add SEV-ES boot tests
Date
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;
}
--
2.25.1
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