summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/set_sregs_test.c')
-rw-r--r--tools/testing/selftests/kvm/x86_64/set_sregs_test.c92
1 files changed, 91 insertions, 1 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
index 9f7656184f31..318be0bf77ab 100644
--- a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
@@ -24,16 +24,106 @@
#define VCPU_ID 5
+static void test_cr4_feature_bit(struct kvm_vm *vm, struct kvm_sregs *orig,
+ uint64_t feature_bit)
+{
+ struct kvm_sregs sregs;
+ int rc;
+
+ /* Skip the sub-test, the feature is supported. */
+ if (orig->cr4 & feature_bit)
+ return;
+
+ memcpy(&sregs, orig, sizeof(sregs));
+ sregs.cr4 |= feature_bit;
+
+ rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs);
+ TEST_ASSERT(rc, "KVM allowed unsupported CR4 bit (0x%lx)", feature_bit);
+
+ /* Sanity check that KVM didn't change anything. */
+ vcpu_sregs_get(vm, VCPU_ID, &sregs);
+ TEST_ASSERT(!memcmp(&sregs, orig, sizeof(sregs)), "KVM modified sregs");
+}
+
+static uint64_t calc_cr4_feature_bits(struct kvm_vm *vm)
+{
+ struct kvm_cpuid_entry2 *cpuid_1, *cpuid_7;
+ uint64_t cr4;
+
+ cpuid_1 = kvm_get_supported_cpuid_entry(1);
+ cpuid_7 = kvm_get_supported_cpuid_entry(7);
+
+ cr4 = X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE |
+ X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE | X86_CR4_PGE |
+ X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_OSXMMEXCPT;
+ if (cpuid_7->ecx & CPUID_UMIP)
+ cr4 |= X86_CR4_UMIP;
+ if (cpuid_7->ecx & CPUID_LA57)
+ cr4 |= X86_CR4_LA57;
+ if (cpuid_1->ecx & CPUID_VMX)
+ cr4 |= X86_CR4_VMXE;
+ if (cpuid_1->ecx & CPUID_SMX)
+ cr4 |= X86_CR4_SMXE;
+ if (cpuid_7->ebx & CPUID_FSGSBASE)
+ cr4 |= X86_CR4_FSGSBASE;
+ if (cpuid_1->ecx & CPUID_PCID)
+ cr4 |= X86_CR4_PCIDE;
+ if (cpuid_1->ecx & CPUID_XSAVE)
+ cr4 |= X86_CR4_OSXSAVE;
+ if (cpuid_7->ebx & CPUID_SMEP)
+ cr4 |= X86_CR4_SMEP;
+ if (cpuid_7->ebx & CPUID_SMAP)
+ cr4 |= X86_CR4_SMAP;
+ if (cpuid_7->ecx & CPUID_PKU)
+ cr4 |= X86_CR4_PKE;
+
+ return cr4;
+}
+
int main(int argc, char *argv[])
{
struct kvm_sregs sregs;
struct kvm_vm *vm;
+ uint64_t cr4;
int rc;
/* Tell stdout not to buffer its content */
setbuf(stdout, NULL);
- /* Create VM */
+ /*
+ * Create a dummy VM, specifically to avoid doing KVM_SET_CPUID2, and
+ * use it to verify all supported CR4 bits can be set prior to defining
+ * the vCPU model, i.e. without doing KVM_SET_CPUID2.
+ */
+ vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+ vm_vcpu_add(vm, VCPU_ID);
+
+ vcpu_sregs_get(vm, VCPU_ID, &sregs);
+
+ sregs.cr4 |= calc_cr4_feature_bits(vm);
+ cr4 = sregs.cr4;
+
+ rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs);
+ TEST_ASSERT(!rc, "Failed to set supported CR4 bits (0x%lx)", cr4);
+
+ vcpu_sregs_get(vm, VCPU_ID, &sregs);
+ TEST_ASSERT(sregs.cr4 == cr4, "sregs.CR4 (0x%llx) != CR4 (0x%lx)",
+ sregs.cr4, cr4);
+
+ /* Verify all unsupported features are rejected by KVM. */
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_UMIP);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_LA57);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_VMXE);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_SMXE);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_FSGSBASE);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_PCIDE);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_OSXSAVE);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_SMEP);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_SMAP);
+ test_cr4_feature_bit(vm, &sregs, X86_CR4_PKE);
+ kvm_vm_free(vm);
+
+ /* Create a "real" VM and verify APIC_BASE can be set. */
vm = vm_create_default(VCPU_ID, 0, NULL);
vcpu_sregs_get(vm, VCPU_ID, &sregs);