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-rw-r--r--tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c b/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c
new file mode 100644
index 000000000000..905bd5ae4431
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * XCR0 cpuid test
+ *
+ * Copyright (C) 2022, Google LLC.
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "processor.h"
+
+/*
+ * Assert that architectural dependency rules are satisfied, e.g. that AVX is
+ * supported if and only if SSE is supported.
+ */
+#define ASSERT_XFEATURE_DEPENDENCIES(supported_xcr0, xfeatures, dependencies) \
+do { \
+ uint64_t __supported = (supported_xcr0) & ((xfeatures) | (dependencies)); \
+ \
+ GUEST_ASSERT_3((__supported & (xfeatures)) != (xfeatures) || \
+ __supported == ((xfeatures) | (dependencies)), \
+ __supported, (xfeatures), (dependencies)); \
+} while (0)
+
+/*
+ * Assert that KVM reports a sane, usable as-is XCR0. Architecturally, a CPU
+ * isn't strictly required to _support_ all XFeatures related to a feature, but
+ * at the same time XSETBV will #GP if bundled XFeatures aren't enabled and
+ * disabled coherently. E.g. a CPU can technically enumerate supported for
+ * XTILE_CFG but not XTILE_DATA, but attempting to enable XTILE_CFG without
+ * XTILE_DATA will #GP.
+ */
+#define ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0, xfeatures) \
+do { \
+ uint64_t __supported = (supported_xcr0) & (xfeatures); \
+ \
+ GUEST_ASSERT_2(!__supported || __supported == (xfeatures), \
+ __supported, (xfeatures)); \
+} while (0)
+
+static void guest_code(void)
+{
+ uint64_t xcr0_reset;
+ uint64_t supported_xcr0;
+ int i, vector;
+
+ set_cr4(get_cr4() | X86_CR4_OSXSAVE);
+
+ xcr0_reset = xgetbv(0);
+ supported_xcr0 = this_cpu_supported_xcr0();
+
+ GUEST_ASSERT(xcr0_reset == XFEATURE_MASK_FP);
+
+ /* Check AVX */
+ ASSERT_XFEATURE_DEPENDENCIES(supported_xcr0,
+ XFEATURE_MASK_YMM,
+ XFEATURE_MASK_SSE);
+
+ /* Check MPX */
+ ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0,
+ XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
+
+ /* Check AVX-512 */
+ ASSERT_XFEATURE_DEPENDENCIES(supported_xcr0,
+ XFEATURE_MASK_AVX512,
+ XFEATURE_MASK_SSE | XFEATURE_MASK_YMM);
+ ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0,
+ XFEATURE_MASK_AVX512);
+
+ /* Check AMX */
+ ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0,
+ XFEATURE_MASK_XTILE);
+
+ vector = xsetbv_safe(0, supported_xcr0);
+ GUEST_ASSERT_2(!vector, supported_xcr0, vector);
+
+ for (i = 0; i < 64; i++) {
+ if (supported_xcr0 & BIT_ULL(i))
+ continue;
+
+ vector = xsetbv_safe(0, supported_xcr0 | BIT_ULL(i));
+ GUEST_ASSERT_3(vector == GP_VECTOR, supported_xcr0, vector, BIT_ULL(i));
+ }
+
+ GUEST_DONE();
+}
+
+int main(int argc, char *argv[])
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_run *run;
+ struct kvm_vm *vm;
+ struct ucall uc;
+
+ TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVE));
+
+ vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+ run = vcpu->run;
+
+ vm_init_descriptor_tables(vm);
+ vcpu_init_descriptor_tables(vcpu);
+
+ while (1) {
+ vcpu_run(vcpu);
+
+ TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
+ "Unexpected exit reason: %u (%s),\n",
+ run->exit_reason,
+ exit_reason_str(run->exit_reason));
+
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_ABORT:
+ REPORT_GUEST_ASSERT_3(uc, "0x%lx 0x%lx 0x%lx");
+ break;
+ case UCALL_DONE:
+ goto done;
+ default:
+ TEST_FAIL("Unknown ucall %lu", uc.cmd);
+ }
+ }
+
+done:
+ kvm_vm_free(vm);
+ return 0;
+}