selftest: kvm: Reorder vcpu_load_state steps for AMX

mainline inclusion
from mainline-v5.17-rc1
commit 551447cf
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5RQLJ
CVE: NA

Intel-SIG: commit 551447cf selftest: kvm: Reorder vcpu_load_state steps for AMX.

--------------------------------

For AMX support it is recommended to load XCR0 after XFD, so
that KVM does not see XFD=0, XCR=1 for a save state that will
eventually be disabled (which would lead to premature allocation
of the space required for that save state).

It is also required to load XSAVE data after XCR0 and XFD, so
that KVM can trigger allocation of the extra space required to
store AMX state.

Adjust vcpu_load_state to obey these new requirements.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NYang Zhong <yang.zhong@intel.com>
Message-Id: <20211223145322.2914028-2-yang.zhong@intel.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NLin Wang <lin.x.wang@intel.com>

tools/testing/selftests/kvm/lib/x86_64/processor.c

@@ -1105,24 +1105,25 @@ void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *s
 	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
 	int r;
 
-	r = ioctl(vcpu->fd, KVM_SET_XSAVE, state->xsave);
-        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XSAVE, r: %i",
+	r = ioctl(vcpu->fd, KVM_SET_SREGS, &state->sregs);
+	TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_SREGS, r: %i",
                 r);
 
+	r = ioctl(vcpu->fd, KVM_SET_MSRS, &state->msrs);
+	TEST_ASSERT(r == state->msrs.nmsrs,
+		"Unexpected result from KVM_SET_MSRS, r: %i (failed at %x)",
+		r, r == state->msrs.nmsrs ? -1 : state->msrs.entries[r].index);
+
 	if (kvm_check_cap(KVM_CAP_XCRS)) {
 		r = ioctl(vcpu->fd, KVM_SET_XCRS, &state->xcrs);
 		TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XCRS, r: %i",
 			    r);
 	}
 
-	r = ioctl(vcpu->fd, KVM_SET_SREGS, &state->sregs);
-        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_SREGS, r: %i",
+	r = ioctl(vcpu->fd, KVM_SET_XSAVE, state->xsave);
+	TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XSAVE, r: %i",
                 r);
 
-	r = ioctl(vcpu->fd, KVM_SET_MSRS, &state->msrs);
-        TEST_ASSERT(r == state->msrs.nmsrs, "Unexpected result from KVM_SET_MSRS, r: %i (failed at %x)",
-                r, r == state->msrs.nmsrs ? -1 : state->msrs.entries[r].index);
-
 	r = ioctl(vcpu->fd, KVM_SET_VCPU_EVENTS, &state->events);
         TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_VCPU_EVENTS, r: %i",
                 r);