KVM: selftests: VMX preemption timer migration test

When a nested VM with a VMX-preemption timer is migrated, verify that the
nested VM and its parent VM observe the VMX-preemption timer exit close to
the original expiration deadline.

Signed-off-by: Makarand Sonare <makarandsonare@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200526215107.205814-3-makarandsonare@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 36 insertions, 4 deletions

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index e244c6ecfc1d..919e161dd289 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -314,6 +314,8 @@ void ucall_uninit(struct kvm_vm *vm);
 void ucall(uint64_t cmd, int nargs, ...);
 uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 
+#define GUEST_SYNC_ARGS(stage, arg1, arg2, arg3, arg4)	\
+				ucall(UCALL_SYNC, 6, "hello", stage, arg1, arg2, arg3, arg4)
 #define GUEST_SYNC(stage)	ucall(UCALL_SYNC, 2, "hello", stage)
 #define GUEST_DONE()		ucall(UCALL_DONE, 0)
 #define __GUEST_ASSERT(_condition, _nargs, _args...) do {	\
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 7428513a4c68..7cb19eca6c72 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -79,13 +79,16 @@ static inline uint64_t get_desc64_base(const struct desc64 *desc)
 static inline uint64_t rdtsc(void)
 {
 	uint32_t eax, edx;
-
+	uint32_t tsc_val;
 	/*
 	 * The lfence is to wait (on Intel CPUs) until all previous
-	 * instructions have been executed.
+	 * instructions have been executed. If software requires RDTSC to be
+	 * executed prior to execution of any subsequent instruction, it can
+	 * execute LFENCE immediately after RDTSC
 	 */
-	__asm__ __volatile__("lfence; rdtsc" : "=a"(eax), "=d"(edx));
-	return ((uint64_t)edx) << 32 | eax;
+	__asm__ __volatile__("lfence; rdtsc; lfence" : "=a"(eax), "=d"(edx));
+	tsc_val = ((uint64_t)edx) << 32 | eax;
+	return tsc_val;
 }
 
 static inline uint64_t rdtscp(uint32_t *aux)
diff --git a/tools/testing/selftests/kvm/include/x86_64/vmx.h b/tools/testing/selftests/kvm/include/x86_64/vmx.h
index 3d27069b9ed9..ccff3e6e2704 100644
--- a/tools/testing/selftests/kvm/include/x86_64/vmx.h
+++ b/tools/testing/selftests/kvm/include/x86_64/vmx.h
@@ -575,6 +575,33 @@ struct vmx_pages {
 	void *eptp;
 };
 
+union vmx_basic {
+	u64 val;
+	struct {
+		u32 revision;
+		u32	size:13,
+			reserved1:3,
+			width:1,
+			dual:1,
+			type:4,
+			insouts:1,
+			ctrl:1,
+			vm_entry_exception_ctrl:1,
+			reserved2:7;
+	};
+};
+
+union vmx_ctrl_msr {
+	u64 val;
+	struct {
+		u32 set, clr;
+	};
+};
+
+union vmx_basic basic;
+union vmx_ctrl_msr ctrl_pin_rev;
+union vmx_ctrl_msr ctrl_exit_rev;
+
 struct vmx_pages *vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva);
 bool prepare_for_vmx_operation(struct vmx_pages *vmx);
 void prepare_vmcs(struct vmx_pages *vmx, void *guest_rip, void *guest_rsp);