Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 275 insertions, 0 deletions

diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
new file mode 100644
index 000000000..99bc20224
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018, Red Hat, Inc.
+ *
+ * Tests for Enlightened VMCS, including nested guest state.
+ */
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <linux/bitmap.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+
+#include "vmx.h"
+
+static int ud_count;
+
+static void guest_ud_handler(struct ex_regs *regs)
+{
+	ud_count++;
+	regs->rip += 3; /* VMLAUNCH */
+}
+
+static void guest_nmi_handler(struct ex_regs *regs)
+{
+}
+
+/* Exits to L1 destroy GRPs! */
+static inline void rdmsr_fs_base(void)
+{
+	__asm__ __volatile__ ("mov $0xc0000100, %%rcx; rdmsr" : : :
+			      "rax", "rbx", "rcx", "rdx",
+			      "rsi", "rdi", "r8", "r9", "r10", "r11", "r12",
+			      "r13", "r14", "r15");
+}
+static inline void rdmsr_gs_base(void)
+{
+	__asm__ __volatile__ ("mov $0xc0000101, %%rcx; rdmsr" : : :
+			      "rax", "rbx", "rcx", "rdx",
+			      "rsi", "rdi", "r8", "r9", "r10", "r11", "r12",
+			      "r13", "r14", "r15");
+}
+
+void l2_guest_code(void)
+{
+	GUEST_SYNC(7);
+
+	GUEST_SYNC(8);
+
+	/* Forced exit to L1 upon restore */
+	GUEST_SYNC(9);
+
+	vmcall();
+
+	/* MSR-Bitmap tests */
+	rdmsr_fs_base(); /* intercepted */
+	rdmsr_fs_base(); /* intercepted */
+	rdmsr_gs_base(); /* not intercepted */
+	vmcall();
+	rdmsr_gs_base(); /* intercepted */
+
+	/* Done, exit to L1 and never come back.  */
+	vmcall();
+}
+
+void guest_code(struct vmx_pages *vmx_pages)
+{
+#define L2_GUEST_STACK_SIZE 64
+	unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
+
+	x2apic_enable();
+
+	GUEST_SYNC(1);
+	GUEST_SYNC(2);
+
+	enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
+
+	GUEST_ASSERT(vmx_pages->vmcs_gpa);
+	GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
+	GUEST_SYNC(3);
+	GUEST_ASSERT(load_vmcs(vmx_pages));
+	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
+
+	GUEST_SYNC(4);
+	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
+
+	prepare_vmcs(vmx_pages, l2_guest_code,
+		     &l2_guest_stack[L2_GUEST_STACK_SIZE]);
+
+	GUEST_SYNC(5);
+	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
+	current_evmcs->revision_id = -1u;
+	GUEST_ASSERT(vmlaunch());
+	current_evmcs->revision_id = EVMCS_VERSION;
+	GUEST_SYNC(6);
+
+	vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmreadz(PIN_BASED_VM_EXEC_CONTROL) |
+		PIN_BASED_NMI_EXITING);
+
+	GUEST_ASSERT(!vmlaunch());
+	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
+
+	/*
+	 * NMI forces L2->L1 exit, resuming L2 and hope that EVMCS is
+	 * up-to-date (RIP points where it should and not at the beginning
+	 * of l2_guest_code(). GUEST_SYNC(9) checkes that.
+	 */
+	GUEST_ASSERT(!vmresume());
+
+	GUEST_SYNC(10);
+
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
+	current_evmcs->guest_rip += 3; /* vmcall */
+
+	/* Intercept RDMSR 0xc0000100 */
+	vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmreadz(CPU_BASED_VM_EXEC_CONTROL) |
+		CPU_BASED_USE_MSR_BITMAPS);
+	set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400);
+	GUEST_ASSERT(!vmresume());
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
+	current_evmcs->guest_rip += 2; /* rdmsr */
+
+	/* Enable enlightened MSR bitmap */
+	current_evmcs->hv_enlightenments_control.msr_bitmap = 1;
+	GUEST_ASSERT(!vmresume());
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
+	current_evmcs->guest_rip += 2; /* rdmsr */
+
+	/* Intercept RDMSR 0xc0000101 without telling KVM about it */
+	set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400);
+	/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
+	current_evmcs->hv_clean_fields |= HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
+	GUEST_ASSERT(!vmresume());
+	/* Make sure we don't see EXIT_REASON_MSR_READ here so eMSR bitmap works */
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
+	current_evmcs->guest_rip += 3; /* vmcall */
+
+	/* Now tell KVM we've changed MSR-Bitmap */
+	current_evmcs->hv_clean_fields &= ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
+	GUEST_ASSERT(!vmresume());
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
+	current_evmcs->guest_rip += 2; /* rdmsr */
+
+	GUEST_ASSERT(!vmresume());
+	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
+	GUEST_SYNC(11);
+
+	/* Try enlightened vmptrld with an incorrect GPA */
+	evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs);
+	GUEST_ASSERT(vmlaunch());
+	GUEST_ASSERT(ud_count == 1);
+	GUEST_DONE();
+}
+
+void inject_nmi(struct kvm_vcpu *vcpu)
+{
+	struct kvm_vcpu_events events;
+
+	vcpu_events_get(vcpu, &events);
+
+	events.nmi.pending = 1;
+	events.flags |= KVM_VCPUEVENT_VALID_NMI_PENDING;
+
+	vcpu_events_set(vcpu, &events);
+}
+
+static struct kvm_vcpu *save_restore_vm(struct kvm_vm *vm,
+					struct kvm_vcpu *vcpu)
+{
+	struct kvm_regs regs1, regs2;
+	struct kvm_x86_state *state;
+
+	state = vcpu_save_state(vcpu);
+	memset(&regs1, 0, sizeof(regs1));
+	vcpu_regs_get(vcpu, &regs1);
+
+	kvm_vm_release(vm);
+
+	/* Restore state in a new VM.  */
+	vcpu = vm_recreate_with_one_vcpu(vm);
+	vcpu_set_hv_cpuid(vcpu);
+	vcpu_enable_evmcs(vcpu);
+	vcpu_load_state(vcpu, state);
+	kvm_x86_state_cleanup(state);
+
+	memset(&regs2, 0, sizeof(regs2));
+	vcpu_regs_get(vcpu, &regs2);
+	TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
+		    "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
+		    (ulong) regs2.rdi, (ulong) regs2.rsi);
+	return vcpu;
+}
+
+int main(int argc, char *argv[])
+{
+	vm_vaddr_t vmx_pages_gva = 0;
+
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+	struct kvm_run *run;
+	struct ucall uc;
+	int stage;
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
+	TEST_REQUIRE(kvm_has_cap(KVM_CAP_NESTED_STATE));
+	TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS));
+
+	vcpu_set_hv_cpuid(vcpu);
+	vcpu_enable_evmcs(vcpu);
+
+	vcpu_alloc_vmx(vm, &vmx_pages_gva);
+	vcpu_args_set(vcpu, 1, vmx_pages_gva);
+
+	vm_init_descriptor_tables(vm);
+	vcpu_init_descriptor_tables(vcpu);
+	vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
+	vm_install_exception_handler(vm, NMI_VECTOR, guest_nmi_handler);
+
+	pr_info("Running L1 which uses EVMCS to run L2\n");
+
+	for (stage = 1;; stage++) {
+		run = vcpu->run;
+
+		vcpu_run(vcpu);
+		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
+			    "Stage %d: unexpected exit reason: %u (%s),\n",
+			    stage, run->exit_reason,
+			    exit_reason_str(run->exit_reason));
+
+		switch (get_ucall(vcpu, &uc)) {
+		case UCALL_ABORT:
+			REPORT_GUEST_ASSERT(uc);
+			/* NOT REACHED */
+		case UCALL_SYNC:
+			break;
+		case UCALL_DONE:
+			goto done;
+		default:
+			TEST_FAIL("Unknown ucall %lu", uc.cmd);
+		}
+
+		/* UCALL_SYNC is handled here.  */
+		TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
+			    uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
+			    stage, (ulong)uc.args[1]);
+
+		vcpu = save_restore_vm(vm, vcpu);
+
+		/* Force immediate L2->L1 exit before resuming */
+		if (stage == 8) {
+			pr_info("Injecting NMI into L1 before L2 had a chance to run after restore\n");
+			inject_nmi(vcpu);
+		}
+
+		/*
+		 * Do KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE for a freshly
+		 * restored VM (before the first KVM_RUN) to check that
+		 * KVM_STATE_NESTED_EVMCS is not lost.
+		 */
+		if (stage == 9) {
+			pr_info("Trying extra KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE cycle\n");
+			vcpu = save_restore_vm(vm, vcpu);
+		}
+	}
+
+done:
+	kvm_vm_free(vm);
+}