selftests: kvm: add selftest for releasing VM file descriptor while in L2 (65ab26e3) · Commits · e / devices / android_kernel_fairphone_FP5

tools/testing/selftests/kvm/.gitignore

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		@@ -3,6 +3,7 @@
		/x86_64/platform_info_test
		/x86_64/set_sregs_test
		/x86_64/sync_regs_test
		/x86_64/vmx_close_while_nested_test
		/x86_64/vmx_tsc_adjust_test
		/x86_64/state_test
		/dirty_log_test

tools/testing/selftests/kvm/Makefile

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		@@ -16,6 +16,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
		TEST_GEN_PROGS_x86_64 += x86_64/state_test
		TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
		TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
		TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
		TEST_GEN_PROGS_x86_64 += dirty_log_test
		TEST_GEN_PROGS_x86_64 += clear_dirty_log_test

tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c

0 → 100644

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		/*
		* vmx_close_while_nested
		*
		* Copyright (C) 2019, Red Hat, Inc.
		*
		* This work is licensed under the terms of the GNU GPL, version 2.
		*
		* Verify that nothing bad happens if a KVM user exits with open
		* file descriptors while executing a nested guest.
		*/

		#include "test_util.h"
		#include "kvm_util.h"
		#include "processor.h"
		#include "vmx.h"

		#include <string.h>
		#include <sys/ioctl.h>

		#include "kselftest.h"

		#define VCPU_ID 5

		enum {
		PORT_L0_EXIT = 0x2000,
		};

		/* The virtual machine object. */
		static struct kvm_vm *vm;

		static void l2_guest_code(void)
		{
		/* Exit to L0 */
		asm volatile("inb %%dx, %%al"
		: : [port] "d" (PORT_L0_EXIT) : "rax");
		}

		static void l1_guest_code(struct vmx_pages *vmx_pages)
		{
		#define L2_GUEST_STACK_SIZE 64
		unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
		uint32_t control;
		uintptr_t save_cr3;

		GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
		GUEST_ASSERT(load_vmcs(vmx_pages));

		/* Prepare the VMCS for L2 execution. */
		prepare_vmcs(vmx_pages, l2_guest_code,
		&l2_guest_stack[L2_GUEST_STACK_SIZE]);

		GUEST_ASSERT(!vmlaunch());
		GUEST_ASSERT(0);
		}

		int main(int argc, char *argv[])
		{
		struct vmx_pages *vmx_pages;
		vm_vaddr_t vmx_pages_gva;
		struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);

		if (!(entry->ecx & CPUID_VMX)) {
		fprintf(stderr, "nested VMX not enabled, skipping test\n");
		exit(KSFT_SKIP);
		}

		vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
		vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());

		/* Allocate VMX pages and shared descriptors (vmx_pages). */
		vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
		vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);

		for (;;) {
		volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
		struct ucall uc;

		vcpu_run(vm, VCPU_ID);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
		"Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
		run->exit_reason,
		exit_reason_str(run->exit_reason));

		if (run->io.port == PORT_L0_EXIT)
		break;

		switch (get_ucall(vm, VCPU_ID, &uc)) {
		case UCALL_ABORT:
		TEST_ASSERT(false, "%s", (const char *)uc.args[0]);
		/* NOT REACHED */
		default:
		TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
		}
		}
		}