linux/tools/testing/selftests/kvm/lib/guest_modes.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020, Red Hat, Inc.
 */
#include "guest_modes.h"

#if defined(__aarch64__) || defined(__riscv)
#include "processor.h"
enum vm_guest_mode vm_mode_default;
#endif

struct guest_mode guest_modes[NUM_VM_MODES];

void guest_modes_append_default(void)
{
#if !defined(__aarch64__) && !defined(__riscv)
	guest_mode_append(VM_MODE_DEFAULT, true);
#endif

#ifdef __aarch64__
	{
		unsigned int limit = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
		u32 ipa4k, ipa16k, ipa64k;
		int i;

		aarch64_get_supported_page_sizes(limit, &ipa4k, &ipa16k, &ipa64k);

		guest_mode_append(VM_MODE_P52V48_4K, ipa4k >= 52);
		guest_mode_append(VM_MODE_P52V48_16K, ipa16k >= 52);
		guest_mode_append(VM_MODE_P52V48_64K, ipa64k >= 52);

		guest_mode_append(VM_MODE_P48V48_4K, ipa4k >= 48);
		guest_mode_append(VM_MODE_P48V48_16K, ipa16k >= 48);
		guest_mode_append(VM_MODE_P48V48_64K, ipa64k >= 48);

		guest_mode_append(VM_MODE_P40V48_4K, ipa4k >= 40);
		guest_mode_append(VM_MODE_P40V48_16K, ipa16k >= 40);
		guest_mode_append(VM_MODE_P40V48_64K, ipa64k >= 40);

		guest_mode_append(VM_MODE_P36V48_4K, ipa4k >= 36);
		guest_mode_append(VM_MODE_P36V48_16K, ipa16k >= 36);
		guest_mode_append(VM_MODE_P36V48_64K, ipa64k >= 36);
		guest_mode_append(VM_MODE_P36V47_16K, ipa16k >= 36);

		vm_mode_default = ipa4k >= 40 ? VM_MODE_P40V48_4K : NUM_VM_MODES;

		/*
		 * Pick the first supported IPA size if the default
		 * isn't available.
		 */
		for (i = 0; vm_mode_default == NUM_VM_MODES && i < NUM_VM_MODES; i++) {
			if (guest_modes[i].supported && guest_modes[i].enabled)
				vm_mode_default = i;
		}

		TEST_ASSERT(vm_mode_default != NUM_VM_MODES,
			    "No supported mode!");
	}
#endif
#ifdef __s390x__
	{
		int kvm_fd, vm_fd;
		struct kvm_s390_vm_cpu_processor info;

		kvm_fd = open_kvm_dev_path_or_exit();
		vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, NULL);
		kvm_device_attr_get(vm_fd, KVM_S390_VM_CPU_MODEL,
				    KVM_S390_VM_CPU_PROCESSOR, &info);
		close(vm_fd);
		close(kvm_fd);
		/* Starting with z13 we have 47bits of physical address */
		if (info.ibc >= 0x30)
			guest_mode_append(VM_MODE_P47V64_4K, true);
	}
#endif
#ifdef __riscv
	{
		unsigned int sz = kvm_check_cap(KVM_CAP_VM_GPA_BITS);
		unsigned long satp_mode = riscv64_get_satp_mode() << SATP_MODE_SHIFT;
		int i;

		switch (sz) {
		case 59:
			guest_mode_append(VM_MODE_P56V57_4K, satp_mode >= SATP_MODE_57);
			guest_mode_append(VM_MODE_P56V48_4K, satp_mode >= SATP_MODE_48);
			guest_mode_append(VM_MODE_P56V39_4K, satp_mode >= SATP_MODE_39);
			break;
		case 50:
			guest_mode_append(VM_MODE_P50V57_4K, satp_mode >= SATP_MODE_57);
			guest_mode_append(VM_MODE_P50V48_4K, satp_mode >= SATP_MODE_48);
			guest_mode_append(VM_MODE_P50V39_4K, satp_mode >= SATP_MODE_39);
			break;
		case 41:
			guest_mode_append(VM_MODE_P41V57_4K, satp_mode >= SATP_MODE_57);
			guest_mode_append(VM_MODE_P41V48_4K, satp_mode >= SATP_MODE_48);
			guest_mode_append(VM_MODE_P41V39_4K, satp_mode >= SATP_MODE_39);
			break;
		default:
			break;
		}

		/* set the first supported mode as default */
		vm_mode_default = NUM_VM_MODES;
		for (i = 0; vm_mode_default == NUM_VM_MODES && i < NUM_VM_MODES; i++) {
			if (guest_modes[i].supported && guest_modes[i].enabled)
				vm_mode_default = i;
		}
		TEST_ASSERT(vm_mode_default != NUM_VM_MODES, "No supported mode!");
	}
#endif
}

void for_each_guest_mode(void (*func)(enum vm_guest_mode, void *), void *arg)
{
	int i;

	for (i = 0; i < NUM_VM_MODES; ++i) {
		if (!guest_modes[i].enabled)
			continue;
		TEST_ASSERT(guest_modes[i].supported,
			    "Guest mode ID %d (%s) not supported.",
			    i, vm_guest_mode_string(i));
		func(i, arg);
	}
}

void guest_modes_help(void)
{
	int i;

	printf(" -m: specify the guest mode ID to test\n"
	       "     (default: test all supported modes)\n"
	       "     This option may be used multiple times.\n"
	       "     Guest mode IDs:\n");
	for (i = 0; i < NUM_VM_MODES; ++i) {
		printf("         %d:    %s%s\n", i, vm_guest_mode_string(i),
		       guest_modes[i].supported ? " (supported)" : "");
	}
}

void guest_modes_cmdline(const char *arg)
{
	static bool mode_selected;
	unsigned int mode;
	int i;

	if (!mode_selected) {
		for (i = 0; i < NUM_VM_MODES; ++i)
			guest_modes[i].enabled = false;
		mode_selected = true;
	}

	mode = atoi_non_negative("Guest mode ID", arg);
	TEST_ASSERT(mode < NUM_VM_MODES, "Guest mode ID %d too big", mode);
	guest_modes[mode].enabled = true;
}