acrn-hypervisor/hypervisor/boot/guest/vboot_info.c

/*
 * Copyright (C) 2019 Intel Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <types.h>
#include <rtl.h>
#include <errno.h>
#include <per_cpu.h>
#include <irq.h>
#include <boot_context.h>
#include <sprintf.h>
#include <multiboot.h>
#include <pgtable.h>
#include <zeropage.h>
#include <seed.h>
#include <mmu.h>
#include <vm.h>
#include <logmsg.h>
#include <deprivilege_boot.h>

#define ACRN_DBG_BOOT	6U

#define MAX_BOOT_PARAMS_LEN 64U

/* There are two sources for sos_vm kernel cmdline:
 * - cmdline from direct boot mbi->cmdline
 * - cmdline from acrn stitching tool. mod[0].mm_string
 * We need to merge them together
 */
static char kernel_cmdline[MAX_BOOTARGS_SIZE + 1U];

/* now modules support: FIRMWARE & RAMDISK & SeedList */
static void parse_other_modules(struct acrn_vm *vm, const struct multiboot_module *mods, uint32_t mods_count)
{
	uint32_t i;

	for (i = 0U; i < mods_count; i++) {
		uint32_t type_len;
		const char *start = (char *)hpa2hva((uint64_t)mods[i].mm_string);
		const char *end;
		void *mod_addr = hpa2hva((uint64_t)mods[i].mm_mod_start);
		uint32_t mod_size = mods[i].mm_mod_end - mods[i].mm_mod_start;

		dev_dbg(ACRN_DBG_BOOT, "other mod-%d start=0x%x, end=0x%x",
			i, mods[i].mm_mod_start, mods[i].mm_mod_end);
		dev_dbg(ACRN_DBG_BOOT, "cmd addr=0x%x, str=%s",
			mods[i].mm_string, start);

		while (*start == ' ') {
			start++;
		}

		end = start;
		while (((*end) != ' ') && ((*end) != '\0')) {
			end++;
		}

		type_len = end - start;
		if (strncmp("FIRMWARE", start, type_len) == 0) {
			char  dyn_bootargs[100] = {'\0'};
			void *load_addr = gpa2hva(vm, (uint64_t)vm->sw.bootargs_info.load_addr);
			uint32_t args_size = vm->sw.bootargs_info.size;
			static int32_t copy_once = 1;

			start = end + 1; /*it is fw name for boot args */
			snprintf(dyn_bootargs, 100U, " %s=0x%x@0x%x ", start, mod_size, mod_addr);
			dev_dbg(ACRN_DBG_BOOT, "fw-%d: %s", i, dyn_bootargs);

			/*copy boot args to load addr, set src=load addr*/
			if (copy_once != 0) {
				copy_once = 0;
				(void)strncpy_s(load_addr, MAX_BOOTARGS_SIZE + 1U,
					(const char *)vm->sw.bootargs_info.src_addr,
					vm->sw.bootargs_info.size);
				vm->sw.bootargs_info.src_addr = load_addr;
			}

			(void)strncpy_s(load_addr + args_size, 100U, dyn_bootargs, 100U);
			vm->sw.bootargs_info.size = strnlen_s(load_addr, MAX_BOOTARGS_SIZE);

		} else if (strncmp("RAMDISK", start, type_len) == 0) {
			vm->sw.ramdisk_info.src_addr = mod_addr;
			vm->sw.ramdisk_info.load_addr = vm->sw.kernel_info.kernel_load_addr +
				vm->sw.kernel_info.kernel_size;
			vm->sw.ramdisk_info.load_addr =
				(void *)round_page_up((uint64_t)vm->sw.ramdisk_info.load_addr);
			vm->sw.ramdisk_info.size = mod_size;
		} else {
			pr_warn("not support mod, cmd: %s", start);
		}
	}
}

/**
 * @pre vm != NULL && cmdline != NULL && cmdstr != NULL
 */
static void merge_cmdline(const struct acrn_vm *vm, const char *cmdline, const char *cmdstr)
{
	char *cmd_dst = kernel_cmdline;
	uint32_t cmdline_len, cmdstr_len;
	uint32_t dst_avail; /* available room for cmd_dst[] */
	uint32_t dst_len; /* the actual number of characters that are copied */

	/*
	 * Append seed argument for SOS
	 * seed_arg string ends with a white space and '\0', so no aditional delimiter is needed
	 */
	append_seed_arg(cmd_dst, is_sos_vm(vm));
	dst_len = strnlen_s(cmd_dst, MAX_BOOTARGS_SIZE);
	dst_avail = MAX_BOOTARGS_SIZE + 1U - dst_len;
	cmd_dst += dst_len;

	cmdline_len = strnlen_s(cmdline, MAX_BOOTARGS_SIZE);
	cmdstr_len = strnlen_s(cmdstr, MAX_BOOTARGS_SIZE);

	/* reserve one character for the delimiter between 2 strings (one white space) */
	if ((cmdline_len + cmdstr_len + 1U) >= dst_avail) {
		panic("Multiboot bootarg string too long");
	} else {
		/* copy mbi->mi_cmdline */
		(void)strncpy_s(cmd_dst, dst_avail, cmdline, cmdline_len);
		dst_len = strnlen_s(cmd_dst, dst_avail);
		dst_avail -= dst_len;
		cmd_dst += dst_len;

		/* overwrite '\0' with a white space */
		(void)strncpy_s(cmd_dst, dst_avail, " ", 1U);
		dst_avail -= 1U;
		cmd_dst += 1U;

		/* copy vm_config->os_config.bootargs */
		(void)strncpy_s(cmd_dst, dst_avail, cmdstr, cmdstr_len);
	}
}

static void *get_kernel_load_addr(struct acrn_vm *vm)
{
	void *load_addr = NULL;
	struct vm_sw_info *sw_info = &vm->sw;
	struct zero_page *zeropage;

	switch (sw_info->kernel_type) {
	case KERNEL_BZIMAGE:
		/* According to the explaination for pref_address
		 * in Documentation/x86/boot.txt, a relocating
		 * bootloader should attempt to load kernel at pref_address
		 * if possible. A non-relocatable kernel will unconditionally
		 * move itself and to run at this address, so no need to copy
		 * kernel to perf_address by bootloader, if kernel is
		 * non-relocatable.
		 */
		zeropage = (struct zero_page *)sw_info->kernel_info.kernel_src_addr;
		if (zeropage->hdr.relocatable_kernel != 0U) {
			zeropage = (struct zero_page *)zeropage->hdr.pref_addr;
		}
		load_addr = (void *)zeropage;
		break;
	default:
		pr_err("Unsupported Kernel type.");
		break;
	}
	if (load_addr == NULL) {
		pr_err("Could not get kernel load addr of VM %d .", vm->vm_id);
	}
	return load_addr;
}

static int32_t init_general_vm_boot_info(struct acrn_vm *vm)
{
	struct multiboot_module *mods = NULL;
	struct multiboot_info *mbi = NULL;
	struct acrn_vm_config *vm_config = get_vm_config(vm->vm_id);
	int32_t ret = -EINVAL;

	if (boot_regs[0] != MULTIBOOT_INFO_MAGIC) {
		panic("no multiboot info found");
	} else {
		mbi = (struct multiboot_info *)hpa2hva((uint64_t)boot_regs[1]);

		if (mbi != NULL) {
			stac();
			dev_dbg(ACRN_DBG_BOOT, "Multiboot detected, flag=0x%x", mbi->mi_flags);
			if ((mbi->mi_flags & MULTIBOOT_INFO_HAS_MODS) == 0U) {
				panic("no sos kernel info found");
				clac();
			} else {

				dev_dbg(ACRN_DBG_BOOT, "mod counts=%d\n", mbi->mi_mods_count);

				/* mod[0] is for kernel, other mod for ramdisk/firmware info*/
				mods = (struct multiboot_module *)hpa2hva((uint64_t)mbi->mi_mods_addr);

				dev_dbg(ACRN_DBG_BOOT, "mod0 start=0x%x, end=0x%x",
					mods[0].mm_mod_start, mods[0].mm_mod_end);

				vm->sw.kernel_type = vm_config->os_config.kernel_type;
				vm->sw.kernel_info.kernel_src_addr = hpa2hva((uint64_t)mods[0].mm_mod_start);
				vm->sw.kernel_info.kernel_size = mods[0].mm_mod_end - mods[0].mm_mod_start;
				vm->sw.kernel_info.kernel_load_addr = get_kernel_load_addr(vm);

				if (vm_config->load_order == PRE_LAUNCHED_VM) {
					vm->sw.bootargs_info.src_addr = (void *)vm_config->os_config.bootargs;
					vm->sw.bootargs_info.size =
						strnlen_s(vm_config->os_config.bootargs, MAX_BOOTARGS_SIZE);
				} else {
					if ((mbi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE) != 0U) {
						/*
						 * If there is cmdline from mbi->mi_cmdline, merge it with
						 * vm_config->os_config.bootargs
						 */
						merge_cmdline(vm, hpa2hva((uint64_t)mbi->mi_cmdline),
								vm_config->os_config.bootargs);

						vm->sw.bootargs_info.src_addr = kernel_cmdline;
						vm->sw.bootargs_info.size =
							strnlen_s(kernel_cmdline, MAX_BOOTARGS_SIZE);
					} else {
						vm->sw.bootargs_info.src_addr = vm_config->os_config.bootargs;
						vm->sw.bootargs_info.size =
							strnlen_s(vm_config->os_config.bootargs, MAX_BOOTARGS_SIZE);
					}
				}

				/* Kernel bootarg and zero page are right before the kernel image */
				vm->sw.bootargs_info.load_addr =
					vm->sw.kernel_info.kernel_load_addr - (MEM_1K * 8U);

				if (mbi->mi_mods_count > 1U) {
					/*parse other modules, like firmware /ramdisk */
					parse_other_modules(vm, mods + 1, mbi->mi_mods_count - 1);
				}
				clac();
				if (vm->sw.kernel_info.kernel_load_addr != NULL) {
					ret = 0;
				}
			}
		}
	}
	return ret;
}

static void depri_boot_spurious_handler(uint32_t vector)
{
	if (get_pcpu_id() == BOOT_CPU_ID) {
		struct acrn_vcpu *vcpu = per_cpu(vcpu, BOOT_CPU_ID);

		if (vcpu != NULL) {
			vlapic_set_intr(vcpu, vector, LAPIC_TRIG_EDGE);
		} else {
			pr_err("%s vcpu or vlapic is not ready, interrupt lost\n", __func__);
		}
	}
}

static int32_t depri_boot_sw_loader(struct acrn_vm *vm)
{
	int32_t ret = 0;
	/* get primary vcpu */
	struct acrn_vcpu *vcpu = vcpu_from_vid(vm, BOOT_CPU_ID);
	struct acrn_vcpu_regs *vcpu_regs = &boot_context;
	const struct depri_boot_context *depri_boot_ctx = get_depri_boot_ctx();
	const struct lapic_regs *depri_boot_lapic_regs = get_depri_boot_lapic_regs();

	pr_dbg("Loading guest to run-time location");

	vlapic_restore(vcpu_vlapic(vcpu), depri_boot_lapic_regs);

	/* For UEFI platform, the bsp init regs come from two places:
	 * 1. saved in depri_boot: gpregs, rip
	 * 2. saved when HV started: other registers
	 * We copy the info saved in depri_boot to boot_context and
	 * init bsp with boot_context.
	 */
	memcpy_s(&(vcpu_regs->gprs), sizeof(struct acrn_gp_regs),
		&(depri_boot_ctx->vcpu_regs.gprs), sizeof(struct acrn_gp_regs));

	vcpu_regs->rip = depri_boot_ctx->vcpu_regs.rip;
	set_vcpu_regs(vcpu, vcpu_regs);

	/* defer irq enabling till vlapic is ready */
	spurious_handler = depri_boot_spurious_handler;
	CPU_IRQ_ENABLE();

	return ret;
}

/**
 * @param[inout] vm pointer to a vm descriptor
 *
 * @retval 0 on success
 * @retval -EINVAL on invalid parameters
 *
 * @pre vm != NULL
 */
int32_t init_vm_boot_info(struct acrn_vm *vm)
{
	int32_t ret = 0;

	if (is_sos_vm(vm) && (get_sos_boot_mode() == DEPRI_BOOT_MODE)) {
		vm_sw_loader = depri_boot_sw_loader;
	} else {
		vm_sw_loader = direct_boot_sw_loader;
		ret = init_general_vm_boot_info(vm);
	}

	return ret;
}