228 lines
6.4 KiB
C
228 lines
6.4 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <hypervisor.h>
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#include <zeropage.h>
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static uint32_t create_e820_table(struct e820_entry *_e820)
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{
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uint32_t i;
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ASSERT(e820_entries > 0,
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"e820 should be inited");
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for (i = 0; i < e820_entries; i++) {
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_e820[i].baseaddr = e820[i].baseaddr;
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_e820[i].length = e820[i].length;
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_e820[i].type = e820[i].type;
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}
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return e820_entries;
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}
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static uint64_t create_zero_page(struct vm *vm)
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{
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struct zero_page *zeropage;
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struct sw_linux *sw_linux = &(vm->sw.linux_info);
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struct zero_page *hva;
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uint64_t gpa;
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/* Set zeropage in Linux Guest RAM region just past boot args */
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hva = GPA2HVA(vm, (uint64_t)sw_linux->bootargs_load_addr);
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zeropage = (struct zero_page *)((char *)hva + MEM_4K);
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/* clear the zeropage */
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memset(zeropage, 0, MEM_2K);
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/* copy part of the header into the zero page */
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hva = GPA2HVA(vm, (uint64_t)vm->sw.kernel_info.kernel_load_addr);
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memcpy_s(&(zeropage->hdr), sizeof(zeropage->hdr),
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&(hva->hdr), sizeof(hva->hdr));
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/* See if kernel has a RAM disk */
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if (sw_linux->ramdisk_src_addr) {
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/* Copy ramdisk load_addr and size in zeropage header structure
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*/
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zeropage->hdr.ramdisk_addr =
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(uint32_t)(uint64_t)sw_linux->ramdisk_load_addr;
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zeropage->hdr.ramdisk_size = (uint32_t)sw_linux->ramdisk_size;
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}
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/* Copy bootargs load_addr in zeropage header structure */
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zeropage->hdr.bootargs_addr =
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(uint32_t)(uint64_t)sw_linux->bootargs_load_addr;
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/* set constant arguments in zero page */
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zeropage->hdr.loader_type = 0xff;
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zeropage->hdr.load_flags |= (1 << 5); /* quiet */
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/* Create/add e820 table entries in zeropage */
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zeropage->e820_nentries = create_e820_table(zeropage->e820);
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/* Get the host physical address of the zeropage */
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gpa = hpa2gpa(vm, HVA2HPA((uint64_t)zeropage));
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/* Return Physical Base Address of zeropage */
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return gpa;
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}
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int load_guest(struct vm *vm, struct vcpu *vcpu)
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{
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int ret = 0;
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void *hva;
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struct run_context *cur_context =
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&vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context];
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uint64_t lowmem_gpa_top;
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hva = GPA2HVA(vm, GUEST_CFG_OFFSET);
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lowmem_gpa_top = *(uint64_t *)hva;
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/* hardcode vcpu entry addr(kernel entry) & rsi (zeropage)*/
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memset(cur_context->guest_cpu_regs.longs,
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0, sizeof(uint64_t)*NUM_GPRS);
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hva = GPA2HVA(vm, lowmem_gpa_top -
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MEM_4K - MEM_2K);
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vcpu->entry_addr = (void *)(*((uint64_t *)hva));
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cur_context->guest_cpu_regs.regs.rsi =
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lowmem_gpa_top - MEM_4K;
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pr_info("%s, Set config according to predefined offset:",
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__func__);
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pr_info("VCPU%d Entry: 0x%llx, RSI: 0x%016llx, cr3: 0x%016llx",
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vcpu->vcpu_id, vcpu->entry_addr,
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cur_context->guest_cpu_regs.regs.rsi,
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vm->arch_vm.guest_init_pml4);
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return ret;
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}
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int general_sw_loader(struct vm *vm, struct vcpu *vcpu)
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{
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int ret = 0;
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void *hva;
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struct run_context *cur_context =
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&vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context];
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char dyn_bootargs[100] = {0};
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uint32_t kernel_entry_offset;
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struct zero_page *zeropage;
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ASSERT(vm != NULL, "Incorrect argument");
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pr_dbg("Loading guest to run-time location");
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/* FIXME: set config according to predefined offset */
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if (!is_vm0(vm))
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return load_guest(vm, vcpu);
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/* calculate the kernel entry point */
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zeropage = (struct zero_page *)
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vm->sw.kernel_info.kernel_src_addr;
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kernel_entry_offset = (zeropage->hdr.setup_sects + 1) * 512;
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if (vcpu->arch_vcpu.cpu_mode == CPU_MODE_64BIT)
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/* 64bit entry is the 512bytes after the start */
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kernel_entry_offset += 512;
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vm->sw.kernel_info.kernel_entry_addr =
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(void *)((unsigned long)vm->sw.kernel_info.kernel_load_addr
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+ kernel_entry_offset);
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if (is_vcpu_bsp(vcpu)) {
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/* Set VCPU entry point to kernel entry */
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vcpu->entry_addr = vm->sw.kernel_info.kernel_entry_addr;
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pr_info("%s, VM *d VCPU %d Entry: 0x%016llx ",
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__func__, vm->attr.id, vcpu->vcpu_id, vcpu->entry_addr);
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}
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/* Calculate the host-physical address where the guest will be loaded */
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hva = GPA2HVA(vm, (uint64_t)vm->sw.kernel_info.kernel_load_addr);
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/* Copy the guest kernel image to its run-time location */
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memcpy_s((void *)hva, vm->sw.kernel_info.kernel_size,
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vm->sw.kernel_info.kernel_src_addr,
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vm->sw.kernel_info.kernel_size);
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/* See if guest is a Linux guest */
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if (vm->sw.kernel_type == VM_LINUX_GUEST) {
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/* Documentation states: ebx=0, edi=0, ebp=0, esi=ptr to
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* zeropage
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*/
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memset(cur_context->guest_cpu_regs.longs,
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0, sizeof(uint64_t) * NUM_GPRS);
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/* Get host-physical address for guest bootargs */
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hva = GPA2HVA(vm,
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(uint64_t)vm->sw.linux_info.bootargs_load_addr);
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/* Copy Guest OS bootargs to its load location */
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strcpy_s((char *)hva, MEM_2K,
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vm->sw.linux_info.bootargs_src_addr);
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#ifdef CONFIG_CMA
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/* add "cma=XXXXM@0xXXXXXXXX" to cmdline*/
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if (is_vm0(vm) && (e820_mem.max_ram_blk_size > 0)) {
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snprintf(dyn_bootargs, 100, " cma=%dM@0x%llx",
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(e820_mem.max_ram_blk_size >> 20),
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e820_mem.max_ram_blk_base);
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strcpy_s((char *)hva
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+vm->sw.linux_info.bootargs_size,
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100, dyn_bootargs);
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}
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#else
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/* add "hugepagesz=1G hugepages=x" to cmdline for 1G hugepage
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* reserving. Current strategy is "total_mem_size in Giga -
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* remained 1G pages" for reserving.
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*/
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if (is_vm0(vm) && check_mmu_1gb_support(PTT_HOST)) {
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int reserving_1g_pages;
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#ifdef CONFIG_REMAIN_1G_PAGES
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reserving_1g_pages = (e820_mem.total_mem_size >> 30) -
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CONFIG_REMAIN_1G_PAGES;
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#else
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reserving_1g_pages = (e820_mem.total_mem_size >> 30) -
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3;
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#endif
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if (reserving_1g_pages > 0) {
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snprintf(dyn_bootargs, 100,
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" hugepagesz=1G hugepages=%d",
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reserving_1g_pages);
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strcpy_s((char *)hva
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+vm->sw.linux_info.bootargs_size,
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100, dyn_bootargs);
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}
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}
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#endif
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/* Check if a RAM disk is present with Linux guest */
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if (vm->sw.linux_info.ramdisk_src_addr) {
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/* Get host-physical address for guest RAM disk */
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hva = GPA2HVA(vm,
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(uint64_t)vm->sw.linux_info.ramdisk_load_addr);
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/* Copy RAM disk to its load location */
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memcpy_s((void *)hva, vm->sw.linux_info.ramdisk_size,
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vm->sw.linux_info.ramdisk_src_addr,
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vm->sw.linux_info.ramdisk_size);
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}
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/* Create Zeropage and copy Physical Base Address of Zeropage
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* in RSI
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*/
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cur_context->guest_cpu_regs.regs.rsi = create_zero_page(vm);
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pr_info("%s, RSI pointing to zero page for VM %d at GPA %X",
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__func__, vm->attr.id,
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cur_context->guest_cpu_regs.regs.rsi);
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} else {
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pr_err("%s, Loading VM SW failed", __func__);
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ret = -EINVAL;
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}
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return ret;
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}
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