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HV: vm_load: load protected mode code only for bzImage

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When LaaG boots with bzImage module file, only protected mode code need
to be loaded to guest space since the VM will boot from protected mode
directly. Futhermore, per Linux boot protocol the protected mode code
better to be aligned with kernel_alignment field in zeropage, otherwise
kernel will take time to do "rep movs" to the aligned address.

In previous code, the bzImage is loaded to the address where aligned with
kernel_alignment, this would make the protected mode code unalign with
kernel_alignment. If the kernel is configured with CONFIG_RELOCATABLE=n,
the guest would not boot. This patch fixed this issue.

Tracked-On: #6323

Signed-off-by: Victor Sun <victor.sun@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
This commit is contained in:
Victor Sun 2021-06-23 13:46:59 +08:00 committed by wenlingz
parent 9caff7360f
commit 2b5bd2e87a
1 changed files with 21 additions and 11 deletions
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32
hypervisor/common/vm_load.c
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@ -294,7 +294,7 @@ static uint64_t create_zero_page(struct acrn_vm *vm, uint64_t load_params_gpa)
}
#endif
/* copy part of the header into the zero page */
hva = (struct zero_page *)gpa2hva(vm, (uint64_t)sw_kernel->kernel_load_addr);
hva = (struct zero_page *)sw_kernel->kernel_src_addr;
(void)memcpy_s(&(zeropage->hdr), sizeof(zeropage->hdr),
&(hva->hdr), sizeof(hva->hdr));
@ -339,17 +339,30 @@ static void load_sw_module(struct acrn_vm *vm, struct sw_module_info *sw_module)
static void prepare_loading_bzimage(struct acrn_vm *vm, struct acrn_vcpu *vcpu, uint64_t load_params_gpa)
{
uint32_t i;
uint32_t kernel_entry_offset;
uint32_t prot_code_offset, prot_code_size, kernel_entry_offset;
uint8_t setup_sectors;
const struct acrn_vm_config *vm_config = get_vm_config(vm->vm_id);
struct zero_page *zeropage;
struct sw_kernel_info *sw_kernel = &(vm->sw.kernel_info);
struct sw_module_info *bootargs_info = &(vm->sw.bootargs_info);
struct sw_module_info *ramdisk_info = &(vm->sw.ramdisk_info);
struct sw_module_info *acpi_info = &(vm->sw.acpi_info);
struct zero_page *zeropage = (struct zero_page *)sw_kernel->kernel_src_addr;
/* Copy the guest kernel image to its run-time location */
(void)copy_to_gpa(vm, sw_kernel->kernel_src_addr,
(uint64_t)sw_kernel->kernel_load_addr, sw_kernel->kernel_size);
/* The bzImage file consists of three parts:
* boot_params(i.e. zero page) + real mode setup code + compressed protected mode code
* The compressed proteced mode code start at offset (setup_sectors + 1U) * 512U of bzImage.
* Only protected mode code need to be loaded.
*/
stac();
setup_sectors = (zeropage->hdr.setup_sects == 0U) ? 4U : zeropage->hdr.setup_sects;
clac();
prot_code_offset = (uint32_t)(setup_sectors + 1U) * 512U;
prot_code_size = (sw_kernel->kernel_size > prot_code_offset) ?
(sw_kernel->kernel_size - prot_code_offset) : 0U;
/* Copy the protected mode part kernel code to its run-time location */
(void)copy_to_gpa(vm, (sw_kernel->kernel_src_addr + prot_code_offset),
(uint64_t)sw_kernel->kernel_load_addr, prot_code_size);
if (vm->sw.ramdisk_info.size > 0U) {
/* Use customer specified ramdisk load addr if it is configured in VM configuration,
@ -379,11 +392,8 @@ static void prepare_loading_bzimage(struct acrn_vm *vm, struct acrn_vcpu *vcpu,
/* Copy Guest OS ACPI to its load location */
load_sw_module(vm, acpi_info);
/* calculate the kernel entry point */
zeropage = (struct zero_page *)sw_kernel->kernel_src_addr;
stac();
kernel_entry_offset = (uint32_t)(zeropage->hdr.setup_sects + 1U) * 512U;
clac();
/* 32bit kernel entry is at where protected mode code loaded */
kernel_entry_offset = 0U;
if (vcpu->arch.cpu_mode == CPU_MODE_64BIT) {
/* 64bit entry is the 512bytes after the start */
kernel_entry_offset += 512U;