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HV: prepare adaptable guest EFI mmap buffer 

Previously we prepared 32KB buffer to store guest VM boot parameters, in which
there is at most 17KB buffer for guest EFI memory map to accomodate ~400 EFI
memory descriptors. But this is uncertain to ensure working on all boards, now
change the algorithm that make the EFI mmap buffer adaptable with configured
MAX_EFI_MMAP_ENTRIES macro.

Tracked-On: #6442

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@Intel.com>
This commit is contained in:
Victor Sun 2021-09-28 10:24:56 +08:00 committed by wenlingz
parent 914341c9aa
commit c5107123f6
1 changed files with 6 additions and 6 deletions
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12
hypervisor/boot/guest/bzimage_loader.c
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@ -18,19 +18,19 @@
#define DBG_LEVEL_VM_BZIMAGE 6U
/* Define a 32KB memory block to store LaaG VM load params in guest address space
/* Define a memory block to store LaaG VM load params in guest address space
* The params including:
* Init GDT entries : 1KB (must be 8byte aligned)
* Linux Zeropage : 4KB
* Boot cmdline : 2KB
* EFI memory map : 12KB
* EFI memory map : MAX_EFI_MMAP_ENTRIES * sizeof(struct efi_memory_desc)
* Reserved region for trampoline code : 8KB
* Each param should keep 8byte aligned and the total region size should be less than 32KB
* so that it could be put below MEM_1M.
* Each param should keep 8byte aligned and the total region should be able to put below MEM_1M.
* Please note in Linux VM, the last 8KB space below MEM_1M is for trampoline code. The block
* should be able to accommodate it and so that avoid the trampoline corruption.
* should be able to accommodate it so that avoid the trampoline corruption. So the params size is:
* (MEM_1K + MEM_4K + MEM_2K + 40B * MAX_EFI_MMAP_ENTRIES + MEM_8K)
*/
#define BZIMG_LOAD_PARAMS_SIZE (MEM_4K * 8)
#define BZIMG_LOAD_PARAMS_SIZE (MEM_1K * 15U + MAX_EFI_MMAP_ENTRIES * sizeof(struct efi_memory_desc))
#define BZIMG_INITGDT_GPA(load_params_gpa) ((load_params_gpa) + 0UL)
#define BZIMG_ZEROPAGE_GPA(load_params_gpa) ((load_params_gpa) + MEM_1K)
#define BZIMG_CMDLINE_GPA(load_params_gpa) ((load_params_gpa) + MEM_1K + MEM_4K)