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hv: add memory allocation functions for trampoline code relocation

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emalloc_for_low_mem() is used if CONFIG_EFI_STUB is defined.
e820_alloc_low_memory() is used for other cases

In either case, the allocated memory will be marked with E820_TYPE_RESERVED

Signed-off-by: Zheng, Gen <gen.zheng@intel.com>
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Acked-by: Xu, Anthony <anthony.xu@intel.com>
This commit is contained in:
Zide Chen
2018-05-02 23:21:07 -07:00
committed by lijinxia
parent 1f074a2f2a
commit 77580edff0
4 changed files with 114 additions and 0 deletions
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53
hypervisor/arch/x86/guest/guest.c
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@@ -603,6 +603,59 @@ int prepare_vm0_memmap_and_e820(struct vm *vm)
return 0;
}
uint64_t e820_alloc_low_memory(uint32_t size)
{
uint32_t i;
struct e820_entry *entry, *new_entry;
/* We want memory in page boundary and integral multiple of pages */
size = ROUND_PAGE_UP(size);
for (i = 0; i < e820_entries; i++) {
entry = &e820[i];
uint64_t start, end, length;
start = ROUND_PAGE_UP(entry->baseaddr);
end = ROUND_PAGE_DOWN(entry->baseaddr + entry->length);
length = end - start;
length = (end > start) ? (end - start) : 0;
/* Search for available low memory */
if ((entry->type != E820_TYPE_RAM)
|| (length < size)
|| (start + size > MEM_1M)) {
continue;
}
/* found exact size of e820 entry */
if (length == size) {
entry->type = E820_TYPE_RESERVED;
e820_mem.total_mem_size -= size;
return start;
}
/*
* found entry with available memory larger than requested
* alocate memory from the end of this entry at page boundary
*/
new_entry = &e820[e820_entries];
new_entry->type = E820_TYPE_RESERVED;
new_entry->baseaddr = end - size;
new_entry->length = entry->baseaddr +
entry->length - new_entry->baseaddr;
/* Shrink the existing entry and total available memory */
entry->length -= new_entry->length;
e820_mem.total_mem_size -= new_entry->length;
e820_entries++;
return new_entry->baseaddr;
}
pr_fatal("Can't allocate memory under 1M from E820\n");
return ACRN_INVALID_HPA;
}
#ifdef CONFIG_START_VM0_BSP_64BIT
/*******************************************************************
* GUEST initial page table