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hv:unmap AP trampoline region from service VM's EPT

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AP trampoline code should be accessile to hypervisor only,
 Unmap this memory region from service VM's EPT mapping
 for security reason..

Tracked-On: #4091
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2019-11-12 16:08:45 +08:00 committed by wenlingz
parent 0b6447ad3d
commit 30a773f7b0
1 changed files with 9 additions and 0 deletions
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9
hypervisor/arch/x86/guest/vm.c
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@ -25,6 +25,7 @@
#include <cat.h>
#include <firmware.h>
#include <board.h>
#include <trampoline.h>
vm_sw_loader_t vm_sw_loader;
@ -304,6 +305,14 @@ static void prepare_sos_vm_memmap(struct acrn_vm *vm)
*/
hv_hpa = hva2hpa((void *)(get_hv_image_base()));
ept_mr_del(vm, pml4_page, hv_hpa, CONFIG_HV_RAM_SIZE);
/* unmap AP trampoline code for security reason.
* 'allocate_pages()' in efi boot mode or
* 'e820_alloc_low_memory()' in direct boot
* mode will ensure the base address of tramploline
* code be page-aligned.
*/
ept_mr_del(vm, pml4_page, get_trampoline_start16_paddr(), CONFIG_LOW_RAM_SIZE);
}
/**