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hv: ept: mask EPT leaf entry bit 52 to bit 63 in gpa2hpa

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According to SDM, bit N (physical address width) to bit 63 should be masked when calculate
host page frame number.
Currently, hypervisor doesn't set any of these bits, so gpa2hpa can work as expectd.
However, any of these bit set, gpa2hpa return wrong value.

Hypervisor never sets bit N to bit 51 (reserved bits), for simplicity, just mask bit 52 to bit 63.

Tracked-On: #3352
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Binbin Wu
2019-07-01 09:54:11 +08:00
committed by ACRN System Integration
parent c64877f519
commit 4a22801dd1
2 changed files with 3 additions and 1 deletions
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2
hypervisor/arch/x86/guest/ept.c
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@@ -44,7 +44,7 @@ uint64_t local_gpa2hpa(struct acrn_vm *vm, uint64_t gpa, uint32_t *size)
eptp = get_ept_entry(vm);
pgentry = lookup_address((uint64_t *)eptp, gpa, &pg_size, &vm->arch_vm.ept_mem_ops);
if (pgentry != NULL) {
hpa = ((*pgentry & (~(pg_size - 1UL)))
hpa = (((*pgentry & (~EPT_PFN_HIGH_MASK)) & (~(pg_size - 1UL)))
| (gpa & (pg_size - 1UL)));
}