10 Jul
2020
10 Jul
'20
9:22 a.m.
On 09/07/20 21:13, Eduardo Habkost wrote:
Doesn't this require intercepting MOV-to-CR3 when the guest is in PAE mode, so that the hypervisor can validate the high bits in the PDPTEs? If the fix has additional overhead, is the additional overhead bad enough to warrant making it optional? Most existing GUEST_MAXPHYADDR < HOST_MAXPHYADDR guests already work today without the fix.
The problematic case is when host maxphyaddr is 52. That case wouldn't work at all without the fix. Paolo