qemu doesn't general protection fault if there are reserved bits set in page-directory-pointer table entries

Bug #1078892 reported by Alexander Chernyakhovsky on 2012-11-14
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
QEMU
Undecided
Unassigned

Bug Description

While working on implementing 32-bit PAE mode in a custom operating system, which I was testing in QEMU, I noticed that my OS worked correctly, but resulted in a general protection fault when booted on VMware, VirtualBox, or bochs.

According to the Intel Architecture Manual, Volume 3A, Section 4.4.1 "PDPTE Registers", "If any of the PDPTEs sets both the P flag (bit 0) and any reserved bit, the MOV to CR instruction causes a general-protection exception (#GP(0)) and the PDPTEs are not loaded." QEMU does not emulate this behavior.

To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers