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target-i386: Don't forbid NX bit on PAE PDEs and PTEs 

Commit e8f6d00c30 ("target-i386: raise
page fault for reserved physical address bits") added a check that the
NX bit is not set on PAE PDPEs, but it also added it to rsvd_mask for
the rest of the function. This caused any PDEs or PTEs with NX set to be
erroneously rejected, making PAE guests with NX support unusable.

Signed-off-by: William Grant <wgrant@ubuntu.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 1844e68eca)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
William Grant 2014-08-24 15:13:48 +10:00 committed by Michael Roth
parent 3d8cc86e4f
commit 72c9c9a05e
1 changed files with 2 additions and 2 deletions
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4
target-i386/helper.c
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@ -615,8 +615,8 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
if (!(pdpe & PG_PRESENT_MASK)) {
goto do_fault;
}
rsvd_mask |= PG_HI_USER_MASK | PG_NX_MASK;
if (pdpe & rsvd_mask) {
rsvd_mask |= PG_HI_USER_MASK;
if (pdpe & (rsvd_mask | PG_NX_MASK)) {
goto do_fault_rsvd;
}
ptep = PG_NX_MASK | PG_USER_MASK | PG_RW_MASK;