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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-02-12 17:04:47 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-02-23 22:28:48 +0100 |
| commit | 4ff6f8e61eb7f96d3ca535c6d240f863ccd6fb7d (patch) | |
| tree | bfd41b00d5b6ae5797edb03d8d0459832d049cd0 /virt | |
| parent | KVM: VMX: fix build without CONFIG_SMP (diff) | |
| download | linux-4ff6f8e61eb7f96d3ca535c6d240f863ccd6fb7d.tar.xz linux-4ff6f8e61eb7f96d3ca535c6d240f863ccd6fb7d.zip | |
KVM: emulate: fix CMPXCHG8B on 32-bit hosts
This has been broken for a long time: it broke first in 2.6.35, then was
almost fixed in 2.6.36 but this one-liner slipped through the cracks.
The bug shows up as an infinite loop in Windows 7 (and newer) boot on
32-bit hosts without EPT.
Windows uses CMPXCHG8B to write to page tables, which causes a
page fault if running without EPT; the emulator is then called from
kvm_mmu_page_fault. The loop then happens if the higher 4 bytes are
not 0; the common case for this is that the NX bit (bit 63) is 1.
Fixes: 6550e1f165f384f3a46b60a1be9aba4bc3c2adad
Fixes: 16518d5ada690643453eb0aef3cc7841d3623c2d
Cc: stable@vger.kernel.org # 2.6.35+
Reported-by: Erik Rull <erik.rull@rdsoftware.de>
Tested-by: Erik Rull <erik.rull@rdsoftware.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions