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author | Paolo Bonzini <pbonzini@redhat.com> | 2013-10-31 22:05:24 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-29 19:28:05 (GMT) |
commit | 94152e4a439841a2b112ae234f98625e4fe5da47 (patch) | |
tree | 79b3fbbe6d96c21a5037e8f39cbaedce7c0e558f /sound | |
parent | 80b0114bac7c5552aab28100545f9cf12b477de4 (diff) | |
download | linux-fsl-qoriq-94152e4a439841a2b112ae234f98625e4fe5da47.tar.xz |
KVM: x86: fix emulation of "movzbl %bpl, %eax"
commit daf727225b8abfdfe424716abac3d15a3ac5626a upstream.
When I was looking at RHEL5.9's failure to start with
unrestricted_guest=0/emulate_invalid_guest_state=1, I got it working with a
slightly older tree than kvm.git. I now debugged the remaining failure,
which was introduced by commit 660696d1 (KVM: X86 emulator: fix
source operand decoding for 8bit mov[zs]x instructions, 2013-04-24)
introduced a similar mis-emulation to the one in commit 8acb4207 (KVM:
fix sil/dil/bpl/spl in the mod/rm fields, 2013-05-30). The incorrect
decoding occurs in 8-bit movzx/movsx instructions whose 8-bit operand
is sil/dil/bpl/spl.
Needless to say, "movzbl %bpl, %eax" does occur in RHEL5.9's decompression
prolog, just a handful of instructions before finally giving control to
the decompressed vmlinux and getting out of the invalid guest state.
Because OpMem8 bypasses decode_modrm, the same handling of the REX prefix
must be applied to OpMem8.
Reported-by: Michele Baldessari <michele@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions