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| author | Nadav Amit <namit@cs.technion.ac.il> | 2015-01-26 09:32:22 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-01-26 12:14:25 +0100 |
| commit | 16794aaaab66fa74ab19588a8e255a460e8b3ace (patch) | |
| tree | 35466fbdb5fac67987570583ae9b95ce19658e8b /arch/x86/kvm/x86.c | |
| parent | 2fcf5c8ae244b4c298d2111a288d410a719ac626 (diff) | |
| download | lwn-16794aaaab66fa74ab19588a8e255a460e8b3ace.tar.gz lwn-16794aaaab66fa74ab19588a8e255a460e8b3ace.zip | |
KVM: x86: Wrong operand size for far ret
Indeed, Intel SDM specifically states that for the RET instruction "In 64-bit
mode, the default operation size of this instruction is the stack-address size,
i.e. 64 bits."
However, experiments show this is not the case. Here is for example objdump of
small 64-bit asm:
4004f1: ca 14 00 lret $0x14
4004f4: 48 cb lretq
4004f6: 48 ca 14 00 lretq $0x14
Therefore, remove the Stack flag from far-ret instructions.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
0 files changed, 0 insertions, 0 deletions