KVM recently started emulating DIV and IDIV. However, those instructions
trap when given the right operands. Since figuring out when to trap or not
is difficult, we just execute the instruction and see if the processor trapped
or not.
Avi Kivity (2):
x86: allow kernel exception fixup for divide errors (#DE)
- dropped
KVM: x86 emulator: add macros for executing instructions that may
trap
KVM: x86 emulator: trap and propagate #DE from DIV and IDIV
- propagate return code to x86_emulate_insn()
arch/x86/kvm/emulate.c | 63 ++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 59 insertions(+), 4 deletions(-)
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