Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH] KVM: x86 emulator: fix debug reg mov instructions | Date | Tue, 31 Jul 2007 10:50:11 +0300 |
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More fallout from the writeback fixes: debug register transfer instructions do their own writeback and thus need to disable the general writeback mechanism. This fixes oopses and some guest failures on AMD machines (the Intel variant decodes the instruction in hardware and thus does not need emulation).
Cc: Alistair John Strachan <alistair@devzero.co.uk> Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c index 1f979cb..4b8a0cc 100644 --- a/drivers/kvm/x86_emulate.c +++ b/drivers/kvm/x86_emulate.c @@ -1217,11 +1217,13 @@ twobyte_insn: } break; case 0x21: /* mov from dr to reg */ + no_wb = 1; if (modrm_mod != 3) goto cannot_emulate; rc = emulator_get_dr(ctxt, modrm_reg, &_regs[modrm_rm]); break; case 0x23: /* mov from reg to dr */ + no_wb = 1; if (modrm_mod != 3) goto cannot_emulate; rc = emulator_set_dr(ctxt, modrm_reg, _regs[modrm_rm]); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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