On Fri, Jul 20, 2007 at 09:57:55AM +0300, Avi Kivity wrote: > Avi Kivity wrote: > >> Please tell me what I can do to help debugging this problem. > >> Alternatively I have uploaded an image to reproduce the problem here: > >> http://temp.aurel32.net/kfreebsd-amd64.img.g > >> > > > > I've downloaded the image and booted it three times using kvm HEAD. > > Each time I got to the login prompt. > > > > Is this always reproducible? Can you check with kvm HEAD (not that I > > think of anything that could have fixed this). > > > > > > Sorry, that was on Intel. It reproduces easily on AMD.
By comparing the cases were the old and the new condition are different, I have found that the problem occurs for the lmsw and smsw instructions. The patch below is very ugly, but it workarounds the problem. diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c index 21ce977..6c1523f 100644 --- a/drivers/kvm/x86_emulate.c +++ b/drivers/kvm/x86_emulate.c @@ -1206,11 +1206,13 @@ twobyte_insn: goto cannot_emulate; *(u16 *)&_regs[modrm_rm] = realmode_get_cr(ctxt->vcpu, 0); + no_wb = 1; break; case 6: /* lmsw */ if (modrm_mod != 3) goto cannot_emulate; realmode_lmsw(ctxt->vcpu, (u16)modrm_val, &_eflags); + no_wb = 1; break; case 7: /* invlpg*/ -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel