Hi, Further investigation to the issue revealed that this happens before the guest OS get to execute. KVM is not able to emulate a PF happened during a jump to 0x40000000.
Folowing is the trace of instructions at which the emulation error is happening. ---------------- IN: CR3: 00000000b8590000 CR2: 0000000000000000 0x00000000000eecc4: push %ebx 0x00000000000eecc5: xor %ecx,%ecx 0x00000000000eecc7: mov (%eax,%ecx,1),%bl 0x00000000000eecca: cmp (%edx,%ecx,1),%bl 0x00000000000eeccd: je 0xeecdc vmexit(0000004e, 0000000000000000, 00000000000f5ea0, 00000000000eecc4)! CR2: 0000000000000000 vmsave! 00000000b8592000 FS: 0000000000000000 | 0000000000000000 vmload! 00000000b8592000 FS: 0000000000000000 | 0000000000000000 vmrun! 00000000b8592000 CR3: 00000000b86bd000 CR2: 0000000000000000 ---------------- IN: CR3: 00000000b8590000 CR2: 0000000000000000 0x00000000000eeccf: setl %al 0x00000000000eecd2: movzbl %al,%eax 0x00000000000eecd5: neg %eax 0x00000000000eecd7: or $0x1,%eax 0x00000000000eecda: jmp 0xeece3 ---------------- IN: CR3: 00000000b8590000 CR2: 0000000000000000 0x00000000000eece3: pop %ebx *0x00000000000eece4: ret * vmexit(0000004e, 0000000000000000, 0000000040000000, 0000000040000000)! CR2: 0000000000000000 vmsave! 00000000b8592000 FS: 0000000000000000 | 0000000000000000 ---------------- Bold ret instruction causes a VMEXIT due to page fault. Can anyone please help me figure out possible causes for this issue? Thanks, Anand On Mon, Oct 24, 2016 at 2:35 PM, Anand J <anand.induk...@gmail.com> wrote: > > ---------- Forwarded message ---------- > From: Anand J <anand.induk...@gmail.com> > Date: Mon, Oct 24, 2016 at 4:28 AM > Subject: facing issue with qemu amd-v support > To: qemu-disc...@nongnu.org > > > Hi, > > I'm running fedora-24_x86_64 inside qemu in software mode. I configured > KVM in the guest OS and want to run qemu inside the guest with kvm enabled. > But qemu is throwing the following error. Does anybody know how to fix this? > > KVM internal error. Suberror: 1 > emulation failure > EAX=ffffffff EBX=4000004b ECX=00000000 EDX=000f5ea0 > ESI=00000000 EDI=00000000 EBP=00000000 ESP=00006fd0 > EIP=40000000 EFL=00000086 [--S--P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 > ES =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] > CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA] > SS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] > DS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] > FS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] > GS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] > LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT > TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy > GDT= 000f7180 00000037 > IDT= 000f71be 00000000 > CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000 > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 > DR3=0000000000000000 > DR6=00000000ffff0ff0 DR7=0000000000000400 > EFER=0000000000000000 > Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 > > > Thanks, > Anand > >