----- "Avi Kivity" <avi@xxxxxxxxxx> wrote:
> On 08/25/2010 12:40 PM, Jason Wang wrote:
> > ----- "Avi Kivity"<avi@xxxxxxxxxx> wrote:
> >
> >> On 08/24/2010 04:47 PM, Jason Wang wrote:
> >>> TSS size should be 104 byte.
> >>>
> >>> Signed-off-by: Jason Wang<jasowang@xxxxxxxxxx>
> >>> ---
> >>> x86/cstart64.S | 2 +-
> >>> 1 files changed, 1 insertions(+), 1 deletions(-)
> >>>
> >>> diff --git a/x86/cstart64.S b/x86/cstart64.S
> >>> index 5d358ad..b871153 100644
> >>> --- a/x86/cstart64.S
> >>> +++ b/x86/cstart64.S
> >>> @@ -69,7 +69,7 @@ tss:
> >>> .long 0
> >>> .quad ring0stacktop - i * 4096
> >> ring 0 stack
> >>
> >>> .quad 0, 0, 0
> >> rings 1, 2, 3 stack
> > Hello avi:
> >
> > Rechek with the manual, there's no filed of RSP3. So this patch may
> > make sense.
>
> That is true. But please redo it to remove one 0 from the line above,
>
> not from the IST.
>
> > But unfortunately it breaks 64bit vmexit test. Triple
> > fault happens in setup_args(). Any suggestions or is there any thing
> I
> > missed?
>
> No idea. Can you post an ftrace of the crash?
>
The trace before triple fault:
......
qemu-kvm-8101 [002] 243.138507: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138508: kvm_exit: reason IO_INSTRUCTION rip 0x400e5f
qemu-kvm-8101 [002] 243.138508: kvm_pio: pio_read at 0x510 size 2 count 1
qemu-kvm-8101 [002] 243.138512: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138513: kvm_exit: reason IO_INSTRUCTION rip 0x400e71
qemu-kvm-8101 [002] 243.138514: kvm_emulate_insn: 0:400e71: ec (prot64)
qemu-kvm-8101 [002] 243.138515: kvm_pio: pio_write at 0x511 size 1 count 1
qemu-kvm-8101 [002] 243.138519: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138520: kvm_exit: reason IO_INSTRUCTION rip 0x400e71
qemu-kvm-8101 [002] 243.138521: kvm_emulate_insn: 0:400e71: ec (prot64)
qemu-kvm-8101 [002] 243.138521: kvm_pio: pio_write at 0x511 size 1 count 1
qemu-kvm-8101 [002] 243.138525: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138526: kvm_exit: reason CPUID rip 0x400ff7
qemu-kvm-8101 [002] 243.138526: kvm_cpuid: func 1 rax 6d3 rbx 800 rcx 80002001 rdx 78bfbfd
qemu-kvm-8101 [002] 243.138527: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138528: kvm_exit: reason EXCEPTION_NMI rip 0x400271
qemu-kvm-8101 [002] 243.138528: kvm_page_fault: address 40f3a0 error_code b
qemu-kvm-8101 [002] 243.138530: kvm_entry: vcpu 0
qemu-kvm-8101 [002] 243.138531: kvm_exit: reason TRIPLE_FAULT rip 0x400c15
>
> --
> I have a truly marvellous patch that fixes the bug which this
> signature is too narrow to contain.
>
> --
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