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Re: [Qemu-devel] VM can not boot after commit 235e898
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] VM can not boot after commit 235e898 |
Date: |
Wed, 24 Jul 2013 17:16:09 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 |
Il 24/07/2013 11:58, Alexander Graf ha scritto:
>> > No QEMU or kvm crashes, no error message printed, I mean it just hangs,
>> > even no BIOS information are printed.
>> > And "top" shows QEMU consumes 100% cpu.
>> >
>> > When I define DEBUG_KVM in kvm-all.c, and run QEMU(this time I boot a
>> > normal OS disk),
>> > # x86_64-softmmu/qemu-system-x86_64 -enable-kvm -hda
>> > /mnt/nfs/Images/debian-append.img
>> > kvm_init_vcpu
>> > kvm_cpu_exec()
>> > handle_io
>> > handle_io
>> > handle_io
>> > handle_io
>> >
>> > Only 4 debug messages(handle_io) are printed, then nothing is shown, and
>> > "top" shows QEMU process uses 100% CPU.
> After this we're running in an endless loop of:
>
> qemu-system-x86-9298 [003] ...1 162090.918845: kvm_emulate_insn:
> f0000:c489:66 ea 91 c4 0f 00 08 00 (prot16)
> qemu-system-x86-9298 [003] d..2 162090.918846: kvm_entry: vcpu 0
>
> (qemu) x /i $pc
> 0x00000000000fc489: ljmpl $0x8,$0xfc491
>
> With current master, qemu-system-x86_64 -enable-kvm is broken on at least 3.7
> kernels (openSUSE 12.3).
>
> Gleb, I don't remember all the glorious details of ljmpl, but would it have
> to raise an MMIO request for a read-only memory slot which it fails to do?
The point of KVM_CAP_READONLY_MEM should be that it doesn't.
So, even without debugging it, I guess we need a KVM_CAP_READONLY_MEM2
or something like that.
Paolo
- Re: [Qemu-devel] VM can not boot after commit 235e898, Alexander Graf, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898,
Paolo Bonzini <=
- Re: [Qemu-devel] VM can not boot after commit 235e898, Gleb Natapov, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Alexander Graf, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Gleb Natapov, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Alexander Graf, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Gleb Natapov, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Alexander Graf, 2013/07/24
- Re: [Qemu-devel] VM can not boot after commit 235e898, Gleb Natapov, 2013/07/25
- Re: [Qemu-devel] VM can not boot after commit 235e898, Andreas Färber, 2013/07/24