From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 104631] New: Error on walk_shadow_page_get_mmio_spte when
 starting Qemu
Date: Wed, 16 Sep 2015 03:35:38 +0000
Message-ID: <bug-104631-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=104631

            Bug ID: 104631
           Summary: Error on walk_shadow_page_get_mmio_spte when starting
                    Qemu
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.3.0-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: tasos@tasossah.com
        Regression: Yes

Created attachment 187691
  --> https://bugzilla.kernel.org/attachment.cgi?id=187691&action=edit
Output from Qemu

Ever since I upgraded to 4.3-rc1 I have been unable to run Qemu with KVM.

The launch command for qemu used is:
QEMU_SDL_SAMPLES=3072 SDL_AUDIODRIVER=pulse QEMU_AUDIO_DRV=sdl
qemu-system-x86_64 -enable-kvm -M q35 -m 4096 -cpu host -smp
6,sockets=1,cores=6,threads=1 -bios /usr/share/seabios/bios.bin -device
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 -drive
file=vm_image.img,id=disk,format=raw -soundhw ac97

The version of Qemu is:
QEMU emulator version 2.2.0 (Debian 1:2.2+dfsg-5expubuntu9.4)

This kernel has been custom built from commit
6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f on Linus' kernel repo, with only
change being a patch that removes the 40-wire check on PATA controllers.

Hardware has AMD-v as well IOMMU enabled. Motherboard is an ASRock 990FX
Extreme 4 with an FX8350.

Looking at the commit logs, it seems that commit
47ab8751695f71d85562ff497e21b521c789247c
(
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/x86/kvm/mmu.c?id=47ab8751695f71d85562ff497e21b521c789247c
) might be related to this problem.

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