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[Qemu-devel] [Bug 1212402] [NEW] Enabling KVM with recent QEMU builds fr


From: Julius Schwartzenberg
Subject: [Qemu-devel] [Bug 1212402] [NEW] Enabling KVM with recent QEMU builds from GIT hang at boot on Ubuntu Precise AMD64 kernel 3.8.0
Date: Wed, 14 Aug 2013 19:23:31 -0000

Public bug reported:

When I compile QEMU from GIT and run it with 
'./x86_64-softmmu/qemu-system-x86_64 -enable-kvm' it just hangs, the QEMU 
screen stays black. (Everything else in the GTK UI is responsive though, I can 
use the QEMU console as well.)
I'm running Ubuntu Precise with kernel 3.8.0-27-generic on an Intel Core2 Duo 
P9500.

With bisecting, I found this commit caused the problem:

235e8982ad393e5611cb892df54881c872eea9e1 is the first bad commit
commit 235e8982ad393e5611cb892df54881c872eea9e1
Author: Jordan Justen <address@hidden>
Date:   Wed May 29 01:27:26 2013 -0700

    kvm: support using KVM_MEM_READONLY flag for regions

    For readonly memory regions and rom devices in romd_mode,
    we make use of the KVM_MEM_READONLY. A slot that uses
    KVM_MEM_READONLY can be read from and code can execute from the
    region, but writes will exit to qemu.

    For rom devices with !romd_mode, we force the slot to be
    removed so reads or writes to the region will exit to qemu.
    (Note that a memory region in this state is not executable
    within kvm.)

    v7:
     * Update for readable => romd_mode rename (5f9a5ea1)

    Signed-off-by: Jordan Justen <address@hidden>
    Reviewed-by: Xiao Guangrong <address@hidden> (v4)
    Reviewed-by: Paolo Bonzini <address@hidden> (v5)
    Message-id: address@hidden
    Signed-off-by: Anthony Liguori <address@hidden>

:100644 100644 327ae12f08b9dddc796d753d8adfb1f70c78b2c1
8e7bbf8698f6bcaa5ae945ef86e7b51effde06fe M      kvm-all.c

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1212402

Title:
  Enabling KVM with recent QEMU builds from GIT hang at boot on Ubuntu
  Precise AMD64 kernel 3.8.0

Status in QEMU:
  New

Bug description:
  When I compile QEMU from GIT and run it with 
'./x86_64-softmmu/qemu-system-x86_64 -enable-kvm' it just hangs, the QEMU 
screen stays black. (Everything else in the GTK UI is responsive though, I can 
use the QEMU console as well.)
  I'm running Ubuntu Precise with kernel 3.8.0-27-generic on an Intel Core2 Duo 
P9500.

  With bisecting, I found this commit caused the problem:

  235e8982ad393e5611cb892df54881c872eea9e1 is the first bad commit
  commit 235e8982ad393e5611cb892df54881c872eea9e1
  Author: Jordan Justen <address@hidden>
  Date:   Wed May 29 01:27:26 2013 -0700

      kvm: support using KVM_MEM_READONLY flag for regions

      For readonly memory regions and rom devices in romd_mode,
      we make use of the KVM_MEM_READONLY. A slot that uses
      KVM_MEM_READONLY can be read from and code can execute from the
      region, but writes will exit to qemu.

      For rom devices with !romd_mode, we force the slot to be
      removed so reads or writes to the region will exit to qemu.
      (Note that a memory region in this state is not executable
      within kvm.)

      v7:
       * Update for readable => romd_mode rename (5f9a5ea1)

      Signed-off-by: Jordan Justen <address@hidden>
      Reviewed-by: Xiao Guangrong <address@hidden> (v4)
      Reviewed-by: Paolo Bonzini <address@hidden> (v5)
      Message-id: address@hidden
      Signed-off-by: Anthony Liguori <address@hidden>

  :100644 100644 327ae12f08b9dddc796d753d8adfb1f70c78b2c1
  8e7bbf8698f6bcaa5ae945ef86e7b51effde06fe M      kvm-all.c

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