From: Avi Kivity <avi@redhat.com>
To: Peter Lieven <pl@dlhnet.de>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org,
Gleb Natapov <gleb@redhat.com>
Subject: Re: race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race condition in qemu-kvm-1.0.1
Date: Mon, 02 Jul 2012 18:05:10 +0300 [thread overview]
Message-ID: <4FF1B8A6.2020101@redhat.com> (raw)
In-Reply-To: <4FEC2626.90402@dlhnet.de>
On 06/28/2012 12:38 PM, Peter Lieven wrote:
> does anyone know whats that here in handle_mmio?
>
> /* hack: Red Hat 7.1 generates these weird accesses. */
> if ((addr > 0xa0000-4 && addr <= 0xa0000) && kvm_run->mmio.len == 3)
> return 0;
>
Just what it says. There is a 4-byte access to address 0x9ffff. The
first byte lies in RAM, the next three bytes are in mmio. qemu is
geared to power-of-two accesses even though x86 can generate accesses to
any number of bytes between 1 and 8.
It appears that this has happened with your guest. It's not impossible
that it's genuine.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Peter Lieven <pl@dlhnet.de>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
Gleb Natapov <gleb@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race condition in qemu-kvm-1.0.1
Date: Mon, 02 Jul 2012 18:05:10 +0300 [thread overview]
Message-ID: <4FF1B8A6.2020101@redhat.com> (raw)
In-Reply-To: <4FEC2626.90402@dlhnet.de>
On 06/28/2012 12:38 PM, Peter Lieven wrote:
> does anyone know whats that here in handle_mmio?
>
> /* hack: Red Hat 7.1 generates these weird accesses. */
> if ((addr > 0xa0000-4 && addr <= 0xa0000) && kvm_run->mmio.len == 3)
> return 0;
>
Just what it says. There is a 4-byte access to address 0x9ffff. The
first byte lies in RAM, the next three bytes are in mmio. qemu is
geared to power-of-two accesses even though x86 can generate accesses to
any number of bytes between 1 and 8.
It appears that this has happened with your guest. It's not impossible
that it's genuine.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-07-02 15:05 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-27 15:39 race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race condition in qemu-kvm-1.0.1 Peter Lieven
2012-06-27 16:54 ` Jan Kiszka
2012-06-28 9:11 ` Peter Lieven
2012-06-28 9:21 ` Jan Kiszka
2012-06-28 9:31 ` Peter Lieven
2012-06-28 9:38 ` Peter Lieven
2012-07-02 15:05 ` Avi Kivity [this message]
2012-07-02 15:05 ` [Qemu-devel] " Avi Kivity
2012-07-02 15:57 ` Peter Lieven
2012-07-02 15:57 ` [Qemu-devel] " Peter Lieven
2012-07-03 13:01 ` Peter Lieven
2012-07-03 13:01 ` [Qemu-devel] " Peter Lieven
2012-07-03 13:13 ` Avi Kivity
2012-07-03 13:13 ` [Qemu-devel] " Avi Kivity
2012-07-03 13:15 ` Peter Lieven
2012-07-03 13:15 ` [Qemu-devel] " Peter Lieven
2012-07-03 13:25 ` Avi Kivity
2012-07-03 13:25 ` [Qemu-devel] " Avi Kivity
2012-07-04 14:57 ` Peter Lieven
2012-07-04 14:57 ` [Qemu-devel] " Peter Lieven
2012-07-04 23:12 ` Peter Lieven
2012-07-04 23:12 ` [Qemu-devel] " Peter Lieven
2012-07-05 6:48 ` Xiao Guangrong
2012-07-05 6:48 ` [Qemu-devel] " Xiao Guangrong
2012-06-28 9:39 ` Jan Kiszka
2012-06-28 10:13 ` Peter Lieven
2012-06-28 10:34 ` Peter Lieven
2012-07-05 8:51 ` Xiao Guangrong
2012-07-05 8:51 ` [Qemu-devel] " Xiao Guangrong
2012-07-05 12:42 ` Peter Lieven
2012-07-05 12:42 ` [Qemu-devel] " Peter Lieven
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