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Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models |
Date: |
Tue, 18 Oct 2011 18:40:34 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:7.0) Gecko/20110927 Thunderbird/7.0 |
On 10/18/2011 04:30 PM, Avi Kivity wrote:
> This takes a while to reproduce, let me talk to gdb for a bit.
>
a vcpu exit causes kvm_flush_coalesced_mmio_buffer() to run, which does
a bitblt, which is cirrus_do_copy(), which goes to vga_hw_update, which
does vga_update_display(), which calls
qemu_flush_coalesced_mmio_buffer(), which is not reentrant.
It's easy to make qemu_flush_coalesced_mmio_buffer reentrant:
if (s->coalesced_flush_in_progress) {
return;
}
it isn't very pretty and is also a lie. Other ideas?
I'll probably commit this soon to avoid the regression, to be replaced
by a better fix when we find it.
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Blue Swirl, 2011/10/15
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Avi Kivity, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Avi Kivity, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Avi Kivity, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models,
Avi Kivity <=
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Avi Kivity, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Avi Kivity, 2011/10/19
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Jan Kiszka, 2011/10/19
- Re: [Qemu-devel] [PATCH 1/2] Move graphic-related coalesced MMIO flushes to affected device models, Alon Levy, 2011/10/18