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Re: [Qemu-devel] [memory] abort with head a8170e5
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [memory] abort with head a8170e5 |
Date: |
Mon, 29 Oct 2012 16:30:08 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Oct 29, 2012 at 05:17:05PM +0200, Avi Kivity wrote:
> On 10/29/2012 09:54 AM, Aurelien Jarno wrote:
> > On Thu, Oct 25, 2012 at 06:12:06PM +0200, Avi Kivity wrote:
> >> On 10/25/2012 04:39 PM, Aurelien Jarno wrote:
> >> > On Thu, Oct 25, 2012 at 03:47:34PM +0200, Avi Kivity wrote:
> >> >> On 10/24/2012 04:00 PM, Aurelien Jarno wrote:
> >> >> >
> >> >> > mips is also broken but by commit
> >> >> > 1c380f9460522f32c8dd2577b2a53d518ec91c6d:
> >> >> >
> >> >> > | [ 0.436000] PCI: Enabling device 0000:00:0a.1 (0000 -> 0001)
> >> >> > | Segmentation fault (core dumped)
> >> >> >
> >> >>
> >> >> How do you reproduce it?
> >> >
> >> > You can use the mips kernel version 2.6.32 from:
> >> > http://people.debian.org/~aurel32/qemu/mips/
> >> >
> >> > Then just run it with the following command:
> >> > qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta -append
> >> > "console=tty0"
> >> >
> >> > (You can also get the README command line if you don't care about
> >> > downloading the disk image).
> >>
> >> Doesn't reproduce here with this command line (upstream + the bridge
> >> patch).
> >>
> >> [ 0.568000] PCI: Enabling device 0000:00:12.0 (0000 -> 0002)
> >> [ 0.572000] cirrusfb 0000:00:12.0: Cirrus Logic chipset on PCI bus,
> >> RAM (4096 kB) at 0x10000000
> >>
> >> ...
> >>
> >> [ 1.172000] PCI: Enabling device 0000:00:0a.1 (0000 -> 0001)
> >> [ 1.188000] scsi0 : ata_piix
> >>
> >> (with console=ttyS0)
> >
> > Ok, looks like I didn't provide the right command line. I am only able
> > to reproduce it when using -nographic, and only with -vga cirrus (yes it
> > starts to be quite strange). In that case it's better to pass
> > console=ttyS0, even if you can reproduce it with console=tty0.
> >
> > In short it seems heavily related to the cirrus VGA card.
>
> I was able to reproduce it, and in fact it's unrelated to VGA, it's deep in
> the memory core.
>
> Please try this patch:
>
> From: Avi Kivity <address@hidden>
> Date: Mon, 29 Oct 2012 17:07:09 +0200
> Subject: [PATCH] memory: fix rendering of a region obscured by another
>
> The memory core drops regions that are hidden by another region (for example,
> during BAR sizing), but it doesn't do so correctly if the lower address of the
> existing range is below the lower address of the new range.
>
> Example (qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta
> -append "console=ttyS0" -nographic -vga cirrus):
>
> Existing range: 10000000-107fffff
> New range: 100a0000-100bffff
>
> Correct behaviour: drop new range
> Incorrect behaviour: add new range
>
> Fix by taking this case into account (previously we only considered
> equal lower boundaries).
>
> Signed-off-by: Avi Kivity <address@hidden>
>
> diff --git a/memory.c b/memory.c
> index 36bb9a5..243cb23 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -539,12 +539,12 @@ static void render_memory_region(FlatView *view,
> offset_in_region += int128_get64(now);
> int128_subfrom(&remain, now);
> }
> - if (int128_eq(base, view->ranges[i].addr.start)) {
> - now = int128_min(remain, view->ranges[i].addr.size);
> - int128_addto(&base, now);
> - offset_in_region += int128_get64(now);
> - int128_subfrom(&remain, now);
> - }
> + now = int128_sub(int128_min(int128_add(base, remain),
> + addrrange_end(view->ranges[i].addr)),
> + base);
> + int128_addto(&base, now);
> + offset_in_region += int128_get64(now);
> + int128_subfrom(&remain, now);
> }
> if (int128_nz(remain)) {
> fr.mr = mr;
>
Thanks a lot for the patch, it fixes the problem and I have been able to
boot a MIPS guest up to the login prompt.
Tested-by: Aurelien Jarno <address@hidden>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
[Qemu-devel] [PATCH] pci: avoid destroying bridge address space windows in a transaction, Avi Kivity, 2012/10/25