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xen-devel
[Xen-devel] Re: [PATCH 3/4] xen: more debugging in the e820 parsing
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 3/4] xen: more debugging in the e820 parsing |
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From: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
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Date: |
Thu, 14 Apr 2011 11:35:28 +0100 |
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Cc: |
"jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "mingo@xxxxxxx" <mingo@xxxxxxx>, "hpa@xxxxxxxxxxxxxxx" <hpa@xxxxxxxxxxxxxxx>, "yinghai@xxxxxxxxxx" <yinghai@xxxxxxxxxx> |
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Thu, 14 Apr 2011 03:36:33 -0700 |
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<alpine.DEB.2.00.1104121149280.22672@kaball-desktop> <1302607192-21355-3-git-send-email-stefano.stabellini@xxxxxxxxxxxxx> <20110412163957.GA1067@xxxxxxxxxxxx> <alpine.DEB.2.00.1104131118180.22672@kaball-desktop> <20110413175404.GA19390@xxxxxxxxxxxx> |
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Alpine 2.00 (DEB 1167 2008-08-23) |
On Wed, 13 Apr 2011, Konrad Rzeszutek Wilk wrote:
> > I have a machine here in which the e820 printed by Xen and the e820
> > in dom0 *before* any modifications differs:
> >
> > (XEN) Xen-e820 RAM map:
> > (XEN) 0000000000000000 - 000000000009fc00 (usable)
> > (XEN) 000000000009fc00 - 00000000000a0000 (reserved)
> > (XEN) 00000000000e0000 - 0000000000100000 (reserved)
> > (XEN) 0000000000100000 - 00000000beb96000 (usable)
> > (XEN) 00000000beb96000 - 00000000bed97000 (ACPI NVS)
> > (XEN) 00000000bed97000 - 00000000bf651000 (usable)
> > (XEN) 00000000bf651000 - 00000000bf6e9000 (ACPI NVS)
> > (XEN) 00000000bf6e9000 - 00000000bf6ec000 (usable)
> > (XEN) 00000000bf6ec000 - 00000000bf6ff000 (ACPI data)
> > (XEN) 00000000bf6ff000 - 00000000bf700000 (usable)
> >
> > [ 0.000000] e820_region: type=1 start=0000000000000000
> > end=000000000009fc00
> > [ 0.000000] e820_region: type=2 start=000000000009fc00
> > end=00000000000a0000
> > [ 0.000000] e820_region: type=2 start=00000000000e0000
> > end=0000000000100000
> > [ 0.000000] e820_region: type=1 start=0000000000100000
> > end=00000000beb96000
> > [ 0.000000] e820_region: type=4 start=00000000beb96000
> > end=00000000bed97000
> > [ 0.000000] e820_region: type=1 start=00000000bed97000
> > end=00000000bf651000
> > [ 0.000000] e820_region: type=4 start=00000000bf651000
> > end=00000000bf6e9000
> > [ 0.000000] e820_region: type=1 start=00000000bf6e9000
> > end=00000000bf6ec000
> > [ 0.000000] e820_region: type=3 start=00000000bf6ec000
> > end=00000000bf6ff000
> > [ 0.000000] e820_region: type=1 start=00000000bf6ff000
> > end=00000000bf700000
>
>
> > [ 0.000000] e820_region: type=2 start=00000000fec00000
> > end=00000000fec01000
> > [ 0.000000] e820_region: type=2 start=00000000fee00000
> > end=00000000fee01000
>
> Ah, so the IOAPIC regions don't show up in the E820. Do they show up in the
> E820 printed by the Linux kernel? If I use the Xen E820 output and what the
> guest prints for its E820 I seem to get even this "hidden" area.
Yes, that's right. However it might be confusing if you are trying to
debug the transformations made by xen/setup.c to the e820...
In any case I don't feel strongly about this, it is just that I found
myself adding these printk's more than once so I thought that it might
be good to have them in any case for debugging. On the other hand I add
printk's all the time so surely it won't kill me to add these ones too.
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