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Re: [Xen-devel] [PATCH] xc_map_foreign_pages(), a convenient alternative

To: "Tian\, Kevin" <kevin.tian@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] xc_map_foreign_pages(), a convenient alternative to xc_map_foreign_batch()
From: Markus Armbruster <armbru@xxxxxxxxxx>
Date: Thu, 06 Sep 2007 13:20:13 +0200
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In-reply-to: <D470B4E54465E3469E2ABBC5AFAC390F013B2205@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> (Kevin Tian's message of "Thu\, 6 Sep 2007 16\:49\:55 +0800")
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References: <D470B4E54465E3469E2ABBC5AFAC390F013B2202@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <C3057D2C.152F1%Keir.Fraser@xxxxxxxxxxxx> <D470B4E54465E3469E2ABBC5AFAC390F013B2205@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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"Tian, Kevin" <kevin.tian@xxxxxxxxx> writes:

>>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
>>Sent: 2007年9月6日 16:47
>>On 6/9/07 08:44, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:
>>> Just curious why this can't be fixed in kernel driver? Is there case that
>>> caller is tolerable with partial mapping?
>>We would need an extra command in the kernel driver, as the current
>>partial-success semantics are used appropriately by some callers. Doing
>>in libxc avoids requiring a kernel upgrade to fix this issue.
>> -- Keir
> Interesting... any example I can learn? Yes, compatibility is one concern.
> Thanks,
> Kevin

Have a look at qemu_remap_bucket() in tools/ioemu/vl.c.

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