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[Qemu-devel] Re: [PATCH] kvm: Fix overlapping check for memory slots

From: Jan Kiszka
Subject: [Qemu-devel] Re: [PATCH] kvm: Fix overlapping check for memory slots
Date: Mon, 13 Apr 2009 11:42:35 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

Avi Kivity wrote:
> Jan Kiszka wrote:
>> This nice little buglet complicates a smarter slot management in qemu
>> user space just "slightly". Sigh...
>> -------->
>> When checking for overlapping slots on registration of a new one, kvm
>> currently also considers zero-length (ie. deleted) slots and rejects
>> requests incorrectly. This finally denies user space from joining slots.
>> Fix the check by skipping deleted slots.
> Can userspace fail gracefully when the bug is present?  If not, the you
> should add a KVM_CAP_ to advertise the fix; without the capability don't
> attempt the smarter slot management.

I already thought about adding some
in [1]. Maybe a good idea, comments welcome.


[1] http://permalink.gmane.org/gmane.comp.emulators.qemu/41326

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