linux-kernel - Re: [PATCH v2 00/10] kvm: memory slot cleanups, fix, and increase

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20121215010355.GB27536@amt.cnet>
Date:	Fri, 14 Dec 2012 23:03:55 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	gleb@...hat.com, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 00/10] kvm: memory slot cleanups, fix, and increase

On Mon, Dec 10, 2012 at 10:32:39AM -0700, Alex Williamson wrote:
> v2: Update 02/10 to not check userspace_addr when slot is removed.
>     Yoshikawa-san withdrew objection to increase slot_bitmap prior
>     to his series to remove slot_bitmap.
> 
> This series does away with any kind of complicated resizing of the
> slot array and simply does a one time increase.  I do compact struct
> kvm_memory_slot a bit to take better advantage of the space we are
> using.  This reduces each slot from 64 bytes (x86_64) to 56 bytes.
> By enforcing the API around valid operations for an unused slot and
> fields that can be modified runtime, I found and was able to fix a
> bug in iommu mapping for slots.  The renames enabled me to find the
> previously posted bug fix for catching slot overlaps.
> 
> As mentioned in the series, the primary motivation for increasing
> memory slots is assigned devices.  With this, I've been able to
> assign 30 devices to a single VM and could have gone further, but
> ran out of SRIOV VFs.  Typical devices use anywhere from 2-4 slots
> and max out at 8 slots.  125 user slots (3 private slots) allows
> us to support between 28 and 56 typical devices per VM.
> 
> Tested on x86_64, compiled on ia64, powerpc, and s390.
> 
> Thanks,
> Alex

Applied, thanks.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/