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From: Pavel Fedin <p.fedin@samsung.com>
To: 'Peter Maydell' <peter.maydell@linaro.org>,
	'Alex Williamson' <alex.williamson@redhat.com>
Cc: 'QEMU Developers' <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] vfio: Align iova also to IOMMU page size
Date: Wed, 25 Nov 2015 10:00:40 +0300	[thread overview]
Message-ID: <00a201d1274e$ff0bf0c0$fd23d240$@samsung.com> (raw)
In-Reply-To: <CAFEAcA8LSBb0btqw3=MEkMPVAkbH1mO7WOcnGpsCmQyphjnFNA@mail.gmail.com>

 Hello!

> There are a number of different interesting page sizes here:
>  * the host kernel page size
>  * the target CPU architecture's worst-case smallest page size
>  * the page size the guest kernel is actually using at the moment
>    (consider a 4K-page guest kernel on a 64K-page host kernel)
> 
> These don't necessarily have to all be the same. I would
> expect VFIO to be interested in the host kernel page size,
> not TARGET_PAGE_ALIGN.

 So would the appropriate fix be just replacing TARGET_PAGE_ALIGN with HOST_PAGE_ALIGN?
 Alex: there's however, still no answer to "why are we aligning up, not down?" question..

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

  reply	other threads:[~2015-11-25  7:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-17  7:46 [Qemu-devel] [PATCH] vfio: Align iova also to IOMMU page size Pavel Fedin
2015-11-18 22:04 ` Alex Williamson
2015-11-19 10:29   ` Pavel Fedin
2015-11-19 23:33     ` Alex Williamson
2015-11-24 15:24       ` Pavel Fedin
2015-12-02 19:40         ` Alex Williamson
2015-12-03  9:02           ` Pavel Fedin
2015-12-03 16:26             ` Alex Williamson
2015-12-03 16:33               ` Peter Maydell
2015-12-03 17:19                 ` Alex Williamson
2015-12-03 17:36                   ` Peter Maydell
2015-12-03 17:58                     ` Alex Williamson
2015-12-07 10:53                       ` Pavel Fedin
2015-12-07 11:20                         ` Peter Maydell
2015-12-08 23:42                           ` Alex Williamson
2015-12-09  8:08                             ` Pavel Fedin
2015-12-09 10:09     ` Alex Bennée
2015-11-24 15:34   ` Peter Maydell
2015-11-25  7:00     ` Pavel Fedin [this message]
2015-12-02 19:05       ` Alex Williamson

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