[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC][PATCH 10/15] memory: Rework sub-page handling
|
From: |
Jan Kiszka |
|
Subject: |
Re: [Qemu-devel] [RFC][PATCH 10/15] memory: Rework sub-page handling |
|
Date: |
Tue, 07 May 2013 20:23:33 +0200 |
|
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2013-05-07 19:26, Jan Kiszka wrote:
> Well, the alternative is to handle a sub-page dispatch (ie. calling into
> subpage_[ram_]read/write just like address_space_rw: take the necessary
> lock that protect mapping changes, look into the sub-page and pick up
> the target region, invoke memory_region_ref on it, perform the access
> and unref the region again. Slow, but that's how sub-pages are. And it
> only affects TCG. Hmm, or does your IOMMU core cache translations on a
> per-page base as well?
OK, there is no translation caching in the memory core. So I will
preserve the dispatching functions of sub-pages, just like the term
"sub-page" - along with a comment why we depend on page granularity.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
- [Qemu-devel] [RFC][PATCH 03/15] wdt_ib700: replace register_ioport*, (continued)
- [Qemu-devel] [RFC][PATCH 03/15] wdt_ib700: replace register_ioport*, Jan Kiszka, 2013/05/06
- [Qemu-devel] [RFC][PATCH 14/15] ioport: Remove unused old dispatching services, Jan Kiszka, 2013/05/06
- [Qemu-devel] [RFC][PATCH 06/15] vt82c686: replace register_ioport*, Jan Kiszka, 2013/05/06
- [Qemu-devel] [RFC][PATCH 02/15] applesmc: replace register_ioport*, Jan Kiszka, 2013/05/06
- [Qemu-devel] [RFC][PATCH 10/15] memory: Rework sub-page handling, Jan Kiszka, 2013/05/06
[Qemu-devel] [RFC][PATCH 08/15] isa: implement isa_is_ioport_assigned via memory_region_find, Jan Kiszka, 2013/05/06
[Qemu-devel] [RFC][PATCH 11/15] memory: Allow unaligned address_space_rw, Jan Kiszka, 2013/05/06