From: Jan Kiszka <jan.kiszka@siemens.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Liu Ping Fan" <pingfank@linux.vnet.ibm.com>,
qemu-devel <qemu-devel@nongnu.org>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [RFC][PATCH 10/15] memory: Rework sub-page handling
Date: Tue, 07 May 2013 20:23:33 +0200 [thread overview]
Message-ID: <518946A5.5080503@siemens.com> (raw)
In-Reply-To: <51893933.4070508@siemens.com>
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
next prev parent reply other threads:[~2013-05-07 18:26 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-06 14:26 [Qemu-devel] [RFC][PATCH 00/15] Refactor portio dispatching Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 01/15] adlib: replace register_ioport* Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 02/15] applesmc: " Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 03/15] wdt_ib700: " Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 04/15] i82374: " Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 05/15] prep: " Jan Kiszka
2013-05-06 14:43 ` Andreas Färber
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 06/15] vt82c686: " Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 07/15] Privatize register_ioport_read/write Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 08/15] isa: implement isa_is_ioport_assigned via memory_region_find Jan Kiszka
2013-05-06 14:55 ` Andreas Färber
2013-05-06 14:59 ` Paolo Bonzini
2013-05-06 15:02 ` Jan Kiszka
2013-05-06 15:10 ` Paolo Bonzini
2013-05-06 14:59 ` Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 09/15] memory: Introduce address_space_lookup_region Jan Kiszka
2013-05-06 14:39 ` Paolo Bonzini
2013-05-06 14:51 ` Jan Kiszka
2013-05-06 14:54 ` Paolo Bonzini
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 10/15] memory: Rework sub-page handling Jan Kiszka
2013-05-06 20:09 ` Paolo Bonzini
2013-05-06 20:46 ` Peter Maydell
2013-05-07 9:48 ` Paolo Bonzini
2013-05-07 12:35 ` Paolo Bonzini
2013-05-07 17:26 ` Jan Kiszka
2013-05-07 18:23 ` Jan Kiszka [this message]
2013-05-08 8:41 ` Paolo Bonzini
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 11/15] memory: Allow unaligned address_space_rw Jan Kiszka
2013-05-06 14:55 ` Paolo Bonzini
2013-05-06 14:58 ` Jan Kiszka
2013-05-06 15:01 ` Paolo Bonzini
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 12/15] vmware-vga: Accept unaligned I/O accesses Jan Kiszka
2013-05-06 14:40 ` Paolo Bonzini
2013-05-06 14:45 ` Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 13/15] ioport: Switch dispatching to memory core layer Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 14/15] ioport: Remove unused old dispatching services Jan Kiszka
2013-05-06 14:26 ` [Qemu-devel] [RFC][PATCH 15/15] ioport: Move IOPortRead/WriteFunc typedefs to memory.h Jan Kiszka
2013-05-06 14:50 ` [Qemu-devel] [RFC][PATCH 00/15] Refactor portio dispatching Andreas Färber
2013-05-06 14:54 ` Jan Kiszka
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