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From: Paolo Bonzini <pbonzini@redhat.com>
To: Markus Armbruster <armbru@redhat.com>,
	Peter Maydell <peter.maydell@linaro.org>
Cc: Peter Crosthwaite <crosthwaitepeter@gmail.com>,
	Alistair Francis <alistair.francis@xilinx.com>,
	Christopher Covington <cov@codeaurora.org>,
	"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v11 0/8] Add a generic loader
Date: Fri, 23 Sep 2016 10:18:04 +0200	[thread overview]
Message-ID: <7046636c-a89b-2991-083f-bf73bb29f070@redhat.com> (raw)
In-Reply-To: <87ponvxcit.fsf@dusky.pond.sub.org>



On 23/09/2016 10:10, Markus Armbruster wrote:
> For me, the similarity (at the conceptual level) to the persistent
> memory case is striking: in both cases, we need a backend to manage
> memory contents.  The difference is that for persistent memory, changes
> persist, while for the loader, they get reverted at reset.

Not just that.  For persistent memory, there is a MemoryRegion
corresponding to the memory _and_ an interface to manage it.

For the loader the contents are copied every time from an out-of-band
storage.

> An argument for using -device could go as follows: this is a device to
> monkey patch memory.  It needs a backend to manage the bits, just like
> other memory-related devices do.  Since its backend is trivial, we
> folded it in rather than make it a separate backend.

The backend is not just trivial, it is _literally_ a 64-bit value...  I
think "-object long,value=0x123456789abcdef0 is taking things a bit too far.

Paolo

> If we decide to use this argument for the present interface design, I
> want it recorded in the code and commit messages.

  reply	other threads:[~2016-09-23  8:18 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-20 14:54 [Qemu-devel] [PATCH v11 0/8] Add a generic loader Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 1/8] loader: Allow ELF loader to auto-detect the ELF arch Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 2/8] loader: Use the specified MemoryRegion Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 3/8] loader: Allow a custom AddressSpace when loading ROMs Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 4/8] loader: Add AddressSpace loading support to ELFs Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 5/8] loader: Add AddressSpace loading support to uImages Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 6/8] loader: Add AddressSpace loading support to targphys Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 7/8] generic-loader: Add a generic loader Alistair Francis
2016-09-20 14:54 ` [Qemu-devel] [PATCH v11 8/8] docs: Add a generic loader explanation document Alistair Francis
2016-09-20 17:41 ` [Qemu-devel] [PATCH v11 0/8] Add a generic loader Peter Maydell
2016-09-20 18:22   ` Alistair Francis
2016-09-21  6:05 ` Markus Armbruster
2016-09-21 15:46   ` Alistair Francis
2016-09-21 15:53     ` Paolo Bonzini
2016-09-22  9:19       ` Markus Armbruster
2016-09-22  9:22         ` Paolo Bonzini
2016-09-22 11:50           ` Markus Armbruster
2016-09-22 14:01             ` Peter Maydell
2016-09-23  8:10               ` Markus Armbruster
2016-09-23  8:18                 ` Paolo Bonzini [this message]
2016-09-27 13:28                   ` Markus Armbruster
2016-09-27 14:14                     ` Paolo Bonzini
2016-09-27 15:40                       ` Markus Armbruster
2016-09-27 16:24                         ` Alistair Francis
2016-09-28  2:04                           ` Markus Armbruster
2016-09-28 22:48                             ` Alistair Francis
2016-09-27 15:17                     ` Peter Maydell
2016-09-21 15:54   ` Daniel P. Berrange

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