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Re: [Qemu-devel] [RFC PATCH] QEMU may write to system_memory before gues


From: Igor Mammedov
Subject: Re: [Qemu-devel] [RFC PATCH] QEMU may write to system_memory before guest starts
Date: Tue, 19 Mar 2019 14:12:32 +0100

On Tue, 19 Mar 2019 12:53:49 +0000
Peter Maydell <address@hidden> wrote:

> On Tue, 19 Mar 2019 at 12:42, Igor Mammedov <address@hidden> wrote:
> > on aarch(64) we also load dtb into main RAM currently only on boot,  
> 
> Hmm? We load the DTB in hw/arm/boot.c using rom_add_blob_fixed_as(),
> which means that it will use this "rom blob loading" mechanism,
> so it should be re-copied into RAM on reset.
yep, you are right I confused it with with mutable content issue
below.

> > and I was planning to move it to reset stage to accommodate
> > hotplug usecase so that guest would pick up hotplugged
> > devices after reboot.  
> 
> The problem here is that this is trying to change the
> contents of the DTB blob on a reboot, which is not
> supported by the ROM blob mechanism, which assumes that
> these things are immutable.
That was the problem I've actually met.

> 
> thanks
> -- PMM




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