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Re: [Qemu-ppc] [Qemu-devel] [PATCH] linux-user/ppc: Implement swapcontex

From: Peter Maydell
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] linux-user/ppc: Implement swapcontext syscall
Date: Thu, 19 Jul 2018 16:48:48 +0100

On 19 July 2018 at 16:24, Richard Henderson
<address@hidden> wrote:
> On 07/19/2018 06:05 AM, Alex Bennée wrote:
>> I'm confused by the lock_user_struct/unlock_user_struct which AFAICT are
>> basically access checks. Is there an implied locking I'm missing?
> I have no idea why those have that name.  There's no lock,
> just a validation of the underlying pages and a transform to
> the corresponding host address.

Mmm, it's unclear. It came in via 53a5960aadd542dd, and the
impression I get is that the idea was to try to decouple from
knowing that the guest memory layout is flat, as a preparation
for possible support for softmmu-in-usermode...

-- PMM

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