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From: Paul Mackerras <paulus@ozlabs.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org
Subject: Re: [PATCH] powerpc/64s: handle ISA v3.1 local copy-paste context switches
Date: Thu, 3 Sep 2020 11:19:40 +1000	[thread overview]
Message-ID: <20200903011940.GH272502@thinks.paulus.ozlabs.org> (raw)
In-Reply-To: <20200825075535.224536-1-npiggin@gmail.com>

On Tue, Aug 25, 2020 at 05:55:35PM +1000, Nicholas Piggin wrote:
> The ISA v3.1 the copy-paste facility has a new memory move functionality
> which allows the copy buffer to be pasted to domestic memory (RAM) as
> opposed to foreign memory (accelerator).
> 
> This means the POWER9 trick of avoiding the cp_abort on context switch if
> the process had not mapped foreign memory does not work on POWER10. Do the
> cp_abort unconditionally there.
> 
> KVM must also cp_abort on guest exit to prevent copy buffer state leaking
> between contexts.
> 
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

For the KVM part:

Acked-by: Paul Mackerras <paulus@ozlabs.org>

  reply	other threads:[~2020-09-03  1:21 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-25  7:55 [PATCH] powerpc/64s: handle ISA v3.1 local copy-paste context switches Nicholas Piggin
2020-09-03  1:19 ` Paul Mackerras [this message]
2020-09-09 13:27 ` Michael Ellerman

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