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Re: [qemu-s390x] [Qemu-devel] [PATCH v5 4/6] s390x/vfio: ap: Introduce V

From: Tony Krowiak
Subject: Re: [qemu-s390x] [Qemu-devel] [PATCH v5 4/6] s390x/vfio: ap: Introduce VFIO AP device
Date: Mon, 14 May 2018 15:18:54 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

On 05/11/2018 06:29 AM, Halil Pasic wrote:

On 05/10/2018 03:10 PM, Tony Krowiak wrote:
If I did not. I think this is a big problem. We need to at least
zeroize the queues (e.g. on system reset)  to avoid leaking
sensitive information. Without this, there is no sane way to use
ap-passthrough. Or am I wrong?

I do not have a definitive answer, I will have to look into it.
I'm thinking that since we are using ap-passthrough, the AP bus
running on the guest would be responsible for handling reset possibly
by resetting or zeroizing its queues. I'll get back to you on this.

You are on the wrong track. What I'm talking about is the responsibility
of the hypervisor and not the responsibility of the guest.

I think Pierre covered it in his reply.


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