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Re: [PATCH 0/2] exclude hyperv synic sections from vhost

From: Jason Wang
Subject: Re: [PATCH 0/2] exclude hyperv synic sections from vhost
Date: Thu, 9 Jan 2020 11:00:24 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 2020/1/8 下午9:53, Dr. David Alan Gilbert (git) wrote:
From: "Dr. David Alan Gilbert" <address@hidden>

Hyperv's synic (that we emulate) is a feature that allows the guest
to place some magic (4k) pages of RAM anywhere it likes in GPA.
This confuses vhost's RAM section merging when these pages
land over the top of hugepages.

Hi David:

A silly question, is this because the alignment when adding sections? If yes, what's the reason for doing alignment which is not a must for vhost memory table.


Since they're not normal RAM, and they shouldn't have vhost DMAing
into them, exclude them from the vhost set.

I do that by marking them as device-ram and then excluding device-ram
from vhost.

bz: https://bugzilla.redhat.com/show_bug.cgi?id=1779041

Dr. David Alan Gilbert (2):
   vhost: Don't pass ram device sections
   hyperv/synic: Allocate as ram_device

  hw/hyperv/hyperv.c | 14 ++++++++------
  hw/virtio/vhost.c  |  1 +
  2 files changed, 9 insertions(+), 6 deletions(-)

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