From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: Roman Kagan <rkagan@virtuozzo.com>,
mst@redhat.com,
"Dr. David Alan Gilbert \(git\)" <dgilbert@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [PATCH 0/2] exclude hyperv synic sections from vhost
Date: Thu, 09 Jan 2020 10:07:50 +0100 [thread overview]
Message-ID: <87tv55q9p5.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <53359208-3cd9-b0b6-f424-a5135e770fca@redhat.com>
Jason Wang <jasowang@redhat.com> writes:
> On 2020/1/8 下午9:53, Dr. David Alan Gilbert (git) wrote:
>> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
>>
>> 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.
SynIC regions are two 4k pages and they are picked by the guest, not the
host. These can be anywhere in guest's ram.
--
Vitaly
next prev parent reply other threads:[~2020-01-09 9:08 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 13:53 [PATCH 0/2] exclude hyperv synic sections from vhost Dr. David Alan Gilbert (git)
2020-01-08 13:53 ` [PATCH 1/2] vhost: Don't pass ram device sections Dr. David Alan Gilbert (git)
2020-01-09 11:45 ` Michael S. Tsirkin
2020-01-09 11:56 ` Michael S. Tsirkin
2020-01-09 12:38 ` Roman Kagan
2020-01-09 12:42 ` Michael S. Tsirkin
2020-01-08 13:53 ` [PATCH 2/2] hyperv/synic: Allocate as ram_device Dr. David Alan Gilbert (git)
2020-01-09 11:48 ` Michael S. Tsirkin
2020-01-09 12:08 ` Dr. David Alan Gilbert
2020-01-09 12:18 ` Michael S. Tsirkin
2020-01-09 12:22 ` Dr. David Alan Gilbert
2020-01-09 13:00 ` Vitaly Kuznetsov
2020-01-09 13:24 ` Roman Kagan
2020-01-09 13:28 ` Dr. David Alan Gilbert
2020-01-09 16:12 ` Roman Kagan
2020-01-09 16:27 ` Dr. David Alan Gilbert
2020-01-09 17:13 ` Roman Kagan
2020-01-09 13:06 ` Michael S. Tsirkin
2020-01-09 13:22 ` Dr. David Alan Gilbert
2020-01-09 13:27 ` Michael S. Tsirkin
2020-01-09 13:28 ` Michael S. Tsirkin
2020-01-09 13:40 ` Dr. David Alan Gilbert
2020-01-09 15:31 ` Paolo Bonzini
2020-01-09 15:38 ` Dr. David Alan Gilbert
2020-01-09 15:40 ` Vitaly Kuznetsov
2020-07-07 10:54 ` Paolo Bonzini
2020-01-09 13:03 ` Roman Kagan
2020-01-09 13:08 ` Dr. David Alan Gilbert
2020-01-08 14:26 ` [PATCH 0/2] exclude hyperv synic sections from vhost Vitaly Kuznetsov
2020-01-09 3:00 ` Jason Wang
2020-01-09 9:07 ` Vitaly Kuznetsov [this message]
2020-01-09 12:02 ` Dr. David Alan Gilbert
2020-01-09 12:14 ` Michael S. Tsirkin
2020-01-09 11:53 ` Roman Kagan
2020-01-09 12:16 ` Dr. David Alan Gilbert
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