From: "Michael S. Tsirkin" <mst@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [RFC PATCH 0/3] Balloon inhibit enhancements
Date: Mon, 30 Jul 2018 17:51:28 +0300 [thread overview]
Message-ID: <20180730174601-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20180730083939.23f3b9cc@t450s.home>
On Mon, Jul 30, 2018 at 08:39:39AM -0600, Alex Williamson wrote:
> This is more
> compatible with the IOMMU mappings,
Precisely. These are at page granularity.
> but I don't think it can be done
> atomically with respect to inflight DMA of a physical device where we
> cannot halt the device without interfering with its state.
Guests never add pages to the balloon if they are under DMA,
so that's fine - there's never an in-flight DMA, if
there is guest is buggy and it's ok to crash it.
--
MST
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] [RFC PATCH 0/3] Balloon inhibit enhancements
Date: Mon, 30 Jul 2018 17:51:28 +0300 [thread overview]
Message-ID: <20180730174601-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20180730083939.23f3b9cc@t450s.home>
On Mon, Jul 30, 2018 at 08:39:39AM -0600, Alex Williamson wrote:
> This is more
> compatible with the IOMMU mappings,
Precisely. These are at page granularity.
> but I don't think it can be done
> atomically with respect to inflight DMA of a physical device where we
> cannot halt the device without interfering with its state.
Guests never add pages to the balloon if they are under DMA,
so that's fine - there's never an in-flight DMA, if
there is guest is buggy and it's ok to crash it.
--
MST
next prev parent reply other threads:[~2018-07-30 14:51 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-17 22:47 [RFC PATCH 0/3] Balloon inhibit enhancements Alex Williamson
2018-07-17 22:47 ` [Qemu-devel] " Alex Williamson
2018-07-17 22:47 ` [RFC PATCH 1/3] balloon: Allow nested inhibits Alex Williamson
2018-07-17 22:47 ` [Qemu-devel] " Alex Williamson
2018-07-18 6:40 ` Peter Xu
2018-07-18 6:40 ` [Qemu-devel] " Peter Xu
2018-07-18 16:37 ` Alex Williamson
2018-07-18 16:37 ` [Qemu-devel] " Alex Williamson
2018-07-19 4:45 ` Peter Xu
2018-07-19 4:45 ` [Qemu-devel] " Peter Xu
2018-07-17 22:47 ` [RFC PATCH 2/3] kvm: Use inhibit to prevent ballooning without synchronous mmu Alex Williamson
2018-07-17 22:47 ` [Qemu-devel] " Alex Williamson
2018-07-17 22:47 ` [RFC PATCH 3/3] vfio: Inhibit ballooning Alex Williamson
2018-07-17 22:47 ` [Qemu-devel] " Alex Williamson
2018-07-18 6:48 ` [RFC PATCH 0/3] Balloon inhibit enhancements Peter Xu
2018-07-18 6:48 ` [Qemu-devel] " Peter Xu
2018-07-18 9:36 ` Cornelia Huck
2018-07-18 9:36 ` [Qemu-devel] " Cornelia Huck
2018-07-19 4:49 ` Peter Xu
2018-07-19 4:49 ` [Qemu-devel] " Peter Xu
2018-07-19 8:42 ` Cornelia Huck
2018-07-19 8:42 ` [Qemu-devel] " Cornelia Huck
2018-07-19 9:30 ` Peter Xu
2018-07-19 9:30 ` [Qemu-devel] " Peter Xu
2018-07-19 15:31 ` Alex Williamson
2018-07-19 15:31 ` [Qemu-devel] " Alex Williamson
2018-07-18 16:31 ` Alex Williamson
2018-07-18 16:31 ` [Qemu-devel] " Alex Williamson
2018-07-19 5:40 ` Peter Xu
2018-07-19 5:40 ` [Qemu-devel] " Peter Xu
2018-07-19 15:01 ` Alex Williamson
2018-07-19 15:01 ` [Qemu-devel] " Alex Williamson
2018-07-20 2:56 ` Peter Xu
2018-07-20 2:56 ` [Qemu-devel] " Peter Xu
2018-07-30 13:34 ` Michael S. Tsirkin
2018-07-30 13:34 ` [Qemu-devel] " Michael S. Tsirkin
2018-07-30 13:54 ` David Hildenbrand
2018-07-30 13:54 ` [Qemu-devel] " David Hildenbrand
2018-07-30 13:59 ` Michael S. Tsirkin
2018-07-30 13:59 ` [Qemu-devel] " Michael S. Tsirkin
2018-07-30 14:46 ` David Hildenbrand
2018-07-30 14:46 ` [Qemu-devel] " David Hildenbrand
2018-07-30 14:58 ` Michael S. Tsirkin
2018-07-30 14:58 ` [Qemu-devel] " Michael S. Tsirkin
2018-07-30 15:05 ` David Hildenbrand
2018-07-30 15:05 ` [Qemu-devel] " David Hildenbrand
2018-07-30 14:39 ` Alex Williamson
2018-07-30 14:39 ` [Qemu-devel] " Alex Williamson
2018-07-30 14:51 ` Michael S. Tsirkin [this message]
2018-07-30 14:51 ` Michael S. Tsirkin
2018-07-30 15:01 ` Alex Williamson
2018-07-30 15:01 ` [Qemu-devel] " Alex Williamson
2018-07-30 15:49 ` Michael S. Tsirkin
2018-07-30 15:49 ` [Qemu-devel] " Michael S. Tsirkin
2018-07-30 16:42 ` Alex Williamson
2018-07-30 16:42 ` [Qemu-devel] " Alex Williamson
2018-07-30 17:35 ` Michael S. Tsirkin
2018-07-30 17:35 ` [Qemu-devel] " Michael S. Tsirkin
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