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From: "Denis V. Lunev" <den@openvz.org>
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Date: Thu, 14 Jan 2016 14:33:04 +0300
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Subject: Re: [Qemu-devel] [PATCH 1/1] RESUME blk: do not select PFLASH
 device for internal snapshot
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Cc: Kevin Wolf <kwolf@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Laszlo Ersek <lersek@redhat.com>, qemu-devel@nongnu.org, qemu-block@nongnu.org

On 01/12/2016 09:03 AM, Denis V. Lunev wrote:
> There is a long-long story. OVMF VMs can not be snapsotted using
> 'virsh snapshot' as they have "pflash" device which is configured as
> "raw" image. There was a discussion in the past about that.

results of the discussion are available in this submission:
     [PATCH v5 0/8] QMP wrappers for VM snapshot operations