From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: David Gibson <david@gibson.dropbear.id.au>,
benh@kernel.crashing.org, agraf@suse.de
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 3/6] pseries: Simplify handling of the hash page table fd
Date: Mon, 8 Feb 2016 17:20:15 +1100 [thread overview]
Message-ID: <56B8339F.9040207@ozlabs.ru> (raw)
In-Reply-To: <1454638439-11938-4-git-send-email-david@gibson.dropbear.id.au>
On 02/05/2016 01:13 PM, David Gibson wrote:
> When migrating the 'pseries' machine type with KVM, we use a special fd
> to access the hash page table stored within KVM. Usually, this fd is
> opened at the beginning of migration, and kept open until the migration
> is complete.
>
> However, if there is a guest reset during the migration, the fd can become
> stale and we need to re-open it. At the moment we use an 'htab_fd_stale'
> flag in sPAPRMachineState to signal this, which is checked in the migration
> iterators.
>
> But that's rather ugly. It's simpler to just close and invalidate the
> fd on reset, and lazily re-open it in migration if necessary. This patch
> implements that change.
>
> This requires a small addition to the machine state's instance_init,
> so that htab_fd is initialized to -1 (telling the migration code it
> needs to open it) instead of 0, which could be a valid fd.
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
--
Alexey
next prev parent reply other threads:[~2016-02-08 6:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 2:13 [Qemu-devel] [PATCH 0/6] Cleanups to Hash Page Table handling David Gibson
2016-02-05 2:13 ` [Qemu-devel] [PATCH 1/6] target-ppc: Remove unused kvmppc_update_sdr1() stub David Gibson
2016-02-08 5:39 ` Alexey Kardashevskiy
2016-02-05 2:13 ` [Qemu-devel] [PATCH 2/6] target-ppc: Include missing MMU models for SDR1 in info registers David Gibson
2016-02-08 5:39 ` Alexey Kardashevskiy
2016-02-05 2:13 ` [Qemu-devel] [PATCH 3/6] pseries: Simplify handling of the hash page table fd David Gibson
2016-02-08 6:20 ` Alexey Kardashevskiy [this message]
2016-02-05 2:13 ` [Qemu-devel] [PATCH 4/6] pseries: Move hash page table allocation to reset time David Gibson
2016-02-08 4:44 ` Alexey Kardashevskiy
2016-02-08 23:30 ` David Gibson
2016-02-05 2:13 ` [Qemu-devel] [PATCH 5/6] target-ppc: Remove hack for ppc_hash64_load_hpte*() with HV KVM David Gibson
2016-02-08 6:35 ` Alexey Kardashevskiy
2016-02-05 2:13 ` [Qemu-devel] [PATCH 6/6] target-ppc: Add helpers for updating a CPU's SDR1 and external HPT David Gibson
2016-02-08 5:07 ` Alexey Kardashevskiy
2016-02-08 5:11 ` Alexey Kardashevskiy
2016-02-08 23:34 ` David Gibson
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