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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Ian Campbell <ian.campbell@citrix.com>,
	Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
	"julieng julien.grall"@citrix.com, ian.jackson@eu.citrix.com,
	Wei Liu <wei.liu2@citrix.com>
Cc: xen-devel@lists.xen.org
Subject: Re: [PATCH RFC v1 00/14] xen: arm: support for save restore and dead migration
Date: Wed, 9 Dec 2015 15:51:20 +0000	[thread overview]
Message-ID: <56684DF8.7030507@citrix.com> (raw)
In-Reply-To: <1449671507.16124.264.camel@citrix.com>

On 09/12/15 14:31, Ian Campbell wrote:
> For arm32 + gicv2 systems the following supports apparently successful
> save/restore as well dead migrate a domain.
>
> There are several caveats/blockers, hence RFC.
>
>  * GIC v2 support only, no GIC v3 at all
>  * ARM32 only. Doesn't even build for ARM64 (vfp state handling needs
>    adjustment)
>  * No live migration, only "dead" (no logdirty support yet)
>  * Have not fully audited the set of state which needs to be saved (i.e. I
>    might have missed some registers or something)
>
> On the flip side, thanks to migration v2 the toolstack side of this
> practically trivial.

Glad to hear this.

> This is (of course) using the current Xen hvm blob handling strata, which I
> believe there are plans afoot to rework along the lines of the libxc/libxl
> migration v2 protocol.

Yes - I have plans as part of fixing cpuid handling for x86.

>
> For now I have no problem waiting and reworking in that vein as things
> progress, clearly the blockers/caveats (logdirty support in particular) are
> going to take some time to sort out.
> This is all based (very distantly) on some original patches from Evgeny
> Fedotov and Junghyun Yoo (both of Samsung) however very little of that code
> remains here.
>
> As well as the Xen series there will be a single Linux patch too, I'll only
> CC ARM folks on that one.

Something towards the end of this series should update
docs/features/migration.pandoc to indicate the presence of ARM support.

~Andrew

  parent reply	other threads:[~2015-12-09 15:51 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-09 14:31 [PATCH RFC v1 00/14] xen: arm: support for save restore and dead migration Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 01/14] xen: arm: Add gic_hw_desc Ian Campbell
2015-12-15 16:15   ` Stefano Stabellini
2015-12-15 16:21     ` Ian Campbell
2015-12-15 16:35       ` Andrew Cooper
2015-12-15 16:56         ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 02/14] xen: arm: Provide a mechanism to read (and decode) an LR from a saved VCPU Ian Campbell
2015-12-15 16:22   ` Stefano Stabellini
2015-12-09 14:32 ` [PATCH RFC XEN v1 03/14] xen: arm: switch arch_do_domctl to a common exit path Ian Campbell
2015-12-15 16:34   ` Stefano Stabellini
2015-12-15 16:57     ` Ian Campbell
2015-12-15 17:07       ` Andrew Cooper
2015-12-15 17:11       ` Jan Beulich
2015-12-09 14:32 ` [PATCH RFC XEN v1 04/14] xen: arm: Implement XEN_DOMCTL_getpageframeinfo3 Ian Campbell
2015-12-15 16:44   ` Stefano Stabellini
2015-12-09 14:32 ` [PATCH RFC XEN v1 05/14] xen: arm: Implement basic XEN_DOMCTL_{set, get}hvmcontext support Ian Campbell
2015-12-15 18:00   ` Stefano Stabellini
2015-12-16 10:18     ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 06/14] xen: arm: Add some basic platform info to save header Ian Campbell
2015-12-15 18:37   ` Stefano Stabellini
2015-12-16 10:20     ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 07/14] xen: arm: Save and restore basic per-VCPU state Ian Campbell
2015-12-16 14:55   ` Stefano Stabellini
2015-12-16 15:04     ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 08/14] xen: arm: Save and restore arch timer state Ian Campbell
2015-12-16 15:53   ` Stefano Stabellini
2015-12-16 16:02     ` Ian Campbell
2015-12-16 16:17       ` Julien Grall
2015-12-16 16:37         ` Ian Campbell
2015-12-16 18:05       ` Stefano Stabellini
2015-12-17  9:33         ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 09/14] xen: arm: Save and restore GIC state Ian Campbell
2015-12-16 18:30   ` Stefano Stabellini
2015-12-17  9:54     ` Ian Campbell
2015-12-22 16:44       ` Stefano Stabellini
2015-12-09 14:32 ` [PATCH RFC XEN v1 10/14] tools: Switch a few CONFIG_MIGRATE features to CONFIG_X86 Ian Campbell
2015-12-09 15:16   ` Andrew Cooper
2015-12-09 14:32 ` [PATCH RFC XEN v1 11/14] tools: migrate: refactor selection of save/restore ops to be arch specific Ian Campbell
2015-12-09 15:26   ` Andrew Cooper
2015-12-09 15:33     ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 12/14] tools: libxc: implement modify_returncode for ARM Ian Campbell
2015-12-16 16:22   ` Stefano Stabellini
2015-12-16 16:36     ` Ian Campbell
2015-12-09 14:32 ` [PATCH RFC XEN v1 13/14] tools: libxc: wire up migration " Ian Campbell
2015-12-09 15:48   ` Andrew Cooper
2015-12-09 14:32 ` [PATCH RFC XEN v1 14/14] tools/libxl: BODGE ARM save/restore and (dead) migration Ian Campbell
2015-12-09 14:33 ` [PATCH RFC LINUX v1] xen: arm: enable migration on ARM Ian Campbell
2016-01-06 17:47   ` Stefano Stabellini
2016-01-06 17:57     ` Stefano Stabellini
2016-01-07  9:47       ` Ian Campbell
2016-01-07  9:43     ` Ian Campbell
2016-01-06 17:55   ` Stefano Stabellini
2016-01-07  9:47     ` Ian Campbell
2016-01-07 11:32   ` Stefano Stabellini
2015-12-09 15:51 ` Andrew Cooper [this message]
2015-12-09 16:09   ` [PATCH RFC v1 00/14] xen: arm: support for save restore and dead migration Ian Campbell

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