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From: Mark Rutland <mark.rutland@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Geoff Levand <geoff@infradead.org>,
	Will Deacon <Will.Deacon@arm.com>,
	"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	Marc Zyngier <Marc.Zyngier@arm.com>,
	Deepak Saxena <dsaxena@linaro.org>,
	"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>,
	"grant.likely@linaro.org" <grant.likely@linaro.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 0/8] arm64 kexec kernel patches V7
Date: Mon, 26 Jan 2015 18:55:25 +0000	[thread overview]
Message-ID: <20150126185524.GN23313@leverpostej> (raw)
In-Reply-To: <20150126174414.GF14048@e104818-lin.cambridge.arm.com>

On Mon, Jan 26, 2015 at 05:44:14PM +0000, Catalin Marinas wrote:
> Hi Geoff,
> 
> On Sat, Jan 17, 2015 at 12:23:34AM +0000, Geoff Levand wrote:
> > This series adds the core support for kexec re-boots on arm64.  This v7 of the
> > series is mainly just a rebase to the latest arm64 for-next/core branch
> > (v3.19-rc4), and a few very minor changes requested for v6.
> 
> I haven't looked at the series in detail before, so some of my comments
> may have already been discussed.
> 
> > Several things are known to have problems on kexec re-boot:
> > 
> > spin-table
> 
> I think that's not too bad, for complete kexec support (SMP->SMP) we can
> require some CPU unplug mechanism and PSCI is one of them.
> 
> > FIX: Upgrade system firmware to provide PSCI enable method support or add
> > missing spin-table support to the kernel.
> 
> What's the missing spin-table support?

As you mention above, a mechanism for returning the CPUs to FW. There is
no spec for doing this with spin-table, which would have to be written
and vetted.

Mark.

_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: mark.rutland@arm.com (Mark Rutland)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/8] arm64 kexec kernel patches V7
Date: Mon, 26 Jan 2015 18:55:25 +0000	[thread overview]
Message-ID: <20150126185524.GN23313@leverpostej> (raw)
In-Reply-To: <20150126174414.GF14048@e104818-lin.cambridge.arm.com>

On Mon, Jan 26, 2015 at 05:44:14PM +0000, Catalin Marinas wrote:
> Hi Geoff,
> 
> On Sat, Jan 17, 2015 at 12:23:34AM +0000, Geoff Levand wrote:
> > This series adds the core support for kexec re-boots on arm64.  This v7 of the
> > series is mainly just a rebase to the latest arm64 for-next/core branch
> > (v3.19-rc4), and a few very minor changes requested for v6.
> 
> I haven't looked at the series in detail before, so some of my comments
> may have already been discussed.
> 
> > Several things are known to have problems on kexec re-boot:
> > 
> > spin-table
> 
> I think that's not too bad, for complete kexec support (SMP->SMP) we can
> require some CPU unplug mechanism and PSCI is one of them.
> 
> > FIX: Upgrade system firmware to provide PSCI enable method support or add
> > missing spin-table support to the kernel.
> 
> What's the missing spin-table support?

As you mention above, a mechanism for returning the CPUs to FW. There is
no spec for doing this with spin-table, which would have to be written
and vetted.

Mark.

  parent reply	other threads:[~2015-01-26 18:55 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1415926876.git.geoff@infradead.orgg>
2015-01-17  0:23 ` [PATCH 0/8] arm64 kexec kernel patches V7 Geoff Levand
2015-01-17  0:23   ` Geoff Levand
2015-01-17  0:23   ` [PATCH 2/8] arm64: Convert hcalls to use ISS field Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-26 18:26     ` Catalin Marinas
2015-01-26 18:26       ` Catalin Marinas
2015-01-30 23:31       ` Geoff Levand
2015-01-30 23:31         ` Geoff Levand
2015-02-02 16:04         ` Catalin Marinas
2015-02-02 16:04           ` Catalin Marinas
2015-01-30 23:33     ` [PATCH v2 " Geoff Levand
2015-01-30 23:33       ` Geoff Levand
2015-02-19 20:57       ` Christoffer Dall
2015-02-19 20:57         ` Christoffer Dall
2015-02-25 22:09         ` Geoff Levand
2015-02-25 22:09           ` Geoff Levand
2015-03-02 22:13           ` Christoffer Dall
2015-03-02 22:13             ` Christoffer Dall
2015-03-02 23:22             ` Geoff Levand
2015-03-02 23:22               ` Geoff Levand
2015-03-03 21:47               ` Christopher Covington
2015-03-03 21:47                 ` Christopher Covington
2015-03-03 22:35                 ` Geoff Levand
2015-03-03 22:35                   ` Geoff Levand
2015-01-17  0:23   ` [PATCH 3/8] arm64: Add new hcall HVC_CALL_FUNC Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-27 17:39     ` Catalin Marinas
2015-01-27 17:39       ` Catalin Marinas
2015-01-27 18:00       ` Mark Rutland
2015-01-27 18:00         ` Mark Rutland
2015-01-30 21:52       ` Geoff Levand
2015-01-30 21:52         ` Geoff Levand
2015-01-17  0:23   ` [PATCH 7/8] arm64/kexec: Add checks for KVM Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-26 19:19     ` Mark Rutland
2015-01-26 19:19       ` Mark Rutland
2015-01-26 20:39       ` Christoffer Dall
2015-01-26 20:39         ` Christoffer Dall
2015-01-26 20:58         ` Geoff Levand
2015-01-26 20:58           ` Geoff Levand
2015-01-26 21:00       ` Geoff Levand
2015-01-26 21:00         ` Geoff Levand
2015-01-29  9:36       ` AKASHI Takahiro
2015-01-29  9:36         ` AKASHI Takahiro
2015-01-29  9:57       ` AKASHI Takahiro
2015-01-29  9:57         ` AKASHI Takahiro
2015-01-29 10:59         ` Marc Zyngier
2015-01-29 10:59           ` Marc Zyngier
2015-01-29 18:47           ` Mark Rutland
2015-01-29 18:47             ` Mark Rutland
2015-01-30  6:10             ` AKASHI Takahiro
2015-01-30  6:10               ` AKASHI Takahiro
2015-01-30 12:14               ` Mark Rutland
2015-01-30 12:14                 ` Mark Rutland
2015-01-30 19:48               ` Geoff Levand
2015-01-30 19:48                 ` Geoff Levand
2015-02-02  8:18                 ` AKASHI Takahiro
2015-02-02  8:18                   ` AKASHI Takahiro
2015-02-06  0:11                   ` Geoff Levand
2015-02-06  0:11                     ` Geoff Levand
2015-02-06  4:18                     ` AKASHI Takahiro
2015-02-06  4:18                       ` AKASHI Takahiro
2015-02-06  7:06                       ` Geoff Levand
2015-02-06  7:06                         ` Geoff Levand
2015-01-17  0:23   ` [PATCH 1/8] arm64: Move proc-macros.S to include/asm Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-26 17:45     ` Catalin Marinas
2015-01-26 17:45       ` Catalin Marinas
2015-01-27 19:33     ` [PATCH V2 1/8] arm64: Fold proc-macros.S into assembler.h Geoff Levand
2015-01-27 19:33       ` Geoff Levand
2015-01-17  0:23   ` [PATCH 6/8] arm64/kexec: Add pr_devel output Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-17  0:23   ` [PATCH 8/8] arm64/kexec: Enable kexec in the arm64 defconfig Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-17  0:23   ` [PATCH 5/8] arm64/kexec: Add core kexec support Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-26 19:16     ` Mark Rutland
2015-01-26 19:16       ` Mark Rutland
2015-01-17  0:23   ` [PATCH 4/8] arm64: Add EL2 switch to soft_restart Geoff Levand
2015-01-17  0:23     ` Geoff Levand
2015-01-26 19:02     ` Mark Rutland
2015-01-26 19:02       ` Mark Rutland
2015-01-26 21:48       ` Geoff Levand
2015-01-26 21:48         ` Geoff Levand
2015-01-27 16:46         ` Mark Rutland
2015-01-27 16:46           ` Mark Rutland
2015-01-27 18:34           ` Geoff Levand
2015-01-27 18:34             ` Geoff Levand
2015-01-27 17:57     ` Catalin Marinas
2015-01-27 17:57       ` Catalin Marinas
2015-01-30 21:47       ` Geoff Levand
2015-01-30 21:47         ` Geoff Levand
2015-01-26 17:44   ` [PATCH 0/8] arm64 kexec kernel patches V7 Catalin Marinas
2015-01-26 17:44     ` Catalin Marinas
2015-01-26 18:37     ` Grant Likely
2015-01-26 18:37       ` Grant Likely
2015-01-26 18:55     ` Mark Rutland [this message]
2015-01-26 18:55       ` Mark Rutland
2015-01-26 20:57     ` Geoff Levand
2015-01-26 20:57       ` Geoff Levand

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