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Re: [Qemu-devel] [PATCH 00/17] ppc: preparing pnv landing

From: Cédric Le Goater
Subject: Re: [Qemu-devel] [PATCH 00/17] ppc: preparing pnv landing
Date: Tue, 15 Mar 2016 09:11:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.6.0

On 03/15/2016 01:39 AM, David Gibson wrote:
> On Mon, Mar 14, 2016 at 05:56:23PM +0100, Cédric Le Goater wrote:
>> Hello,
>> This is a first mini-serie of patches adding support for new ppc SPRs.
>> They were taken from Ben's larger patchset adding the ppc powernv
>> platform and they should already be useful for the pseries guest
>> migration.
>> Initial patches come from :
>>      https://github.com/ozbenh/qemu/commits/powernv
>> The changes are mostly due to the rebase on Dave's 2.6 branch:
>>      https://github.com/dgibson/qemu/commits/ppc-for-2.6
>> A couple more are bisect and checkpatch fixes and finally some patches
>> were merge to reduce the noise.
>> The patchset is also available here: 
>>      https://github.com/legoater/qemu/commits/for-2.6
>> It was quickly tested with a pseries guest using KVM and TCG.
> Hmm.. do these all fix bugs with migration, or only some of them?

Probably only some. 

Initially, Thomas gave a shorter list which I expanded to a larger one 
because of dependencies between patches and I didn't want to change too
much what Ben had sent. You had also reviewed a few.

> The relevance is that things to fix migration should go into 2.6, but
> preparation work for powernv that doesn't fix bug shouldn't really be
> going in now, after the soft freeze and will need to wait for 2.7.

OK. I will rework and keep the rest for 2.7. 

Thomas, thanks for the review. I have identified a few things I need 
to work on but may be, the patchset is still too large for 2.6 ? 

Full list is below. 



>> Benjamin Herrenschmidt (17):
>>   ppc: Update SPR definitions
>>   ppc: Add macros to register hypervisor mode SPRs
>>   ppc: Add a bunch of hypervisor SPRs to Book3s
>>   ppc: Add number of threads per core to the processor definition
>>   ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV
>>   ppc: Create cpu_ppc_set_papr() helper
>>   ppc: Better figure out if processor has HV mode
>>   ppc: Add placeholder SPRs for DPDES and DHDES on P8
>>   ppc: SPURR & PURR are HV writeable and privileged
>>   ppc: Add dummy SPR_IC for POWER8
>>   ppc: Initialize AMOR in PAPR mode
>>   ppc: Fix writing to AMR/UAMOR
>>   ppc: Add POWER8 IAMR register
>>   ppc: Add dummy write to VTB
>>   ppc: Add dummy POWER8 MPPR register
>>   ppc: Add dummy CIABR SPR
>>   ppc: A couple more dummy POWER8 Book4 regs
>>  hw/ppc/spapr.c              |  11 +-
>>  target-ppc/cpu-qom.h        |   1 +
>>  target-ppc/cpu.h            |  68 ++++++-
>>  target-ppc/excp_helper.c    |   8 +-
>>  target-ppc/helper_regs.h    |   4 +-
>>  target-ppc/translate.c      |  30 +--
>>  target-ppc/translate_init.c | 461 
>> ++++++++++++++++++++++++++++++++++++++++----
>>  7 files changed, 510 insertions(+), 73 deletions(-)

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