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Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for init
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work |
Date: |
Wed, 21 Nov 2012 15:59:27 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121028 Thunderbird/16.0.2 |
On 21/11/12 15:56, Alexander Graf wrote:
> On 11/21/2012 03:46 PM, Christian Borntraeger wrote:
>> This provides a simple cpu load and save function. With the recent
>> addition of sync regs we have the crs,acrs, the prefix and the
>> PSW already up to date. Lets also save the fpu via pre/post hooks.
>>
>> This patch also changes the license of machine.c to GPLv2 or later.
>> (The old code was just empty glue code, so there is no need
>> to go the "contributions after" way).
>>
>> Signed-off-by: Christian Borntraeger<address@hidden>
>> ---
>> target-s390x/cpu.h | 1 +
>> target-s390x/machine.c | 115
>> ++++++++++++++++++++++++++++++++++++++++++------
>> 2 files changed, 103 insertions(+), 13 deletions(-)
>>
>> diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
>> index 0f9a1f7..ba695dd 100644
>> --- a/target-s390x/cpu.h
>> +++ b/target-s390x/cpu.h
>> @@ -27,6 +27,7 @@
>> #define ELF_MACHINE EM_S390
>>
>> #define CPUArchState struct CPUS390XState
>> +#define CPU_SAVE_VERSION 1
>>
>> #include "cpu-defs.h"
>> #define TARGET_PAGE_BITS 12
>> diff --git a/target-s390x/machine.c b/target-s390x/machine.c
>> index 3e79be6..02706fd 100644
>> --- a/target-s390x/machine.c
>> +++ b/target-s390x/machine.c
>> @@ -2,29 +2,118 @@
>> * QEMU S390x machine definitions
>> *
>> * Copyright (c) 2009 Alexander Graf<address@hidden>
>> + * Copyright IBM Corp. 2012
>> *
>> - * This library is free software; you can redistribute it and/or
>> - * modify it under the terms of the GNU Lesser General Public
>> - * License as published by the Free Software Foundation; either
>> - * version 2 of the License, or (at your option) any later version.
>> - *
>> - * This library is distributed in the hope that it will be useful,
>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> - * Lesser General Public License for more details.
>> - *
>> - * You should have received a copy of the GNU Lesser General Public
>> - * License along with this library; if not,
>> see<http://www.gnu.org/licenses/>.
>> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
>> your
>> + * option) any later version. See the COPYING file in the top-level
>> directory.
>> */
>>
>> #include "hw/hw.h"
>> #include "hw/boards.h"
>> +#include "cpu.h"
>> +#include "kvm.h"
>> +
>> +#if defined CONFIG_KVM
>> +static void cpu_pre_save(void *opaque)
>> +{
>> + CPUS390XState *env = opaque;
>> + struct kvm_fpu fpu;
>> + int i, r;
>> +
>> + if (!kvm_enabled()) {
>> + return;
>> + }
>> +
>> + r = kvm_vcpu_ioctl(env, KVM_GET_FPU,&fpu);
>> + assert(r == 0);
>> + for (i = 0; i< 16; i++) {
>> + env->fregs[i].ll = fpu.fprs[i];
>> + }
>> + env->fpc = fpu.fpc;
>> +}
>> +
>> +static int cpu_post_load(void *opaque, int version_id)
>> +{
>> + CPUS390XState *env = opaque;
>> + struct kvm_fpu fpu;
>> + int i, r;
>> +
>> + if (!kvm_enabled()) {
>> + return 0;
>> + }
>> +
>> + for (i = 0; i< 16; i++) {
>> + fpu.fprs[i] = env->fregs[i].ll;
>> + }
>> + fpu.fpc = env->fpc;
>> +
>> + r = kvm_vcpu_ioctl(env, KVM_SET_FPU,&fpu);
>> + assert(r == 0);
>> +
>> + return 0;
>> +}
>
> The kvm register sync needs to happen in the kvm register sync function :)
That would eliminate the whole purpose of sync regs and forces us to have an
expensive ioctl on lots of exits (again). I would prefer to sync the registers
that we never need in qemu just here.
- [Qemu-devel] [RFC/PATCH 0/3] Initial migration patches for s390, Christian Borntraeger, 2012/11/21
- [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Christian Borntraeger, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Alexander Graf, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work,
Christian Borntraeger <=
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Alexander Graf, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Christian Borntraeger, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Alexander Graf, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Christian Borntraeger, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Jan Kiszka, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Christian Borntraeger, 2012/11/21
- Re: [Qemu-devel] [PATCH 1/3] s390/migration: Provide a cpu save for initial life migration work, Jan Kiszka, 2012/11/21
[Qemu-devel] [PATCH 3/3] s390/migration: Add code to support SCLP live migration, Christian Borntraeger, 2012/11/21
[Qemu-devel] [PATCH 2/3] s390/migration: Qemu S390 special register migration, Christian Borntraeger, 2012/11/21