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Message-Id: <d6e522e2-187e-04f3-440d-62b9d6d3b71f@linux.ibm.com>
Date: Mon, 20 Apr 2020 10:25:16 +0200
From: Janosch Frank <frankja@...ux.ibm.com>
To: Christian Borntraeger <borntraeger@...ibm.com>,
Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>,
pbonzini@...hat.com, tsbogend@...ha.franken.de, paulus@...abs.org,
mpe@...erman.id.au, benh@...nel.crashing.org, david@...hat.com,
cohuck@...hat.com, heiko.carstens@...ibm.com, gor@...ux.ibm.com,
sean.j.christopherson@...el.com, vkuznets@...hat.com,
wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
hpa@...or.com, maz@...nel.org, james.morse@....com,
julien.thierry.kdev@...il.com, suzuki.poulose@....com,
christoffer.dall@....com, peterx@...hat.com, thuth@...hat.com
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] KVM: s390: clean up redundant 'kvm_run' parameters
On 4/20/20 9:07 AM, Christian Borntraeger wrote:
>
>
> On 19.04.20 09:51, Tianjia Zhang wrote:
>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
>> structure. Earlier than historical reasons, many kvm-related function
>> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time.
>> This patch does a unified cleanup of these remaining redundant parameters.
>>
>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>> ---
>> arch/s390/kvm/kvm-s390.c | 127 +++++++++++++++++++++------------------
>> 1 file changed, 67 insertions(+), 60 deletions(-)
>>
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 443af3ead739..cf420d013ba3 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -4173,24 +4173,25 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
>> return rc;
>> }
>>
>> -static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> +static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
>> {
>> + struct kvm_run *run = vcpu->run;
>
> Please use kvm_run as variable name. This makes all of the changes below go away.
Definitely
@Tianjia
This patch produces way to much churn to be picked up as is.
I do not want patches that touch so much for small cosmetic changes.
>
>
>> struct runtime_instr_cb *riccb;
>> struct gs_cb *gscb;
>>
>> - riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
>> - gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
>> - vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
>> - vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
>> - if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
>> - vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
>> - vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
>> - vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
>> - }
>> - if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
>> - vcpu->arch.pfault_token = kvm_run->s.regs.pft;
>> - vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
>> - vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
>> + riccb = (struct runtime_instr_cb *) &run->s.regs.riccb;
>> + gscb = (struct gs_cb *) &run->s.regs.gscb;
>> + vcpu->arch.sie_block->gpsw.mask = run->psw_mask;
>> + vcpu->arch.sie_block->gpsw.addr = run->psw_addr;
>> + if (run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
>> + vcpu->arch.sie_block->todpr = run->s.regs.todpr;
>> + vcpu->arch.sie_block->pp = run->s.regs.pp;
>> + vcpu->arch.sie_block->gbea = run->s.regs.gbea;
>> + }
>> + if (run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
>> + vcpu->arch.pfault_token = run->s.regs.pft;
>> + vcpu->arch.pfault_select = run->s.regs.pfs;
>> + vcpu->arch.pfault_compare = run->s.regs.pfc;
>> if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
>> kvm_clear_async_pf_completion_queue(vcpu);
>> }
>> @@ -4198,7 +4199,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> * If userspace sets the riccb (e.g. after migration) to a valid state,
>> * we should enable RI here instead of doing the lazy enablement.
>> */
>> - if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
>> + if ((run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
>> test_kvm_facility(vcpu->kvm, 64) &&
>> riccb->v &&
>> !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
>> @@ -4209,7 +4210,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> * If userspace sets the gscb (e.g. after migration) to non-zero,
>> * we should enable GS here instead of doing the lazy enablement.
>> */
>> - if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
>> + if ((run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
>> test_kvm_facility(vcpu->kvm, 133) &&
>> gscb->gssm &&
>> !vcpu->arch.gs_enabled) {
>> @@ -4218,10 +4219,10 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
>> vcpu->arch.gs_enabled = 1;
>> }
>> - if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
>> + if ((run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
>> test_kvm_facility(vcpu->kvm, 82)) {
>> vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
>> - vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
>> + vcpu->arch.sie_block->fpf |= run->s.regs.bpbc ? FPF_BPBC : 0;
>> }
>> if (MACHINE_HAS_GS) {
>> preempt_disable();
>> @@ -4232,45 +4233,47 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> }
>> if (vcpu->arch.gs_enabled) {
>> current->thread.gs_cb = (struct gs_cb *)
>> - &vcpu->run->s.regs.gscb;
>> + &run->s.regs.gscb;
>> restore_gs_cb(current->thread.gs_cb);
>> }
>> preempt_enable();
>> }
>> - /* SIE will load etoken directly from SDNX and therefore kvm_run */
>> + /* SIE will load etoken directly from SDNX and therefore run */
>> }
>>
>> -static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> +static void sync_regs(struct kvm_vcpu *vcpu)
>> {
>> - if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
>> - kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
>> - if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
>> - memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
>> + struct kvm_run *run = vcpu->run;
>> +
>> + if (run->kvm_dirty_regs & KVM_SYNC_PREFIX)
>> + kvm_s390_set_prefix(vcpu, run->s.regs.prefix);
>> + if (run->kvm_dirty_regs & KVM_SYNC_CRS) {
>> + memcpy(&vcpu->arch.sie_block->gcr, &run->s.regs.crs, 128);
>> /* some control register changes require a tlb flush */
>> kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
>> }
>> - if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
>> - kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
>> - vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
>> + if (run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
>> + kvm_s390_set_cpu_timer(vcpu, run->s.regs.cputm);
>> + vcpu->arch.sie_block->ckc = run->s.regs.ckc;
>> }
>> save_access_regs(vcpu->arch.host_acrs);
>> - restore_access_regs(vcpu->run->s.regs.acrs);
>> + restore_access_regs(run->s.regs.acrs);
>> /* save host (userspace) fprs/vrs */
>> save_fpu_regs();
>> vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
>> vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
>> if (MACHINE_HAS_VX)
>> - current->thread.fpu.regs = vcpu->run->s.regs.vrs;
>> + current->thread.fpu.regs = run->s.regs.vrs;
>> else
>> - current->thread.fpu.regs = vcpu->run->s.regs.fprs;
>> - current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
>> + current->thread.fpu.regs = run->s.regs.fprs;
>> + current->thread.fpu.fpc = run->s.regs.fpc;
>> if (test_fp_ctl(current->thread.fpu.fpc))
>> /* User space provided an invalid FPC, let's clear it */
>> current->thread.fpu.fpc = 0;
>>
>> /* Sync fmt2 only data */
>> if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
>> - sync_regs_fmt2(vcpu, kvm_run);
>> + sync_regs_fmt2(vcpu);
>> } else {
>> /*
>> * In several places we have to modify our internal view to
>> @@ -4282,19 +4285,21 @@ static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> * do only accept the condition code from userspace.
>> */
>> vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
>> - vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
>> + vcpu->arch.sie_block->gpsw.mask |= run->psw_mask &
>> PSW_MASK_CC;
>> }
>>
>> - kvm_run->kvm_dirty_regs = 0;
>> + run->kvm_dirty_regs = 0;
>> }
>>
>> -static void store_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> +static void store_regs_fmt2(struct kvm_vcpu *vcpu)
>> {
>> - kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
>> - kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
>> - kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
>> - kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
>> + struct kvm_run *run = vcpu->run;
>> +
>> + run->s.regs.todpr = vcpu->arch.sie_block->todpr;
>> + run->s.regs.pp = vcpu->arch.sie_block->pp;
>> + run->s.regs.gbea = vcpu->arch.sie_block->gbea;
>> + run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
>> if (MACHINE_HAS_GS) {
>> __ctl_set_bit(2, 4);
>> if (vcpu->arch.gs_enabled)
>> @@ -4310,39 +4315,41 @@ static void store_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> /* SIE will save etoken directly into SDNX and therefore kvm_run */
>> }
>>
>> -static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> +static void store_regs(struct kvm_vcpu *vcpu)
>> {
>> - kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
>> - kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
>> - kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
>> - memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
>> - kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
>> - kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
>> - kvm_run->s.regs.pft = vcpu->arch.pfault_token;
>> - kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
>> - kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
>> - save_access_regs(vcpu->run->s.regs.acrs);
>> + struct kvm_run *run = vcpu->run;
>> +
>> + run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
>> + run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
>> + run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
>> + memcpy(&run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
>> + run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
>> + run->s.regs.ckc = vcpu->arch.sie_block->ckc;
>> + run->s.regs.pft = vcpu->arch.pfault_token;
>> + run->s.regs.pfs = vcpu->arch.pfault_select;
>> + run->s.regs.pfc = vcpu->arch.pfault_compare;
>> + save_access_regs(run->s.regs.acrs);
>> restore_access_regs(vcpu->arch.host_acrs);
>> /* Save guest register state */
>> save_fpu_regs();
>> - vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
>> + run->s.regs.fpc = current->thread.fpu.fpc;
>> /* Restore will be done lazily at return */
>> current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
>> current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
>> if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
>> - store_regs_fmt2(vcpu, kvm_run);
>> + store_regs_fmt2(vcpu);
>> }
>>
>> int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
>> {
>> - struct kvm_run *kvm_run = vcpu->run;
>> + struct kvm_run *run = vcpu->run;
>> int rc;
>>
>> - if (kvm_run->immediate_exit)
>> + if (run->immediate_exit)
>> return -EINTR;
>>
>> - if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
>> - kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
>> + if (run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
>> + run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
>> return -EINVAL;
>>
>> vcpu_load(vcpu);
>> @@ -4368,14 +4375,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
>> goto out;
>> }
>>
>> - sync_regs(vcpu, kvm_run);
>> + sync_regs(vcpu);
>> enable_cpu_timer_accounting(vcpu);
>>
>> might_fault();
>> rc = __vcpu_run(vcpu);
>>
>> if (signal_pending(current) && !rc) {
>> - kvm_run->exit_reason = KVM_EXIT_INTR;
>> + run->exit_reason = KVM_EXIT_INTR;
>> rc = -EINTR;
>> }
>>
>> @@ -4390,7 +4397,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
>> }
>>
>> disable_cpu_timer_accounting(vcpu);
>> - store_regs(vcpu, kvm_run);
>> + store_regs(vcpu);
>>
>> kvm_sigset_deactivate(vcpu);
>>
>>
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