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Date: Mon, 20 Apr 2020 09:07:59 +0200
From: Christian Borntraeger <borntraeger@...ibm.com>
To: 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,
frankja@...ux.ibm.com, 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 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.
> 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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