Messages in this thread | | | Date | Mon, 13 Apr 2020 09:56:17 +0100 | From | Marc Zyngier <> | Subject | Re: [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function |
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Tianjia,
On 2020-04-13 04:45, Tianjia Zhang wrote: > kvm_arch_vcpu_ioctl_run() is only called in the file kvm_main.c, > where vcpu->run is the kvm_run parameter, so it has been replaced. > > Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> > --- > arch/x86/kvm/x86.c | 8 ++++---- > virt/kvm/arm/arm.c | 2 +- > 2 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 3bf2ecafd027..70e3f4abbd4d 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -8726,18 +8726,18 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu > *vcpu, struct kvm_run *kvm_run) > r = -EAGAIN; > if (signal_pending(current)) { > r = -EINTR; > - vcpu->run->exit_reason = KVM_EXIT_INTR; > + kvm_run->exit_reason = KVM_EXIT_INTR; > ++vcpu->stat.signal_exits; > } > goto out; > } > > - if (vcpu->run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { > + if (kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { > r = -EINVAL; > goto out; > } > > - if (vcpu->run->kvm_dirty_regs) { > + if (kvm_run->kvm_dirty_regs) { > r = sync_regs(vcpu); > if (r != 0) > goto out; > @@ -8767,7 +8767,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu > *vcpu, struct kvm_run *kvm_run) > > out: > kvm_put_guest_fpu(vcpu); > - if (vcpu->run->kvm_valid_regs) > + if (kvm_run->kvm_valid_regs) > store_regs(vcpu); > post_kvm_run_save(vcpu); > kvm_sigset_deactivate(vcpu); > diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c > index 48d0ec44ad77..ab9d7966a4c8 100644 > --- a/virt/kvm/arm/arm.c > +++ b/virt/kvm/arm/arm.c > @@ -659,7 +659,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, > struct kvm_run *run) > return ret; > > if (run->exit_reason == KVM_EXIT_MMIO) { > - ret = kvm_handle_mmio_return(vcpu, vcpu->run); > + ret = kvm_handle_mmio_return(vcpu, run); > if (ret) > return ret; > }
Do you have any number supporting the idea that you are optimizing anything here? Performance, code size, register pressure or any other relevant metric?
Thanks,
M. -- Jazz is not dead. It just smells funny...
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