From: Marc Zyngier <maz@kernel.org>
To: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Cc: pbonzini@redhat.com, sean.j.christopherson@intel.com,
vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com,
joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, x86@kernel.org, hpa@zytor.com, james.morse@arm.com,
julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com,
kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function
Date: Mon, 13 Apr 2020 09:56:17 +0100 [thread overview]
Message-ID: <17097df45c7fe76ee3c09ac180b844d2@kernel.org> (raw)
In-Reply-To: <20200413034523.110548-1-tianjia.zhang@linux.alibaba.com>
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...
next prev parent reply other threads:[~2020-04-13 8:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-13 3:45 [PATCH] KVM: Optimize kvm_arch_vcpu_ioctl_run function Tianjia Zhang
2020-04-13 8:56 ` Marc Zyngier [this message]
2020-04-13 9:07 ` Tianjia Zhang
2020-04-14 14:26 ` Vitaly Kuznetsov
2020-04-15 2:19 ` Tianjia Zhang
2020-04-15 9:07 ` Vitaly Kuznetsov
2020-04-15 14:53 ` Paolo Bonzini
2020-04-16 2:00 ` Tianjia Zhang
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