From: Paolo Bonzini <pbonzini@redhat.com>
To: "Radim Krčmář" <rkrcmar@redhat.com>, linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit
Date: Wed, 5 Aug 2015 15:29:54 +0200 [thread overview]
Message-ID: <55C20FD2.8020607@redhat.com> (raw)
In-Reply-To: <1438780877-31838-4-git-send-email-rkrcmar@redhat.com>
On 05/08/2015 15:21, Radim Krčmář wrote:
> + kvm_for_each_vcpu(idx, vcpu, kvm)
> + if (vcpu->vcpu_id == vcpu_id) {
> + kvm_make_request(KVM_REQ_EXIT, vcpu);
> + kvm_vcpu_kick(vcpu);
> +
> + return 0;
> + }
> +
Why not a vcpu ioctl? kvm_for_each_vcpu can become pretty expensive if
you have a few dozen VCPUs.
Paolo
next prev parent reply other threads:[~2015-08-05 13:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-05 13:21 [PATCH 0/5] KVM: optimize userspace exits with a new ioctl Radim Krčmář
2015-08-05 13:21 ` [PATCH 1/5] KVM: add kvm_has_request wrapper Radim Krčmář
2015-08-05 13:21 ` [PATCH 2/5] KVM: add KVM_REQ_EXIT request for userspace exit Radim Krčmář
2015-08-05 13:21 ` [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl " Radim Krčmář
2015-08-05 13:29 ` Paolo Bonzini [this message]
2015-08-05 13:34 ` Radim Krčmář
2015-08-05 13:38 ` Paolo Bonzini
2015-08-05 13:48 ` Radim Krčmář
2015-08-05 13:21 ` [PATCH 4/5] KVM: optimize common cases in KVM_USER_EXIT Radim Krčmář
2015-08-05 13:21 ` [PATCH 5/5] KVM: x86: add request_exits debug counter Radim Krčmář
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