linux-kernel - Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 5 Aug 2015 15:29:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit



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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/