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Message-ID: <45A5F616.3040305@qumranet.com> Date: Thu, 11 Jan 2007 10:32:22 +0200 From: Avi Kivity <avi@...ranet.com> To: Jeff Garzik <jeff@...zik.org> CC: Arnd Bergmann <arnd@...db.de>, kvm-devel@...ts.sourceforge.net, Andrew Morton <akpm@...l.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [kvm-devel] [RFC] Stable kvm userspace interface Jeff Garzik wrote: > Arnd Bergmann wrote: >> On Tuesday 09 January 2007 14:47, Jeff Garzik wrote: >>> Can we please avoid adding a ton of new ioctls? ioctls inevitably >>> require 64-bit compat code for certain architectures, whereas >>> sysfs/procfs does not. >> >> For performance reasons, an ascii string based interface is not >> desireable here, some of these calls should be optimized to >> the point of counting cycles. > > sysfs does not require ASCII... > The main kvm ioctl switches the execution mode to guest mode. Just like a syscall enters kernel mode, ioctl(vcpu_fd, KVM_VCPU_RUN) enters the guest address space and begins executing guest code. I don't see how to model that with sysfs. There are other objections as well. sysfs is a public interface, whereas kvm is a process private attribute. These objections don't apply to /proc though. -- error compiling committee.c: too many arguments to function - 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/
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