From: Hollis Blanchard <hollis@penguinppc.org>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: [kvm-devel] [PATCH 01/15] KVM: Use a shared page for kernel/user communication when runing a vcpu
Date: Wed, 14 Mar 2007 22:09:23 -0500 [thread overview]
Message-ID: <1173928163.4611.13.camel@diesel> (raw)
In-Reply-To: <1173926306.4611.6.camel@diesel>
On Wed, 2007-03-14 at 21:38 -0500, Hollis Blanchard wrote:
> On Sun, 2007-03-11 at 15:53 +0200, Avi Kivity wrote:
> > Instead of passing a 'struct kvm_run' back and forth between the
> > kernel and userspace, allocate a page and allow the user to mmap() it.
> > This reduces needless copying and makes the interface expandable by
> > providing lots of free space.
>
> Do you provide for another means of accessing guest memory from host
> userspace? For example, how do you attach a host debugger to the guest?
>
> Xen uses an ioctl followed by mmap for this purpose, which is why I
> wonder about using mmap(/dev/kvm) for another purpose.
Never mind: I see now that you have separate device nodes for the VM vs
each vcpu.
-Hollis
next prev parent reply other threads:[~2007-03-15 3:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-11 13:53 [PATCH 0/15] KVM userspace interface updates Avi Kivity
[not found] ` <11736212072915-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-11 13:53 ` [PATCH 01/15] KVM: Use a shared page for kernel/user communication when runing a vcpu Avi Kivity
[not found] ` <1173621207773-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-15 2:38 ` Hollis Blanchard
2007-03-15 3:09 ` Hollis Blanchard [this message]
2007-03-11 13:53 ` [PATCH 02/15] KVM: Do not communicate to userspace through cpu registers during PIO Avi Kivity
2007-03-11 13:53 ` [PATCH 03/15] KVM: Initialize PIO I/O count Avi Kivity
2007-03-11 13:53 ` [PATCH 04/15] KVM: Handle cpuid in the kernel instead of punting to userspace Avi Kivity
2007-03-11 13:53 ` [PATCH 05/15] KVM: Remove the 'emulated' field from the userspace interface Avi Kivity
2007-03-11 13:53 ` [PATCH 06/15] KVM: Remove minor wart from KVM_CREATE_VCPU ioctl Avi Kivity
2007-03-11 13:53 ` [PATCH 07/15] KVM: Renumber ioctls Avi Kivity
2007-03-11 13:53 ` [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions Avi Kivity
2007-03-16 15:06 ` [kvm-devel] " Heiko Carstens
[not found] ` <20070316150622.GC8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-18 8:20 ` Avi Kivity
2007-03-11 13:53 ` [PATCH 09/15] KVM: Allow userspace to process hypercalls which have no kernel handler Avi Kivity
2007-03-11 13:53 ` [PATCH 10/15] KVM: Fold kvm_run::exit_type into kvm_run::exit_reason Avi Kivity
2007-03-11 13:53 ` [PATCH 11/15] KVM: Add a special exit reason when exiting due to an interrupt Avi Kivity
2007-03-11 13:53 ` [PATCH 12/15] KVM: Initialize the apic_base msr on svm too Avi Kivity
2007-03-11 13:53 ` [PATCH 13/15] KVM: Add guest mode signal mask Avi Kivity
2007-03-11 13:53 ` [PATCH 14/15] KVM: Allow kernel to select size of mmap() buffer Avi Kivity
2007-03-11 13:53 ` [PATCH 15/15] KVM: Future-proof argument-less ioctls Avi Kivity
2007-03-16 8:36 ` [PATCH 0/15] KVM userspace interface updates Heiko Carstens
2007-03-16 14:03 ` [kvm-devel] " Anthony Liguori
2007-03-16 15:01 ` Heiko Carstens
2007-03-18 10:42 ` Avi Kivity
[not found] ` <45FD1778.6030602-7k6+44Jx4zn6gbPvEgmw2w@public.gmane.org>
2007-03-19 15:43 ` Heiko Carstens
[not found] ` <20070319154311.GB8331-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-19 16:02 ` Avi Kivity
2007-03-19 16:37 ` [kvm-devel] " Heiko Carstens
[not found] ` <45FEB431.8030504-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-19 17:49 ` Avi Kivity
[not found] ` <20070316083650.GA8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-18 5:20 ` Avi Kivity
[not found] ` <45FCCC39.7090104-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-18 10:22 ` Heiko Carstens
2007-03-18 10:32 ` [kvm-devel] " Avi Kivity
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