From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Sheng Yang <sheng@linux.intel.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 2/3] KVM: Emulate MSI-X table in kernel
Date: Mon, 17 Jan 2011 18:01:04 +0200 [thread overview]
Message-ID: <4D3467C0.4000306@redhat.com> (raw)
In-Reply-To: <20110117155254.GA12350@amt.cnet>
On 01/17/2011 05:52 PM, Marcelo Tosatti wrote:
> >
> > What a value is written by the guest, which kvm cannot handle itself
> > (i.e. a change to anything other than the mask bit), we exit with
> > the table and entry ids, so userspace can reread them.
>
> OK. But regarding access to the MSI-X entry in userspace, it can
> only be accessed safely wrt parallel updates by the kernel in the
> exit handler.
>
> Is the exit handler the only location where the MSI-X entry will be
> read or written to, in userspace?
>
Yes. This should be documented, that the kernel owns the msix area as
far as writes are concerned.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-01-17 16:01 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 10:19 [PATCH 0/3 v7] MSI-X MMIO support for KVM Sheng Yang
2011-01-06 10:19 ` [PATCH 1/3] KVM: Move struct kvm_io_device to kvm_host.h Sheng Yang
2011-01-06 10:19 ` [PATCH 2/3] KVM: Emulate MSI-X table in kernel Sheng Yang
2011-01-17 11:54 ` Marcelo Tosatti
2011-01-17 12:18 ` Sheng Yang
2011-01-17 12:18 ` Avi Kivity
2011-01-17 12:48 ` Marcelo Tosatti
2011-01-17 12:51 ` Avi Kivity
2011-01-17 15:52 ` Marcelo Tosatti
2011-01-17 16:01 ` Avi Kivity [this message]
2011-01-17 12:39 ` Marcelo Tosatti
2011-01-19 8:37 ` Sheng Yang
2011-01-17 12:29 ` Avi Kivity
2011-01-17 13:31 ` Michael S. Tsirkin
2011-01-17 13:47 ` Jan Kiszka
2011-01-30 4:38 ` Sheng Yang
2011-01-31 13:09 ` Avi Kivity
2011-02-01 4:21 ` Sheng Yang
2011-01-06 10:19 ` [PATCH 3/3] KVM: Add documents for MSI-X MMIO API Sheng Yang
2011-01-17 12:21 ` Avi Kivity
2011-01-17 12:35 ` Sheng Yang
2011-01-17 12:45 ` Avi Kivity
2011-01-19 8:21 ` Sheng Yang
2011-01-25 12:47 ` Avi Kivity
2011-01-26 9:05 ` Sheng Yang
2011-01-31 13:24 ` Avi Kivity
2011-02-01 4:26 ` Sheng Yang
2011-01-12 2:23 ` [PATCH 0/3 v7] MSI-X MMIO support for KVM Sheng Yang
-- strict thread matches above, loose matches on Subject: below --
2011-01-30 5:11 [PATCH 0/3 v8] " Sheng Yang
2011-01-30 5:11 ` [PATCH 2/3] KVM: Emulate MSI-X table in kernel Sheng Yang
2011-02-03 1:05 ` Marcelo Tosatti
2011-02-18 8:15 ` Sheng Yang
2011-02-22 17:58 ` Marcelo Tosatti
2011-02-23 0:19 ` Alex Williamson
2011-02-23 6:59 ` Sheng Yang
2011-02-23 8:45 ` Michael S. Tsirkin
2011-02-24 8:08 ` Sheng Yang
2011-02-24 10:11 ` Michael S. Tsirkin
2011-02-25 5:54 ` Sheng Yang
2011-02-24 9:44 ` Sheng Yang
2011-02-24 10:17 ` Michael S. Tsirkin
2011-02-25 6:12 ` Sheng Yang
2011-02-25 8:46 ` Michael S. Tsirkin
2011-02-23 16:34 ` Alex Williamson
2011-02-23 18:39 ` Michael S. Tsirkin
2011-02-23 19:02 ` Alex Williamson
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