From: Tim Deegan <tim@xen.org>
To: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Cc: "olaf@aepfle.de" <olaf@aepfle.de>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Ian Campbell <ian.campbell@citrix.com>,
"andres@gridcentric.ca" <andres@gridcentric.ca>,
Ian Jackson <ian.jackson@eu.citrix.com>,
"keir.xen@gmail.com" <keir.xen@gmail.com>,
"adin@gridcentric.ca" <adin@gridcentric.ca>
Subject: Re: [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings
Date: Thu, 1 Mar 2012 17:32:26 +0000 [thread overview]
Message-ID: <20120301173226.GA49888@ocelot.phlegethon.org> (raw)
In-Reply-To: <5386f6530efff6dfa885941add2f1efc.squirrel@webmail.lagarcavilla.org>
At 08:30 -0800 on 01 Mar (1330590637), Andres Lagar-Cavilla wrote:
> > At 07:47 +0000 on 01 Mar (1330588073), Ian Campbell wrote:
> >> > > Is there no scope for making these pages owned by the domain but not
> >> > > actually part of the P2M? We can cope with that for other types of
> >> magic
> >> > > page, can't we?
> >
> > It would need a new operation to map the ring into the tool that uses
> > it; normal map-foreign-page ops need a GFN.
>
> Actually, confirmed: we can call xc_domain_decrease_reservation on the
> ring after it's mapped by the helper. Guest won't get at it. Nothing
> breaks.
But that would only work if:
- the helper always attaches before the guest gets to run; and
- you never need to restart the helper.
Tim.
next prev parent reply other threads:[~2012-03-01 17:32 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-23 6:05 [PATCH 0 of 7] Mem event ring setup interface update Andres Lagar-Cavilla
2012-02-23 6:05 ` [PATCH 1 of 7] Tools: Sanitize mem_event/access/paging interfaces Andres Lagar-Cavilla
2012-02-23 14:29 ` Olaf Hering
2012-02-28 12:56 ` Ian Campbell
2012-02-28 15:14 ` Andres Lagar-Cavilla
2012-02-23 6:05 ` [PATCH 2 of 7] x86/hvm: refactor calls to prepare and tear down a helper ring Andres Lagar-Cavilla
2012-02-23 6:05 ` [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings Andres Lagar-Cavilla
2012-02-28 13:01 ` Ian Campbell
2012-02-28 15:19 ` Andres Lagar-Cavilla
2012-03-01 7:47 ` Ian Campbell
2012-03-01 15:17 ` Tim Deegan
2012-03-01 16:26 ` Andres Lagar-Cavilla
2012-03-01 16:30 ` Andres Lagar-Cavilla
2012-03-01 17:32 ` Tim Deegan [this message]
2012-03-01 17:44 ` Andres Lagar-Cavilla
2012-03-01 17:52 ` [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event ringsg Tim Deegan
2012-03-06 19:27 ` Andres Lagar-Cavilla
2012-03-01 2:29 ` [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings Andres Lagar-Cavilla
2012-02-23 6:05 ` [PATCH 4 of 7] x86/mm: wire up sharing ring Andres Lagar-Cavilla
2012-02-23 6:05 ` [PATCH 5 of 7] Tools: libxc side for setting up the mem " Andres Lagar-Cavilla
2012-02-28 13:02 ` Ian Campbell
2012-02-23 6:05 ` [PATCH 6 of 7] x86/mm: Clean up mem event structures on domain destruction Andres Lagar-Cavilla
2012-02-23 14:32 ` Olaf Hering
2012-02-23 6:05 ` [PATCH 7 of 7] x86/mm: Fix mem event error message typos Andres Lagar-Cavilla
2012-02-23 16:07 ` [PATCH 0 of 7] Mem event ring setup interface update Tim Deegan
2012-02-27 22:43 ` Andres Lagar-Cavilla
-- strict thread matches above, loose matches on Subject: below --
2012-03-01 2:43 [PATCH 0 of 7] Mem event ring interface setup update, V2 Andres Lagar-Cavilla
2012-03-01 2:43 ` [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings Andres Lagar-Cavilla
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