From: "Jan Beulich" <JBeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Juergen Gross <jgross@suse.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
george.dunlap@citrix.com, Paul Durrant <paul.durrant@citrix.com>,
xen-devel <xen-devel@lists.xenproject.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH 0/2] MMIO emulation fixes
Date: Thu, 16 Aug 2018 05:27:56 -0600 [thread overview]
Message-ID: <5B755FBC02000078001DEDBF@prv1-mh.provo.novell.com> (raw)
In-Reply-To: <11c0c965-9af7-2cec-1420-4541e281183a@citrix.com>
>>> On 16.08.18 at 12:56, <andrew.cooper3@citrix.com> wrote:
> On 16/08/18 11:29, Jan Beulich wrote:
>> Following some further discussion with Andrew, he looks to be
>> convinced that the issue is to be fixed in the balloon driver,
>> which so far (intentionally afaict) does not remove the direct
>> map entries for ballooned out pages in the HVM case. I'm not
>> convinced of this, but I'd nevertheless like to inquire whether
>> such a change (resulting in shattered super page mappings)
>> would be acceptable in the first place.
>
> We don't tolerate anything else in the directmap pointing to
> invalid/unimplemented frames. Why should ballooning be any different?
Because ballooning is something virtualization specific, which
doesn't have any equivalent on bare hardware (memory hot
unplug doesn't come quite close enough imo, not the least
because that doesn't work on a page granular basis). Hence
we're to define the exact behavior here, and hence such a
definition could as well include special behavior of accesses
to the involved guest-physical addresses.
Jan
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next prev parent reply other threads:[~2018-08-16 11:28 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-10 10:37 [PATCH 0/2] MMIO emulation fixes Paul Durrant
2018-08-10 10:37 ` [PATCH 1/2] x86/hvm/ioreq: MMIO range checking completely ignores direction flag Paul Durrant
2018-08-10 11:11 ` Andrew Cooper
2018-08-10 10:37 ` [PATCH 2/2] x86/hvm/emulate: make sure rep I/O emulation does not cross GFN boundaries Paul Durrant
2018-08-10 11:14 ` Andrew Cooper
2018-08-10 11:50 ` Paul Durrant
2018-08-10 11:50 ` Andrew Cooper
2018-08-10 11:59 ` Jan Beulich
2018-08-10 12:10 ` Paul Durrant
2018-08-10 12:01 ` [PATCH 0/2] MMIO emulation fixes Jan Beulich
2018-08-10 12:08 ` Paul Durrant
2018-08-10 12:13 ` Jan Beulich
2018-08-10 12:22 ` Paul Durrant
2018-08-10 12:37 ` Jan Beulich
2018-08-10 12:43 ` Paul Durrant
2018-08-10 12:55 ` Andrew Cooper
2018-08-10 15:08 ` Paul Durrant
2018-08-10 15:30 ` Jan Beulich
2018-08-10 15:35 ` Paul Durrant
[not found] ` <5B6DB69D02000078001DD06A@prv1*mh.provo.novell.com>
[not found] ` <eaab5a73*2910*7fb6*e1fc*08537e63088c@citrix.com>
[not found] ` <92ca69e5*98b1*61e4*817a*3868f829471a@citrix.com>
2018-08-10 16:00 ` Jan Beulich
2018-08-10 16:30 ` George Dunlap
2018-08-10 16:37 ` Andrew Cooper
2018-08-13 6:50 ` Jan Beulich
2018-08-16 11:08 ` Andrew Cooper
2018-08-29 10:36 ` Olaf Hering
2018-08-29 10:53 ` Andrew Cooper
2018-08-29 11:00 ` Olaf Hering
2018-08-29 11:09 ` Andrew Cooper
2018-08-29 11:14 ` Andrew Cooper
2018-08-29 11:26 ` Juergen Gross
[not found] ` <5B86773A0200004903F324A0@prv1-mh.provo.novell.com>
[not found] ` <5B867B1A0200006D03F3278E@prv1-mh.provo.novell.com>
[not found] ` <5B867D000200009103F328E2@prv1-mh.provo.novell.com>
[not found] ` <5B867F020200009E04E46402@prv1-mh.provo.novell.com>
2018-08-29 12:06 ` Jan Beulich
[not found] ` <5B87A68A0200001C04E5493A@prv1-mh.provo.novell.com>
2018-08-30 8:23 ` Jan Beulich
2018-08-30 10:42 ` Olaf Hering
2018-08-30 8:10 ` Olaf Hering
2018-08-16 10:29 ` Jan Beulich
2018-08-16 10:56 ` Andrew Cooper
2018-08-16 11:27 ` Jan Beulich [this message]
[not found] <20180810103714.5112=3def=3dbf=3dbd1=3def=3dbf=3dbdpau?= =?UTF-8?Q?l.durrant@ci=3f=3d_trix.com>
[not found] ` <fdf19f7d=ef=bf=bd1b92=ef=bf=bda9c0?= =?UTF-8?Q?=ef=bf=bd3602=ef=bf=bdb1c9807bf610@citrix.com>
[not found] ` <a735b4359ccc4b278?= =?UTF-8?Q?330204d9790c6ac@AMSPEX02CL03.citrite.net>
[not found] ` <5B6DAF9F02000078001DD0?= =?UTF-8?Q?40@prv1=ef=bf=bdmh.provo.novell.com>
[not found] ` <e2f77af0b2394b8f859a1f2dc1a?= =?UTF-8?Q?91797@AMSPEX02CL03.citrite.net>
[not found] ` <5B6DB69D02000078001DD06A@prv1?= =?UTF-8?B?77+9bWgucHJvdm8ubm92ZWxsLmNvbT4gPGVhYWI1YTcz77+9MjkxMO+/vTdmYjY=?= =?UTF-8?B?77+9ZTFmY++/vTA4NTM3ZTYzMDg4Y0BjaXRyaXguY29tPiA8OTJjYTY5ZTXvv705?= =?UTF-8?B?OGIx77+9NjFlNO+/vTgxN2Hvv70zODY4ZjgyOTQ3MWFAY2l0>
[not found] ` <11c0c96?= =?UTF-8?Q?5-9af7-2cec-1420-4541e281183a@citrix.com>
[not found] ` <5B755FBC0200007_=3d=3f?= =?UTF-8?Q?UTF-8=3fQ=3f8001DEDBF@suse.com>
[not found] ` <dd3c99c2-67e3-faf1-4219-85651b89?= =?UTF-8?Q?1adc@suse.com>
2018-09-04 16:24 ` Andrew Cooper
[not found] ` <651CBD680200008737554D14@prv1-mh.provo.novell.com>
[not found] ` <21554C83020000C537554D14@prv1-mh.provo.novell.com>
[not found] ` <06D73C83020000C037554D14@prv1-mh.provo.novell.com>
[not found] ` <A283E656020000808E2C01CD@prv1-mh.provo.novell.com>
2018-09-05 7:10 ` Jan Beulich
[not found] <20180810103714.5112=ef=bf=bd1=ef=bf=bdpaul.durrant@ci?= =?UTF-8?Q?trix.com>
[not found] ` <5B6D86F30?= =?UTF-8?Q?2000078001DCF85@prv1=ef=bf=bdmh.provo.novell.com>
[not found] ` <e8cff3ca6c154b?= =?UTF-8?Q?67a2a932af83719354@AMSPEX02CL03.citrite.net>
[not found] ` <fdf19f7d=ef=bf=bd1b?= =?UTF-8?B?OTLvv71hOWMw77+9MzYwMu+/vWIxYzk4MDdiZjYxMEBjaXRyaXguY29tPiA8YTcz?= =?UTF-8?Q?5b4359ccc4b278330204d9790c6ac@AMSPEX02CL03.citrite.net>
[not found] ` <5B6DAF9F?= =?UTF-8?Q?02000078001DD040@prv1=ef=bf=bdmh.provo.novell.com>
[not found] ` <e2f77af0b2394?= =?UTF-8?Q?b8f859a1f2dc1a91797@AMSPEX02CL03.citrite.net>
[not found] ` <5B6DB69D0200007800?= =?UTF-8?Q?1DD06A@prv1=ef=bf=bdmh.provo.novell.com>
[not found] ` <eaab5a73=ef=bf=bd2910?= =?UTF-8?B?77+9N2ZiNu+/vWUxZmPvv70wODUzN2U2MzA4OGNAY2l0cml4LmNvbT4gPDkyY2E2?= =?UTF-8?B?OWU177+9OThiMe+/vTYxZTTvv704MTdh77+9Mzg2OGY4Mjk0NzFhQGNpdHJpeC5j?= =?UTF-8?Q?om>
[not found] ` <5B75521102000078001DED13@prv1=ef=bf=bdmh.provo.novell.com>
[not found] ` <?= =?UTF-8?Q?11c0c965-9af7-2cec-1420-4541e281183a@citrix.com>
[not found] ` <5B755FBC0200007?= =?UTF-8?Q?8001DEDBF@suse.com>
2018-08-16 12:52 ` Juergen Gross
2018-09-04 16:11 ` Juergen Gross
[not found] <20180810103714.5112=3def=3dbf=3dbd1=3def=3dbf=3dbdpau?= l.durrant@ci?= trix.com>
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