From: Jan Beulich <jbeulich@suse.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "Cooper, Andrew" <andrew.cooper3@citrix.com>,
"Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>,
"Ian Jackson" <iwj@xenproject.org>,
"George Dunlap" <george.dunlap@citrix.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v3 2/2] VMX: use a single, global APIC access page
Date: Mon, 1 Mar 2021 09:18:52 +0100 [thread overview]
Message-ID: <a8575678-8c62-8175-b396-159cdfee8997@suse.com> (raw)
In-Reply-To: <MWHPR11MB1886992F8E3886EC64A54B8D8C9A9@MWHPR11MB1886.namprd11.prod.outlook.com>
On 01.03.2021 03:34, Tian, Kevin wrote:
>> From: Jan Beulich <jbeulich@suse.com>
>> Sent: Monday, February 22, 2021 6:57 PM
>>
>> The address of this page is used by the CPU only to recognize when to
>> access the virtual APIC page instead. No accesses would ever go to this
>> page. It only needs to be present in the (CPU) page tables so that
>> address translation will produce its address as result for respective
>> accesses.
>>
>> By making this page global, we also eliminate the need to refcount it,
>> or to assign it to any domain in the first place.
>>
>> Signed-off-by: Jan Beulich <jbeulich@suse.com>
>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Thanks, but for the record: As said on an unrelated thread already,
I also need to make an adjustment to shadow mode code here. Since
that doesn't affect VMX code itself, I'll retain the R-b on v4
(which I intend to submit only once we have 4.15 branched).
Jan
next prev parent reply other threads:[~2021-03-01 8:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 10:55 [PATCH v3 0/2] VMX: apic access page handling adjustments Jan Beulich
2021-02-22 10:56 ` [PATCH v3 1/2][4.15] VMX: delay p2m insertion of APIC access page Jan Beulich
2021-02-22 11:25 ` Ian Jackson
2021-02-22 14:05 ` Jan Beulich
2021-02-22 17:17 ` Ian Jackson
2021-02-22 12:15 ` Roger Pau Monné
2021-02-25 8:44 ` Jan Beulich
2021-02-26 7:06 ` Tian, Kevin
2021-02-22 10:57 ` [PATCH v3 2/2] VMX: use a single, global " Jan Beulich
2021-03-01 2:34 ` Tian, Kevin
2021-03-01 8:18 ` Jan Beulich [this message]
2021-04-12 10:40 ` [PATCH v4] " Jan Beulich
2021-04-12 15:31 ` Roger Pau Monné
2021-04-13 9:24 ` Jan Beulich
2021-04-13 10:18 ` Roger Pau Monné
2021-04-13 12:03 ` Jan Beulich
2021-04-13 13:03 ` Roger Pau Monné
2021-04-17 19:24 ` Tim Deegan
2021-04-19 11:25 ` Jan Beulich
2021-04-22 7:42 ` Tim Deegan
2021-04-22 9:38 ` Jan Beulich
2021-04-22 15:05 ` Tim Deegan
2021-04-23 10:51 ` [PATCH v4 0/3] VMX APIC access page and shadow adjustments Jan Beulich
2021-04-23 10:52 ` [PATCH v4 1/3] VMX: use a single, global APIC access page Jan Beulich
2021-04-23 14:17 ` Roger Pau Monné
2021-04-23 14:42 ` Jan Beulich
2021-04-26 17:55 ` Tim Deegan
2021-04-25 1:27 ` Tian, Kevin
2021-04-26 17:53 ` Tim Deegan
2021-04-23 10:53 ` [PATCH v4 2/3] x86/shadow: re-use variables in shadow_get_page_from_l1e() Jan Beulich
2021-04-23 10:54 ` [PATCH v4 3/3] x86/shadow: streamline shadow_get_page_from_l1e() Jan Beulich
2021-04-23 11:00 ` Really v5 (was: [PATCH v4 0/3] VMX APIC access page and shadow adjustments) Jan Beulich
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