From: "Michał Leszczyński" <michal.leszczynski@cert.pl>
To: Julien Grall <julien@xen.org>
Cc: "Kevin Tian" <kevin.tian@intel.com>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"tamas lengyel" <tamas.lengyel@intel.com>,
"Jan Beulich" <jbeulich@suse.com>, "Wei Liu" <wl@xen.org>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Ian Jackson" <ian.jackson@eu.citrix.com>,
"George Dunlap" <george.dunlap@citrix.com>,
"Jun Nakajima" <jun.nakajima@intel.com>,
xen-devel@lists.xenproject.org,
"luwei kang" <luwei.kang@intel.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [PATCH v4 02/10] x86/vmx: add IPT cpu feature
Date: Sat, 4 Jul 2020 21:16:03 +0200 (CEST) [thread overview]
Message-ID: <271632089.19642398.1593890163210.JavaMail.zimbra@cert.pl> (raw)
In-Reply-To: <2e01fca9-efcd-7d09-355f-29245bbc8721@xen.org>
----- 3 lip 2020 o 9:58, Julien Grall julien@xen.org napisał(a):
> Hi,
>
> On 02/07/2020 21:28, Michał Leszczyński wrote:
>> ----- 2 lip 2020 o 16:31, Julien Grall julien@xen.org napisał(a):
>>
>>> On 02/07/2020 15:17, Jan Beulich wrote:
>>>> On 02.07.2020 16:14, Julien Grall wrote:
>>>>> On 02/07/2020 14:30, Jan Beulich wrote:
>>>>>> On 02.07.2020 11:57, Julien Grall wrote:
>>>>>>> On 02/07/2020 10:18, Jan Beulich wrote:
>>>>>>>> On 02.07.2020 10:54, Julien Grall wrote:
>>>>>>>>> On 02/07/2020 09:50, Jan Beulich wrote:
>>>>>>>>>> On 02.07.2020 10:42, Julien Grall wrote:
>>>>>>>>>>> On 02/07/2020 09:29, Jan Beulich wrote:
>>>>>>> Another way to do it, would be the toolstack to do the mapping. At which
>>>>>>> point, you still need an hypercall to do the mapping (probably the
>>>>>>> hypercall acquire).
>>>>>>
>>>>>> There may not be any mapping to do in such a contrived, fixed-range
>>>>>> environment. This scenario was specifically to demonstrate that the
>>>>>> way the mapping gets done may be arch-specific (here: a no-op)
>>>>>> despite the allocation not being so.
>>>>> You are arguing on extreme cases which I don't think is really helpful
>>>>> here. Yes if you want to map at a fixed address in a guest you may not
>>>>> need the acquire hypercall. But in most of the other cases (see has for
>>>>> the tools) you will need it.
>>>>>
>>>>> So what's the problem with requesting to have the acquire hypercall
>>>>> implemented in common code?
>>>>
>>>> Didn't we start out by you asking that there be as little common code
>>>> as possible for the time being?
>>>
>>> Well as I said I am not in favor of having the allocation in common
>>> code, but if you want to keep it then you also want to implement
>>> map/unmap in the common code ([1], [2]).
>>>
>>>> I have no issue with putting the
>>>> acquire implementation there ...
>>> This was definitely not clear given how you argued with extreme cases...
>>>
>>> Cheers,
>>>
>>> [1] <9a3f4d58-e5ad-c7a1-6c5f-42aa92101ca1@xen.org>
>>> [2] <cf41855b-9e5e-13f2-9ab0-04b98f8b3cdd@xen.org>
>>>
>>> --
>>> Julien Grall
>>
>>
>> Guys,
>>
>> could you express your final decision on this topic?
>
> Can you move the acquire implementation from x86 to common code?
>
> Cheers,
>
> --
> Julien Grall
Ok, sure. This will be done within the patch v5.
Best regards,
Michał Leszczyński
CERT Polska
next prev parent reply other threads:[~2020-07-04 19:17 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 12:33 [PATCH v4 00/10] Implement support for external IPT monitoring Michał Leszczyński
2020-06-30 12:33 ` [PATCH v4 01/10] x86/vmx: add Intel PT MSR definitions Michał Leszczyński
2020-06-30 16:23 ` Jan Beulich
2020-06-30 17:37 ` Andrew Cooper
2020-06-30 18:03 ` Tamas K Lengyel
2020-06-30 18:27 ` Michał Leszczyński
2020-07-01 17:52 ` Andrew Cooper
2020-06-30 12:33 ` [PATCH v4 02/10] x86/vmx: add IPT cpu feature Michał Leszczyński
2020-07-01 9:49 ` Roger Pau Monné
2020-07-01 15:12 ` Julien Grall
2020-07-01 16:06 ` Andrew Cooper
2020-07-01 16:17 ` Julien Grall
2020-07-01 16:18 ` Julien Grall
2020-07-01 17:26 ` Andrew Cooper
2020-07-01 18:02 ` Julien Grall
2020-07-01 18:06 ` Andrew Cooper
2020-07-01 18:09 ` Julien Grall
2020-07-02 8:29 ` Jan Beulich
2020-07-02 8:42 ` Julien Grall
2020-07-02 8:50 ` Jan Beulich
2020-07-02 8:54 ` Julien Grall
2020-07-02 9:18 ` Jan Beulich
2020-07-02 9:57 ` Julien Grall
2020-07-02 13:30 ` Jan Beulich
2020-07-02 14:14 ` Julien Grall
2020-07-02 14:17 ` Jan Beulich
2020-07-02 14:31 ` Julien Grall
2020-07-02 20:28 ` Michał Leszczyński
2020-07-03 7:58 ` Julien Grall
2020-07-04 19:16 ` Michał Leszczyński [this message]
2020-07-01 21:42 ` Andrew Cooper
2020-07-02 8:10 ` Roger Pau Monné
2020-07-02 8:34 ` Jan Beulich
2020-07-02 20:29 ` Michał Leszczyński
2020-06-30 12:33 ` [PATCH v4 03/10] tools/libxl: add vmtrace_pt_size parameter Michał Leszczyński
2020-07-01 10:05 ` Roger Pau Monné
2020-07-02 9:00 ` Roger Pau Monné
2020-07-02 16:23 ` Michał Leszczyński
2020-07-03 9:44 ` Roger Pau Monné
2020-07-03 9:56 ` Jan Beulich
2020-07-03 10:11 ` Roger Pau Monné
2020-07-04 17:23 ` Julien Grall
2020-07-06 8:46 ` Jan Beulich
2020-07-07 8:44 ` Julien Grall
2020-07-07 9:10 ` Jan Beulich
2020-07-07 9:16 ` Julien Grall
2020-07-07 11:17 ` Michał Leszczyński
2020-07-07 11:21 ` Jan Beulich
2020-07-07 11:35 ` Michał Leszczyński
2020-07-02 10:24 ` Anthony PERARD
2020-07-04 17:48 ` Julien Grall
2020-06-30 12:33 ` [PATCH v4 04/10] x86/vmx: implement processor tracing for VMX Michał Leszczyński
2020-07-01 10:30 ` Roger Pau Monné
2020-06-30 12:33 ` [PATCH v4 05/10] common/domain: allocate vmtrace_pt_buffer Michał Leszczyński
2020-07-01 10:38 ` Roger Pau Monné
2020-07-01 15:35 ` Julien Grall
2020-06-30 12:33 ` [PATCH v4 06/10] memory: batch processing in acquire_resource() Michał Leszczyński
2020-07-01 10:46 ` Roger Pau Monné
2020-07-03 10:35 ` Julien Grall
2020-07-03 10:52 ` Paul Durrant
2020-07-03 11:17 ` Julien Grall
2020-07-03 11:22 ` Jan Beulich
2020-07-03 11:36 ` Julien Grall
2020-07-03 12:50 ` Jan Beulich
2020-07-03 11:40 ` Paul Durrant
2020-06-30 12:33 ` [PATCH v4 07/10] x86/mm: add vmtrace_buf resource type Michał Leszczyński
2020-07-01 10:52 ` Roger Pau Monné
2020-06-30 12:33 ` [PATCH v4 08/10] x86/domctl: add XEN_DOMCTL_vmtrace_op Michał Leszczyński
2020-07-01 11:00 ` Roger Pau Monné
2020-06-30 12:33 ` [PATCH v4 09/10] tools/libxc: add xc_vmtrace_* functions Michał Leszczyński
2020-07-21 10:52 ` Wei Liu
2020-06-30 12:33 ` [PATCH v4 10/10] tools/proctrace: add proctrace tool Michał Leszczyński
2020-07-02 15:10 ` Andrew Cooper
2020-07-21 10:52 ` Wei Liu
2020-06-30 12:48 ` [PATCH v4 00/10] Implement support for external IPT monitoring Hubert Jasudowicz
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