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2024 17:15:52 +0000 From: "Felix Polyudov via groups.io" To: "Ni, Ray" , Laszlo Ersek , "devel@edk2.groups.io" , "Liu, Zhiguang" CC: Liming Gao , "Wu, Jiaxin" Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Support to unregister SMI handler inside SMI handler Thread-Topic: [EXTERNAL] Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Support to unregister SMI handler inside SMI handler Thread-Index: AQHaTsYhU0a4YevwqUGwzLn/cW0rJLDpJBkAgAAJ71A= Date: Wed, 24 Jan 2024 17:15:52 +0000 Message-ID: References: <20240124040301.2176-1-zhiguang.liu@intel.com> <9aa1a85d-89c0-6c7b-0174-184791d75bcd@redhat.com> In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: BN0PR10MB4981:EE_|SJ0PR10MB4415:EE_ x-ms-office365-filtering-correlation-id: d14363f1-f53b-4519-64e7-08dc1d001e1a x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam-message-info: 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X-MS-Exchange-CrossTenant-Network-Message-Id: d14363f1-f53b-4519-64e7-08dc1d001e1a X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2024 17:15:52.1731 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 27e97857-e15f-486c-b58e-86c2b3040f93 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9cJC1ApGGSBFCuehL3rJGBjgT8d86u6Gu5VRCqwGoW1cVmYPmPijDgPqN3saYoPs X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB4415 Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,felixp@ami.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: awTWRICQDJlGqbkz0WK5M2xex7686176AA= Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_BN0PR10MB49815C3315E8BBB9347D120ADE7B2BN0PR10MB4981namp_" X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=lzUkbCNG; spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io; dmarc=none; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") --_000_BN0PR10MB49815C3315E8BBB9347D120ADE7B2BN0PR10MB4981namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable In my opinion this is not a spec conformance fix, but it is a bug fix. The spec does not explicitly mentions unregistering from within the handler= , but by applying a principle that everything that's not forbidden is legal, it's fair for a caller to expect that unregistering works fine in any valid= context including from within the MM handler. The spec does mention that UEFI/PI interfaces are not reentrant, however, reentrancy typically implies repetitive invocation of the same int= erface, not a call to one MM Core interface while another MM Core interface is in p= rogress. From: Ni, Ray Sent: Wednesday, January 24, 2024 11:17 AM To: Laszlo Ersek ; devel@edk2.groups.io; Liu, Zhiguang <= zhiguang.liu@intel.com> Cc: Liming Gao ; Wu, Jiaxin = ; Felix Polyudov Subject: [EXTERNAL] Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Support to u= nregister SMI handler inside SMI handler **CAUTION: The e-mail below is from an external source. Please exercise cau= tion before opening attachments, clicking links, or following guidance.** spec does not say the unregistration is allowed inside handler. it's just t= o improve the qualiquali the code. thanks, ray ________________________________ From: Laszlo Ersek > Sent: Wednesday, January 24, 2024 9:06:13 PM To: devel@edk2.groups.io >; Ni, Ray >; Liu, Zhiguang > Cc: Liming Gao >;= Wu, Jiaxin >; POLUDOV, FEL= IX > Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Support to unregister S= MI handler inside SMI handler On 1/24/24 09:11, Ni, Ray wrote: > Felix, I remember you mentioned to me about the usage of SMI handler unre= gistering itself. I wanted to ask: is this something that the PI spec comments on? I.e., is this usage expected by the spec (in which case this bugfix is a conformance fix), or is the spec silent on it (in which case I guess we can call this a quality-of-implementation improvement)? > > Reviewed-by: Ray Ni > Reviewed-by: Laszlo Ersek > Thanks Laszlo > > Thanks, > Ray >> -----Original Message----- >> From: Liu, Zhiguang > >> Sent: Wednesday, January 24, 2024 12:03 PM >> To: devel@edk2.groups.io >> Cc: Liu, Zhiguang = >; Liming Gao >> >; Wu, Jiaxin = >; Ni, Ray >> > >> Subject: [PATCH] MdeModulePkg/SMM: Support to unregister SMI handler >> inside SMI handler >> >> To support unregister SMI handler inside SMI handler itself, >> get next node before SMI handler is executed, since LIST_ENTRY that >> Link points to may be freed if unregister SMI handler in SMI handler >> itself. >> >> Cc: Liming Gao > >> Cc: Jiaxin Wu > >> Cc: Ray Ni > >> Signed-off-by: Zhiguang Liu > >> --- >> MdeModulePkg/Core/PiSmmCore/Smi.c | 8 +++++++- >> 1 file changed, 7 insertions(+), 1 deletion(-) >> >> diff --git a/MdeModulePkg/Core/PiSmmCore/Smi.c >> b/MdeModulePkg/Core/PiSmmCore/Smi.c >> index 2985f989c3..a75e52b1ae 100644 >> --- a/MdeModulePkg/Core/PiSmmCore/Smi.c >> +++ b/MdeModulePkg/Core/PiSmmCore/Smi.c >> @@ -134,8 +134,14 @@ SmiManage ( >> >> Head =3D &SmiEntry->SmiHandlers; >> >> - for (Link =3D Head->ForwardLink; Link !=3D Head; Link =3D Link->Forwa= rdLink) { >> + for (Link =3D Head->ForwardLink; Link !=3D Head;) { >> SmiHandler =3D CR (Link, SMI_HANDLER, Link, >> SMI_HANDLER_SIGNATURE); >> + // >> + // To support unregiser SMI handler inside SMI handler itself, >> + // get next node before handler is executed, since LIST_ENTRY that >> + // Link points to may be freed if unregister SMI handler. >> + // >> + Link =3D Link->ForwardLink; >> >> Status =3D SmiHandler->Handler ( >> (EFI_HANDLE)SmiHandler, >> -- >> 2.31.1.windows.1 > > > >=20 > > -The information contained in this message may be confidential and propriet= ary to American Megatrends (AMI). This communication is intended to be read= only by the individual or entity to whom it is addressed or by their desig= nee. If the reader of this message is not the intended recipient, you are o= n notice that any distribution of this message, in any form, is strictly pr= ohibited. Please promptly notify the sender by reply e-mail or by telephone= at 770-246-8600, and then delete or destroy all copies of the transmission= . -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#114340): https://edk2.groups.io/g/devel/message/114340 Mute This Topic: https://groups.io/mt/103925794/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- --_000_BN0PR10MB49815C3315E8BBB9347D120ADE7B2BN0PR10MB4981namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

In my opinion this is not a spec conformance fix, b= ut it is a bug fix.

The spec does not e= xplicitly mentions unregistering from within the handler,=

but by applying a p= rinciple that everything that’s not forbidden is legal,

it’s fair for= a caller to expect that unregistering works fine in any valid context=

including from with= in the MM handler.

 

The spec does menti= on that UEFI/PI interfaces are not reentrant,

however, reentrancy= typically implies repetitive invocation of the same interface,

not a call to one M= M Core interface while another MM Core interface is in progress.

 

From: Ni, Ray <ray.ni@intel.com&g= t;
Sent: Wednesday, January 24, 2024 11:17 AM
To: Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io; Li= u, Zhiguang <zhiguang.liu@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>; Wu, Jiaxin <jiax= in.wu@intel.com>; Felix Polyudov <Felixp@ami.com>
Subject: [EXTERNAL] Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Suppo= rt to unregister SMI handler inside SMI handler

 

 

**CAUTION: The e-mail below is from an external source. Please exerc= ise caution before opening attachments, clicking links, or following guidance.**

spec does not say the unregistration is allowed insi= de handler. it's just to improve the qualiquali the code.

 

thanks,

ray

From: Laszlo= Ersek <lersek@redhat.com> Sent: Wednesday, January 24, 2024 9:06:13 PM
To: devel@edk2.groups.io= <devel@edk2.groups.io>; = Ni, Ray <ray.ni@intel.com>; L= iu, Zhiguang <zhiguang.liu@int= el.com>
Cc: Liming Gao <gaoli= ming@byosoft.com.cn>; Wu, Jiaxin <jiaxin.wu@intel.com>; POLUDOV, FELIX <felixp@ami.com>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/SMM: Support to unreg= ister SMI handler inside SMI handler

 

On 1/24/24 09:11, Ni, Ray wrote:
> Felix, I remember you mentioned to me about the usage of SMI handler u= nregistering itself.

I wanted to ask: is this something that the PI spec comments on? I.e.,
is this usage expected by the spec (in which case this bugfix is a
conformance fix), or is the spec silent on it (in which case I guess we
can call this a quality-of-implementation improvement)?

>
> Reviewed-by: Ray Ni <ray.ni@int= el.com>

Reviewed-by: Laszlo Ersek <lersek@r= edhat.com>

Thanks
Laszlo

>
> Thanks,
> Ray
>> -----Original Message-----
>> From: Liu, Zhiguang <= zhiguang.liu@intel.com>
>> Sent: Wednesday, January 24, 2024 12:03 PM
>> To: devel@edk2.groups.io
>> Cc: Liu, Zhiguang <zh= iguang.liu@intel.com>; Liming Gao
>> <gaoliming@byosoft.= com.cn>; Wu, Jiaxin <jiaxi= n.wu@intel.com>; Ni, Ray
>> <ray.ni@intel.com> >> Subject: [PATCH] MdeModulePkg/SMM: Support to unregister SMI handl= er
>> inside SMI handler
>>
>> To support unregister SMI handler inside SMI handler itself,
>> get next node before SMI handler is executed, since LIST_ENTRY tha= t
>> Link points to may be freed if unregister SMI handler in SMI handl= er
>> itself.
>>
>> Cc: Liming Gao <gao= liming@byosoft.com.cn>
>> Cc: Jiaxin Wu <jiaxin.wu= @intel.com>
>> Cc: Ray Ni <ray.ni@intel.co= m>
>> Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
>> ---
>>  MdeModulePkg/Core/PiSmmCore/Smi.c | 8 +++++++-
>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/MdeModulePkg/Core/PiSmmCore/Smi.c
>> b/MdeModulePkg/Core/PiSmmCore/Smi.c
>> index 2985f989c3..a75e52b1ae 100644
>> --- a/MdeModulePkg/Core/PiSmmCore/Smi.c
>> +++ b/MdeModulePkg/Core/PiSmmCore/Smi.c
>> @@ -134,8 +134,14 @@ SmiManage (
>>
>>    Head =3D &SmiEntry->SmiHandlers;
>>
>> -  for (Link =3D Head->ForwardLink; Link !=3D Head; Link = =3D Link->ForwardLink) {
>> +  for (Link =3D Head->ForwardLink; Link !=3D Head;) {
>>      SmiHandler =3D CR (Link, SMI_HANDLER= , Link,
>> SMI_HANDLER_SIGNATURE);
>> +    //
>> +    // To support unregiser SMI handler inside SMI= handler itself,
>> +    // get next node before handler is executed, s= ince LIST_ENTRY that
>> +    // Link points to may be freed if unregister S= MI handler.
>> +    //
>> +    Link =3D Link->ForwardLink;
>>
>>      Status =3D SmiHandler->Handler (<= br> >>           &= nbsp;           &nbs= p;     (EFI_HANDLE)SmiHandler,
>> --
>> 2.31.1.windows.1
>
>
>
>
>
>

-The information contained in this message may be confidential and propriet= ary to American Megatrends (AMI). This communication is intended to be read= only by the individual or entity to whom it is addressed or by their desig= nee. If the reader of this message is not the intended recipient, you are on notice that any distribution of = this message, in any form, is strictly prohibited. Please promptly notify t= he sender by reply e-mail or by telephone at 770-246-8600, and then delete = or destroy all copies of the transmission.
_._,_._,_
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