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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,ray.ni@intel.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: NofiyDvwKMrGzlpl9Z6mDnL5x7686176AA= Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_MN6PR11MB8244C556A2DC7D969674B8018C7B2MN6PR11MB8244namp_" X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=l6RAukxC; 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=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=intel.com (policy=none); arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") --_000_MN6PR11MB8244C556A2DC7D969674B8018C7B2MN6PR11MB8244namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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, FELIX 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 > > -=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 (#114317): https://edk2.groups.io/g/devel/message/114317 Mute This Topic: https://groups.io/mt/103925794/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/leave/12367111/7686176/19134562= 12/xyzzy [rebecca@openfw.io] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- --_000_MN6PR11MB8244C556A2DC7D969674B8018C7B2MN6PR11MB8244namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
spec does not say the unregistration is allowed inside han= dler. it's just to improve the qualiquali the code.

thanks,
ray
From: Laszlo Ersek <lers= ek@redhat.com>
Sent: Wednesday, January 24, 2024 9:06:13 PM
To: devel@edk2.groups.io <devel@edk2.groups.io>; Ni, Ray <r= ay.ni@intel.com>; Liu, Zhiguang <zhiguang.liu@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>; Wu, Jiaxin <jiax= in.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@intel.com>

Reviewed-by: Laszlo Ersek <lersek@redhat.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 <zhiguang.liu@intel.com>; Liming Gao
>> <gaoliming@byosoft.com.cn>; Wu, Jiaxin <jiaxin.wu@intel.c= om>; 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 <gaoliming@byosoft.com.cn>
>> Cc: Jiaxin Wu <jiaxin.wu@intel.com>
>> Cc: Ray Ni <ray.ni@intel.com>
>> 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
>
>
>
>
>
>

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