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charset="us-ascii" Content-Transfer-Encoding: quoted-printable All, This mail is to bring another approach to solve the stack-overflow due to n= ested interrupts. Michael solved this problem in OVMF through NestedInterru= ptTplLib. I made a draft patch as attached "DxeCore.diff". The patch simply to avoid = the interrupt in enable state when TPL is dropped to the interrupted TPL. T= he interrupt will be enabled later through "IRET". So, a timer driver has two ways to implement its timer interrupt handler: 1. Do raise/restore TPL in the TimerInterruptHandler(). But call the A= PIs in NestedInterruptTplLib. 2. Do not raise/restore TPL in the TimerInterruptHandler(). So that on= ly DxeCore restores the TPL. And when DxeCore restores the TPL, the interru= pt is not enabled when TPL is dropped to the interrupted TPL (as it will be= enabled later by "IRET"). Implementing the logic in DxeCore does not prevent the TimerInterruptHandle= r() from implementing the way #1. Agree on the draft patch? My 2nd question is can we set a rule that TimerInterruptHandler() should NO= T restore TPL so that way #2 (changing DxeCore) is enough to solve the stac= k overflow issue due to nested interrupts. I was aware of the discussion between Laszlo and Michael in end of 2022 but= never dig deeply as today into this problem. I really appreciate the long discussion in the bugzilla (https://bugzilla.t= ianocore.org/show_bug.cgi?id=3D4162) and comments in NestedInterruptTplLib.= I learned a lot from them and they are quite interesting! Thanks, Ray -=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 (#114369): https://edk2.groups.io/g/devel/message/114369 Mute This Topic: https://groups.io/mt/103950154/7686176 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_MN6PR11MB82443B73244CEF84481629F08C7A2MN6PR11MB8244namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

All,=

This= mail is to bring another approach to solve the stack-overflow due to neste= d interrupts. Michael solved this problem in OVMF through NestedInterruptTp= lLib.

 

I ma= de a draft patch as attached “DxeCore.diff”. The patch simply t= o avoid the interrupt in enable state when TPL is dropped to the interrupte= d TPL. The interrupt will be enabled later through “IRET”.

 

So, = a timer driver has two ways to implement its timer interrupt handler:<= /o:p>

1.      Do raise/restore TPL in the TimerInterruptHandler(). But call the APIs = in NestedInterruptTplLib.

2.      Do not raise/restore TPL in the TimerInterruptHandler(). So that only D= xeCore restores the TPL. And when DxeCore restores the TPL, the interrupt i= s not enabled when TPL is dropped to the interrupted TPL (as it will be enabled later by “IRET”).

 

 

Impl= ementing the logic in DxeCore does not prevent the TimerInterruptHandler() = from implementing the way #1.

Agre= e on the draft patch?

 

My 2= nd question is can we set a rule that TimerInterruptHandler() sh= ould NOT restore TPL so that way #2 (changing DxeCore) is enough to solve t= he stack overflow issue due to nested interrupts.

 

I wa= s aware of the discussion between Laszlo and Michael in end of 2022 but nev= er dig deeply as today into this problem.

I re= ally appreciate the long discussion in the bugzilla (https://bugzilla.tianocore.org/= show_bug.cgi?id=3D4162) and comments in NestedInterruptTplLib. I learned a lot from them and they are quite intere= sting!

 =

Thanks,

Ray

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