linux-kernel - RE: [PATCH 0/2] Fix boot hang issue on Ampere Emag server

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Message-ID: <DBBPR08MB4538A93FD989ACB7B32D6A1AF7D89@DBBPR08MB4538.eurprd08.prod.outlook.com>
Date:   Wed, 8 Feb 2023 03:10:26 +0000
From:   Justin He <Justin.He@....com>
To:     Ard Biesheuvel <ardb@...nel.org>
CC:     Huacai Chen <chenhuacai@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexandru Elisei <Alexandru.Elisei@....com>,
        "Jason A. Donenfeld" <Jason@...c4.com>, nd <nd@....com>
Subject: RE: [PATCH 0/2] Fix boot hang issue on Ampere Emag server

Hi Ard

> -----Original Message-----
> From: Ard Biesheuvel <ardb@...nel.org>
> Sent: Tuesday, February 7, 2023 5:09 PM
> To: Justin He <Justin.He@....com>
> Cc: Huacai Chen <chenhuacai@...nel.org>; linux-efi@...r.kernel.org;
> linux-kernel@...r.kernel.org; Alexandru Elisei <Alexandru.Elisei@....com>;
> Jason A. Donenfeld <Jason@...c4.com>; nd <nd@....com>
> Subject: Re: [PATCH 0/2] Fix boot hang issue on Ampere Emag server
> 
> On Tue, 7 Feb 2023 at 10:08, Justin He <Justin.He@....com> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Ard Biesheuvel <ardb@...nel.org>
> > > Sent: Tuesday, February 7, 2023 5:04 PM
> > > To: Justin He <Justin.He@....com>
> > > Cc: Huacai Chen <chenhuacai@...nel.org>; linux-efi@...r.kernel.org;
> > > linux-kernel@...r.kernel.org; Alexandru Elisei
> > > <Alexandru.Elisei@....com>; Jason A. Donenfeld <Jason@...c4.com>; nd
> > > <nd@....com>
> > > Subject: Re: [PATCH 0/2] Fix boot hang issue on Ampere Emag server
> > >
> > > On Tue, 7 Feb 2023 at 10:03, Justin He <Justin.He@....com> wrote:
> > > >
> > > > Hi Ard
> > > >
> > > > > -----Original Message-----
> > > > > From: Ard Biesheuvel <ardb@...nel.org>
> > > > > Sent: Tuesday, February 7, 2023 4:54 PM
> > > > > To: Justin He <Justin.He@....com>
> > > > > Cc: Huacai Chen <chenhuacai@...nel.org>;
> > > > > linux-efi@...r.kernel.org; linux-kernel@...r.kernel.org;
> > > > > Alexandru Elisei <Alexandru.Elisei@....com>; Jason A. Donenfeld
> > > > > <Jason@...c4.com>; nd <nd@....com>
> > > > > Subject: Re: [PATCH 0/2] Fix boot hang issue on Ampere Emag
> > > > > server
> > > > >
> > > > > On Tue, 7 Feb 2023 at 09:49, Justin He <Justin.He@....com> wrote:
> > > > > >
> > > > > >
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > [..]
> > > > > > > > The root cause of the hung IMO might be similar to commit
> > > > > > > > 550b33cfd445296868a478e8413ffb2e963eed32
> > > > > > > > Author: Ard Biesheuvel <ardb@...nel.org>
> > > > > > > > Date:   Thu Nov 10 10:36:20 2022 +0100
> > > > > > > >
> > > > > > > >     arm64: efi: Force the use of SetVirtualAddressMap() on
> > > > > > > > Altra machines
> > > > > > > >
> > > > > > > > Do you agree with the idea if I add Ampere ”eMAG” machine
> > > > > > > > into the list of Using SetVirtualAddressMap() forcibly?
> > > > > > > >
> > > > > > > > Please note that even in previous kernel patch, the
> > > > > > > > efibootmgr -t
> > > > > > > > 10 will make kernel hung if I passed "efi=novamap" to the
> > > > > > > > boot
> > > > > parameter.
> > > > > > > >
> > > > > > >
> > > > > > > Interesting. What does dmidecode return for the family in
> > > > > > > the type 1
> > > > > record?
> > > > > >
> > > > > > # dmidecode |grep -i family
> > > > > >         Family: eMAG
> > > > > >         Family: ARMv8
> > > > > >
> > > > > > The full dmidecode log is at https://pastebin.com/M3MAJtUG
> > > > > >
> > > > >
> > > > > OK please try this:
> > > > >
> > > > > diff --git a/drivers/firmware/efi/libstub/arm64.c
> > > > > b/drivers/firmware/efi/libstub/arm64.c
> > > > > index ff2d18c42ee74979..fae930dec82be7c6 100644
> > > > > --- a/drivers/firmware/efi/libstub/arm64.c
> > > > > +++ b/drivers/firmware/efi/libstub/arm64.c
> > > > > @@ -22,7 +22,8 @@ static bool system_needs_vamap(void)
> > > > >          * Ampere Altra machines crash in SetTime() if
> > > > > SetVirtualAddressMap()
> > > > >          * has not been called prior.
> > > > >          */
> > > > > -       if (!type1_family || strcmp(type1_family, "Altra"))
> > > > > +       if (!type1_family ||
> > > > > +           (strcmp(type1_family, "Altra") &&
> > > > > + strcmp(type1_family,
> > > > > + "eMAG")))
> > > > >                 return false;
> > > > >
> > > > >         efi_warn("Working around broken
> > > > > SetVirtualAddressMap()\n");
> > > >
> > > > Yes, it works on my eMAG server: the kernel boots.
> > > > Other than efibootmgr failure. But I noticed this efibootmgr
> > > > failure even before Commit d3549a938b7 ("avoid
> > > > SetVirtualAddressMap() when possible ")
> > > >
> > > > root@:~/linux# efibootmgr -t 9; efibootmgr -t 5; Could not set
> > > > Timeout: Input/output error Could not set Timeout: Input/output
> > > > error
> > > >
> > >
> > > Do you get any [Firmware Bug] lines in the kernel log?
> >
> > No,
> > I built the kernel based on:
> > commit d2d11f342b179f1894a901f143ec7c008caba43e (HEAD -> master,
> > origin/master, origin/HEAD)
> > Author: Linus Torvalds <torvalds@...ux-foundation.org>
> > Date:   Sun Feb 5 17:17:10 2023 -0800
> >
> >     Merge branch 'fixes' of
> > git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
> >
> > Are you worried about your sync exception fixup patch? I think it has been
> included.
> >
> 
> 
> I would just like to understand why setvariable is still broken for you.

On an Ampere *Altra* server, the family name seems to not follow your purpose of invoking efi_get_smbios_string(1, family).

dmidecode |grep -i family -C 10

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: GIGABYTE
        Product Name: R272-P30-00
        Version: 0100
        Serial Number: TS2035812A0022
        UUID: 00000000-0000-4000-8000-B42E99AFEF62
        Wake-up Type: Power Switch
        SKU Number: 01234567890123456789AB
        Family: Server

The full dmidecode info of Altra is at
https://pastebin.com/HQLE1yYv

--
Cheers,
Justin (Jia He)