linux-kernel - RE: [PATCH V5 3/3] efi: Use efi_rts_wq to invoke EFI Runtime Services

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Date:   Tue, 5 Jun 2018 19:29:13 +0000
From:   "Prakhya, Sai Praneeth" <sai.praneeth.prakhya@...el.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:     linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lee Chun-Yi <jlee@...e.com>, Borislav Petkov <bp@...en8.de>,
        "Luck, Tony" <tony.luck@...el.com>,
        Will Deacon <will.deacon@....com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Naresh Bhat <naresh.bhat@...aro.org>,
        "Neri, Ricardo" <ricardo.neri@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: RE: [PATCH V5 3/3] efi: Use efi_rts_wq to invoke EFI Runtime
 Services

> > +       case RESET_SYSTEM:
> > +               __efi_call_virt(reset_system, *(int *)arg1,
> > +                               *(efi_status_t *)arg2,
> > +                               *(unsigned long *)arg3,
> > +                               (efi_char16_t *)arg4);
> > +               break;
> 
> I noticed that -unsurprisingly- reboot no longer works with these changes.
> 
> I will fix up the patch, and revert the efi_reset_system() change, both here and
> below.

Could you please let me know what the bug is here? I am unable to see it right away :(
I have tested reboot on qemu x86_64 by passing "reboot=efi" as command line arg and 
saw that reboot is working fine.

> > @@ -340,7 +441,8 @@ static void virt_efi_reset_system(int reset_type,
> >                         "could not get exclusive access to the firmware\n");
> >                 return;
> >         }
> > -       __efi_call_virt(reset_system, reset_type, status, data_size, data);
> > +       efi_queue_work(RESET_SYSTEM, &reset_type, &status, &data_size, data,
> > +                      NULL);
> >         up(&efi_runtime_lock);
> >  }

Regards,
Sai