From: Peter Zijlstra <peterz@infradead.org>
To: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, ricardo.neri@intel.com, matt@codeblueprint.co.uk,
Al Stone <astone@redhat.com>, Borislav Petkov <bp@alien8.de>,
Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Bhupesh Sharma <bhsharma@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [PATCH V4 3/3] x86/efi: Introduce EFI_PAGE_FAULT_HANDLER
Date: Fri, 7 Sep 2018 13:22:07 +0200 [thread overview]
Message-ID: <20180907112207.GS24106@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1536276468-28499-4-git-send-email-sai.praneeth.prakhya@intel.com>
On Thu, Sep 06, 2018 at 04:27:48PM -0700, Sai Praneeth Prakhya wrote:
> From: Sai Praneeth <sai.praneeth.prakhya@intel.com>
>
> There may exist some buggy UEFI firmware implementations that might
> access efi regions other than EFI_RUNTIME_SERVICES_<CODE/DATA> even
> after the kernel has assumed control of the platform. This violates UEFI
> specification.
>
> If selected, this debug option will print a warning message if the UEFI
> firmware tries to access any memory region which it shouldn't. Along
> with the warning, the efi page fault handler will also try to recover
> from the page fault triggered by the firmware so that the machine
> doesn't hang.
Why make this optional?
next prev parent reply other threads:[~2018-09-07 11:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 23:27 [PATCH V4 0/3] Add efi page fault handler to recover from page Sai Praneeth Prakhya
2018-09-06 23:27 ` [PATCH V4 1/3] efi: Make efi_rts_work accessible to efi page fault handler Sai Praneeth Prakhya
2018-09-06 23:27 ` [PATCH V4 2/3] x86/efi: Add efi page fault handler to recover from page faults caused by the firmware Sai Praneeth Prakhya
2018-09-07 11:21 ` Peter Zijlstra
2018-09-07 18:29 ` Prakhya, Sai Praneeth
2018-09-06 23:27 ` [PATCH V4 3/3] x86/efi: Introduce EFI_PAGE_FAULT_HANDLER Sai Praneeth Prakhya
2018-09-07 11:22 ` Peter Zijlstra [this message]
2018-09-07 18:23 ` Prakhya, Sai Praneeth
2018-09-07 18:49 ` Bhupesh Sharma
2018-09-07 19:08 ` Prakhya, Sai Praneeth
2018-09-07 19:22 ` Thomas Gleixner
2018-09-07 19:55 ` Bhupesh Sharma
2018-09-07 20:13 ` Thomas Gleixner
2018-09-07 10:42 ` [PATCH V4 0/3] Add efi page fault handler to recover from page Ard Biesheuvel
2018-09-07 18:32 ` Prakhya, Sai Praneeth
2018-09-07 19:03 ` Bhupesh Sharma
2018-09-07 19:13 ` Prakhya, Sai Praneeth
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