linux-kernel - Re: [PATCHv4 3/3] x86/tdx: Handle load_unaligned

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Date:   Wed, 15 Jun 2022 15:36:02 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        luto@...nel.org, peterz@...radead.org, ak@...ux.intel.com,
        dan.j.williams@...el.com, david@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, seanjc@...gle.com,
        thomas.lendacky@....com, x86@...nel.org
Subject: Re: [PATCHv4 3/3] x86/tdx: Handle load_unaligned_zeropad() page-cross
 to a shared page

On 6/15/22 15:32, Kirill A. Shutemov wrote:
>>>         /*
>>>          * Reject EPT violation #VEs that split pages.
>>>          *
>>>          * MMIO accesses are supposed to be naturally aligned and therefore
>>>          * never cross page boundaries. Seeing split page accesses indicates
>>>          * a bug or a load_unaligned_zeropad() that stepped into an MMIO page.
>>>          *
>>>          * load_unaligned_zeropad() will recover using exception fixups.
>>>          */
> Looks good, thanks.

I've got that snippet and a few other things staged here:

> https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git/log/?h=testme

Could you take a quick look through before I push them somewhere for real?