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

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Date:   Thu, 16 Jun 2022 02:16:15 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.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 Wed, Jun 15, 2022 at 03:36:02PM -0700, Dave Hansen wrote:
> 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?

Looks good to me. Could you fold in the off-by-one fix? 

-- 
 Kirill A. Shutemov