linux-kernel - Re: [PATCH v3 1/2] x86: Don't let pgprot_modify() change the page encryption bit

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Message-ID: <MN2PR05MB61416C02E95D28652B432BB7A19D0@MN2PR05MB6141.namprd05.prod.outlook.com>
Date:   Tue, 1 Oct 2019 05:54:22 +0000
From:   Thomas Hellstrom <thellstrom@...are.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Pv-drivers <Pv-drivers@...are.com>,
        Linux-graphics-maintainer <Linux-graphics-maintainer@...are.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christian König <christian.koenig@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v3 1/2] x86: Don't let pgprot_modify() change the page
 encryption bit

Hi,

On 9/18/19 7:57 PM, Dave Hansen wrote:
> On 9/17/19 6:01 AM, Thomas Hellström (VMware) wrote:
>> diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
>> index b5e49e6bac63..8267dd426b15 100644
>> --- a/arch/x86/include/asm/pgtable_types.h
>> +++ b/arch/x86/include/asm/pgtable_types.h
>> @@ -123,7 +123,7 @@
>>   */
>>  #define _PAGE_CHG_MASK	(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |		\
>>  			 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY |	\
>> -			 _PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
>> +			 _PAGE_SOFT_DIRTY | _PAGE_DEVMAP | _PAGE_ENC)
>>  #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
> My only nit with what remains is that it expands the infestation of
> things that look like a simple macro but are not.
>
> I'm debating whether we want to go fix that now, though.
>
Any chance for an ack on this? It's really a small change that, as we've
found out, fixes an existing problem.

Thanks,

Thomas