linux-kernel - Re: [PATCH v7 11/36] x86/mm: Add SME support for read_cr3

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Date:   Tue, 20 Jun 2017 11:23:03 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        X86 ML <x86@...nel.org>, kexec@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        xen-devel <xen-devel@...ts.xen.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        iommu@...ts.linux-foundation.org,
        Brijesh Singh <brijesh.singh@....com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Alexander Potapenko <glider@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Joerg Roedel <joro@...tes.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dave Young <dyoung@...hat.com>, Rik van Riel <riel@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Juergen Gross <jgross@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v7 11/36] x86/mm: Add SME support for read_cr3_pa()

On 6/20/2017 11:17 AM, Andy Lutomirski wrote:
> On Fri, Jun 16, 2017 at 11:51 AM, Tom Lendacky <thomas.lendacky@....com> wrote:
>> The cr3 register entry can contain the SME encryption mask that indicates
>> the PGD is encrypted.  The encryption mask should not be used when
>> creating a virtual address from the cr3 register, so remove the SME
>> encryption mask in the read_cr3_pa() function.
>>
>> During early boot SME will need to use a native version of read_cr3_pa(),
>> so create native_read_cr3_pa().
>>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
>> ---
>>   arch/x86/include/asm/processor-flags.h |    3 ++-
>>   arch/x86/include/asm/processor.h       |    5 +++++
>>   2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h
>> index 79aa2f9..cb6999c 100644
>> --- a/arch/x86/include/asm/processor-flags.h
>> +++ b/arch/x86/include/asm/processor-flags.h
>> @@ -2,6 +2,7 @@
>>   #define _ASM_X86_PROCESSOR_FLAGS_H
>>
>>   #include <uapi/asm/processor-flags.h>
>> +#include <linux/mem_encrypt.h>
>>
>>   #ifdef CONFIG_VM86
>>   #define X86_VM_MASK    X86_EFLAGS_VM
>> @@ -33,7 +34,7 @@
>>    */
>>   #ifdef CONFIG_X86_64
>>   /* Mask off the address space ID bits. */
>> -#define CR3_ADDR_MASK 0x7FFFFFFFFFFFF000ull
>> +#define CR3_ADDR_MASK __sme_clr(0x7FFFFFFFFFFFF000ull)
> 
> Can you update the comment one line above, too?

Yup, will do.

Thanks,
Tom

>