linux-kernel - Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3

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Message-ID: <fcb196c8-f1eb-a38c-336c-7bd3929b029e@amd.com>
Date:   Thu, 8 Jun 2017 16:02:37 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org
Cc:     Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Juergen Gross <jgross@...e.com>,
        xen-devel <xen-devel@...ts.xen.org>
Subject: Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against
 just the physical address in cr3

On 6/8/2017 3:51 PM, Boris Ostrovsky wrote:
> 
>>
>>> What may be needed is making sure X86_FEATURE_SME is not set for PV
>>> guests.
>>
>> And that may be something that Xen will need to control through either
>> CPUID or MSR support for the PV guests.
> 
> 
> Only on newer versions of Xen. On earlier versions (2-3 years old) leaf
> 0x80000007 is passed to the guest unchanged. And so is MSR_K8_SYSCFG.

The SME feature is in leaf 0x8000001f, is that leaf passed to the guest
unchanged?

Thanks,
Tom

> 
> -boris
>