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Subject: Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use
 __va() against just the physical address in cr3
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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Date: Fri, 9 Jun 2017 15:42:24 -0400
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To: Tom Lendacky <thomas.lendacky@amd.com>, Andrew Cooper <andrew.cooper3@citrix.com>, linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org
Cc: Brijesh Singh <brijesh.singh@amd.com>, Toshimitsu Kani <toshi.kani@hpe.com>, "Michael S. Tsirkin" <mst@redhat.com>, Matt Fleming <matt@codeblueprint.co.uk>, Alexander Potapenko <glider@google.com>, "H. Peter Anvin" <hpa@zytor.com>, Larry Woodman <lwoodman@redhat.com>, Jonathan Corbet <corbet@lwn.net>, Joerg Roedel <joro@8bytes.org>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Ingo Molnar <mingo@redhat.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Dave Young <dyoung@redhat.com>, Rik van Riel <riel@redhat.com>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Dmitry Vyukov <dvyukov@google.com>, Juergen Gross <jgross@suse.com>, xen-devel <xen-devel@lists.xen.org>, Paolo Bonzini <pbonzini@redhat.com>


>>
>> PV guests don't go through Linux x86 early boot code. They start at
>> xen_start_kernel() (well, xen-head.S:startup_xen(), really) and  merge
>> with baremetal path at x86_64_start_reservations() (for 64-bit).
>>
>
> Ok, I don't think anything needs to be done then. The sme_me_mask is set
> in sme_enable() which is only called from head_64.S. If the sme_me_mask
> isn't set then SME won't be active. The feature will just report the
> capability of the processor, but that doesn't mean it is active. If you
> still want the feature to be clobbered we can do that, though.

I'd prefer to explicitly clear to avoid any ambiguity.

-boris

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