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Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
- From: Tom Lendacky <thomas.lendacky@xxxxxxx>
- Date: Thu, 8 Jun 2017 16:02:37 -0500
- Cc: Brijesh Singh <brijesh.singh@xxxxxxx>, Toshimitsu Kani <toshi.kani@xxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Larry Woodman <lwoodman@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Delivery-date: Thu, 08 Jun 2017 21:02:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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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
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