From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Date: Thu, 8 Jun 2017 17:17:29 -0400 Message-ID: <12c7e511-996d-cf60-3a3b-0be7b41bd85b@oracle.com> References: <20170607191309.28645.15241.stgit@tlendack-t1.amdoffice.net> <20170607191453.28645.92256.stgit@tlendack-t1.amdoffice.net> <4a7376fb-abfc-8edd-42b7-38de461ac65e@amd.com> <67fe69ac-a213-8de3-db28-0e54bba95127@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: owner-linux-mm@kvack.org To: Tom Lendacky , 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: Rik van Riel , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , "Michael S. Tsirkin" , Joerg Roedel , Konrad Rzeszutek Wilk , Paolo Bonzini , Larry Woodman , Brijesh Singh , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. Peter Anvin" , Andrey Ryabinin , Alexander Potapenko , Dave Young , Thomas Gleixner , Dmitry Vyukov List-Id: linux-efi@vger.kernel.org On 06/08/2017 05:02 PM, Tom Lendacky wrote: > 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? Oh, I misread the patch where X86_FEATURE_SME is defined. Then all versions, including the current one, pass it unchanged. All that's needed is setup_clear_cpu_cap(X86_FEATURE_SME) in xen_init_capabilities(). -boris -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org