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Groups > linux.kernel > #1661697
| From | Boris Ostrovsky <boris.ostrovsky@oracle.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 |
| Date | 2017-06-08 23:20 +0200 |
| Message-ID | <tQd0u-11f-11@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <tPRjk-44i-21@gated-at.bofh.it> <tPRjk-44i-17@gated-at.bofh.it> <tQcH7-FJ-21@gated-at.bofh.it> <tQcH7-FJ-19@gated-at.bofh.it> <tQd0u-11f-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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
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Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-06-08 00:10 +0200
Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-06-08 23:00 +0200
Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-06-08 23:20 +0200
Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Andrew Cooper <andrew.cooper3@citrix.com> - 2017-06-09 00:10 +0200
Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-06-09 20:50 +0200
Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Andrew Cooper <andrew.cooper3@citrix.com> - 2017-06-09 21:00 +0200
Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-06-09 21:50 +0200
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