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

From	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Newsgroups	linux.kernel
Subject	Re: [Xen-devel] [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3
Date	2017-06-09 21:50 +0200
Message-ID	<tQy4W-5Fa-3@gated-at.bofh.it> (permalink)
References	(6 earlier) <tQd0u-11f-11@gated-at.bofh.it> <tQdMS-1yv-11@gated-at.bofh.it> <tQx8R-55Y-7@gated-at.bofh.it> <tQx8R-55Y-5@gated-at.bofh.it> <tQy4W-5Fa-5@gated-at.bofh.it>
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>>
>> 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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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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