From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Tom Lendacky <thomas.lendacky@amd.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>,
"Radim Krčmář" <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>
Subject: Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3
Date: Fri, 9 Jun 2017 19:54:04 +0100 [thread overview]
Message-ID: <2d507507-8736-89ff-0579-c2eee4b3ac34__23555.4645107642$1497034527$gmane$org@citrix.com> (raw)
In-Reply-To: <8e8eac45-95be-f1b5-6f44-f131d275f7bc@oracle.com>
On 09/06/17 19:43, Boris Ostrovsky wrote:
> On 06/09/2017 02:36 PM, Tom Lendacky wrote:
>>> basis, although (as far as I am aware) Xen as a whole would be able to
>>> encompass itself and all of its PV guests inside one single SME
>>> instance.
>> Yes, that is correct.
Thinking more about this, it would only be possible if all the PV guests
were SME-aware and understood not to choke when it finds a frame with a
high address bit set.
I expect the only viable way to implement this (should we wish) is to
have PV guests explicitly signal support (probably via an ELF note),
after which it needs to know about the existence of SME, the meaning of
the encrypted bit in PTEs, and to defer all configuration responsibility
to Xen.
~Andrew
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-06-09 18:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170607191309.28645.15241.stgit@tlendack-t1.amdoffice.net>
[not found] ` <20170607191453.28645.92256.stgit@tlendack-t1.amdoffice.net>
2017-06-07 22:06 ` [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Boris Ostrovsky
[not found] ` <b15e8924-4069-b5fa-adb2-86c164b1dd36@oracle.com>
2017-06-08 13:42 ` Tom Lendacky
[not found] ` <4a7376fb-abfc-8edd-42b7-38de461ac65e@amd.com>
2017-06-08 20:51 ` Boris Ostrovsky
[not found] ` <67fe69ac-a213-8de3-db28-0e54bba95127@oracle.com>
2017-06-08 21:02 ` Tom Lendacky
[not found] ` <fcb196c8-f1eb-a38c-336c-7bd3929b029e@amd.com>
2017-06-08 21:17 ` Boris Ostrovsky
[not found] ` <12c7e511-996d-cf60-3a3b-0be7b41bd85b@oracle.com>
2017-06-08 22:01 ` Andrew Cooper
[not found] ` <d37917b1-8e49-e8a8-b9ac-59491331640f@citrix.com>
2017-06-09 18:36 ` Tom Lendacky
[not found] ` <9725c503-2e33-2365-87f5-f017e1cbe9b6@amd.com>
2017-06-09 18:43 ` Boris Ostrovsky
[not found] ` <8e8eac45-95be-f1b5-6f44-f131d275f7bc@oracle.com>
2017-06-09 18:54 ` Andrew Cooper [this message]
2017-06-09 18:59 ` Tom Lendacky
[not found] ` <33f20df0-bf71-bd9d-7a7e-4fb5e8793400@amd.com>
2017-06-09 19:42 ` Boris Ostrovsky
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