From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: kevin.tian@intel.com, wei.liu2@citrix.com,
ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com,
george.dunlap@eu.citrix.com, ian.jackson@eu.citrix.com,
xen-devel@lists.xen.org, jun.nakajima@intel.com,
Huaitong Han <huaitong.han@intel.com>,
keir@xen.org
Subject: Re: [PATCH 00/10] x86/hvm: pkeys, add memory protection-key support
Date: Tue, 17 Nov 2015 16:24:15 +0000 [thread overview]
Message-ID: <564B54AF.9030009@citrix.com> (raw)
In-Reply-To: <564B0ED902000078000B5C8E@prv-mh.provo.novell.com>
On 17/11/15 10:26, Jan Beulich wrote:
>>>> On 16.11.15 at 18:45, <andrew.cooper3@citrix.com> wrote:
>> Furthermore, it is unclear (given the unwritten ABI) whether it is even
>> safe to move _PAGE_GNTTAB out of the way, as this is visible to a PV guest.
> It seems pretty clear to me that this would be unsafe: It being
> part of L1_DISALLOW_MASK, if it moved and a guest used the
> bit for its own purposes, the guest would break. I guess we'll
> need an ELF note by which the guest can advertise which of the
> available bits it doesn't care about itself.
Well - it depends whether any of these bits actually get used.
If none actually do get used, we would be better to retro-fit a real ABI
in place, without requiring all new guests to opt-in to get new features.
~Andrew
next prev parent reply other threads:[~2015-11-17 16:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-16 10:31 [PATCH 00/10] x86/hvm: pkeys, add memory protection-key support Huaitong Han
2015-11-16 10:31 ` [PATCH 01/10] x86/hvm: pkeys, add pkeys support for cpuid handling Huaitong Han
2015-11-16 12:00 ` Andrew Cooper
2015-11-19 14:39 ` Wu, Feng
2015-11-16 16:58 ` Wei Liu
2015-11-16 10:31 ` [PATCH 02/10] x86/hvm: pkeys, add pku support for x86_capability Huaitong Han
2015-11-16 13:35 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 03/10] x86/hvm: pkeys, add the flag to enable Memory Protection Keys Huaitong Han
2015-11-16 13:56 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 04/10] x86/hvm: pkeys, add pkeys support when setting CR4 Huaitong Han
2015-11-16 14:02 ` Andrew Cooper
2015-11-20 1:16 ` Wu, Feng
2015-11-20 10:41 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 05/10] x86/hvm: pkeys, disable pkeys for guests in non-paging mode Huaitong Han
2015-11-16 14:03 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 06/10] x86/hvm: pkeys, add functions to get pkeys value from PTE Huaitong Han
2015-11-16 14:16 ` Andrew Cooper
2015-11-16 14:42 ` Jan Beulich
2015-11-16 10:31 ` [PATCH 07/10] x86/hvm: pkeys, add functions to support PKRU access/write Huaitong Han
2015-11-16 15:09 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 08/10] x86/hvm: pkeys, add pkeys support for do_page_fault Huaitong Han
2015-11-16 15:25 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 09/10] x86/hvm: pkeys, add pkeys support for guest_walk_tables Huaitong Han
2015-11-16 16:52 ` Andrew Cooper
2015-11-16 16:59 ` Andrew Cooper
2015-11-16 10:31 ` [PATCH 10/10] x86/hvm: pkeys, add xstate support for pkeys Huaitong Han
2015-11-16 16:52 ` Andrew Cooper
2015-11-16 17:45 ` [PATCH 00/10] x86/hvm: pkeys, add memory protection-key support Andrew Cooper
2015-11-17 10:26 ` Jan Beulich
2015-11-17 16:24 ` Andrew Cooper [this message]
2015-11-17 16:36 ` Jan Beulich
2015-11-18 9:12 ` Wu, Feng
2015-11-18 10:10 ` Andrew Cooper
2015-11-19 7:44 ` Wu, Feng
2015-11-19 8:44 ` Jan Beulich
2015-11-19 8:49 ` Wu, Feng
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