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xen-devel
Re: [Xen-devel] [PATCH 03/10] xen/mmu: Add the notion of IDENTITY_P2M_EN
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 03/10] xen/mmu: Add the notion of IDENTITY_P2M_ENTRY. |
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From: |
Ian Campbell <Ian.Campbell@xxxxxxxxxx> |
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Date: |
Wed, 22 Dec 2010 08:44:19 +0000 |
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Cc: |
"jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Rzeszutek Wilk <konrad@xxxxxxxxxx>, Konrad, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx> |
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Wed, 22 Dec 2010 00:44:55 -0800 |
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<1292967460-15709-1-git-send-email-konrad.wilk@xxxxxxxxxx> <1292967460-15709-4-git-send-email-konrad.wilk@xxxxxxxxxx> |
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On Tue, 2010-12-21 at 21:37 +0000, Konrad Rzeszutek Wilk wrote:
> P.S.
> We cannot set the IDENTITY_P2M_ENTRY in the P2M tree. This is b/c
> the toolstack considers that invalid and would abort during
> migration of the PV guest.
What do we do instead, just write the actual identity MFN value?
Does using 1UL<<30 (or 1UL<<62 on 64 bit, note that Jeremy recently
fixed FOREIGN_FRAME_BIT too) as IDENTITY_P2M_ENTRY keep the toolstack
happy while still allowing us to distinguish from identity from
happens-to-be-the-same as necessary?
To some extent 1-1 I/O regions could be considered foreign mappings (of
"memory" owned by DOMIO) so perhaps it's possible that setting the
FOREIGN_FRAME_BIT is both sufficient and correct?
Ian.
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- [Xen-devel] Re: [PATCH 01/10] xen: Make all reserved pages for the balloon be INVALID_P2M_ENTRY., (continued)
[Xen-devel] [PATCH 09/10] xen/mmu: Be aware of p2m_[mid_|]missing when saving/restore., Konrad Rzeszutek Wilk
[Xen-devel] [PATCH 04/10] xen/mmu: For 1-1 mapping, automatically set _PAGE_IOMAP., Konrad Rzeszutek Wilk
[Xen-devel] [PATCH 03/10] xen/mmu: Add the notion of IDENTITY_P2M_ENTRY., Konrad Rzeszutek Wilk
- Re: [Xen-devel] [PATCH 03/10] xen/mmu: Add the notion of IDENTITY_P2M_ENTRY.,
Ian Campbell <=
[Xen-devel] [PATCH 06/10] xen/setup: Only set identity mapping in E820 regions when privileged., Konrad Rzeszutek Wilk
[Xen-devel] [PATCH 02/10] xen/p2m: change p2m_missing_* to p2m_identity_*, Konrad Rzeszutek Wilk
[Xen-devel] [PATCH 10/10] xen/mmu: Warn against races., Konrad Rzeszutek Wilk
[Xen-devel] [PATCH 05/10] xen/setup: Set identity mapping for non-RAM E820 and E820 gaps., Konrad Rzeszutek Wilk
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