From: "H. Peter Anvin" <hpa@zytor.com>
To: David Vrabel <david.vrabel@citrix.com>, xen-devel@lists.xen.org
Cc: x86@kernel.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 8/8] x86: remove the Xen-specific _PAGE_IOMAP PTE flag
Date: Mon, 24 Feb 2014 09:51:03 -0800 [thread overview]
Message-ID: <530B8687.6040406@zytor.com> (raw)
In-Reply-To: <1393263564-14038-9-git-send-email-david.vrabel@citrix.com>
On 02/24/2014 09:39 AM, David Vrabel wrote:
> From: David Vrabel <david.vrabel@citrix.com>
>
> The _PAGE_IO_MAP PTE flag was only used by Xen PV guests to mark PTEs
> that were used to map I/O regions that are 1:1 in the p2m. This
> allowed Xen to obtain the correct PFN when converting the MFNs read
> from a PTE back to their PFN.
>
> Xen guests no longer use _PAGE_IOMAP for this. Instead mfn_to_pfn()
> returns the correct PFN by using a combination of the m2p and p2m to
> determine if an MFN corresponds to a 1:1 mapping in the the p2m.
>
> Remove _PAGE_IOMAP, replacing it with _PAGE_UNUSED2 to allow for
> future uses of the PTE flag.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: x86@kernel.org
> --
> This depends on the preceeding Xen changes, so I think it would be
> best if this was acked by an x86 maintainer and merged via the Xen
> tree.
Acked-by: H. Peter Anvin <hpa@zytor.com>
Yay, a bit back!
-hpa
next prev parent reply other threads:[~2014-02-24 17:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-24 17:39 [PATCHv5 0/8] x86/xen: fixes for mapping high MMIO regions (and remove _PAGE_IOMAP) David Vrabel
2014-02-24 17:39 ` [PATCH 1/8] x86/xen: rename early_p2m_alloc() and early_p2m_alloc_middle() David Vrabel
2014-02-24 17:39 ` [PATCH 2/8] x86/xen: fix set_phys_range_identity() if pfn_e > MAX_P2M_PFN David Vrabel
2014-02-24 17:39 ` [PATCH 3/8] x86/xen: compactly store large identity ranges in the p2m David Vrabel
2014-02-24 17:39 ` [PATCH 4/8] x86/xen: only warn once if bad MFNs are found during setup David Vrabel
2014-02-24 17:39 ` [PATCH 5/8] x86/xen: set regions above the end of RAM as 1:1 David Vrabel
2014-02-24 17:39 ` [PATCH 6/8] x86/xen: do not use _PAGE_IOMAP in xen_remap_domain_mfn_range() David Vrabel
2014-02-24 17:39 ` [PATCH 7/8] x86/xen: do not use _PAGE_IOMAP PTE flag for I/O mappings David Vrabel
2014-02-24 17:39 ` [PATCH 8/8] x86: remove the Xen-specific _PAGE_IOMAP PTE flag David Vrabel
2014-02-24 17:51 ` H. Peter Anvin [this message]
-- strict thread matches above, loose matches on Subject: below --
2014-02-03 17:01 [PATCHv4 0/8] x86/xen: fixes for mapping high MMIO regions (and remove _PAGE_IOMAP) David Vrabel
2014-02-03 17:01 ` [PATCH 8/8] x86: remove the Xen-specific _PAGE_IOMAP PTE flag David Vrabel
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