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From: Wei Liu <wl@xen.org>
To: Jan Beulich <jbeulich@suse.com>
Cc: "Wei Liu" <wl@xen.org>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	jgrall@amazon.com, "Hongyan Xia" <hongyxia@amazon.com>,
	xen-devel@lists.xenproject.org,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v6] x86: introduce a new set of APIs to manage Xen page tables
Date: Thu, 20 Feb 2020 12:47:42 +0000	[thread overview]
Message-ID: <20200220124742.44x46evpf67cznmn@debian> (raw)
In-Reply-To: <f2560c00-dc49-f709-d59a-dc057288ab67@suse.com>

On Thu, Feb 20, 2020 at 01:10:56PM +0100, Jan Beulich wrote:
> On 28.01.2020 15:21, Wei Liu wrote:
> > On Tue, Jan 28, 2020 at 01:50:05PM +0000, Hongyan Xia wrote:
> >> From: Wei Liu <wei.liu2@citrix.com>
> >>
> >> We are going to switch to using domheap page for page tables.
> >> A new set of APIs is introduced to allocate and free pages of page
> >> tables based on mfn instead of the xenheap direct map address. The
> >> allocation and deallocation work on mfn_t but not page_info, because
> >> they are required to work even before frame table is set up.
> >>
> >> Implement the old functions with the new ones. We will rewrite, site
> >> by site, other mm functions that manipulate page tables to use the new
> >> APIs.
> >>
> >> After the allocation, one needs to map and unmap via map_domain_page to
> >> access the PTEs. This does not break xen half way, since the new APIs
> >> still use xenheap pages underneath, and map_domain_page will just use
> >> the directmap for mappings. They will be switched to use domheap and
> >> dynamic mappings when usage of old APIs is eliminated.
> >>
> >> No functional change intended in this patch.
> >>
> >> Signed-off-by: Wei Liu <wei.liu2@citrix.com>
> >> Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
> >> Reviewed-by: Julien Grall <jgrall@amazon.com>
> > 
> > Reviewed-by: Wei Liu <wl@xen.org>
> 
> Acked-by: Jan Beulich <jbeulich@suse.com>

Thanks. I have pushed this patch to unblock Hongyan.

Wei.

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  reply	other threads:[~2020-02-20 12:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28 13:50 [Xen-devel] [PATCH v6] x86: introduce a new set of APIs to manage Xen page tables Hongyan Xia
2020-01-28 14:21 ` Wei Liu
2020-02-20 12:10   ` Jan Beulich
2020-02-20 12:47     ` Wei Liu [this message]
2020-02-05 16:25 ` Xia, Hongyan
2020-02-05 16:47   ` Jan Beulich
2020-02-05 17:45     ` Julien Grall
2020-02-06  8:30       ` Jan Beulich

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