From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv2 09/10] x86/xen: export xen_alloc_p2m_entry()
Date: Fri, 24 Jul 2015 14:51:36 -0400 [thread overview]
Message-ID: <20150724185136.GB12824__16576.9187304706$1437764003$gmane$org@l.oracle.com> (raw)
In-Reply-To: <1437738468-24110-10-git-send-email-david.vrabel@citrix.com>
On Fri, Jul 24, 2015 at 12:47:47PM +0100, David Vrabel wrote:
> Rename alloc_p2m() to xen_alloc_p2m_entry() and export it.
>
> This is useful for ensuring that a p2m entry is allocated (i.e., not a
> shared missing or identity entry) so that subsequent set_phys_to_machine()
> calls will require no further allocations.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
> arch/x86/include/asm/xen/page.h | 2 ++
> arch/x86/xen/p2m.c | 16 ++++++++++------
> 2 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
> index c44a5d5..960b380 100644
> --- a/arch/x86/include/asm/xen/page.h
> +++ b/arch/x86/include/asm/xen/page.h
> @@ -45,6 +45,8 @@ extern unsigned long *xen_p2m_addr;
> extern unsigned long xen_p2m_size;
> extern unsigned long xen_max_p2m_pfn;
>
> +extern int xen_alloc_p2m_entry(unsigned long pfn);
> +
> extern unsigned long get_phys_to_machine(unsigned long pfn);
> extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
> extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
> diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
> index 8b7f18e..ef93ccf 100644
> --- a/arch/x86/xen/p2m.c
> +++ b/arch/x86/xen/p2m.c
> @@ -503,7 +503,7 @@ static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg)
> * the new pages are installed with cmpxchg; if we lose the race then
> * simply free the page we allocated and use the one that's there.
> */
> -static bool alloc_p2m(unsigned long pfn)
> +int xen_alloc_p2m_entry(unsigned long pfn)
> {
> unsigned topidx, mididx;
> unsigned long *top_mfn_p, *mid_mfn;
> @@ -524,7 +524,7 @@ static bool alloc_p2m(unsigned long pfn)
> /* PMD level is missing, allocate a new one */
> ptep = alloc_p2m_pmd(addr, pte_pg);
> if (!ptep)
> - return false;
> + return -ENOMEM;
> }
>
> if (p2m_top_mfn) {
> @@ -541,7 +541,7 @@ static bool alloc_p2m(unsigned long pfn)
>
> mid_mfn = alloc_p2m_page();
> if (!mid_mfn)
> - return false;
> + return -ENOMEM;
>
> p2m_mid_mfn_init(mid_mfn, p2m_missing);
>
> @@ -567,7 +567,7 @@ static bool alloc_p2m(unsigned long pfn)
>
> p2m = alloc_p2m_page();
> if (!p2m)
> - return false;
> + return -ENOMEM;
>
> if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
> p2m_init(p2m);
> @@ -590,8 +590,9 @@ static bool alloc_p2m(unsigned long pfn)
> free_p2m_page(p2m);
> }
>
> - return true;
> + return 0;
> }
> +EXPORT_SYMBOL(xen_alloc_p2m);
>
> unsigned long __init set_phys_range_identity(unsigned long pfn_s,
> unsigned long pfn_e)
> @@ -648,7 +649,10 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
> bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
> {
> if (unlikely(!__set_phys_to_machine(pfn, mfn))) {
> - if (!alloc_p2m(pfn))
> + int ret;
> +
> + ret = xen_alloc_p2m_entry(pfn);
> + if (ret < 0)
> return false;
>
> return __set_phys_to_machine(pfn, mfn);
> --
> 2.1.4
>
next prev parent reply other threads:[~2015-07-24 18:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1437738468-24110-1-git-send-email-david.vrabel@citrix.com>
2015-07-24 11:47 ` [PATCHv2 01/10] mm: memory hotplug with an existing resource David Vrabel
2015-07-24 11:47 ` [PATCHv2 02/10] xen/balloon: remove scratch page left overs David Vrabel
2015-07-24 11:47 ` [PATCHv2 03/10] x86/xen: discard RAM regions above the maximum reservation David Vrabel
2015-07-24 11:47 ` [PATCHv2 04/10] xen/balloon: find non-conflicting regions to place hotplugged memory David Vrabel
2015-07-24 11:47 ` [PATCHv2 05/10] xen/balloon: rationalize memory hotplug stats David Vrabel
2015-07-24 11:47 ` [PATCHv2 06/10] xen/balloon: only hotplug additional memory if required David Vrabel
2015-07-24 11:47 ` [PATCHv2 07/10] xen/balloon: make alloc_xenballoon_pages() always allocate low pages David Vrabel
2015-07-24 11:47 ` [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc David Vrabel
2015-07-24 11:47 ` [PATCHv2 09/10] x86/xen: export xen_alloc_p2m_entry() David Vrabel
2015-07-24 11:47 ` [PATCHv2 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages David Vrabel
[not found] ` <1437738468-24110-10-git-send-email-david.vrabel@citrix.com>
2015-07-24 18:51 ` Konrad Rzeszutek Wilk [this message]
2015-07-29 16:10 ` [PATCHv2 09/10] x86/xen: export xen_alloc_p2m_entry() Daniel Kiper
[not found] ` <1437738468-24110-6-git-send-email-david.vrabel@citrix.com>
2015-07-24 18:54 ` [PATCHv2 05/10] xen/balloon: rationalize memory hotplug stats Konrad Rzeszutek Wilk
2015-07-28 15:22 ` Daniel Kiper
[not found] ` <1437738468-24110-9-git-send-email-david.vrabel@citrix.com>
2015-07-24 18:55 ` [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc Konrad Rzeszutek Wilk
[not found] ` <20150724185545.GD12824@l.oracle.com>
2015-07-27 10:18 ` David Vrabel
[not found] ` <1437738468-24110-11-git-send-email-david.vrabel@citrix.com>
2015-07-24 23:21 ` [PATCHv2 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages Julien Grall
[not found] ` <55B2C882.8050903@citrix.com>
2015-07-27 9:30 ` David Vrabel
[not found] ` <55B5FA39.8000401@citrix.com>
2015-07-27 11:01 ` Julien Grall
[not found] ` <55B60F6E.3040901@citrix.com>
2015-07-27 12:40 ` David Vrabel
2015-07-27 19:37 ` [PATCHv2 00/10] mm, xen/balloon: memory hotplug improvements Daniel Kiper
[not found] ` <1437738468-24110-2-git-send-email-david.vrabel@citrix.com>
2015-07-28 14:54 ` [PATCHv2 01/10] mm: memory hotplug with an existing resource Daniel Kiper
[not found] ` <1437738468-24110-7-git-send-email-david.vrabel@citrix.com>
2015-07-29 15:55 ` [PATCHv2 06/10] xen/balloon: only hotplug additional memory if required Daniel Kiper
[not found] ` <20150729155535.GL3492@olila.local.net-space.pl>
2015-07-29 16:02 ` David Vrabel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='20150724185136.GB12824__16576.9187304706$1437764003$gmane$org@l.oracle.com' \
--to=konrad.wilk@oracle.com \
--cc=boris.ostrovsky@oracle.com \
--cc=daniel.kiper@oracle.com \
--cc=david.vrabel@citrix.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).