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From: Benjamin Sanda <ben.sanda@dornerworks.com>
To: xen-devel@lists.xenproject.org
Cc: Keir Fraser <keir@xen.org>, bensanda <ben.sanda@dornerworks.com>,
	Tim Deegan <tim@xen.org>,
	Dario Faggioli <dario.faggioli@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Jan Beulich <jbeulich@suse.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Paul Sujkov <psujkov@gmail.com>
Subject: [PATCH 3/6] xentrace: P2M lookup suport for ARM platform
Date: Wed, 16 Mar 2016 13:51:36 -0700	[thread overview]
Message-ID: <1458161499-15313-4-git-send-email-ben.sanda@dornerworks.com> (raw)
In-Reply-To: <1458161499-15313-1-git-send-email-ben.sanda@dornerworks.com>

From: bensanda <ben.sanda@dornerworks.com>

Modified p2m_lookup() to provide support for xentrace on the ARM platform. Added check for DOMID_XEN which skips PFN to MFN translation. xentrace sends a MFN dirrectly when requesting DOMID_XEN, so no translation is needed. Also sets page memory type, p2m_type_t, to p2m_ram_rw to provide correct access.

Signed-off-by: Benjamin Sanda <ben.sanda@dornerworks.com>
---
 xen/arch/arm/p2m.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index a2a9c4b..2e7da43 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -228,10 +228,21 @@ paddr_t p2m_lookup(struct domain *d, paddr_t paddr, p2m_type_t *t)
     paddr_t ret;
     struct p2m_domain *p2m = &d->arch.p2m;
 
-    spin_lock(&p2m->lock);
-    ret = __p2m_lookup(d, paddr, t);
-    spin_unlock(&p2m->lock);
-
+    /* Check for DOMID_XEN: If we are called with DOMID_XEN (from xentrace)
+    then paddr is already a MFN and no translation is needed. We only set the 
+    page type as p2m_raw_rw and return the MFN directly */
+    if(DOMID_XEN != d->domain_id)
+    {
+        spin_lock(&p2m->lock);
+        ret = __p2m_lookup(d, paddr, t);
+        spin_unlock(&p2m->lock);
+    }
+    else
+    {
+        *t = p2m_ram_rw;
+        ret = paddr;
+    }
+    
     return ret;
 }
 
-- 
2.7.2


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  parent reply	other threads:[~2016-03-16 20:52 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-16 20:51 [PATCH 0/6] xentrace/xenalyze support on ARM Benjamin Sanda
2016-03-16 20:51 ` [PATCH 1/6] Flask: Support for ARM xentrace Benjamin Sanda
2016-03-17 14:56   ` Julien Grall
2016-03-17 15:03   ` Julien Grall
2016-03-25 19:27   ` Konrad Rzeszutek Wilk
2016-03-28 15:52     ` Ben Sanda
2016-03-16 20:51 ` [PATCH 2/6] xenalyze: Support for ARM platform Benjamin Sanda
2016-03-16 20:59   ` Andrew Cooper
2016-03-17 10:39     ` George Dunlap
2016-03-16 20:51 ` Benjamin Sanda [this message]
2016-03-17 16:21   ` [PATCH 3/6] xentrace: P2M lookup suport " Julien Grall
2016-03-28 18:55     ` Ben Sanda
2016-03-30 18:38       ` Julien Grall
2016-03-16 20:51 ` [PATCH 4/6] xentrace: ARM platform DOMID_XEN mapping support Benjamin Sanda
2016-03-17 15:53   ` Julien Grall
2016-03-16 20:51 ` [PATCH 5/6] xentrace: Trace buffer support for ARM platform Benjamin Sanda
2016-03-16 20:51 ` [PATCH 6/6] xentrace: ARM platform timestamp support Benjamin Sanda
2016-03-25 19:31   ` Konrad Rzeszutek Wilk
2016-03-31 16:38     ` Stefano Stabellini
2016-03-31 16:44       ` Ben Sanda
2016-04-01 13:05         ` Stefano Stabellini
2016-03-17 15:00 ` [PATCH 0/6] xentrace/xenalyze support on ARM Julien Grall
2016-03-17 16:50   ` Ben Sanda
2016-03-17 17:01     ` Julien Grall
2016-03-17 17:04       ` Ben Sanda
2016-03-18 17:12         ` Wei Liu
2016-03-17 17:23 ` George Dunlap

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