From: Wei Liu <wei.liu2@citrix.com>
To: xen-devel@lists.xen.org
Cc: Wei Liu <wei.liu2@citrix.com>,
ian.campbell@citrix.com, jbeulich@suse.com,
david.vrabel@citrix.com
Subject: [PATCH V2 03/15] Add evtchn_level in struct domain
Date: Mon, 4 Feb 2013 17:23:46 +0000 [thread overview]
Message-ID: <1359998638-16774-4-git-send-email-wei.liu2@citrix.com> (raw)
In-Reply-To: <1359998638-16774-1-git-send-email-wei.liu2@citrix.com>
This field is manipulated by hypervisor only, so if anything goes wrong it is
a bug.
The default event channel is 2, which has two level lookup structure: a
selector in struct vcpu and a shared bitmap in shared info.
The up coming 3-level event channel utilizes three level lookup structure: a
top level selector and second level selector for every vcpu, and shared
bitmap.
When constructing a domain, it starts with 2-level event channel, which is
guaranteed to be supported by the hypervisor. If a domain wants to use N
(N>=3) level event channel, it must explicitly issue a hypercall to setup
N-level event channel.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
xen/common/event_channel.c | 1 +
xen/include/xen/event.h | 16 +++++++++++++++-
xen/include/xen/sched.h | 1 +
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 3293f91..43ee854 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -1180,6 +1180,7 @@ int evtchn_init(struct domain *d)
clear_page(d->evtchn);
spin_lock_init(&d->event_lock);
+ d->evtchn_level = EVTCHN_DEFAULT_LEVEL;
if ( get_free_port(d) != 0 ) {
free_xenheap_page(d->evtchn);
return -EINVAL;
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index a1574ea..b32b06f 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -20,7 +20,21 @@
#else
#define BITS_PER_EVTCHN_WORD(d) (has_32bit_shinfo(d) ? 32 : BITS_PER_LONG)
#endif
-#define MAX_EVTCHNS(d) (BITS_PER_EVTCHN_WORD(d) * BITS_PER_EVTCHN_WORD(d))
+#define EVTCHN_2_LEVEL 2
+#define EVTCHN_3_LEVEL 3
+#define EVTCHN_DEFAULT_LEVEL EVTCHN_2_LEVEL
+#define MAX_EVTCHNS_L2(d) (BITS_PER_EVTCHN_WORD(d) * BITS_PER_EVTCHN_WORD(d))
+#define MAX_EVTCHNS_L3(d) (MAX_EVTCHNS_L2(d) * BITS_PER_EVTCHN_WORD(d))
+#define MAX_EVTCHNS(d) ({ int __v = 0; \
+ switch ( d->evtchn_level ) { \
+ case EVTCHN_2_LEVEL: \
+ __v = MAX_EVTCHNS_L2(d); break; \
+ case EVTCHN_3_LEVEL: \
+ __v = MAX_EVTCHNS_L3(d); break; \
+ default: \
+ BUG(); \
+ }; \
+ __v;})
#define EVTCHNS_PER_BUCKET 128
#define NR_EVTCHN_BUCKETS (NR_EVENT_CHANNELS / EVTCHNS_PER_BUCKET)
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 45ad6bd..2f18fe5 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -217,6 +217,7 @@ struct domain
/* Event channel information. */
struct evtchn **evtchn;
spinlock_t event_lock;
+ unsigned int evtchn_level;
struct grant_table *grant_table;
--
1.7.10.4
next prev parent reply other threads:[~2013-02-04 17:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-04 17:23 [PATCH V2] Implement 3-level event channel in Xen Wei Liu
2013-02-04 17:23 ` [PATCH V2 01/15] Dynamically allocate d->evtchn Wei Liu
2013-02-04 17:23 ` [PATCH V2 02/15] Move event channel macros / struct definition to proper place Wei Liu
2013-02-04 17:23 ` Wei Liu [this message]
2013-02-04 17:23 ` [PATCH V2 04/15] Bump EVTCHNS_PER_BUCKET to 512 Wei Liu
2013-02-04 17:23 ` [PATCH V2 05/15] Add evtchn_is_{pending, masked} and evtchn_clear_pending Wei Liu
2013-02-04 17:23 ` [PATCH V2 06/15] Introduce some macros for event channels Wei Liu
2013-02-04 17:23 ` [PATCH V2 07/15] Update Xen public header Wei Liu
2013-02-04 17:23 ` [PATCH V2 08/15] Define N-level event channel registration interface Wei Liu
2013-02-04 17:23 ` [PATCH V2 09/15] Add control structures for 3-level event channel Wei Liu
2013-02-04 17:23 ` [PATCH V2 10/15] Make NR_EVTCHN_BUCKETS 3-level ready Wei Liu
2013-02-04 17:23 ` [PATCH V2 11/15] Genneralized event channel operations Wei Liu
2013-02-04 17:23 ` [PATCH V2 12/15] Infrastructure for manipulating 3-level event channel pages Wei Liu
2013-02-04 17:23 ` [PATCH V2 13/15] Implement 3-level event channel routines Wei Liu
2013-02-04 17:23 ` [PATCH V2 14/15] Only allow 3-level event channel on Dom0 and driver domain Wei Liu
2013-02-06 8:28 ` Jan Beulich
2013-02-04 17:23 ` [PATCH V2 15/15] libxl: add evtchn_l3 flag Wei Liu
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