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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 5/5] xen: remove evtchn_upcall_mask from interface on ARM
On ARM event-channel upcalls are masked using the hardware's interrupt mask
bit and not by a software bit.
Leaving this field present in the interface has caused some confusion already
and is liable to mean it gets inadvertently used in the future. So arrange for
this field to be turned into a padding field on ARM by introducing a
XEN_HAVE_PV_UPCALL_MASK define.
This bit is also unused for x86 PV-on-HVM guests, but we can't realistically
distinguish those from x86 PV guests in the headers.
Add a per-arch vcpu_event_delivery_is_enabled function to replace an open
coded use of evtchn_upcall_mask in common code (in a debug keyhandler). The
existing local_event_delivery_is_enabled, which operates only on current, was
unimplemented on ARM and unused on x86, so remove it.
ifdef the use of evtchn_upcall_mask when setting up a new vcpu info page.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: keir@xxxxxxx
Cc: jbeulich@xxxxxxxx
---
v6: move compat #define into x86 config.h to remove it from public header,
fixup new usage of upcall mask in common code.
---
xen/common/domain.c | 2 ++
xen/common/keyhandler.c | 2 +-
xen/include/asm-arm/event.h | 13 +++++++------
xen/include/asm-x86/config.h | 1 +
xen/include/asm-x86/event.h | 10 +++++-----
xen/include/public/arch-x86/xen.h | 2 ++
xen/include/public/xen.h | 4 ++++
7 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 6c264a5..9390a22 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -921,7 +921,9 @@ int map_vcpu_info(struct vcpu *v, unsigned long gfn,
unsigned offset)
if ( v->vcpu_info == &dummy_vcpu_info )
{
memset(new_info, 0, sizeof(*new_info));
+#ifdef XEN_HAVE_PV_UPCALL_MASK
__vcpu_info(v, new_info, evtchn_upcall_mask) = 1;
+#endif
}
else
{
diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 5072133..5725f90 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -293,7 +293,7 @@ static void dump_domains(unsigned char key)
v->vcpu_id, v->processor,
v->is_running ? 'T':'F', v->poll_evtchn,
vcpu_info(v, evtchn_upcall_pending),
- vcpu_info(v, evtchn_upcall_mask));
+ !vcpu_event_delivery_is_enabled(v));
cpuset_print(tmpstr, sizeof(tmpstr), v->vcpu_dirty_cpumask);
printk("dirty_cpus=%s ", tmpstr);
cpuset_print(tmpstr, sizeof(tmpstr), v->cpu_affinity);
diff --git a/xen/include/asm-arm/event.h b/xen/include/asm-arm/event.h
index ed05901..04d854f 100644
--- a/xen/include/asm-arm/event.h
+++ b/xen/include/asm-arm/event.h
@@ -7,6 +7,12 @@
void vcpu_kick(struct vcpu *v);
void vcpu_mark_events_pending(struct vcpu *v);
+static inline int vcpu_event_delivery_is_enabled(struct vcpu *v)
+{
+ struct cpu_user_regs *regs = &v->arch.cpu_info->guest_cpu_user_regs;
+ return !(regs->cpsr & PSR_IRQ_MASK);
+}
+
static inline int local_events_need_delivery_nomask(void)
{
struct pending_irq *p = irq_to_pending(current, VGIC_IRQ_EVTCHN_CALLBACK);
@@ -31,16 +37,11 @@ static inline int local_events_need_delivery_nomask(void)
static inline int local_events_need_delivery(void)
{
- struct cpu_user_regs *regs = guest_cpu_user_regs();
-
- /* guest IRQs are masked */
- if ( (regs->cpsr & PSR_IRQ_MASK) )
+ if ( !vcpu_event_delivery_is_enabled(current) )
return 0;
return local_events_need_delivery_nomask();
}
-int local_event_delivery_is_enabled(void);
-
static inline void local_event_delivery_enable(void)
{
struct cpu_user_regs *regs = guest_cpu_user_regs();
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index 5d79593..0e6354c 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -265,6 +265,7 @@ extern unsigned char boot_edid_info[128];
#define COMPAT_LEGACY_MAX_VCPUS XEN_LEGACY_MAX_VCPUS
#define COMPAT_HAVE_PV_GUEST_ENTRY XEN_HAVE_PV_GUEST_ENTRY
+#define COMPAT_HAVE_PV_UPCALL_MASK XEN_HAVE_PV_UPCALL_MASK
#endif
diff --git a/xen/include/asm-x86/event.h b/xen/include/asm-x86/event.h
index 06057c7..7edeb5b 100644
--- a/xen/include/asm-x86/event.h
+++ b/xen/include/asm-x86/event.h
@@ -14,6 +14,11 @@
void vcpu_kick(struct vcpu *v);
void vcpu_mark_events_pending(struct vcpu *v);
+static inline int vcpu_event_delivery_is_enabled(struct vcpu *v)
+{
+ return !vcpu_info(v, evtchn_upcall_mask);
+}
+
int hvm_local_events_need_delivery(struct vcpu *v);
static inline int local_events_need_delivery(void)
{
@@ -23,11 +28,6 @@ static inline int local_events_need_delivery(void)
!vcpu_info(v, evtchn_upcall_mask)));
}
-static inline int local_event_delivery_is_enabled(void)
-{
- return !vcpu_info(current, evtchn_upcall_mask);
-}
-
static inline void local_event_delivery_disable(void)
{
vcpu_info(current, evtchn_upcall_mask) = 1;
diff --git a/xen/include/public/arch-x86/xen.h
b/xen/include/public/arch-x86/xen.h
index 7ae8c90..908ef87 100644
--- a/xen/include/public/arch-x86/xen.h
+++ b/xen/include/public/arch-x86/xen.h
@@ -72,6 +72,8 @@ typedef unsigned long xen_pfn_t;
#define XEN_HAVE_PV_GUEST_ENTRY 1
+#define XEN_HAVE_PV_UPCALL_MASK 1
+
/*
* `incontents 200 segdesc Segment Descriptor Tables
*/
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 037540d..2a40970 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -612,7 +612,11 @@ struct vcpu_info {
* to block: this avoids wakeup-waiting races.
*/
uint8_t evtchn_upcall_pending;
+#ifdef XEN_HAVE_PV_UPCALL_MASK
uint8_t evtchn_upcall_mask;
+#else /* XEN_HAVE_PV_UPCALL_MASK */
+ uint8_t pad0;
+#endif /* XEN_HAVE_PV_UPCALL_MASK */
xen_ulong_t evtchn_pending_sel;
struct arch_vcpu_info arch;
struct vcpu_time_info time;
--
1.7.2.5
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