# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1250696254 -3600
# Node ID ca4db4ff9101f51d89a3de9e756b8a2f90a2baf2
# Parent 5aacaeffd6f59838a947824f5b2e56c2849fa0d0
x86: extend runstate area updates
In order to give guests a hint at whether their vCPU-s are currently
scheduled (so they can e.g. adapt their behavior in spin loops),
update
the run state area (if registered) also when de-scheduling a vCPU.
Also fix an oversight in the compat mode implementation of
VCPUOP_register_runstate_memory_area.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
xen-unstable changeset: 20077:456b4ec00244
xen-unstable date: Wed Aug 19 13:01:41 2009 +0100
---
xen/arch/x86/domain.c | 40 +++++++++++++++++++++++++---------------
xen/arch/x86/x86_64/domain.c | 2 +-
2 files changed, 26 insertions(+), 16 deletions(-)
diff -r 5aacaeffd6f5 -r ca4db4ff9101 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Wed Aug 19 16:36:34 2009 +0100
+++ b/xen/arch/x86/domain.c Wed Aug 19 16:37:34 2009 +0100
@@ -1219,6 +1219,26 @@ static void paravirt_ctxt_switch_to(stru
}
}
+/* Update per-VCPU guest runstate shared memory area (if registered). */
+static void update_runstate_area(struct vcpu *v)
+{
+ if ( guest_handle_is_null(runstate_guest(v)) )
+ return;
+
+#ifdef CONFIG_COMPAT
+ if ( is_pv_32on64_domain(v->domain) )
+ {
+ struct compat_vcpu_runstate_info info;
+
+ XLAT_vcpu_runstate_info(&info, &v->runstate);
+ __copy_to_guest(v->runstate_guest.compat, &info, 1);
+ return;
+ }
+#endif
+
+ __copy_to_guest(runstate_guest(v), &v->runstate, 1);
+}
+
static inline int need_full_gdt(struct vcpu *v)
{
return (!is_hvm_vcpu(v) && !is_idle_vcpu(v));
@@ -1311,6 +1331,9 @@ void context_switch(struct vcpu *prev, s
flush_tlb_mask(dirty_mask);
}
+ if (prev != next)
+ update_runstate_area(prev);
+
if ( is_hvm_vcpu(prev) && !list_empty(&prev->arch.hvm_vcpu.tm_list) )
pt_save_timer(prev);
@@ -1350,21 +1373,8 @@ void context_switch(struct vcpu *prev, s
context_saved(prev);
- /* Update per-VCPU guest runstate shared memory area (if registered). */
- if ( !guest_handle_is_null(runstate_guest(next)) )
- {
- if ( !is_pv_32on64_domain(next->domain) )
- __copy_to_guest(runstate_guest(next), &next->runstate, 1);
-#ifdef CONFIG_COMPAT
- else
- {
- struct compat_vcpu_runstate_info info;
-
- XLAT_vcpu_runstate_info(&info, &next->runstate);
- __copy_to_guest(next->runstate_guest.compat, &info, 1);
- }
-#endif
- }
+ if (prev != next)
+ update_runstate_area(next);
schedule_tail(next);
BUG();
diff -r 5aacaeffd6f5 -r ca4db4ff9101 xen/arch/x86/x86_64/domain.c
--- a/xen/arch/x86/x86_64/domain.c Wed Aug 19 16:36:34 2009 +0100
+++ b/xen/arch/x86/x86_64/domain.c Wed Aug 19 16:37:34 2009 +0100
@@ -56,7 +56,7 @@ arch_compat_vcpu_op(
struct vcpu_runstate_info runstate;
vcpu_runstate_get(v, &runstate);
- XLAT_vcpu_runstate_info(&info, &v->runstate);
+ XLAT_vcpu_runstate_info(&info, &runstate);
}
__copy_to_guest(v->runstate_guest.compat, &info, 1);
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