[Xen-devel] [PATCH 7/8] viridian: stop directly calling viridian_time_ref_count_freeze/thaw()...

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

...from arch_domain_shutdown/pause/unpause().

A subsequent patch will introduce an implementaion of synthetic timers
which will also need freeze/thaw hooks, so make the exported hooks more
generic and call through to (re-named and static) time_ref_count_freeze/thaw
functions.

NOTE: This patch also introduces a new time_ref_count() helper to return
      the current counter value. This is currently only used by the MSR
      read handler but the synthetic timer code will also need to use it.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/domain.c              | 12 ++++++------
 xen/arch/x86/hvm/viridian/time.c   | 24 +++++++++++++++++++++---
 xen/include/asm-x86/hvm/viridian.h |  4 ++--
 3 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 32dc4253ff..ed2a57a8a6 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -658,20 +658,20 @@ void arch_domain_destroy(struct domain *d)
 
 void arch_domain_shutdown(struct domain *d)
 {
-    if ( has_viridian_time_ref_count(d) )
-        viridian_time_ref_count_freeze(d);
+    if ( is_viridian_domain(d) )
+        viridian_time_domain_freeze(d);
 }
 
 void arch_domain_pause(struct domain *d)
 {
-    if ( has_viridian_time_ref_count(d) )
-        viridian_time_ref_count_freeze(d);
+    if ( is_viridian_domain(d) )
+        viridian_time_domain_freeze(d);
 }
 
 void arch_domain_unpause(struct domain *d)
 {
-    if ( has_viridian_time_ref_count(d) )
-        viridian_time_ref_count_thaw(d);
+    if ( is_viridian_domain(d) )
+        viridian_time_domain_thaw(d);
 }
 
 int arch_domain_soft_reset(struct domain *d)
diff --git a/xen/arch/x86/hvm/viridian/time.c b/xen/arch/x86/hvm/viridian/time.c
index e8924adfa1..cb7162c2d4 100644
--- a/xen/arch/x86/hvm/viridian/time.c
+++ b/xen/arch/x86/hvm/viridian/time.c
@@ -91,7 +91,7 @@ static int64_t raw_trc_val(struct domain *d)
     return scale_delta(tsc, &tsc_to_ns) / 100ul;
 }
 
-void viridian_time_ref_count_freeze(struct domain *d)
+static void time_ref_count_freeze(struct domain *d)
 {
     struct viridian_time_ref_count *trc =
         &d->arch.hvm.viridian->time_ref_count;
@@ -100,7 +100,7 @@ void viridian_time_ref_count_freeze(struct domain *d)
         trc->val = raw_trc_val(d) + trc->off;
 }
 
-void viridian_time_ref_count_thaw(struct domain *d)
+static void time_ref_count_thaw(struct domain *d)
 {
     struct viridian_time_ref_count *trc =
         &d->arch.hvm.viridian->time_ref_count;
@@ -110,6 +110,24 @@ void viridian_time_ref_count_thaw(struct domain *d)
         trc->off = (int64_t)trc->val - raw_trc_val(d);
 }
 
+static int64_t time_ref_count(struct domain *d)
+{
+    struct viridian_time_ref_count *trc =
+        &d->arch.hvm.viridian->time_ref_count;
+
+    return raw_trc_val(d) + trc->off;
+}
+
+void viridian_time_domain_freeze(struct domain *d)
+{
+    time_ref_count_freeze(d);
+}
+
+void viridian_time_domain_thaw(struct domain *d)
+{
+    time_ref_count_thaw(d);
+}
+
 int viridian_time_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
 {
     struct domain *d = v->domain;
@@ -179,7 +197,7 @@ int viridian_time_rdmsr(const struct vcpu *v, uint32_t idx, 
uint64_t *val)
             printk(XENLOG_G_INFO "d%d: VIRIDIAN MSR_TIME_REF_COUNT: 
accessed\n",
                    d->domain_id);
 
-        *val = raw_trc_val(d) + trc->off;
+        *val = time_ref_count(d);
         break;
     }
 
diff --git a/xen/include/asm-x86/hvm/viridian.h 
b/xen/include/asm-x86/hvm/viridian.h
index 6d40d391e1..9a493cf048 100644
--- a/xen/include/asm-x86/hvm/viridian.h
+++ b/xen/include/asm-x86/hvm/viridian.h
@@ -97,8 +97,8 @@ int guest_rdmsr_viridian(const struct vcpu *v, uint32_t idx, 
uint64_t *val);
 int
 viridian_hypercall(struct cpu_user_regs *regs);
 
-void viridian_time_ref_count_freeze(struct domain *d);
-void viridian_time_ref_count_thaw(struct domain *d);
+void viridian_time_domain_freeze(struct domain *d);
+void viridian_time_domain_thaw(struct domain *d);
 
 int viridian_vcpu_init(struct vcpu *v);
 int viridian_domain_init(struct domain *d);
-- 
2.20.1.2.gb21ebb671


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