[Xen-devel] [PATCH v3 13/32] xen/x86: allow disabling the emulated HPET

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hpet.c | 13 +++++++++++++
 xen/arch/x86/hvm/hvm.c  |  1 -
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/hpet.c b/xen/arch/x86/hvm/hpet.c
index 732504a..9773034 100644
--- a/xen/arch/x86/hvm/hpet.c
+++ b/xen/arch/x86/hvm/hpet.c
@@ -517,6 +517,9 @@ static int hpet_save(struct domain *d, hvm_domain_context_t 
*h)
     int rc;
     uint64_t guest_time;
 
+    if ( !has_vhpet(d) )
+        return 0;
+
     write_lock(&hp->lock);
     guest_time = guest_time_hpet(hp);
 
@@ -576,6 +579,9 @@ static int hpet_load(struct domain *d, hvm_domain_context_t 
*h)
     uint64_t guest_time;
     int i;
 
+    if ( !has_vhpet(d) )
+        return 0;
+
     write_lock(&hp->lock);
 
     /* Reload the HPET registers */
@@ -634,6 +640,9 @@ void hpet_init(struct domain *d)
     HPETState *h = domain_vhpet(d);
     int i;
 
+    if ( !has_vhpet(d) )
+        return;
+
     memset(h, 0, sizeof(HPETState));
 
     rwlock_init(&h->lock);
@@ -661,6 +670,7 @@ void hpet_init(struct domain *d)
     }
 
     register_mmio_handler(d, &hpet_mmio_ops);
+    d->arch.hvm_domain.params[HVM_PARAM_HPET_ENABLED] = 1;
 }
 
 void hpet_deinit(struct domain *d)
@@ -668,6 +678,9 @@ void hpet_deinit(struct domain *d)
     int i;
     HPETState *h = domain_vhpet(d);
 
+    if ( !has_vhpet(d) )
+        return;
+
     write_lock(&h->lock);
 
     if ( hpet_enabled(h) )
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 901f9a8..9c6e7fd 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1547,7 +1547,6 @@ int hvm_domain_initialise(struct domain *d)
 
     hvm_init_guest_time(d);
 
-    d->arch.hvm_domain.params[HVM_PARAM_HPET_ENABLED] = 1;
     d->arch.hvm_domain.params[HVM_PARAM_TRIPLE_FAULT_REASON] = SHUTDOWN_reboot;
 
     vpic_init(d);
-- 
1.9.5 (Apple Git-50.3)


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