[Xen-devel] [PATCH v6 11/12] pvh/acpi: Save ACPI registers for PVH guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
Can't generate SCI over event channel during is an event
is enabled and pending:
* v->virq_to_evtchn is not initialized yet (it's done by guest)
* The SCI is sent immediately after event is made pending so it's
  not possible to miss it (at least for the only event that have)


 xen/arch/x86/hvm/pmtimer.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/xen/arch/x86/hvm/pmtimer.c b/xen/arch/x86/hvm/pmtimer.c
index b70c299..e96805e 100644
--- a/xen/arch/x86/hvm/pmtimer.c
+++ b/xen/arch/x86/hvm/pmtimer.c
@@ -22,6 +22,7 @@
 #include <asm/hvm/support.h>
 #include <asm/acpi.h> /* for hvm_acpi_power_button prototype */
 #include <public/hvm/params.h>
+#include <xen/event.h>
 
 /* Slightly more readable port I/O addresses for the registers we intercept */
 #define PM1a_STS_ADDR_V0 (ACPI_PM1A_EVT_BLK_ADDRESS_V0)
@@ -257,7 +258,11 @@ static int acpi_save(struct domain *d, 
hvm_domain_context_t *h)
     int rc;
 
     if ( !has_vpm(d) )
+    {
+        if ( !has_acpi_dm_ff(d) )
+            return hvm_save_entry(PMTIMER, 0, h, acpi);
         return 0;
+    }
 
     spin_lock(&s->lock);
 
@@ -286,7 +291,11 @@ static int acpi_load(struct domain *d, 
hvm_domain_context_t *h)
     PMTState *s = &d->arch.hvm_domain.pl_time->vpmt;
 
     if ( !has_vpm(d) )
+    {
+        if ( !has_acpi_dm_ff(d) )
+            return hvm_load_entry(PMTIMER, h, acpi);
         return -ENODEV;
+    }
 
     spin_lock(&s->lock);
 
-- 
2.7.4


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