[V11 PATCH 15/21] PVH xen: mtrr, tsc, timers, grant changes...

[Mukesh Rathor <mukesh.rathor@oracle.com>]

PVH only supports limited memory types in Phase I. TSC is limited to
native mode only also for the moment. Finally, grant mapping of iomem
for PVH hasn't been explored in phase I.

Changes in V10:
  - don't migrate timers for PVH as it doesn't use rtc or emulated timers.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Acked-by: Keir Fraser <keir@xen.org>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Tim Deegan <tim@xen.org>
PV-HVM-Regression-Tested-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
 xen/arch/x86/hvm/hvm.c   |    4 ++++
 xen/arch/x86/hvm/mtrr.c  |    8 ++++++++
 xen/arch/x86/time.c      |    8 ++++++++
 xen/common/grant_table.c |    4 ++--
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index bac4708..93aa42c 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -301,6 +301,10 @@ u64 hvm_get_guest_tsc_adjust(struct vcpu *v)
 
 void hvm_migrate_timers(struct vcpu *v)
 {
+    /* PVH doesn't use rtc and emulated timers, it uses pvclock mechanism. */
+    if ( is_pvh_vcpu(v) )
+        return;
+
     rtc_migrate_timers(v);
     pt_migrate(v);
 }
diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index ef51a8d..b9d6411 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -693,6 +693,14 @@ uint8_t epte_get_entry_emt(struct domain *d, unsigned long gfn, mfn_t mfn,
          ((d->vcpu == NULL) || ((v = d->vcpu[0]) == NULL)) )
         return MTRR_TYPE_WRBACK;
 
+    /* PVH fixme: Add support for more memory types. */
+    if ( is_pvh_domain(d) )
+    {
+        if ( direct_mmio )
+            return MTRR_TYPE_UNCACHABLE;
+        return MTRR_TYPE_WRBACK;
+    }
+
     if ( !v->domain->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] )
         return MTRR_TYPE_WRBACK;
 
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index f047cb3..4589d43 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -1891,6 +1891,14 @@ void tsc_set_info(struct domain *d,
         d->arch.vtsc = 0;
         return;
     }
+    if ( is_pvh_domain(d) && tsc_mode != TSC_MODE_NEVER_EMULATE )
+    {
+        /* PVH fixme: support more tsc modes. */
+        printk(XENLOG_WARNING
+               "PVH currently does not support tsc emulation. Setting timer_mode = native\n");
+        d->arch.vtsc = 0;
+        return;
+    }
 
     switch ( d->arch.tsc_mode = tsc_mode )
     {
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index eb50288..c51da30 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -721,7 +721,7 @@ __gnttab_map_grant_ref(
 
     double_gt_lock(lgt, rgt);
 
-    if ( !is_hvm_domain(ld) && need_iommu(ld) )
+    if ( is_pv_domain(ld) && need_iommu(ld) )
     {
         unsigned int wrc, rdc;
         int err = 0;
@@ -932,7 +932,7 @@ __gnttab_unmap_common(
             act->pin -= GNTPIN_hstw_inc;
     }
 
-    if ( !is_hvm_domain(ld) && need_iommu(ld) )
+    if ( is_pv_domain(ld) && need_iommu(ld) )
     {
         unsigned int wrc, rdc;
         int err = 0;
-- 
1.7.2.3