[Xen-devel] [PATCH 14/20] PVH xen: some misc changes like mtrr, intr, msi...

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

Changes in irq.c as PVH doesn't use vlapic emulation. In mtrr we add
assert and set MTRR_TYPEs for PVH.

Changes in V2:
   - Some cleanup of redundant code.
   - time.c: Honor no rdtsc exiting for PVH by setting vtsc to 0 in time.c

Changes in V3:
   - Dont check for pvh in making mmio rangesets readonly.

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
---
 xen/arch/x86/hvm/irq.c      |    3 +++
 xen/arch/x86/hvm/mtrr.c     |   11 +++++++++++
 xen/arch/x86/hvm/vmx/intr.c |    7 ++++---
 xen/arch/x86/time.c         |    9 +++++++++
 4 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
index 9eae5de..92fb245 100644
--- a/xen/arch/x86/hvm/irq.c
+++ b/xen/arch/x86/hvm/irq.c
@@ -405,6 +405,9 @@ struct hvm_intack hvm_vcpu_has_pending_irq(struct vcpu *v)
          && vcpu_info(v, evtchn_upcall_pending) )
         return hvm_intack_vector(plat->irq.callback_via.vector);
 
+    if ( is_pvh_vcpu(v) )
+        return hvm_intack_none;
+
     if ( vlapic_accept_pic_intr(v) && plat->vpic[0].int_output )
         return hvm_intack_pic(0);
 
diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index ef51a8d..f088ce0 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -578,6 +578,9 @@ int32_t hvm_set_mem_pinned_cacheattr(
 {
     struct hvm_mem_pinned_cacheattr_range *range;
 
+    /* PVH note: The guest writes to MSR_IA32_CR_PAT natively */
+    ASSERT( !is_pvh_domain(d) );
+
     if ( !((type == PAT_TYPE_UNCACHABLE) ||
            (type == PAT_TYPE_WRCOMB) ||
            (type == PAT_TYPE_WRTHROUGH) ||
@@ -693,6 +696,14 @@ 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/hvm/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c
index e376f3c..b94f9d5 100644
--- a/xen/arch/x86/hvm/vmx/intr.c
+++ b/xen/arch/x86/hvm/vmx/intr.c
@@ -219,15 +219,16 @@ void vmx_intr_assist(void)
         return;
     }
 
-    /* Crank the handle on interrupt state. */
-    pt_vector = pt_update_irq(v);
+    if ( !is_pvh_vcpu(v) )
+        /* Crank the handle on interrupt state. */
+        pt_vector = pt_update_irq(v);
 
     do {
         intack = hvm_vcpu_has_pending_irq(v);
         if ( likely(intack.source == hvm_intsrc_none) )
             goto out;
 
-        if ( unlikely(nvmx_intr_intercept(v, intack)) )
+        if ( !is_pvh_vcpu(v) && unlikely(nvmx_intr_intercept(v, intack)) )
             goto out;
 
         intblk = hvm_interrupt_blocked(v, intack);
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 6e94847..484eb07 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -1933,6 +1933,15 @@ 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 */
+        dprintk(XENLOG_WARNING,
+                "PVH currently does not support tsc emulation. Setting it "
+                "to no emulation\n");
+        d->arch.vtsc = 0;
+        return;
+    }
 
     switch ( d->arch.tsc_mode = tsc_mode )
     {
-- 
1.7.2.3


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