[Xen-devel] [PATCH 11/18 V2]: 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

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
---
 xen/arch/x86/hvm/irq.c      |    3 +++
 xen/arch/x86/hvm/mtrr.c     |   10 ++++++++++
 xen/arch/x86/hvm/vmx/intr.c |    7 ++++---
 xen/arch/x86/msi.c          |    9 +++++++--
 xen/arch/x86/time.c         |    2 +-
 5 files changed, 25 insertions(+), 6 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..8057e88 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 +696,13 @@ 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/help: do I have this correct? */
+    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/msi.c b/xen/arch/x86/msi.c
index 8804306..0fe3108 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -787,10 +787,15 @@ static int msix_capability_init(struct pci_dev *dev,
 
     if ( !dev->msix_used_entries )
     {
-        if ( rangeset_add_range(mmio_ro_ranges, dev->msix_table.first,
+        /* PVH: this is temporary only until linux msi.c is fixed. See 
xen-devel
+         * thread: "[PVH]: Help: msi.c".
+         */
+        if ( !is_pvh_domain(dev->domain) &&
+             rangeset_add_range(mmio_ro_ranges, dev->msix_table.first,
                                 dev->msix_table.last) )
             WARN();
-        if ( rangeset_add_range(mmio_ro_ranges, dev->msix_pba.first,
+        if ( !is_pvh_domain(dev->domain) &&
+             rangeset_add_range(mmio_ro_ranges, dev->msix_pba.first,
                                 dev->msix_pba.last) )
             WARN();
 
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 56bffdb..eaa1989 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -1879,7 +1879,7 @@ void tsc_set_info(struct domain *d,
                   uint32_t tsc_mode, uint64_t elapsed_nsec,
                   uint32_t gtsc_khz, uint32_t incarnation)
 {
-    if ( is_idle_domain(d) || (d->domain_id == 0) )
+    if ( is_idle_domain(d) || (d->domain_id == 0) || is_pvh_domain(d) )
     {
         d->arch.vtsc = 0;
         return;
-- 
1.7.2.3


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