[Xen-devel] [PATCH 3/5] ARM: ITS: Deny hardware domain access to its

[mjaggi@xxxxxxxxxxxxxxxxxx]

From: Manish Jaggi <mjaggi@xxxxxxxxxx>

This patch extends the gicv3_iomem_deny_access functionality by adding support
for its region as well. Added function gicv3_its_deny_access.

Signed-off-by: Manish Jaggi <mjaggi@xxxxxxxxxx>
---
 xen/arch/arm/gic-v3-its.c        | 19 +++++++++++++++++++
 xen/arch/arm/gic-v3.c            |  7 +++++++
 xen/include/asm-arm/gic_v3_its.h |  8 ++++++++
 3 files changed, 34 insertions(+)

diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c
index c4f1288..f584d33 100644
--- a/xen/arch/arm/gic-v3-its.c
+++ b/xen/arch/arm/gic-v3-its.c
@@ -20,6 +20,7 @@
 
 #include <xen/lib.h>
 #include <xen/delay.h>
+#include <xen/iocap.h>
 #include <xen/libfdt/libfdt.h>
 #include <xen/mm.h>
 #include <xen/rbtree.h>
@@ -905,6 +906,24 @@ struct pending_irq *gicv3_assign_guest_event(struct domain 
*d,
     return pirq;
 }
 
+int gicv3_its_deny_access(const struct domain *d)
+{
+    int rc = 0;
+    unsigned long mfn, nr;
+    const struct host_its *its_data;
+
+    list_for_each_entry(its_data, &host_its_list, entry)
+    {
+        mfn = paddr_to_pfn(its_data->addr);
+        nr = PFN_UP(ACPI_GICV3_ITS_MEM_SIZE);
+        rc = iomem_deny_access(d, mfn, mfn + nr);
+        if ( rc )
+            break;
+    }
+
+    return rc;
+}
+
 /*
  * Create the respective guest DT nodes from a list of host ITSes.
  * This copies the reg property, so the guest sees the ITS at the same address
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 0be8942..045d20d 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1308,6 +1308,13 @@ static int gicv3_iomem_deny_access(const struct domain 
*d)
     if ( rc )
         return rc;
 
+    if ( gicv3_its_host_has_its() )
+    {
+        rc = gicv3_its_deny_access(d);
+        if ( rc )
+            return rc;
+    }
+
     for ( i = 0; i < gicv3.rdist_count; i++ )
     {
         mfn = gicv3.rdist_regions[i].base >> PAGE_SHIFT;
diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h
index b9d8957..a673fba 100644
--- a/xen/include/asm-arm/gic_v3_its.h
+++ b/xen/include/asm-arm/gic_v3_its.h
@@ -139,6 +139,9 @@ void gicv3_its_dt_init(const struct dt_device_node *node);
 int gicv3_its_acpi_init(struct acpi_subtable_header *header,
                                     const unsigned long end);
 #endif
+/* Deny iomem access for its */
+int gicv3_its_deny_access(const struct domain *d);
+
 bool gicv3_its_host_has_its(void);
 
 unsigned int vgic_v3_its_count(const struct domain *d);
@@ -208,6 +211,11 @@ static inline int gicv3_its_acpi_init(struct 
acpi_subtable_header *header,
 }
 #endif
 
+static inline int gicv3_its_deny_access(const struct domain *d)
+{
+    return 0;
+}
+
 static inline bool gicv3_its_host_has_its(void)
 {
     return false;
-- 
2.7.4


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