[Xen-devel] [PATCH 6/7] x86/IOMMU: abstract Intel-specific iommu_{en, dis}able_x2apic_IR()

["Jan Beulich" <JBeulich@xxxxxxxx>]

Introduce respective elements in struct iommu_init_ops as well as a
pointer to the main ops structure.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -35,6 +35,8 @@ void print_vtd_entries(struct iommu *iom
 keyhandler_fn_t vtd_dump_iommu_info;
 
 bool intel_iommu_supports_eim(void);
+int intel_iommu_enable_x2apic_IR(void);
+void intel_iommu_disable_x2apic_IR(void);
 
 int enable_qinval(struct iommu *iommu);
 void disable_qinval(struct iommu *iommu);
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -882,23 +882,13 @@ out:
  * This function is used to enable Interrupt remapping when
  * enable x2apic
  */
-int iommu_enable_x2apic_IR(void)
+int intel_iommu_enable_x2apic_IR(void)
 {
     struct acpi_drhd_unit *drhd;
     struct iommu *iommu;
 
-    if ( system_state < SYS_STATE_active )
-    {
-        if ( !intel_iommu_supports_eim() )
-            return -EOPNOTSUPP;
-
-        if ( !platform_supports_x2apic() )
-            return -ENXIO;
-
-        iommu_ops = intel_iommu_ops;
-    }
-    else if ( !x2apic_enabled )
-        return -EOPNOTSUPP;
+    if ( system_state < SYS_STATE_active && !platform_supports_x2apic() )
+        return -ENXIO;
 
     for_each_drhd_unit ( drhd )
     {
@@ -946,14 +936,10 @@ int iommu_enable_x2apic_IR(void)
  * This function is used to disable Interrutp remapping when
  * suspend local apic
  */
-void iommu_disable_x2apic_IR(void)
+void intel_iommu_disable_x2apic_IR(void)
 {
     struct acpi_drhd_unit *drhd;
 
-    /* x2apic_enabled implies iommu_supports_eim(). */
-    if ( !x2apic_enabled )
-        return;
-
     for_each_drhd_unit ( drhd )
         disable_intremap(drhd->iommu);
 
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2720,6 +2720,8 @@ const struct iommu_ops __initconstrel in
     .free_page_table = iommu_free_page_table,
     .reassign_device = reassign_device_ownership,
     .get_device_group_id = intel_iommu_group_id,
+    .enable_x2apic_IR = intel_iommu_enable_x2apic_IR,
+    .disable_x2apic_IR = intel_iommu_disable_x2apic_IR,
     .update_ire_from_apic = io_apic_write_remap_rte,
     .update_ire_from_msi = msi_msg_write_remap_rte,
     .read_apic_from_ire = io_apic_read_remap_rte,
@@ -2736,6 +2738,7 @@ const struct iommu_ops __initconstrel in
 };
 
 const struct iommu_init_ops __initconstrel intel_iommu_init_ops = {
+    .ops = &intel_iommu_ops,
     .setup = vtd_setup,
     .supports_x2apic = intel_iommu_supports_eim,
 };
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -26,6 +26,24 @@
 const struct iommu_init_ops *__initdata iommu_init_ops;
 struct iommu_ops __read_mostly iommu_ops;
 
+int iommu_enable_x2apic_IR(void)
+{
+    if ( system_state < SYS_STATE_active )
+    {
+        if ( !iommu_supports_x2apic() )
+            return -EOPNOTSUPP;
+
+        iommu_ops = *iommu_init_ops->ops;
+    }
+    else if ( !x2apic_enabled )
+        return -EOPNOTSUPP;
+
+    if ( !iommu_ops.enable_x2apic_IR )
+        return -EOPNOTSUPP;
+
+    return iommu_ops.enable_x2apic_IR();
+}
+
 void iommu_update_ire_from_apic(
     unsigned int apic, unsigned int reg, unsigned int value)
 {
--- a/xen/include/asm-x86/apic.h
+++ b/xen/include/asm-x86/apic.h
@@ -29,7 +29,6 @@ enum apic_mode {
 };
 
 extern u8 apic_verbosity;
-extern bool x2apic_enabled;
 extern bool directed_eoi_enabled;
 
 void check_x2apic_preenabled(void);
--- a/xen/include/asm-x86/apicdef.h
+++ b/xen/include/asm-x86/apicdef.h
@@ -126,4 +126,6 @@
 
 #define MAX_IO_APICS 128
 
+extern bool x2apic_enabled;
+
 #endif
--- a/xen/include/asm-x86/iommu.h
+++ b/xen/include/asm-x86/iommu.h
@@ -17,6 +17,7 @@
 #include <xen/errno.h>
 #include <xen/list.h>
 #include <xen/spinlock.h>
+#include <asm/apicdef.h>
 #include <asm/processor.h>
 #include <asm/hvm/vmx/vmcs.h>
 
@@ -65,6 +66,7 @@ static inline const struct iommu_ops *io
 }
 
 struct iommu_init_ops {
+    const struct iommu_ops *ops;
     int (*setup)(void);
     bool (*supports_x2apic)(void);
 };
@@ -97,7 +99,12 @@ static inline bool iommu_supports_x2apic
 }
 
 int iommu_enable_x2apic_IR(void);
-void iommu_disable_x2apic_IR(void);
+
+static inline void iommu_disable_x2apic_IR(void)
+{
+    if ( x2apic_enabled && iommu_ops.disable_x2apic_IR )
+        iommu_ops.disable_x2apic_IR();
+}
 
 extern bool untrusted_msi;
 
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -216,11 +216,16 @@ struct iommu_ops {
                                     unsigned int *flags);
 
     void (*free_page_table)(struct page_info *);
+
 #ifdef CONFIG_X86
+    int (*enable_x2apic_IR)(void);
+    void (*disable_x2apic_IR)(void);
+
     void (*update_ire_from_apic)(unsigned int apic, unsigned int reg, unsigned 
int value);
     unsigned int (*read_apic_from_ire)(unsigned int apic, unsigned int reg);
     int (*setup_hpet_msi)(struct msi_desc *);
 #endif /* CONFIG_X86 */
+
     int __must_check (*suspend)(void);
     void (*resume)(void);
     void (*share_p2m)(struct domain *d);




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