[PATCH v3 1/4] x86/ioapic: add a raw field to RTE struct

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Further changes will require access to the full RTE as a single value
in order to pass it to IOMMU interrupt remapping handlers.

No functional change intended.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Changes since v1:
 - Fix initializers.
---
Tested on gitlab CI, builds on all compilers used there.
---
 xen/arch/x86/include/asm/io_apic.h       | 57 +++++++++++++-----------
 xen/arch/x86/io_apic.c                   |  2 +-
 xen/drivers/passthrough/amd/iommu_intr.c |  4 +-
 xen/drivers/passthrough/vtd/intremap.c   |  4 +-
 4 files changed, 35 insertions(+), 32 deletions(-)

diff --git a/xen/arch/x86/include/asm/io_apic.h 
b/xen/arch/x86/include/asm/io_apic.h
index bd8cb95f46b1..4c4777b68a51 100644
--- a/xen/arch/x86/include/asm/io_apic.h
+++ b/xen/arch/x86/include/asm/io_apic.h
@@ -90,35 +90,38 @@ enum ioapic_irq_destination_types {
 };
 
 struct IO_APIC_route_entry {
-    unsigned int vector:8;
-    unsigned int delivery_mode:3; /*
-                                   * 000: FIXED
-                                   * 001: lowest prio
-                                   * 111: ExtINT
-                                   */
-    unsigned int dest_mode:1;     /* 0: physical, 1: logical */
-    unsigned int delivery_status:1;
-    unsigned int polarity:1;      /* 0: low, 1: high */
-    unsigned int irr:1;
-    unsigned int trigger:1;       /* 0: edge, 1: level */
-    unsigned int mask:1;          /* 0: enabled, 1: disabled */
-    unsigned int __reserved_2:15;
-
     union {
         struct {
-            unsigned int __reserved_1:24;
-            unsigned int physical_dest:4;
-            unsigned int __reserved_2:4;
-        } physical;
-
-        struct {
-            unsigned int __reserved_1:24;
-            unsigned int logical_dest:8;
-        } logical;
-
-        /* used when Interrupt Remapping with EIM is enabled */
-        unsigned int dest32;
-    } dest;
+            unsigned int vector:8;
+            unsigned int delivery_mode:3; /*
+                                           * 000: FIXED
+                                           * 001: lowest prio
+                                           * 111: ExtINT
+                                           */
+            unsigned int dest_mode:1;     /* 0: physical, 1: logical */
+            unsigned int delivery_status:1;
+            unsigned int polarity:1;      /* 0: low, 1: high */
+            unsigned int irr:1;
+            unsigned int trigger:1;       /* 0: edge, 1: level */
+            unsigned int mask:1;          /* 0: enabled, 1: disabled */
+            unsigned int __reserved_2:15;
+
+            union {
+                struct {
+                    unsigned int __reserved_1:24;
+                    unsigned int physical_dest:4;
+                    unsigned int __reserved_2:4;
+                } physical;
+
+                struct {
+                    unsigned int __reserved_1:24;
+                    unsigned int logical_dest:8;
+                } logical;
+                unsigned int dest32;
+            } dest;
+        };
+        uint64_t raw;
+    };
 };
 
 /*
diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
index 25a08b1ea6c6..aada2ef96c62 100644
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -2360,7 +2360,7 @@ int ioapic_guest_read(unsigned long physbase, unsigned 
int reg, u32 *pval)
 int ioapic_guest_write(unsigned long physbase, unsigned int reg, u32 val)
 {
     int apic, pin, irq, ret, pirq;
-    struct IO_APIC_route_entry rte = { 0 };
+    struct IO_APIC_route_entry rte = { };
     unsigned long flags;
     struct irq_desc *desc;
 
diff --git a/xen/drivers/passthrough/amd/iommu_intr.c 
b/xen/drivers/passthrough/amd/iommu_intr.c
index f4de09f43180..9e6be3be3515 100644
--- a/xen/drivers/passthrough/amd/iommu_intr.c
+++ b/xen/drivers/passthrough/amd/iommu_intr.c
@@ -352,8 +352,8 @@ static int update_intremap_entry_from_ioapic(
 void cf_check amd_iommu_ioapic_update_ire(
     unsigned int apic, unsigned int reg, unsigned int value)
 {
-    struct IO_APIC_route_entry old_rte = { 0 };
-    struct IO_APIC_route_entry new_rte = { 0 };
+    struct IO_APIC_route_entry old_rte = { };
+    struct IO_APIC_route_entry new_rte = { };
     unsigned int rte_lo = (reg & 1) ? reg - 1 : reg;
     unsigned int pin = (reg - 0x10) / 2;
     int seg, bdf, rc;
diff --git a/xen/drivers/passthrough/vtd/intremap.c 
b/xen/drivers/passthrough/vtd/intremap.c
index b39bc832821a..786388b4d9c7 100644
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -419,7 +419,7 @@ unsigned int cf_check io_apic_read_remap_rte(
 {
     unsigned int ioapic_pin = (reg - 0x10) / 2;
     int index;
-    struct IO_xAPIC_route_entry old_rte = { 0 };
+    struct IO_xAPIC_route_entry old_rte = { };
     int rte_upper = (reg & 1) ? 1 : 0;
     struct vtd_iommu *iommu = ioapic_to_iommu(IO_APIC_ID(apic));
 
@@ -442,7 +442,7 @@ void cf_check io_apic_write_remap_rte(
     unsigned int apic, unsigned int reg, unsigned int value)
 {
     unsigned int ioapic_pin = (reg - 0x10) / 2;
-    struct IO_xAPIC_route_entry old_rte = { 0 };
+    struct IO_xAPIC_route_entry old_rte = { };
     struct IO_APIC_route_remap_entry *remap_rte;
     unsigned int rte_upper = (reg & 1) ? 1 : 0;
     struct vtd_iommu *iommu = ioapic_to_iommu(IO_APIC_ID(apic));
-- 
2.41.0