File xen.ca9310b24e6205de5387e5982ccd42c35caf89d4.patch of Package xen

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File xen.ca9310b24e6205de5387e5982ccd42c35caf89d4.patch of Package xen

From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 24 May 2019 10:19:59 +0200
Subject: ca9310b24e6205de5387e5982ccd42c35caf89d4

x86/IO-APIC: fix build with gcc9

There are a number of pointless __packed attributes which cause gcc 9 to
legitimately warn:

utils.c: In function 'vtd_dump_iommu_info':
utils.c:287:33: error: converting a packed 'struct IO_APIC_route_entry' pointer (alignment 1) to a 'struct IO_APIC_route_remap_entry' pointer (alignment 8) may result in an unaligned pointer value [-Werror=address-of-packed-member]
  287 |                 remap = (struct IO_APIC_route_remap_entry *) &rte;
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~

intremap.c: In function 'ioapic_rte_to_remap_entry':
intremap.c:343:25: error: converting a packed 'struct IO_APIC_route_entry' pointer (alignment 1) to a 'struct IO_APIC_route_remap_entry' pointer (alignment 8) may result in an unaligned pointer value [-Werror=address-of-packed-member]
  343 |     remap_rte = (struct IO_APIC_route_remap_entry *) old_rte;
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~

Simply drop these attributes. Take the liberty and also re-format the
structure definitions at the same time.

Reported-by: Charles Arnold <carnold@suse.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
 xen/include/asm-x86/io_apic.h | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------------------------------
 1 file changed, 57 insertions(+), 56 deletions(-)

--- a/xen/include/asm-x86/io_apic.h
+++ b/xen/include/asm-x86/io_apic.h
@@ -26,108 +26,109 @@
 #define IO_APIC_REDIR_VECTOR_MASK   0x000FF
 #define IO_APIC_REDIR_DEST_LOGICAL  0x00800
 #define IO_APIC_REDIR_DEST_PHYSICAL 0x00000
 #define IO_APIC_REDIR_SEND_PENDING  (1 << 12)
 #define IO_APIC_REDIR_REMOTE_IRR    (1 << 14)
 #define IO_APIC_REDIR_LEVEL_TRIGGER (1 << 15)
 #define IO_APIC_REDIR_MASKED        (1 << 16)
 
 /*
  * The structure of the IO-APIC:
  */
 union IO_APIC_reg_00 {
-	u32	raw;
-	struct __packed {
-		u32	__reserved_2	: 14,
-			LTS		:  1,
-			delivery_type	:  1,
-			__reserved_1	:  8,
-			ID		:  8;
-	} bits;
+    uint32_t raw;
+    struct {
+        unsigned int __reserved_2:14;
+        unsigned int LTS:1;
+        unsigned int delivery_type:1;
+        unsigned int __reserved_1:8;
+        unsigned int ID:8;
+    } bits;
 };
 
 union IO_APIC_reg_01 {
-	u32	raw;
-	struct __packed {
-		u32	version		:  8,
-			__reserved_2	:  7,
-			PRQ		:  1,
-			entries		:  8,
-			__reserved_1	:  8;
-	} bits;
+    uint32_t raw;
+    struct {
+        unsigned int version:8;
+        unsigned int __reserved_2:7;
+        unsigned int PRQ:1;
+        unsigned int entries:8;
+        unsigned int __reserved_1:8;
+    } bits;
 };
 
 union IO_APIC_reg_02 {
-	u32	raw;
-	struct __packed {
-		u32	__reserved_2	: 24,
-			arbitration	:  4,
-			__reserved_1	:  4;
-	} bits;
+    uint32_t raw;
+    struct {
+        unsigned int __reserved_2:24;
+        unsigned int arbitration:4;
+        unsigned int __reserved_1:4;
+    } bits;
 };
 
 union IO_APIC_reg_03 {
-	u32	raw;
-	struct __packed {
-		u32	boot_DT		:  1,
-			__reserved_1	: 31;
-	} bits;
+    uint32_t raw;
+    struct {
+        unsigned int boot_DT:1;
+        unsigned int __reserved_1:31;
+    } bits;
 };
 
 /*
  * # of IO-APICs and # of IRQ routing registers
  */
 extern int nr_ioapics;
 extern int nr_ioapic_entries[MAX_IO_APICS];
 
 enum ioapic_irq_destination_types {
 	dest_Fixed = 0,
 	dest_LowestPrio = 1,
 	dest_SMI = 2,
 	dest__reserved_1 = 3,
 	dest_NMI = 4,
 	dest_INIT = 5,
 	dest__reserved_2 = 6,
 	dest_ExtINT = 7
 };
 
-struct __packed IO_APIC_route_entry {
-	__u32	vector		:  8,
-		delivery_mode	:  3,	/* 000: FIXED
-					 * 001: lowest prio
-					 * 111: ExtINT
-					 */
-		dest_mode	:  1,	/* 0: physical, 1: logical */
-		delivery_status	:  1,
-		polarity	:  1,
-		irr		:  1,
-		trigger		:  1,	/* 0: edge, 1: level */
-		mask		:  1,	/* 0: enabled, 1: disabled */
-		__reserved_2	: 15;
-
-	union {		struct { __u32
-					__reserved_1	: 24,
-					physical_dest	:  4,
-					__reserved_2	:  4;
-			} physical;
-
-			struct { __u32
-					__reserved_1	: 24,
-					logical_dest	:  8;
-			} logical;
-
-			/* used when Interrupt Remapping with EIM is enabled */
-			__u32 dest32;
-	} dest;
-
+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;
 };
 
 /*
  * MP-BIOS irq configuration table structures:
  */
 
 /* I/O APIC entries */
 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
 
 /* Only need to remap ioapic RTE (reg: 10~3Fh) */
 #define ioapic_reg_remapped(reg) (iommu_intremap && ((reg) >= 0x10))

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