qubes-linux-kernel/patches.xen/xen3-patch-2.6.18

From: www.kernel.org
Subject: Linux 2.6.18
Patch-mainline: 2.6.18

Automatically created from "patches.kernel.org/patch-2.6.18" by xen-port-patches.py

Acked-by: jbeulich@novell.com

--- head-2011-03-17.orig/arch/x86/Kconfig	2011-01-31 17:01:38.000000000 +0100
+++ head-2011-03-17/arch/x86/Kconfig	2011-01-31 17:02:29.000000000 +0100
@@ -83,7 +83,6 @@ config ARCH_DEFCONFIG
 
 config GENERIC_CMOS_UPDATE
 	def_bool y
-	depends on !X86_XEN
 
 config CLOCKSOURCE_WATCHDOG
 	def_bool y
@@ -1609,7 +1608,7 @@ config KEXEC_JUMP
 	  code in physical address mode via KEXEC
 
 config PHYSICAL_START
-	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
+	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP || XEN)
 	default "0x1000000"
 	---help---
 	  This gives the physical address where the kernel is loaded.
--- head-2011-03-17.orig/arch/x86/kernel/Makefile	2011-01-31 14:53:50.000000000 +0100
+++ head-2011-03-17/arch/x86/kernel/Makefile	2011-01-31 17:02:29.000000000 +0100
@@ -129,5 +129,5 @@ ifeq ($(CONFIG_X86_64),y)
 	pci-dma_64-$(CONFIG_XEN)	+= pci-dma_32.o
 endif
 
-disabled-obj-$(CONFIG_XEN) := i8259_$(BITS).o reboot.o smpboot_$(BITS).o
+disabled-obj-$(CONFIG_XEN) := i8253.o i8259_$(BITS).o reboot.o smpboot_$(BITS).o tsc_$(BITS).o
 %/head_$(BITS).o %/head_$(BITS).s: $(if $(CONFIG_XEN),EXTRA_AFLAGS,dummy) :=
--- head-2011-03-17.orig/arch/x86/kernel/process_64-xen.c	2008-08-07 12:44:36.000000000 +0200
+++ head-2011-03-17/arch/x86/kernel/process_64-xen.c	2011-02-02 08:28:34.000000000 +0100
@@ -50,7 +50,6 @@
 #include <asm/pda.h>
 #include <asm/prctl.h>
 #include <asm/kdebug.h>
-#include <xen/interface/platform.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/vcpu.h>
 #include <asm/desc.h>
--- head-2011-03-17.orig/arch/x86/kernel/setup64-xen.c	2008-01-28 12:24:19.000000000 +0100
+++ head-2011-03-17/arch/x86/kernel/setup64-xen.c	2011-01-31 17:02:29.000000000 +0100
@@ -363,5 +363,7 @@ void __cpuinit cpu_init (void)
 
 	fpu_init(); 
 
-	raw_local_save_flags(kernel_eflags);
+	asm ("pushfq; popq %0" : "=rm" (kernel_eflags));
+	if (raw_irqs_disabled())
+		kernel_eflags &= ~X86_EFLAGS_IF;
 }
--- head-2011-03-17.orig/arch/x86/kernel/time-xen.c	2010-08-31 09:24:21.000000000 +0200
+++ head-2011-03-17/arch/x86/kernel/time-xen.c	2011-01-31 17:02:29.000000000 +0100
@@ -45,7 +45,6 @@
 #include <linux/sysdev.h>
 #include <linux/bcd.h>
 #include <linux/efi.h>
-#include <linux/mca.h>
 #include <linux/sysctl.h>
 #include <linux/percpu.h>
 #include <linux/kernel_stat.h>
@@ -76,8 +75,13 @@
 
 #if defined (__i386__)
 #include <asm/i8259.h>
+#include <asm/i8253.h>
+DEFINE_SPINLOCK(i8253_lock);
+EXPORT_SYMBOL(i8253_lock);
 #endif
 
+#define XEN_SHIFT 22
+
 int pit_latch_buggy;              /* extern */
 
 #if defined(__x86_64__)
@@ -97,10 +101,6 @@ extern unsigned long wall_jiffies;
 DEFINE_SPINLOCK(rtc_lock);
 EXPORT_SYMBOL(rtc_lock);
 
-extern struct init_timer_opts timer_tsc_init;
-extern struct timer_opts timer_tsc;
-#define timer_none timer_tsc
-
 /* These are peridically updated in shared_info, and then copied here. */
 struct shadow_time_info {
 	u64 tsc_timestamp;     /* TSC at last update of time vals.  */
@@ -172,24 +172,6 @@ static int __init __permitted_clock_jitt
 }
 __setup("permitted_clock_jitter=", __permitted_clock_jitter);
 
-#if 0
-static void delay_tsc(unsigned long loops)
-{
-	unsigned long bclock, now;
-
-	rdtscl(bclock);
-	do {
-		rep_nop();
-		rdtscl(now);
-	} while ((now - bclock) < loops);
-}
-
-struct timer_opts timer_tsc = {
-	.name = "tsc",
-	.delay = delay_tsc,
-};
-#endif
-
 /*
  * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
  * yielding a 64-bit result.
@@ -226,14 +208,6 @@ static inline u64 scale_delta(u64 delta,
 	return product;
 }
 
-#if 0 /* defined (__i386__) */
-int read_current_timer(unsigned long *timer_val)
-{
-	rdtscl(*timer_val);
-	return 0;
-}
-#endif
-
 void init_cpu_khz(void)
 {
 	u64 __cpu_khz = 1000000ULL << 32;
@@ -253,6 +227,7 @@ static u64 get_nsec_offset(struct shadow
 	return scale_delta(delta, shadow->tsc_to_nsec_mul, shadow->tsc_shift);
 }
 
+#ifdef CONFIG_X86_64
 static unsigned long get_usec_offset(struct shadow_time_info *shadow)
 {
 	u64 now, delta;
@@ -260,6 +235,7 @@ static unsigned long get_usec_offset(str
 	delta = now - shadow->tsc_timestamp;
 	return scale_delta(delta, shadow->tsc_to_usec_mul, shadow->tsc_shift);
 }
+#endif
 
 static void __update_wallclock(time_t sec, long nsec)
 {
@@ -374,6 +350,8 @@ void rtc_cmos_write(unsigned char val, u
 }
 EXPORT_SYMBOL(rtc_cmos_write);
 
+#ifdef CONFIG_X86_64
+
 static struct {
 	spinlock_t lock;
 	struct timeval tv;
@@ -530,6 +508,8 @@ int do_settimeofday(struct timespec *tv)
 
 EXPORT_SYMBOL(do_settimeofday);
 
+#endif
+
 static void sync_xen_wallclock(unsigned long dummy);
 static DEFINE_TIMER(sync_xen_wallclock_timer, sync_xen_wallclock, 0, 0);
 static void sync_xen_wallclock(unsigned long dummy)
@@ -581,11 +561,15 @@ static int set_rtc_mmss(unsigned long no
 	return retval;
 }
 
+#ifdef CONFIG_X86_64
 /* monotonic_clock(): returns # of nanoseconds passed since time_init()
  *		Note: This function is required to return accurate
  *		time even in the absence of multiple timer ticks.
  */
 unsigned long long monotonic_clock(void)
+#else
+unsigned long long sched_clock(void)
+#endif
 {
 	unsigned int cpu = get_cpu();
 	struct shadow_time_info *shadow = &per_cpu(shadow_time, cpu);
@@ -605,9 +589,9 @@ unsigned long long monotonic_clock(void)
 
 	return time;
 }
+#ifdef CONFIG_X86_64
 EXPORT_SYMBOL(monotonic_clock);
 
-#ifdef __x86_64__
 unsigned long long sched_clock(void)
 {
 	return monotonic_clock();
@@ -780,6 +764,89 @@ irqreturn_t timer_interrupt(int irq, voi
 	return IRQ_HANDLED;
 }
 
+#ifndef CONFIG_X86_64
+
+void tsc_init(void)
+{
+	init_cpu_khz();
+	printk(KERN_INFO "Xen reported: %u.%03u MHz processor.\n",
+	       cpu_khz / 1000, cpu_khz % 1000);
+
+	use_tsc_delay();
+}
+
+#include <linux/clocksource.h>
+
+void mark_tsc_unstable(void)
+{
+#ifndef CONFIG_XEN /* XXX Should tell the hypervisor about this fact. */
+	tsc_unstable = 1;
+#endif
+}
+EXPORT_SYMBOL_GPL(mark_tsc_unstable);
+
+static cycle_t xen_clocksource_read(void)
+{
+#ifdef CONFIG_SMP
+	static cycle_t last_ret;
+#ifndef CONFIG_64BIT
+	cycle_t last = cmpxchg64(&last_ret, 0, 0);
+#else
+	cycle_t last = last_ret;
+#define cmpxchg64 cmpxchg
+#endif
+	cycle_t ret = sched_clock();
+
+	if (unlikely((s64)(ret - last) < 0)) {
+		if (last - ret > permitted_clock_jitter
+		    && printk_ratelimit()) {
+			unsigned int cpu = get_cpu();
+			struct shadow_time_info *shadow = &per_cpu(shadow_time, cpu);
+
+			printk(KERN_WARNING "clocksource/%u: "
+			       "Time went backwards: "
+			       "ret=%Lx delta=%Ld shadow=%Lx offset=%Lx\n",
+			       cpu, ret, ret - last, shadow->system_timestamp,
+			       get_nsec_offset(shadow));
+			put_cpu();
+		}
+		return last;
+	}
+
+	for (;;) {
+		cycle_t cur = cmpxchg64(&last_ret, last, ret);
+
+		if (cur == last || (s64)(ret - cur) < 0)
+			return ret;
+		last = cur;
+	}
+#else
+	return sched_clock();
+#endif
+}
+
+static struct clocksource clocksource_xen = {
+	.name			= "xen",
+	.rating			= 400,
+	.read			= xen_clocksource_read,
+	.mask			= CLOCKSOURCE_MASK(64),
+	.mult			= 1 << XEN_SHIFT,		/* time directly in nanoseconds */
+	.shift			= XEN_SHIFT,
+	.is_continuous		= 1,
+};
+
+static int __init init_xen_clocksource(void)
+{
+	clocksource_xen.mult = clocksource_khz2mult(cpu_khz,
+						clocksource_xen.shift);
+
+	return clocksource_register(&clocksource_xen);
+}
+
+module_init(init_xen_clocksource);
+
+#endif
+
 static void init_missing_ticks_accounting(unsigned int cpu)
 {
 	struct vcpu_register_runstate_memory_area area;
@@ -926,7 +993,7 @@ static void setup_cpu0_timer_irq(void)
 			VIRQ_TIMER,
 			0,
 			timer_interrupt,
-			SA_INTERRUPT,
+			IRQF_DISABLED|IRQF_TIMER,
 			"timer0",
 			NULL);
 	BUG_ON(per_cpu(timer_irq, 0) < 0);
@@ -968,11 +1035,11 @@ void __init time_init(void)
 
 	update_wallclock();
 
+#ifdef CONFIG_X86_64
 	init_cpu_khz();
 	printk(KERN_INFO "Xen reported: %u.%03u MHz processor.\n",
 	       cpu_khz / 1000, cpu_khz % 1000);
 
-#if defined(__x86_64__)
 	vxtime.mode = VXTIME_TSC;
 	vxtime.quot = (1000000L << 32) / vxtime_hz;
 	vxtime.tsc_quot = (1000L << 32) / cpu_khz;
@@ -1147,7 +1214,7 @@ int __cpuinit local_setup_timer(unsigned
 	irq = bind_virq_to_irqhandler(VIRQ_TIMER,
 				      cpu,
 				      timer_interrupt,
-				      SA_INTERRUPT,
+				      IRQF_DISABLED|IRQF_TIMER,
 				      timer_name[cpu],
 				      NULL);
 	if (irq < 0)
--- head-2011-03-17.orig/arch/x86/mm/ioremap-xen.c	2010-09-16 13:31:46.000000000 +0200
+++ head-2011-03-17/arch/x86/mm/ioremap-xen.c	2011-02-07 15:31:26.000000000 +0100
@@ -154,21 +154,6 @@ int create_lookup_pte_addr(struct mm_str
 
 EXPORT_SYMBOL(create_lookup_pte_addr);
 
-static int noop_fn(
-	pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
-{
-	return 0;
-}
-
-int touch_pte_range(struct mm_struct *mm,
-		    unsigned long address,
-		    unsigned long size)
-{
-	return apply_to_page_range(mm, address, size, noop_fn, NULL);
-} 
-
-EXPORT_SYMBOL(touch_pte_range);
-
 /*
  * Does @address reside within a non-highmem page that is local to this virtual
  * machine (i.e., not an I/O page, nor a memory page belonging to another VM).
--- head-2011-03-17.orig/drivers/acpi/processor_perflib.c	2011-01-31 14:53:38.000000000 +0100
+++ head-2011-03-17/drivers/acpi/processor_perflib.c	2011-01-31 17:02:29.000000000 +0100
@@ -578,6 +578,8 @@ end:
 	return result;
 }
 
+#ifndef CONFIG_PROCESSOR_EXTERNAL_CONTROL
+
 int acpi_processor_preregister_performance(
 		struct acpi_processor_performance __percpu *performance)
 {
@@ -793,3 +795,5 @@ acpi_processor_unregister_performance(st
 }
 
 EXPORT_SYMBOL(acpi_processor_unregister_performance);
+
+#endif /* !CONFIG_PROCESSOR_EXTERNAL_CONTROL */
--- head-2011-03-17.orig/drivers/char/agp/intel-gtt.c	2011-03-11 10:51:50.000000000 +0100
+++ head-2011-03-17/drivers/char/agp/intel-gtt.c	2011-03-11 10:53:08.000000000 +0100
@@ -156,6 +156,10 @@ static struct page *i8xx_alloc_pages(voi
 
 	if (set_pages_uc(page, 4) < 0) {
 		set_pages_wb(page, 4);
+#ifdef CONFIG_XEN
+		xen_destroy_contiguous_region((unsigned long)page_address(page),
+					      2);
+#endif
 		__free_pages(page, 2);
 		return NULL;
 	}
--- head-2011-03-17.orig/drivers/xen/blkback/interface.c	2010-09-23 15:39:04.000000000 +0200
+++ head-2011-03-17/drivers/xen/blkback/interface.c	2011-01-31 17:02:29.000000000 +0100
@@ -41,11 +41,10 @@ blkif_t *blkif_alloc(domid_t domid)
 {
 	blkif_t *blkif;
 
-	blkif = kmem_cache_alloc(blkif_cachep, GFP_KERNEL);
+	blkif = kmem_cache_zalloc(blkif_cachep, GFP_KERNEL);
 	if (!blkif)
 		return ERR_PTR(-ENOMEM);
 
-	memset(blkif, 0, sizeof(*blkif));
 	blkif->domid = domid;
 	spin_lock_init(&blkif->blk_ring_lock);
 	atomic_set(&blkif->refcnt, 1);
--- head-2011-03-17.orig/drivers/xen/blktap/interface.c	2010-09-23 15:39:04.000000000 +0200
+++ head-2011-03-17/drivers/xen/blktap/interface.c	2011-01-31 17:02:29.000000000 +0100
@@ -41,11 +41,10 @@ blkif_t *tap_alloc_blkif(domid_t domid)
 {
 	blkif_t *blkif;
 
-	blkif = kmem_cache_alloc(blkif_cachep, GFP_KERNEL);
+	blkif = kmem_cache_zalloc(blkif_cachep, GFP_KERNEL);
 	if (!blkif)
 		return ERR_PTR(-ENOMEM);
 
-	memset(blkif, 0, sizeof(*blkif));
 	blkif->domid = domid;
 	spin_lock_init(&blkif->blk_ring_lock);
 	atomic_set(&blkif->refcnt, 1);
--- head-2011-03-17.orig/drivers/xen/blktap2/control.c	2010-04-29 09:34:47.000000000 +0200
+++ head-2011-03-17/drivers/xen/blktap2/control.c	2011-02-24 15:15:38.000000000 +0100
@@ -145,7 +145,7 @@ blktap_control_ioctl(struct inode *inode
 	return -ENOIOCTLCMD;
 }
 
-static struct file_operations blktap_control_file_operations = {
+static const struct file_operations blktap_control_file_operations = {
 	.owner    = THIS_MODULE,
 	.ioctl    = blktap_control_ioctl,
 };
--- head-2011-03-17.orig/drivers/xen/blktap2/ring.c	2010-08-31 09:24:21.000000000 +0200
+++ head-2011-03-17/drivers/xen/blktap2/ring.c	2011-02-24 15:15:44.000000000 +0100
@@ -479,7 +479,7 @@ static unsigned int blktap_ring_poll(str
 	return 0;
 }
 
-static struct file_operations blktap_ring_file_operations = {
+static const struct file_operations blktap_ring_file_operations = {
 	.owner    = THIS_MODULE,
 	.open     = blktap_ring_open,
 	.release  = blktap_ring_release,
--- head-2011-03-17.orig/drivers/xen/console/console.c	2009-03-18 10:39:31.000000000 +0100
+++ head-2011-03-17/drivers/xen/console/console.c	2011-01-31 17:02:29.000000000 +0100
@@ -94,7 +94,6 @@ static int __init xencons_setup(char *st
 {
 	char *q;
 	int n;
-	extern int console_use_vt;
 
 	console_use_vt = 1;
 	if (!strncmp(str, "ttyS", 4)) {
--- head-2011-03-17.orig/drivers/xen/netback/common.h	2011-02-17 09:58:10.000000000 +0100
+++ head-2011-03-17/drivers/xen/netback/common.h	2011-03-01 11:33:08.000000000 +0100
@@ -100,7 +100,7 @@ typedef struct netif_st {
 	struct timer_list tx_queue_timeout;
 
 	/* Statistics */
-	int nr_copied_skbs;
+	unsigned long nr_copied_skbs;
 
 	/* Miscellaneous private stuff. */
 	struct list_head list;  /* scheduling list */
--- head-2011-03-17.orig/drivers/xen/netback/interface.c	2011-02-17 09:58:10.000000000 +0100
+++ head-2011-03-17/drivers/xen/netback/interface.c	2011-03-17 14:10:30.000000000 +0100
@@ -169,7 +169,7 @@ static const struct netif_stat {
 	char name[ETH_GSTRING_LEN];
 	u16 offset;
 } netbk_stats[] = {
-	{ "copied_skbs", offsetof(netif_t, nr_copied_skbs) },
+	{ "copied_skbs", offsetof(netif_t, nr_copied_skbs) / sizeof(long) },
 };
 
 static int netbk_get_stats_count(struct net_device *dev)
@@ -180,11 +180,11 @@ static int netbk_get_stats_count(struct 
 static void netbk_get_ethtool_stats(struct net_device *dev,
 				   struct ethtool_stats *stats, u64 * data)
 {
-	void *netif = netdev_priv(dev);
+	unsigned long *np = netdev_priv(dev);
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(netbk_stats); i++)
-		data[i] = *(int *)(netif + netbk_stats[i].offset);
+		data[i] = np[netbk_stats[i].offset];
 }
 
 static void netbk_get_strings(struct net_device *dev, u32 stringset, u8 * data)
--- head-2011-03-17.orig/drivers/xen/scsiback/interface.c	2010-09-23 15:39:04.000000000 +0200
+++ head-2011-03-17/drivers/xen/scsiback/interface.c	2011-01-31 17:02:29.000000000 +0100
@@ -46,11 +46,10 @@ struct vscsibk_info *vscsibk_info_alloc(
 {
 	struct vscsibk_info *info;
 
-	info = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
+	info = kmem_cache_zalloc(scsiback_cachep, GFP_KERNEL);
 	if (!info)
 		return ERR_PTR(-ENOMEM);
 
-	memset(info, 0, sizeof(*info));
 	info->domid = domid;
 	spin_lock_init(&info->ring_lock);
 	atomic_set(&info->nr_unreplied_reqs, 0);
--- head-2011-03-17.orig/drivers/xen/tpmback/interface.c	2010-09-23 15:39:04.000000000 +0200
+++ head-2011-03-17/drivers/xen/tpmback/interface.c	2011-01-31 17:02:29.000000000 +0100
@@ -25,11 +25,10 @@ static tpmif_t *alloc_tpmif(domid_t domi
 {
 	tpmif_t *tpmif;
 
-	tpmif = kmem_cache_alloc(tpmif_cachep, GFP_KERNEL);
+	tpmif = kmem_cache_zalloc(tpmif_cachep, GFP_KERNEL);
 	if (tpmif == NULL)
 		goto out_of_memory;
 
-	memset(tpmif, 0, sizeof (*tpmif));
 	tpmif->domid = domid;
 	tpmif->status = DISCONNECTED;
 	tpmif->bi = bi;
--- head-2011-03-17.orig/arch/x86/include/mach-xen/asm/pgtable_32.h	2009-03-18 10:39:32.000000000 +0100
+++ head-2011-03-17/arch/x86/include/mach-xen/asm/pgtable_32.h	2011-02-07 15:33:33.000000000 +0100
@@ -521,9 +521,6 @@ int direct_kernel_remap_pfn_range(unsign
 int create_lookup_pte_addr(struct mm_struct *mm,
                            unsigned long address,
                            uint64_t *ptep);
-int touch_pte_range(struct mm_struct *mm,
-                    unsigned long address,
-                    unsigned long size);
 
 int xen_change_pte_range(struct mm_struct *mm, pmd_t *pmd,
 		unsigned long addr, unsigned long end, pgprot_t newprot);
--- head-2011-03-17.orig/arch/x86/include/mach-xen/asm/pgtable_64.h	2009-06-23 09:28:21.000000000 +0200
+++ head-2011-03-17/arch/x86/include/mach-xen/asm/pgtable_64.h	2011-02-07 15:33:42.000000000 +0100
@@ -394,7 +394,6 @@ static inline int pmd_large(pmd_t pte) {
 
 /*
  * Level 4 access.
- * Never use these in the common code.
  */
 #define pgd_page(pgd) ((unsigned long) __va(pgd_val(pgd) & PTE_MASK))
 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
@@ -543,10 +542,6 @@ int create_lookup_pte_addr(struct mm_str
                            unsigned long address,
                            uint64_t *ptep);
 
-int touch_pte_range(struct mm_struct *mm,
-                    unsigned long address,
-                    unsigned long size);
-
 int xen_change_pte_range(struct mm_struct *mm, pmd_t *pmd,
 		unsigned long addr, unsigned long end, pgprot_t newprot);
 
--- head-2011-03-17.orig/arch/x86/include/mach-xen/asm/processor_32.h	2008-01-28 12:24:19.000000000 +0100
+++ head-2011-03-17/arch/x86/include/mach-xen/asm/processor_32.h	2011-01-31 17:02:29.000000000 +0100
@@ -23,7 +23,7 @@
 #include <xen/interface/physdev.h>
 
 /* flag for disabling the tsc */
-extern int tsc_disable;
+#define tsc_disable 0
 
 struct desc_struct {
 	unsigned long a,b;
--- head-2011-03-17.orig/arch/x86/include/asm/thread_info.h	2011-03-17 13:45:28.000000000 +0100
+++ head-2011-03-17/arch/x86/include/asm/thread_info.h	2011-01-31 17:02:29.000000000 +0100
@@ -144,11 +144,15 @@ struct thread_info {
 	 _TIF_USER_RETURN_NOTIFY)
 
 /* flags to check in __switch_to() */
+#ifndef CONFIG_XEN
 #define _TIF_WORK_CTXSW							\
 	(_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP)
 
 #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
+#else
+#define _TIF_WORK_CTXSW _TIF_DEBUG
+#endif
 
 #define PREEMPT_ACTIVE		0x10000000
 
--- head-2011-03-17.orig/arch/x86/kernel/quirks.c	2011-03-17 13:45:28.000000000 +0100
+++ head-2011-03-17/arch/x86/kernel/quirks.c	2011-02-28 15:04:15.000000000 +0100
@@ -6,7 +6,7 @@
 
 #include <asm/hpet.h>
 
-#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
+#if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_SMP) || defined(CONFIG_XEN)) && defined(CONFIG_PCI)
 
 static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
 {
@@ -35,10 +35,21 @@ static void __devinit quirk_intel_irqbal
 	if (!(word & (1 << 13))) {
 		dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
 			"disabling irq balancing and affinity\n");
+#ifndef CONFIG_XEN
 		noirqdebug_setup("");
 #ifdef CONFIG_PROC_FS
 		no_irq_affinity = 1;
 #endif
+#else
+		{
+			struct xen_platform_op op = {
+				.cmd = XENPF_platform_quirk,
+				.u.platform_quirk.quirk_id = QUIRK_NOIRQBALANCING
+			};
+
+			WARN_ON(HYPERVISOR_platform_op(&op));
+		}
+#endif
 	}
 
 	/* put back the original value for config space*/