[GIT PULL] (xen) for stable/for-ingo-v3.5.v3 for v3.5

[GIT PULL] (xen) for stable/for-ingo-v3.5.v3 for v3.5

[Konrad Rzeszutek Wilk]

Hey Ingo,

Please git pull the following branch for v3.5:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-ingo-v3.5.v3

It has the proper fix for the IO-APIC having 0xfffff... contents when booting under Xen.

Compared to the patch you have already in the tree (136d249ef7dbf0fefa292082cc40be1ea864cbd6
 x86/ioapic: Add io_apic_ops driver layer to allow interception) it does three things:

 1) Exposes the io_apic baremetal functions and uses the x86_io_apic_ops function table
    instead of keeping it in the io_apic. This makes the code fit within the rest of
    x86_ops functions.

 2) Use the x86_io_apic_ops to re-direct the (*read) to the Xen emulated one.

 3) Removes the work-around.

Please note, that the existing interface (136d249) can be used to do 2) as well. But the
1) makes the code more uniform by putting the function table redirection in the same
location.

Thank you!

Konrad Rzeszutek Wilk (3):
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      xen/x86: Implement x86_apic_ops
      Revert "xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries'"

 arch/x86/include/asm/io_apic.h  |   35 +++++++++++++++++++----------
 arch/x86/include/asm/x86_init.h |    9 ++++++-
 arch/x86/kernel/apic/io_apic.c  |   46 +++-----------------------------------
 arch/x86/kernel/setup.c         |    2 +-
 arch/x86/kernel/x86_init.c      |    8 ++++++
 arch/x86/xen/Makefile           |    2 +-
 arch/x86/xen/apic.c             |   17 ++++++++++++++
 arch/x86/xen/enlighten.c        |    2 +
 arch/x86/xen/mmu.c              |    4 +--
 arch/x86/xen/xen-ops.h          |    4 +++
 10 files changed, 69 insertions(+), 60 deletions(-)

[GIT PULL] (xen) for stable/for-ingo-v3.5.v3 for v3.5

[Konrad Rzeszutek Wilk]

Hey Ingo,

Please git pull the following branch for v3.5:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-ingo-v3.5.v3

It has the proper fix for the IO-APIC having 0xfffff... contents when booting under Xen.

Compared to the patch you have already in the tree (136d249ef7dbf0fefa292082cc40be1ea864cbd6
 x86/ioapic: Add io_apic_ops driver layer to allow interception) it does three things:

 1) Exposes the io_apic baremetal functions and uses the x86_io_apic_ops function table
    instead of keeping it in the io_apic. This makes the code fit within the rest of
    x86_ops functions.

 2) Use the x86_io_apic_ops to re-direct the (*read) to the Xen emulated one.

 3) Removes the work-around.

Please note, that the existing interface (136d249) can be used to do 2) as well. But the
1) makes the code more uniform by putting the function table redirection in the same
location.

Thank you!

Konrad Rzeszutek Wilk (3):
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      xen/x86: Implement x86_apic_ops
      Revert "xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries'"

 arch/x86/include/asm/io_apic.h  |   35 +++++++++++++++++++----------
 arch/x86/include/asm/x86_init.h |    9 ++++++-
 arch/x86/kernel/apic/io_apic.c  |   46 +++-----------------------------------
 arch/x86/kernel/setup.c         |    2 +-
 arch/x86/kernel/x86_init.c      |    8 ++++++
 arch/x86/xen/Makefile           |    2 +-
 arch/x86/xen/apic.c             |   17 ++++++++++++++
 arch/x86/xen/enlighten.c        |    2 +
 arch/x86/xen/mmu.c              |    4 +--
 arch/x86/xen/xen-ops.h          |    4 +++
 10 files changed, 69 insertions(+), 60 deletions(-)

[PATCH 1/3] x86/apic: Replace io_apic_ops with x86_io_apic_ops.

[Konrad Rzeszutek Wilk]

Which makes the code fit within the rest of the x86_ops functions.

Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
[v1: Changed x86_apic -> x86_ioapic per Yinghai Lu <yinghai@kernel.org> suggestion]
[v2: Rebased on tip/x86/urgent and redid to match Ingo's syntax style]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/include/asm/io_apic.h  |   35 +++++++++++++++++++----------
 arch/x86/include/asm/x86_init.h |    9 ++++++-
 arch/x86/kernel/apic/io_apic.c  |   46 +++-----------------------------------
 arch/x86/kernel/setup.c         |    2 +-
 arch/x86/kernel/x86_init.c      |    8 ++++++
 5 files changed, 44 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2c4943d..73d8c53 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -5,7 +5,7 @@
 #include <asm/mpspec.h>
 #include <asm/apicdef.h>
 #include <asm/irq_vectors.h>
-
+#include <asm/x86_init.h>
 /*
  * Intel IO-APIC support for SMP and UP systems.
  *
@@ -21,15 +21,6 @@
 #define IO_APIC_REDIR_LEVEL_TRIGGER	(1 << 15)
 #define IO_APIC_REDIR_MASKED		(1 << 16)
 
-struct io_apic_ops {
-	void		(*init)  (void);
-	unsigned int	(*read)  (unsigned int apic, unsigned int reg);
-	void		(*write) (unsigned int apic, unsigned int reg, unsigned int value);
-	void		(*modify)(unsigned int apic, unsigned int reg, unsigned int value);
-};
-
-void __init set_io_apic_ops(const struct io_apic_ops *);
-
 /*
  * The structure of the IO-APIC:
  */
@@ -156,7 +147,6 @@ struct io_apic_irq_attr;
 extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
-extern void ioapic_and_gsi_init(void);
 extern void ioapic_insert_resources(void);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
@@ -185,12 +175,29 @@ extern void mp_save_irq(struct mpc_intsrc *m);
 
 extern void disable_ioapic_support(void);
 
+extern void __init native_io_apic_init_mappings(void);
+extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
+extern void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int val);
+extern void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
+
+static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+{
+	return x86_io_apic_ops.read(apic, reg);
+}
+
+static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	x86_io_apic_ops.write(apic, reg, value);
+}
+static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	x86_io_apic_ops.modify(apic, reg, value);
+}
 #else  /* !CONFIG_X86_IO_APIC */
 
 #define io_apic_assign_pci_irqs 0
 #define setup_ioapic_ids_from_mpc x86_init_noop
 static const int timer_through_8259 = 0;
-static inline void ioapic_and_gsi_init(void) { }
 static inline void ioapic_insert_resources(void) { }
 #define gsi_top (NR_IRQS_LEGACY)
 static inline int mp_find_ioapic(u32 gsi) { return 0; }
@@ -212,6 +219,10 @@ static inline int restore_ioapic_entries(void)
 
 static inline void mp_save_irq(struct mpc_intsrc *m) { };
 static inline void disable_ioapic_support(void) { }
+#define native_io_apic_init_mappings	NULL
+#define native_io_apic_read		NULL
+#define native_io_apic_write		NULL
+#define native_io_apic_modify		NULL
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index baaca8d..1101580 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -188,11 +188,18 @@ struct x86_msi_ops {
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
 };
 
+struct x86_io_apic_ops {
+	void		(*init)  (void);
+	unsigned int	(*read)  (unsigned int apic, unsigned int reg);
+	void		(*write) (unsigned int apic, unsigned int reg, unsigned int value);
+	void		(*modify)(unsigned int apic, unsigned int reg, unsigned int value);
+};
+
 extern struct x86_init_ops x86_init;
 extern struct x86_cpuinit_ops x86_cpuinit;
 extern struct x86_platform_ops x86_platform;
 extern struct x86_msi_ops x86_msi;
-
+extern struct x86_io_apic_ops x86_io_apic_ops;
 extern void x86_init_noop(void);
 extern void x86_init_uint_noop(unsigned int unused);
 extern void x86_default_fixup_cpu_id(struct cpuinfo_x86 *c, int node);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d..973539c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -68,24 +68,6 @@
 #define for_each_irq_pin(entry, head) \
 	for (entry = head; entry; entry = entry->next)
 
-static void		__init __ioapic_init_mappings(void);
-
-static unsigned int	__io_apic_read  (unsigned int apic, unsigned int reg);
-static void		__io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
-static void		__io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
-
-static struct io_apic_ops io_apic_ops = {
-	.init	= __ioapic_init_mappings,
-	.read	= __io_apic_read,
-	.write	= __io_apic_write,
-	.modify = __io_apic_modify,
-};
-
-void __init set_io_apic_ops(const struct io_apic_ops *ops)
-{
-	io_apic_ops = *ops;
-}
-
 /*
  *      Is the SiS APIC rmw bug present ?
  *      -1 = don't know, 0 = no, 1 = yes
@@ -313,21 +295,6 @@ static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
 	irq_free_desc(at);
 }
 
-static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
-{
-	return io_apic_ops.read(apic, reg);
-}
-
-static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
-{
-	io_apic_ops.write(apic, reg, value);
-}
-
-static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
-{
-	io_apic_ops.modify(apic, reg, value);
-}
-
 
 struct io_apic {
 	unsigned int index;
@@ -349,14 +316,14 @@ static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
 	writel(vector, &io_apic->eoi);
 }
 
-static unsigned int __io_apic_read(unsigned int apic, unsigned int reg)
+unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 	writel(reg, &io_apic->index);
 	return readl(&io_apic->data);
 }
 
-static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 
@@ -370,7 +337,7 @@ static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int va
  *
  * Older SiS APIC requires we rewrite the index register
  */
-static void __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 
@@ -3931,12 +3898,7 @@ static struct resource * __init ioapic_setup_resources(int nr_ioapics)
 	return res;
 }
 
-void __init ioapic_and_gsi_init(void)
-{
-	io_apic_ops.init();
-}
-
-static void __init __ioapic_init_mappings(void)
+void __init native_io_apic_init_mappings(void)
 {
 	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
 	struct resource *ioapic_res;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1a29015..8526317 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1012,7 +1012,7 @@ void __init setup_arch(char **cmdline_p)
 	init_cpu_to_node();
 
 	init_apic_mappings();
-	ioapic_and_gsi_init();
+	x86_io_apic_ops.init();
 
 	kvm_guest_init();
 
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index e9f265f..b108682 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -18,6 +18,7 @@
 #include <asm/e820.h>
 #include <asm/time.h>
 #include <asm/irq.h>
+#include <asm/io_apic.h>
 #include <asm/pat.h>
 #include <asm/tsc.h>
 #include <asm/iommu.h>
@@ -120,3 +121,10 @@ struct x86_msi_ops x86_msi = {
 	.teardown_msi_irqs = default_teardown_msi_irqs,
 	.restore_msi_irqs = default_restore_msi_irqs,
 };
+
+struct x86_io_apic_ops x86_io_apic_ops = {
+	.init	= native_io_apic_init_mappings,
+	.read	= native_io_apic_read,
+	.write	= native_io_apic_write,
+	.modify	= native_io_apic_modify,
+};
-- 
1.7.7.5

[PATCH 1/3] x86/apic: Replace io_apic_ops with x86_io_apic_ops.

[Konrad Rzeszutek Wilk]

Which makes the code fit within the rest of the x86_ops functions.

Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
[v1: Changed x86_apic -> x86_ioapic per Yinghai Lu <yinghai@kernel.org> suggestion]
[v2: Rebased on tip/x86/urgent and redid to match Ingo's syntax style]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/include/asm/io_apic.h  |   35 +++++++++++++++++++----------
 arch/x86/include/asm/x86_init.h |    9 ++++++-
 arch/x86/kernel/apic/io_apic.c  |   46 +++-----------------------------------
 arch/x86/kernel/setup.c         |    2 +-
 arch/x86/kernel/x86_init.c      |    8 ++++++
 5 files changed, 44 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2c4943d..73d8c53 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -5,7 +5,7 @@
 #include <asm/mpspec.h>
 #include <asm/apicdef.h>
 #include <asm/irq_vectors.h>
-
+#include <asm/x86_init.h>
 /*
  * Intel IO-APIC support for SMP and UP systems.
  *
@@ -21,15 +21,6 @@
 #define IO_APIC_REDIR_LEVEL_TRIGGER	(1 << 15)
 #define IO_APIC_REDIR_MASKED		(1 << 16)
 
-struct io_apic_ops {
-	void		(*init)  (void);
-	unsigned int	(*read)  (unsigned int apic, unsigned int reg);
-	void		(*write) (unsigned int apic, unsigned int reg, unsigned int value);
-	void		(*modify)(unsigned int apic, unsigned int reg, unsigned int value);
-};
-
-void __init set_io_apic_ops(const struct io_apic_ops *);
-
 /*
  * The structure of the IO-APIC:
  */
@@ -156,7 +147,6 @@ struct io_apic_irq_attr;
 extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
-extern void ioapic_and_gsi_init(void);
 extern void ioapic_insert_resources(void);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
@@ -185,12 +175,29 @@ extern void mp_save_irq(struct mpc_intsrc *m);
 
 extern void disable_ioapic_support(void);
 
+extern void __init native_io_apic_init_mappings(void);
+extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
+extern void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int val);
+extern void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
+
+static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+{
+	return x86_io_apic_ops.read(apic, reg);
+}
+
+static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	x86_io_apic_ops.write(apic, reg, value);
+}
+static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	x86_io_apic_ops.modify(apic, reg, value);
+}
 #else  /* !CONFIG_X86_IO_APIC */
 
 #define io_apic_assign_pci_irqs 0
 #define setup_ioapic_ids_from_mpc x86_init_noop
 static const int timer_through_8259 = 0;
-static inline void ioapic_and_gsi_init(void) { }
 static inline void ioapic_insert_resources(void) { }
 #define gsi_top (NR_IRQS_LEGACY)
 static inline int mp_find_ioapic(u32 gsi) { return 0; }
@@ -212,6 +219,10 @@ static inline int restore_ioapic_entries(void)
 
 static inline void mp_save_irq(struct mpc_intsrc *m) { };
 static inline void disable_ioapic_support(void) { }
+#define native_io_apic_init_mappings	NULL
+#define native_io_apic_read		NULL
+#define native_io_apic_write		NULL
+#define native_io_apic_modify		NULL
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index baaca8d..1101580 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -188,11 +188,18 @@ struct x86_msi_ops {
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
 };
 
+struct x86_io_apic_ops {
+	void		(*init)  (void);
+	unsigned int	(*read)  (unsigned int apic, unsigned int reg);
+	void		(*write) (unsigned int apic, unsigned int reg, unsigned int value);
+	void		(*modify)(unsigned int apic, unsigned int reg, unsigned int value);
+};
+
 extern struct x86_init_ops x86_init;
 extern struct x86_cpuinit_ops x86_cpuinit;
 extern struct x86_platform_ops x86_platform;
 extern struct x86_msi_ops x86_msi;
-
+extern struct x86_io_apic_ops x86_io_apic_ops;
 extern void x86_init_noop(void);
 extern void x86_init_uint_noop(unsigned int unused);
 extern void x86_default_fixup_cpu_id(struct cpuinfo_x86 *c, int node);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d..973539c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -68,24 +68,6 @@
 #define for_each_irq_pin(entry, head) \
 	for (entry = head; entry; entry = entry->next)
 
-static void		__init __ioapic_init_mappings(void);
-
-static unsigned int	__io_apic_read  (unsigned int apic, unsigned int reg);
-static void		__io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
-static void		__io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
-
-static struct io_apic_ops io_apic_ops = {
-	.init	= __ioapic_init_mappings,
-	.read	= __io_apic_read,
-	.write	= __io_apic_write,
-	.modify = __io_apic_modify,
-};
-
-void __init set_io_apic_ops(const struct io_apic_ops *ops)
-{
-	io_apic_ops = *ops;
-}
-
 /*
  *      Is the SiS APIC rmw bug present ?
  *      -1 = don't know, 0 = no, 1 = yes
@@ -313,21 +295,6 @@ static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
 	irq_free_desc(at);
 }
 
-static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
-{
-	return io_apic_ops.read(apic, reg);
-}
-
-static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
-{
-	io_apic_ops.write(apic, reg, value);
-}
-
-static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
-{
-	io_apic_ops.modify(apic, reg, value);
-}
-
 
 struct io_apic {
 	unsigned int index;
@@ -349,14 +316,14 @@ static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
 	writel(vector, &io_apic->eoi);
 }
 
-static unsigned int __io_apic_read(unsigned int apic, unsigned int reg)
+unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 	writel(reg, &io_apic->index);
 	return readl(&io_apic->data);
 }
 
-static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 
@@ -370,7 +337,7 @@ static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int va
  *
  * Older SiS APIC requires we rewrite the index register
  */
-static void __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 
@@ -3931,12 +3898,7 @@ static struct resource * __init ioapic_setup_resources(int nr_ioapics)
 	return res;
 }
 
-void __init ioapic_and_gsi_init(void)
-{
-	io_apic_ops.init();
-}
-
-static void __init __ioapic_init_mappings(void)
+void __init native_io_apic_init_mappings(void)
 {
 	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
 	struct resource *ioapic_res;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1a29015..8526317 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1012,7 +1012,7 @@ void __init setup_arch(char **cmdline_p)
 	init_cpu_to_node();
 
 	init_apic_mappings();
-	ioapic_and_gsi_init();
+	x86_io_apic_ops.init();
 
 	kvm_guest_init();
 
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index e9f265f..b108682 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -18,6 +18,7 @@
 #include <asm/e820.h>
 #include <asm/time.h>
 #include <asm/irq.h>
+#include <asm/io_apic.h>
 #include <asm/pat.h>
 #include <asm/tsc.h>
 #include <asm/iommu.h>
@@ -120,3 +121,10 @@ struct x86_msi_ops x86_msi = {
 	.teardown_msi_irqs = default_teardown_msi_irqs,
 	.restore_msi_irqs = default_restore_msi_irqs,
 };
+
+struct x86_io_apic_ops x86_io_apic_ops = {
+	.init	= native_io_apic_init_mappings,
+	.read	= native_io_apic_read,
+	.write	= native_io_apic_write,
+	.modify	= native_io_apic_modify,
+};
-- 
1.7.7.5

[PATCH 2/3] xen/x86: Implement x86_apic_ops

[Konrad Rzeszutek Wilk]

Or rather just implement one different function as opposed
to the native one : the read function.

We synthesize the values.

Acked-by:  Suresh Siddha <suresh.b.siddha@intel.com>
[v1: Rebased on top of tip/x86/urgent]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/Makefile    |    2 +-
 arch/x86/xen/apic.c      |   17 +++++++++++++++++
 arch/x86/xen/enlighten.c |    2 ++
 arch/x86/xen/xen-ops.h   |    4 ++++
 4 files changed, 24 insertions(+), 1 deletions(-)
 create mode 100644 arch/x86/xen/apic.c

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index add2c2d..96ab2c0 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -20,5 +20,5 @@ obj-$(CONFIG_EVENT_TRACING) += trace.o
 obj-$(CONFIG_SMP)		+= smp.o
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
 obj-$(CONFIG_XEN_DEBUG_FS)	+= debugfs.o
-obj-$(CONFIG_XEN_DOM0)		+= vga.o
+obj-$(CONFIG_XEN_DOM0)		+= apic.o vga.o
 obj-$(CONFIG_SWIOTLB_XEN)	+= pci-swiotlb-xen.o
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
new file mode 100644
index 0000000..aee16ab
--- /dev/null
+++ b/arch/x86/xen/apic.c
@@ -0,0 +1,17 @@
+#include <linux/init.h>
+#include <asm/x86_init.h>
+
+unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
+{
+	if (reg == 0x1)
+		return 0x00170020;
+	else if (reg == 0x0)
+		return apic << 24;
+
+	return 0xff;
+}
+
+void __init xen_init_apic(void)
+{
+	x86_io_apic_ops.read = xen_io_apic_read;
+}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4f51beb..2e9cde8 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1362,6 +1362,8 @@ asmlinkage void __init xen_start_kernel(void)
 		xen_start_info->console.domU.mfn = 0;
 		xen_start_info->console.domU.evtchn = 0;
 
+		xen_init_apic();
+
 		/* Make sure ACS will be enabled */
 		pci_request_acs();
 	}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index b095739..45c0c06 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -92,11 +92,15 @@ struct dom0_vga_console_info;
 
 #ifdef CONFIG_XEN_DOM0
 void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
+void __init xen_init_apic(void);
 #else
 static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
 				       size_t size)
 {
 }
+static inline void __init xen_init_apic(void)
+{
+}
 #endif
 
 /* Declare an asm function, along with symbols needed to make it
-- 
1.7.7.5

[PATCH 2/3] xen/x86: Implement x86_apic_ops

[Konrad Rzeszutek Wilk]

Or rather just implement one different function as opposed
to the native one : the read function.

We synthesize the values.

Acked-by:  Suresh Siddha <suresh.b.siddha@intel.com>
[v1: Rebased on top of tip/x86/urgent]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/Makefile    |    2 +-
 arch/x86/xen/apic.c      |   17 +++++++++++++++++
 arch/x86/xen/enlighten.c |    2 ++
 arch/x86/xen/xen-ops.h   |    4 ++++
 4 files changed, 24 insertions(+), 1 deletions(-)
 create mode 100644 arch/x86/xen/apic.c

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index add2c2d..96ab2c0 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -20,5 +20,5 @@ obj-$(CONFIG_EVENT_TRACING) += trace.o
 obj-$(CONFIG_SMP)		+= smp.o
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
 obj-$(CONFIG_XEN_DEBUG_FS)	+= debugfs.o
-obj-$(CONFIG_XEN_DOM0)		+= vga.o
+obj-$(CONFIG_XEN_DOM0)		+= apic.o vga.o
 obj-$(CONFIG_SWIOTLB_XEN)	+= pci-swiotlb-xen.o
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
new file mode 100644
index 0000000..aee16ab
--- /dev/null
+++ b/arch/x86/xen/apic.c
@@ -0,0 +1,17 @@
+#include <linux/init.h>
+#include <asm/x86_init.h>
+
+unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
+{
+	if (reg == 0x1)
+		return 0x00170020;
+	else if (reg == 0x0)
+		return apic << 24;
+
+	return 0xff;
+}
+
+void __init xen_init_apic(void)
+{
+	x86_io_apic_ops.read = xen_io_apic_read;
+}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4f51beb..2e9cde8 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1362,6 +1362,8 @@ asmlinkage void __init xen_start_kernel(void)
 		xen_start_info->console.domU.mfn = 0;
 		xen_start_info->console.domU.evtchn = 0;
 
+		xen_init_apic();
+
 		/* Make sure ACS will be enabled */
 		pci_request_acs();
 	}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index b095739..45c0c06 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -92,11 +92,15 @@ struct dom0_vga_console_info;
 
 #ifdef CONFIG_XEN_DOM0
 void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
+void __init xen_init_apic(void);
 #else
 static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
 				       size_t size)
 {
 }
+static inline void __init xen_init_apic(void)
+{
+}
 #endif
 
 /* Declare an asm function, along with symbols needed to make it
-- 
1.7.7.5

[PATCH 3/3] Revert "xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries'"

[Konrad Rzeszutek Wilk]

This reverts commit 2531d64b6fe2724dc432b67d8dc66bd45621da0b.

The two patches:
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      xen/x86: Implement x86_apic_ops

take care of fixing it properly.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/mmu.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index b8e2794..988828b 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1859,7 +1859,6 @@ pgd_t * __init xen_setup_kernel_pagetable(pgd_t *pgd,
 #endif	/* CONFIG_X86_64 */
 
 static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
-static unsigned char fake_ioapic_mapping[PAGE_SIZE] __page_aligned_bss;
 
 static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 {
@@ -1900,7 +1899,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 		 * We just don't map the IO APIC - all access is via
 		 * hypercalls.  Keep the address in the pte for reference.
 		 */
-		pte = pfn_pte(PFN_DOWN(__pa(fake_ioapic_mapping)), PAGE_KERNEL);
+		pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
 		break;
 #endif
 
@@ -2065,7 +2064,6 @@ void __init xen_init_mmu_ops(void)
 	pv_mmu_ops = xen_mmu_ops;
 
 	memset(dummy_mapping, 0xff, PAGE_SIZE);
-	memset(fake_ioapic_mapping, 0xfd, PAGE_SIZE);
 }
 
 /* Protected by xen_reservation_lock. */
-- 
1.7.7.5

[PATCH 3/3] Revert "xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries'"

[Konrad Rzeszutek Wilk]

This reverts commit 2531d64b6fe2724dc432b67d8dc66bd45621da0b.

The two patches:
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      xen/x86: Implement x86_apic_ops

take care of fixing it properly.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/mmu.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index b8e2794..988828b 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1859,7 +1859,6 @@ pgd_t * __init xen_setup_kernel_pagetable(pgd_t *pgd,
 #endif	/* CONFIG_X86_64 */
 
 static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
-static unsigned char fake_ioapic_mapping[PAGE_SIZE] __page_aligned_bss;
 
 static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 {
@@ -1900,7 +1899,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 		 * We just don't map the IO APIC - all access is via
 		 * hypercalls.  Keep the address in the pte for reference.
 		 */
-		pte = pfn_pte(PFN_DOWN(__pa(fake_ioapic_mapping)), PAGE_KERNEL);
+		pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
 		break;
 #endif
 
@@ -2065,7 +2064,6 @@ void __init xen_init_mmu_ops(void)
 	pv_mmu_ops = xen_mmu_ops;
 
 	memset(dummy_mapping, 0xff, PAGE_SIZE);
-	memset(fake_ioapic_mapping, 0xfd, PAGE_SIZE);
 }
 
 /* Protected by xen_reservation_lock. */
-- 
1.7.7.5

Re: [GIT PULL] (xen) for stable/for-ingo-v3.5.v3 for v3.5

[Konrad Rzeszutek Wilk]

On Mon, Apr 16, 2012 at 02:40:13PM -0400, Konrad Rzeszutek Wilk wrote:
> Hey Ingo,
> 
> Please git pull the following branch for v3.5:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-ingo-v3.5.v3
> 
> It has the proper fix for the IO-APIC having 0xfffff... contents when booting under Xen.
> 
> Compared to the patch you have already in the tree (136d249ef7dbf0fefa292082cc40be1ea864cbd6
>  x86/ioapic: Add io_apic_ops driver layer to allow interception) it does three things:
> 
>  1) Exposes the io_apic baremetal functions and uses the x86_io_apic_ops function table
>     instead of keeping it in the io_apic. This makes the code fit within the rest of
>     x86_ops functions.
> 
>  2) Use the x86_io_apic_ops to re-direct the (*read) to the Xen emulated one.
> 
>  3) Removes the work-around.
> 
> Please note, that the existing interface (136d249) can be used to do 2) as well. But the

.. If the __ioapic_init_mappings is made visible (so that we can call it in the Xen's
version of io_apic_ops.init() - as we want to re-use as much as possible of the generic
code:

commit fa45ea06ab785ce82644980befc7e983f884f72a
Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date:   Mon Apr 16 14:50:02 2012 -0400

    x86/io_apic: Make __ioapic_init_mappings visible to other sub-systems.
    
    This way, we can re-use as much as possible of the generic code as possible
    and re-use the generic initialization.
    
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2c4943d..e75979c 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -157,6 +157,7 @@ extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
 extern void ioapic_and_gsi_init(void);
+extern void __ioapic_init_mappings(void);
 extern void ioapic_insert_resources(void);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
@@ -191,6 +192,7 @@ extern void disable_ioapic_support(void);
 #define setup_ioapic_ids_from_mpc x86_init_noop
 static const int timer_through_8259 = 0;
 static inline void ioapic_and_gsi_init(void) { }
+static inline void __ioapic_init_mappings(void) { }
 static inline void ioapic_insert_resources(void) { }
 #define gsi_top (NR_IRQS_LEGACY)
 static inline int mp_find_ioapic(u32 gsi) { return 0; }
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d..58e6986 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -68,8 +68,6 @@
 #define for_each_irq_pin(entry, head) \
 	for (entry = head; entry; entry = entry->next)
 
-static void		__init __ioapic_init_mappings(void);
-
 static unsigned int	__io_apic_read  (unsigned int apic, unsigned int reg);
 static void		__io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
 static void		__io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
@@ -3936,7 +3934,7 @@ void __init ioapic_and_gsi_init(void)
 	io_apic_ops.init();
 }
 
-static void __init __ioapic_init_mappings(void)
+void __init __ioapic_init_mappings(void)
 {
 	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
 	struct resource *ioapic_res;

Re: [GIT PULL] (xen) for stable/for-ingo-v3.5.v3 for v3.5

[Konrad Rzeszutek Wilk]

On Mon, Apr 16, 2012 at 02:40:13PM -0400, Konrad Rzeszutek Wilk wrote:
> Hey Ingo,
> 
> Please git pull the following branch for v3.5:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-ingo-v3.5.v3
> 
> It has the proper fix for the IO-APIC having 0xfffff... contents when booting under Xen.
> 
> Compared to the patch you have already in the tree (136d249ef7dbf0fefa292082cc40be1ea864cbd6
>  x86/ioapic: Add io_apic_ops driver layer to allow interception) it does three things:
> 
>  1) Exposes the io_apic baremetal functions and uses the x86_io_apic_ops function table
>     instead of keeping it in the io_apic. This makes the code fit within the rest of
>     x86_ops functions.
> 
>  2) Use the x86_io_apic_ops to re-direct the (*read) to the Xen emulated one.
> 
>  3) Removes the work-around.
> 
> Please note, that the existing interface (136d249) can be used to do 2) as well. But the

.. If the __ioapic_init_mappings is made visible (so that we can call it in the Xen's
version of io_apic_ops.init() - as we want to re-use as much as possible of the generic
code:

commit fa45ea06ab785ce82644980befc7e983f884f72a
Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date:   Mon Apr 16 14:50:02 2012 -0400

    x86/io_apic: Make __ioapic_init_mappings visible to other sub-systems.
    
    This way, we can re-use as much as possible of the generic code as possible
    and re-use the generic initialization.
    
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2c4943d..e75979c 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -157,6 +157,7 @@ extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
 extern void ioapic_and_gsi_init(void);
+extern void __ioapic_init_mappings(void);
 extern void ioapic_insert_resources(void);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
@@ -191,6 +192,7 @@ extern void disable_ioapic_support(void);
 #define setup_ioapic_ids_from_mpc x86_init_noop
 static const int timer_through_8259 = 0;
 static inline void ioapic_and_gsi_init(void) { }
+static inline void __ioapic_init_mappings(void) { }
 static inline void ioapic_insert_resources(void) { }
 #define gsi_top (NR_IRQS_LEGACY)
 static inline int mp_find_ioapic(u32 gsi) { return 0; }
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d..58e6986 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -68,8 +68,6 @@
 #define for_each_irq_pin(entry, head) \
 	for (entry = head; entry; entry = entry->next)
 
-static void		__init __ioapic_init_mappings(void);
-
 static unsigned int	__io_apic_read  (unsigned int apic, unsigned int reg);
 static void		__io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
 static void		__io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
@@ -3936,7 +3934,7 @@ void __init ioapic_and_gsi_init(void)
 	io_apic_ops.init();
 }
 
-static void __init __ioapic_init_mappings(void)
+void __init __ioapic_init_mappings(void)
 {
 	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
 	struct resource *ioapic_res;