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Commit 42976ad0 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Peter Anvin:
 "One (hopefully) last batch of x86 fixes.  You asked for the patch by
  patch justifications, so here they are:

      x86, MCE: Retract most UAPI exports

   This one unexports from userspace a bunch of definitions which should
   never have been exported.  We really don't want to create an
   accidental legacy here.

      x86, doc: Add a bootloader ID for OVMF

   This is a documentation-only patch, just recording the official
   assignment of a boot loader ID.

      x86: Do not leak kernel page mapping locations

   Security: avoid making it needlessly easy for user space to probe the
   kernel memory layout.

      x86/mm: Check if PUD is large when validating a kernel address

   Prevent failures using /proc/kcore when using 1G pages.

      x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems

   Works around a BIOS problem causing boot failures on affected hardware."

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Check if PUD is large when validating a kernel address
  x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems
  x86, doc: Add a bootloader ID for OVMF
  x86: Do not leak kernel page mapping locations
  x86, MCE: Retract most UAPI exports
parents ecf223fc 0ee364eb

Documentation/x86/boot.txt

+1 −0
Original line number Diff line number Diff line
@@ -390,6 +390,7 @@ Protocol: 2.00+ 
	F  Special		(0xFF = undefined)

       10  Reserved

       11  Minimal Linux Bootloader <http://sebastian-plotz.blogspot.de>

       12  OVMF UEFI virtualization stack



  Please contact <hpa@zytor.com> if you need a bootloader ID

  value assigned.

arch/x86/include/asm/mce.h

+84 −0
Original line number Diff line number Diff line
@@ -3,6 +3,90 @@ 


#include <uapi/asm/mce.h>



/*

 * Machine Check support for x86

 */



/* MCG_CAP register defines */

#define MCG_BANKCNT_MASK	0xff         /* Number of Banks */

#define MCG_CTL_P		(1ULL<<8)    /* MCG_CTL register available */

#define MCG_EXT_P		(1ULL<<9)    /* Extended registers available */

#define MCG_CMCI_P		(1ULL<<10)   /* CMCI supported */

#define MCG_EXT_CNT_MASK	0xff0000     /* Number of Extended registers */

#define MCG_EXT_CNT_SHIFT	16

#define MCG_EXT_CNT(c)		(((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)

#define MCG_SER_P		(1ULL<<24)   /* MCA recovery/new status bits */



/* MCG_STATUS register defines */

#define MCG_STATUS_RIPV  (1ULL<<0)   /* restart ip valid */

#define MCG_STATUS_EIPV  (1ULL<<1)   /* ip points to correct instruction */

#define MCG_STATUS_MCIP  (1ULL<<2)   /* machine check in progress */



/* MCi_STATUS register defines */

#define MCI_STATUS_VAL   (1ULL<<63)  /* valid error */

#define MCI_STATUS_OVER  (1ULL<<62)  /* previous errors lost */

#define MCI_STATUS_UC    (1ULL<<61)  /* uncorrected error */

#define MCI_STATUS_EN    (1ULL<<60)  /* error enabled */

#define MCI_STATUS_MISCV (1ULL<<59)  /* misc error reg. valid */

#define MCI_STATUS_ADDRV (1ULL<<58)  /* addr reg. valid */

#define MCI_STATUS_PCC   (1ULL<<57)  /* processor context corrupt */

#define MCI_STATUS_S	 (1ULL<<56)  /* Signaled machine check */

#define MCI_STATUS_AR	 (1ULL<<55)  /* Action required */

#define MCACOD		  0xffff     /* MCA Error Code */



/* Architecturally defined codes from SDM Vol. 3B Chapter 15 */

#define MCACOD_SCRUB	0x00C0	/* 0xC0-0xCF Memory Scrubbing */

#define MCACOD_SCRUBMSK	0xfff0

#define MCACOD_L3WB	0x017A	/* L3 Explicit Writeback */

#define MCACOD_DATA	0x0134	/* Data Load */

#define MCACOD_INSTR	0x0150	/* Instruction Fetch */



/* MCi_MISC register defines */

#define MCI_MISC_ADDR_LSB(m)	((m) & 0x3f)

#define MCI_MISC_ADDR_MODE(m)	(((m) >> 6) & 7)

#define  MCI_MISC_ADDR_SEGOFF	0	/* segment offset */

#define  MCI_MISC_ADDR_LINEAR	1	/* linear address */

#define  MCI_MISC_ADDR_PHYS	2	/* physical address */

#define  MCI_MISC_ADDR_MEM	3	/* memory address */

#define  MCI_MISC_ADDR_GENERIC	7	/* generic */



/* CTL2 register defines */

#define MCI_CTL2_CMCI_EN		(1ULL << 30)

#define MCI_CTL2_CMCI_THRESHOLD_MASK	0x7fffULL



#define MCJ_CTX_MASK		3

#define MCJ_CTX(flags)		((flags) & MCJ_CTX_MASK)

#define MCJ_CTX_RANDOM		0    /* inject context: random */

#define MCJ_CTX_PROCESS		0x1  /* inject context: process */

#define MCJ_CTX_IRQ		0x2  /* inject context: IRQ */

#define MCJ_NMI_BROADCAST	0x4  /* do NMI broadcasting */

#define MCJ_EXCEPTION		0x8  /* raise as exception */

#define MCJ_IRQ_BRAODCAST	0x10 /* do IRQ broadcasting */



#define MCE_OVERFLOW 0		/* bit 0 in flags means overflow */



/* Software defined banks */

#define MCE_EXTENDED_BANK	128

#define MCE_THERMAL_BANK	(MCE_EXTENDED_BANK + 0)

#define K8_MCE_THRESHOLD_BASE   (MCE_EXTENDED_BANK + 1)



#define MCE_LOG_LEN 32

#define MCE_LOG_SIGNATURE	"MACHINECHECK"



/*

 * This structure contains all data related to the MCE log.  Also

 * carries a signature to make it easier to find from external

 * debugging tools.  Each entry is only valid when its finished flag

 * is set.

 */

struct mce_log {

	char signature[12]; /* "MACHINECHECK" */

	unsigned len;	    /* = MCE_LOG_LEN */

	unsigned next;

	unsigned flags;

	unsigned recordlen;	/* length of struct mce */

	struct mce entry[MCE_LOG_LEN];

};



struct mca_config {

	bool dont_log_ce;

arch/x86/include/asm/pgtable.h

+5 −0
Original line number Diff line number Diff line
@@ -142,6 +142,11 @@ static inline unsigned long pmd_pfn(pmd_t pmd) 
	return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;

}



static inline unsigned long pud_pfn(pud_t pud)

{

	return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;

}



#define pte_page(pte)	pfn_to_page(pte_pfn(pte))



static inline int pmd_large(pmd_t pte)

arch/x86/include/uapi/asm/mce.h

+0 −87
Original line number Diff line number Diff line
@@ -4,66 +4,6 @@ 
#include <linux/types.h>

#include <asm/ioctls.h>



/*

 * Machine Check support for x86

 */



/* MCG_CAP register defines */

#define MCG_BANKCNT_MASK	0xff         /* Number of Banks */

#define MCG_CTL_P		(1ULL<<8)    /* MCG_CTL register available */

#define MCG_EXT_P		(1ULL<<9)    /* Extended registers available */

#define MCG_CMCI_P		(1ULL<<10)   /* CMCI supported */

#define MCG_EXT_CNT_MASK	0xff0000     /* Number of Extended registers */

#define MCG_EXT_CNT_SHIFT	16

#define MCG_EXT_CNT(c)		(((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)

#define MCG_SER_P	 	(1ULL<<24)   /* MCA recovery/new status bits */



/* MCG_STATUS register defines */

#define MCG_STATUS_RIPV  (1ULL<<0)   /* restart ip valid */

#define MCG_STATUS_EIPV  (1ULL<<1)   /* ip points to correct instruction */

#define MCG_STATUS_MCIP  (1ULL<<2)   /* machine check in progress */



/* MCi_STATUS register defines */

#define MCI_STATUS_VAL   (1ULL<<63)  /* valid error */

#define MCI_STATUS_OVER  (1ULL<<62)  /* previous errors lost */

#define MCI_STATUS_UC    (1ULL<<61)  /* uncorrected error */

#define MCI_STATUS_EN    (1ULL<<60)  /* error enabled */

#define MCI_STATUS_MISCV (1ULL<<59)  /* misc error reg. valid */

#define MCI_STATUS_ADDRV (1ULL<<58)  /* addr reg. valid */

#define MCI_STATUS_PCC   (1ULL<<57)  /* processor context corrupt */

#define MCI_STATUS_S	 (1ULL<<56)  /* Signaled machine check */

#define MCI_STATUS_AR	 (1ULL<<55)  /* Action required */

#define MCACOD		  0xffff     /* MCA Error Code */



/* Architecturally defined codes from SDM Vol. 3B Chapter 15 */

#define MCACOD_SCRUB	0x00C0	/* 0xC0-0xCF Memory Scrubbing */

#define MCACOD_SCRUBMSK	0xfff0

#define MCACOD_L3WB	0x017A	/* L3 Explicit Writeback */

#define MCACOD_DATA	0x0134	/* Data Load */

#define MCACOD_INSTR	0x0150	/* Instruction Fetch */



/* MCi_MISC register defines */

#define MCI_MISC_ADDR_LSB(m)	((m) & 0x3f)

#define MCI_MISC_ADDR_MODE(m)	(((m) >> 6) & 7)

#define  MCI_MISC_ADDR_SEGOFF	0	/* segment offset */

#define  MCI_MISC_ADDR_LINEAR	1	/* linear address */

#define  MCI_MISC_ADDR_PHYS	2	/* physical address */

#define  MCI_MISC_ADDR_MEM	3	/* memory address */

#define  MCI_MISC_ADDR_GENERIC	7	/* generic */



/* CTL2 register defines */

#define MCI_CTL2_CMCI_EN		(1ULL << 30)

#define MCI_CTL2_CMCI_THRESHOLD_MASK	0x7fffULL



#define MCJ_CTX_MASK		3

#define MCJ_CTX(flags)		((flags) & MCJ_CTX_MASK)

#define MCJ_CTX_RANDOM		0    /* inject context: random */

#define MCJ_CTX_PROCESS		0x1  /* inject context: process */

#define MCJ_CTX_IRQ		0x2  /* inject context: IRQ */

#define MCJ_NMI_BROADCAST	0x4  /* do NMI broadcasting */

#define MCJ_EXCEPTION		0x8  /* raise as exception */

#define MCJ_IRQ_BRAODCAST	0x10 /* do IRQ broadcasting */



/* Fields are zero when not available */

struct mce {

	__u64 status;
@@ -87,35 +27,8 @@ struct mce { 
	__u64 mcgcap;	/* MCGCAP MSR: machine check capabilities of CPU */

};



/*

 * This structure contains all data related to the MCE log.  Also

 * carries a signature to make it easier to find from external

 * debugging tools.  Each entry is only valid when its finished flag

 * is set.

 */



#define MCE_LOG_LEN 32



struct mce_log {

	char signature[12]; /* "MACHINECHECK" */

	unsigned len;	    /* = MCE_LOG_LEN */

	unsigned next;

	unsigned flags;

	unsigned recordlen;	/* length of struct mce */

	struct mce entry[MCE_LOG_LEN];

};



#define MCE_OVERFLOW 0		/* bit 0 in flags means overflow */



#define MCE_LOG_SIGNATURE	"MACHINECHECK"



#define MCE_GET_RECORD_LEN   _IOR('M', 1, int)

#define MCE_GET_LOG_LEN      _IOR('M', 2, int)

#define MCE_GETCLEAR_FLAGS   _IOR('M', 3, int)



/* Software defined banks */

#define MCE_EXTENDED_BANK	128

#define MCE_THERMAL_BANK	MCE_EXTENDED_BANK + 0

#define K8_MCE_THRESHOLD_BASE      (MCE_EXTENDED_BANK + 1)



#endif /* _UAPI_ASM_X86_MCE_H */

arch/x86/kernel/apic/x2apic_phys.c

+11 −10
Original line number Diff line number Diff line
@@ -20,18 +20,19 @@ static int set_x2apic_phys_mode(char *arg) 
}

early_param("x2apic_phys", set_x2apic_phys_mode);



static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)

static bool x2apic_fadt_phys(void)

{

	if (x2apic_phys)

		return x2apic_enabled();

	else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&

		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) &&

		x2apic_enabled()) {

	if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&

		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {

		printk(KERN_DEBUG "System requires x2apic physical mode\n");

		return 1;

		return true;

	}

	else

		return 0;

	return false;

}



static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)

{

	return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());

}



static void
@@ -82,7 +83,7 @@ static void init_x2apic_ldr(void) 


static int x2apic_phys_probe(void)

{

	if (x2apic_mode && x2apic_phys)

	if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))

		return 1;



	return apic == &apic_x2apic_phys;