Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:

 - Improvements for the spectre defense:
    * The spectre related code is consolidated to a single file
      nospec-branch.c
    * Automatic enable/disable for the spectre v2 defenses (expoline vs.
      nobp)
    * Syslog messages for specve v2 are added
    * Enable CONFIG_GENERIC_CPU_VULNERABILITIES and define the attribute
      functions for spectre v1 and v2

 - Add helper macros for assembler alternatives and use them to shorten
   the code in entry.S.

 - Add support for persistent configuration data via the SCLP Store Data
   interface. The H/W interface requires a page table that uses 4K pages
   only, the code to setup such an address space is added as well.

 - Enable virtio GPU emulation in QEMU. To do this the depends
   statements for a few common Kconfig options are modified.

 - Add support for format-3 channel path descriptors and add a binary
   sysfs interface to export the associated utility strings.

 - Add a sysfs attribute to control the IFCC handling in case of
   constant channel errors.

 - The vfio-ccw changes from Cornelia.

 - Bug fixes and cleanups.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (40 commits)
  s390/kvm: improve stack frame constants in entry.S
  s390/lpp: use assembler alternatives for the LPP instruction
  s390/entry.S: use assembler alternatives
  s390: add assembler macros for CPU alternatives
  s390: add sysfs attributes for spectre
  s390: report spectre mitigation via syslog
  s390: add automatic detection of the spectre defense
  s390: move nobp parameter functions to nospec-branch.c
  s390/cio: add util_string sysfs attribute
  s390/chsc: query utility strings via fmt3 channel path descriptor
  s390/cio: rename struct channel_path_desc
  s390/cio: fix unbind of io_subchannel_driver
  s390/qdio: split up CCQ handling for EQBS / SQBS
  s390/qdio: don't retry EQBS after CCQ 96
  s390/qdio: restrict buffer merging to eligible devices
  s390/qdio: don't merge ERROR output buffers
  s390/qdio: simplify math in get_*_buffer_frontier()
  s390/decompressor: trim uncompressed image head during the build
  s390/crypto: Fix kernel crash on aes_s390 module remove.
  s390/defkeymap: fix global init to zero
  ...

11 files changed, 144 insertions, 33 deletions

diff --git a/arch/s390/include/asm/alternative-asm.h b/arch/s390/include/asm/alternative-asm.h
new file mode 100644
index 000000000000..955d620db23e
--- /dev/null
+++ b/arch/s390/include/asm/alternative-asm.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_ALTERNATIVE_ASM_H
+#define _ASM_S390_ALTERNATIVE_ASM_H
+
+#ifdef __ASSEMBLY__
+
+/*
+ * Check the length of an instruction sequence. The length may not be larger
+ * than 254 bytes and it has to be divisible by 2.
+ */
+.macro alt_len_check start,end
+        .if ( \end - \start ) > 254
+        .error "cpu alternatives does not support instructions blocks > 254 bytes\n"
+        .endif
+        .if ( \end - \start ) % 2
+        .error "cpu alternatives instructions length is odd\n"
+        .endif
+.endm
+
+/*
+ * Issue one struct alt_instr descriptor entry (need to put it into
+ * the section .altinstructions, see below). This entry contains
+ * enough information for the alternatives patching code to patch an
+ * instruction. See apply_alternatives().
+ */
+.macro alt_entry orig_start, orig_end, alt_start, alt_end, feature
+        .long   \orig_start - .
+        .long   \alt_start - .
+        .word   \feature
+        .byte   \orig_end - \orig_start
+        .byte   \alt_end - \alt_start
+.endm
+
+/*
+ * Fill up @bytes with nops. The macro emits 6-byte nop instructions
+ * for the bulk of the area, possibly followed by a 4-byte and/or
+ * a 2-byte nop if the size of the area is not divisible by 6.
+ */
+.macro alt_pad_fill bytes
+        .fill   ( \bytes ) / 6, 6, 0xc0040000
+        .fill   ( \bytes ) % 6 / 4, 4, 0x47000000
+        .fill   ( \bytes ) % 6 % 4 / 2, 2, 0x0700
+.endm
+
+/*
+ * Fill up @bytes with nops. If the number of bytes is larger
+ * than 6, emit a jg instruction to branch over all nops, then
+ * fill an area of size (@bytes - 6) with nop instructions.
+ */
+.macro alt_pad bytes
+        .if ( \bytes > 0 )
+        .if ( \bytes > 6 )
+        jg      . + \bytes
+        alt_pad_fill \bytes - 6
+        .else
+        alt_pad_fill \bytes
+        .endif
+        .endif
+.endm
+
+/*
+ * Define an alternative between two instructions. If @feature is
+ * present, early code in apply_alternatives() replaces @oldinstr with
+ * @newinstr. ".skip" directive takes care of proper instruction padding
+ * in case @newinstr is longer than @oldinstr.
+ */
+.macro ALTERNATIVE oldinstr, newinstr, feature
+        .pushsection .altinstr_replacement,"ax"
+770:    \newinstr
+771:    .popsection
+772:    \oldinstr
+773:    alt_len_check 770b, 771b
+        alt_len_check 772b, 773b
+        alt_pad ( ( 771b - 770b ) - ( 773b - 772b ) )
+774:    .pushsection .altinstructions,"a"
+        alt_entry 772b, 774b, 770b, 771b, \feature
+        .popsection
+.endm
+
+/*
+ * Define an alternative between two instructions. If @feature is
+ * present, early code in apply_alternatives() replaces @oldinstr with
+ * @newinstr. ".skip" directive takes care of proper instruction padding
+ * in case @newinstr is longer than @oldinstr.
+ */
+.macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2
+        .pushsection .altinstr_replacement,"ax"
+770:    \newinstr1
+771:    \newinstr2
+772:    .popsection
+773:    \oldinstr
+774:    alt_len_check 770b, 771b
+        alt_len_check 771b, 772b
+        alt_len_check 773b, 774b
+        .if ( 771b - 770b > 772b - 771b )
+        alt_pad ( ( 771b - 770b ) - ( 774b - 773b ) )
+        .else
+        alt_pad ( ( 772b - 771b ) - ( 774b - 773b ) )
+        .endif
+775:    .pushsection .altinstructions,"a"
+        alt_entry 773b, 775b, 770b, 771b,\feature1
+        alt_entry 773b, 775b, 771b, 772b,\feature2
+        .popsection
+.endm
+
+#endif  /*  __ASSEMBLY__  */
+
+#endif /* _ASM_S390_ALTERNATIVE_ASM_H */
diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index 633f8da86137..20bce136b2e5 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -230,5 +230,5 @@ int ccw_device_siosl(struct ccw_device *);
 
 extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
 
-struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *, int);
+struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
 #endif /* _S390_CCWDEV_H_ */
diff --git a/arch/s390/include/asm/chpid.h b/arch/s390/include/asm/chpid.h
index 4773f747915c..20e0d22f29e9 100644
--- a/arch/s390/include/asm/chpid.h
+++ b/arch/s390/include/asm/chpid.h
@@ -9,7 +9,7 @@
 #include <uapi/asm/chpid.h>
 #include <asm/cio.h>
 
-struct channel_path_desc {
+struct channel_path_desc_fmt0 {
         u8 flags;
         u8 lsn;
         u8 desc;
diff --git a/arch/s390/include/asm/cio.h b/arch/s390/include/asm/cio.h
index dc84a0171bb3..847a04262b9c 100644
--- a/arch/s390/include/asm/cio.h
+++ b/arch/s390/include/asm/cio.h
@@ -227,7 +227,7 @@ struct esw_eadm {
  * a field is valid; a field not being valid is always passed as %0.
  * If a unit check occurred, @ecw may contain sense data; this is retrieved
  * by the common I/O layer itself if the device doesn't support concurrent
- * sense (so that the device driver never needs to perform basic sene itself).
+ * sense (so that the device driver never needs to perform basic sense itself).
  * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
  * if applicable).
  */
diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h
index dd08db491b89..f58d17e9dd65 100644
--- a/arch/s390/include/asm/cpu_mf.h
+++ b/arch/s390/include/asm/cpu_mf.h
@@ -29,12 +29,12 @@
 /* CPU measurement facility support */
 static inline int cpum_cf_avail(void)
 {
-        return MACHINE_HAS_LPP && test_facility(67);
+        return test_facility(40) && test_facility(67);
 }
 
 static inline int cpum_sf_avail(void)
 {
-        return MACHINE_HAS_LPP && test_facility(68);
+        return test_facility(40) && test_facility(68);
 }
 
 
diff --git a/arch/s390/include/asm/css_chars.h b/arch/s390/include/asm/css_chars.h
index fb56fa3283a2..0563fd3e8458 100644
--- a/arch/s390/include/asm/css_chars.h
+++ b/arch/s390/include/asm/css_chars.h
@@ -32,8 +32,10 @@ struct css_general_char {
         u32 fcx : 1;     /* bit 88 */
         u32 : 19;
         u32 alt_ssi : 1; /* bit 108 */
-        u32:1;
-        u32 narf:1;      /* bit 110 */
+        u32 : 1;
+        u32 narf : 1;    /* bit 110 */
+        u32 : 12;
+        u32 util_str : 1;/* bit 123 */
 } __packed;
 
 extern struct css_general_char css_general_characteristics;
diff --git a/arch/s390/include/asm/nospec-branch.h b/arch/s390/include/asm/nospec-branch.h
index 7df48e5cf36f..35bf28fe4c64 100644
--- a/arch/s390/include/asm/nospec-branch.h
+++ b/arch/s390/include/asm/nospec-branch.h
@@ -6,12 +6,10 @@
 
 #include <linux/types.h>
 
-extern int nospec_call_disable;
-extern int nospec_return_disable;
+extern int nospec_disable;
 
 void nospec_init_branches(void);
-void nospec_call_revert(s32 *start, s32 *end);
-void nospec_return_revert(s32 *start, s32 *end);
+void nospec_revert(s32 *start, s32 *end);
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index c7b4333d1de0..f0f9bcf94c03 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -151,4 +151,7 @@ void vmem_map_init(void);
 void *vmem_crst_alloc(unsigned long val);
 pte_t *vmem_pte_alloc(void);
 
+unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
+void base_asce_free(unsigned long asce);
+
 #endif /* _S390_PGALLOC_H */
diff --git a/arch/s390/include/asm/scsw.h b/arch/s390/include/asm/scsw.h
index 79b7ffa91832..c00f7b031628 100644
--- a/arch/s390/include/asm/scsw.h
+++ b/arch/s390/include/asm/scsw.h
@@ -390,10 +390,10 @@ static inline int scsw_cmd_is_valid_key(union scsw *scsw)
 }
 
 /**
- * scsw_cmd_is_valid_sctl - check fctl field validity
+ * scsw_cmd_is_valid_sctl - check sctl field validity
  * @scsw: pointer to scsw
  *
- * Return non-zero if the fctl field of the specified command mode scsw is
+ * Return non-zero if the sctl field of the specified command mode scsw is
  * valid, zero otherwise.
  */
 static inline int scsw_cmd_is_valid_sctl(union scsw *scsw)
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 2eb0c8a7b664..124154fdfc97 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -25,7 +25,6 @@
 #define MACHINE_FLAG_DIAG44     _BITUL(6)
 #define MACHINE_FLAG_EDAT1      _BITUL(7)
 #define MACHINE_FLAG_EDAT2      _BITUL(8)
-#define MACHINE_FLAG_LPP        _BITUL(9)
 #define MACHINE_FLAG_TOPOLOGY   _BITUL(10)
 #define MACHINE_FLAG_TE         _BITUL(11)
 #define MACHINE_FLAG_TLB_LC     _BITUL(12)
@@ -66,7 +65,6 @@ extern void detect_memory_memblock(void);
 #define MACHINE_HAS_DIAG44      (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG44)
 #define MACHINE_HAS_EDAT1       (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT1)
 #define MACHINE_HAS_EDAT2       (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT2)
-#define MACHINE_HAS_LPP         (S390_lowcore.machine_flags & MACHINE_FLAG_LPP)
 #define MACHINE_HAS_TOPOLOGY    (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
 #define MACHINE_HAS_TE          (S390_lowcore.machine_flags & MACHINE_FLAG_TE)
 #define MACHINE_HAS_TLB_LC      (S390_lowcore.machine_flags & MACHINE_FLAG_TLB_LC)
diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h
index 451c601406b6..832be5c2584f 100644
--- a/arch/s390/include/uapi/asm/dasd.h
+++ b/arch/s390/include/uapi/asm/dasd.h
@@ -68,25 +68,27 @@ typedef struct dasd_information2_t {
 #define DASD_FORMAT_CDL  2
 /*
  * values to be used for dasd_information_t.features
- * 0x00: default features
- * 0x01: readonly (ro)
- * 0x02: use diag discipline (diag)
- * 0x04: set the device initially online (internal use only)
- * 0x08: enable ERP related logging
- * 0x10: allow I/O to fail on lost paths
- * 0x20: allow I/O to fail when a lock was stolen
- * 0x40: give access to raw eckd data
- * 0x80: enable discard support
+ * 0x100: default features
+ * 0x001: readonly (ro)
+ * 0x002: use diag discipline (diag)
+ * 0x004: set the device initially online (internal use only)
+ * 0x008: enable ERP related logging
+ * 0x010: allow I/O to fail on lost paths
+ * 0x020: allow I/O to fail when a lock was stolen
+ * 0x040: give access to raw eckd data
+ * 0x080: enable discard support
+ * 0x100: enable autodisable for IFCC errors (default)
  */
-#define DASD_FEATURE_DEFAULT         0x00
-#define DASD_FEATURE_READONLY        0x01
-#define DASD_FEATURE_USEDIAG         0x02
-#define DASD_FEATURE_INITIAL_ONLINE  0x04
-#define DASD_FEATURE_ERPLOG          0x08
-#define DASD_FEATURE_FAILFAST        0x10
-#define DASD_FEATURE_FAILONSLCK      0x20
-#define DASD_FEATURE_USERAW          0x40
-#define DASD_FEATURE_DISCARD         0x80
+#define DASD_FEATURE_READONLY         0x001
+#define DASD_FEATURE_USEDIAG          0x002
+#define DASD_FEATURE_INITIAL_ONLINE   0x004
+#define DASD_FEATURE_ERPLOG           0x008
+#define DASD_FEATURE_FAILFAST         0x010
+#define DASD_FEATURE_FAILONSLCK       0x020
+#define DASD_FEATURE_USERAW           0x040
+#define DASD_FEATURE_DISCARD          0x080
+#define DASD_FEATURE_PATH_AUTODISABLE 0x100
+#define DASD_FEATURE_DEFAULT          DASD_FEATURE_PATH_AUTODISABLE
 
 #define DASD_PARTN_BITS 2