Merge tag 's390-5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:

 - A copy of Arnds compat wrapper generation series

 - Pass information about the KVM guest to the host in form the control
   program code and the control program version code

 - Map IOV resources to support PCI physical functions on s390

 - Add vector load and store alignment hints to improve performance

 - Use the "jdd" constraint with gcc 9 to make jump labels working again

 - Remove amode workaround for old z/VM releases from the DCSS code

 - Add support for in-kernel performance measurements using the CPU
   measurement counter facility

 - Introduce a new PMU device cpum_cf_diag to capture counters and store
   thenn as event raw data.

 - Bug fixes and cleanups

* tag 's390-5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (54 commits)
  Revert "s390/cpum_cf: Add kernel message exaplanations"
  s390/dasd: fix read device characteristic with CONFIG_VMAP_STACK=y
  s390/suspend: fix prefix register reset in swsusp_arch_resume
  s390: warn about clearing als implied facilities
  s390: allow overriding facilities via command line
  s390: clean up redundant facilities list setup
  s390/als: remove duplicated in-place implementation of stfle
  s390/cio: Use cpa range elsewhere within vfio-ccw
  s390/cio: Fix vfio-ccw handling of recursive TICs
  s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem
  s390/cpum_cf: Handle EBUSY return code from CPU counter facility reservation
  s390/cpum_cf: Add kernel message exaplanations
  s390/cpum_cf_diag: Add support for s390 counter facility diagnostic trace
  s390/cpum_cf: add ctr_stcctm() function
  s390/cpum_cf: move common functions into a separate file
  s390/cpum_cf: introduce kernel_cpumcf_avail() function
  s390/cpu_mf: replace stcctm5() with the stcctm() function
  s390/cpu_mf: add store cpu counter multiple instruction support
  s390/cpum_cf: Add minimal in-kernel interface for counter measurements
  s390/cpum_cf: introduce kernel_cpumcf_alert() to obtain measurement alerts
  ...

1 files changed, 42 insertions, 18 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 7ed90a759135..12934e8fbb91 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -369,7 +369,7 @@ void __init arch_call_rest_init(void)
 		: : [_frame] "a" (frame));
 }
 
-static void __init setup_lowcore(void)
+static void __init setup_lowcore_dat_off(void)
 {
 	struct lowcore *lc;
 
@@ -380,19 +380,16 @@ static void __init setup_lowcore(void)
 	lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
 	lc->restart_psw.mask = PSW_KERNEL_BITS;
 	lc->restart_psw.addr = (unsigned long) restart_int_handler;
-	lc->external_new_psw.mask = PSW_KERNEL_BITS |
-		PSW_MASK_DAT | PSW_MASK_MCHECK;
+	lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 	lc->external_new_psw.addr = (unsigned long) ext_int_handler;
 	lc->svc_new_psw.mask = PSW_KERNEL_BITS |
-		PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
+		PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
 	lc->svc_new_psw.addr = (unsigned long) system_call;
-	lc->program_new_psw.mask = PSW_KERNEL_BITS |
-		PSW_MASK_DAT | PSW_MASK_MCHECK;
+	lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 	lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
 	lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 	lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
-	lc->io_new_psw.mask = PSW_KERNEL_BITS |
-		PSW_MASK_DAT | PSW_MASK_MCHECK;
+	lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
 	lc->io_new_psw.addr = (unsigned long) io_int_handler;
 	lc->clock_comparator = clock_comparator_max;
 	lc->nodat_stack = ((unsigned long) &init_thread_union)
@@ -452,6 +449,16 @@ static void __init setup_lowcore(void)
 	lowcore_ptr[0] = lc;
 }
 
+static void __init setup_lowcore_dat_on(void)
+{
+	__ctl_clear_bit(0, 28);
+	S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
+	S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
+	S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
+	S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
+	__ctl_set_bit(0, 28);
+}
+
 static struct resource code_resource = {
 	.name  = "Kernel code",
 	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
@@ -794,18 +801,9 @@ static void __init reserve_kernel(void)
 {
 	unsigned long start_pfn = PFN_UP(__pa(_end));
 
-#ifdef CONFIG_DMA_API_DEBUG
-	/*
-	 * DMA_API_DEBUG code stumbles over addresses from the
-	 * range [PARMAREA_END, _stext]. Mark the memory as reserved
-	 * so it is not used for CONFIG_DMA_API_DEBUG=y.
-	 */
-	memblock_reserve(0, PFN_PHYS(start_pfn));
-#else
 	memblock_reserve(0, PARMAREA_END);
 	memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
 			 - (unsigned long)_stext);
-#endif
 }
 
 static void __init setup_memory(void)
@@ -990,6 +988,25 @@ static void __init setup_task_size(void)
 }
 
 /*
+ * Issue diagnose 318 to set the control program name and
+ * version codes.
+ */
+static void __init setup_control_program_code(void)
+{
+	union diag318_info diag318_info = {
+		.cpnc = CPNC_LINUX,
+		.cpvc_linux = 0,
+		.cpvc_distro = {0},
+	};
+
+	if (!sclp.has_diag318)
+		return;
+
+	diag_stat_inc(DIAG_STAT_X318);
+	asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
+}
+
+/*
  * Setup function called from init/main.c just after the banner
  * was printed.
  */
@@ -1033,6 +1050,7 @@ void __init setup_arch(char **cmdline_p)
 	os_info_init();
 	setup_ipl();
 	setup_task_size();
+	setup_control_program_code();
 
 	/* Do some memory reservations *before* memory is added to memblock */
 	reserve_memory_end();
@@ -1072,7 +1090,7 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
 	setup_resources();
-	setup_lowcore();
+	setup_lowcore_dat_off();
 	smp_fill_possible_mask();
 	cpu_detect_mhz_feature();
         cpu_init();
@@ -1085,6 +1103,12 @@ void __init setup_arch(char **cmdline_p)
 	 */
         paging_init();
 
+	/*
+	 * After paging_init created the kernel page table, the new PSWs
+	 * in lowcore can now run with DAT enabled.
+	 */
+	setup_lowcore_dat_on();
+
         /* Setup default console */
 	conmode_default();
 	set_preferred_console();