s390: fix initrd corruptions with gcov/kcov instrumented kernels

The early C code within arch/s390/kernel/early.c saves ipl parameters
before the bss section is cleared. When doing that it jumps to code
that is potentially gcov/kcov instrumented. That code in turn will
corrupt an initrd that potentially may reside in the not yet ready to
be used bss section.

Instead of excluding more and more code from gcov/kcov instrumentation
provide an early memmove function which will be used to save ipl
parameters. The verification if these parameters are actually valid
will be done later.

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 4da22b2f0521a6822aa61f92e09f9544489304b9..edb5161df7e2945831f9697f676a24e0e8582450 100644 (file)
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -97,7 +97,7 @@ void __init save_area_add_vxrs(struct save_area *, __vector128 *vxrs);
 extern void do_reipl(void);
 extern void do_halt(void);
 extern void do_poff(void);
-extern void ipl_save_parameters(void);
+extern void ipl_verify_parameters(void);
 extern void ipl_update_parameters(void);
 extern size_t append_ipl_vmparm(char *, size_t);
 extern size_t append_ipl_scpdata(char *, size_t);

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9cd85adaa7c1473172ff18c81c8a2ae953e0beae..d038c8cea6cb33cdf9880dd4680f56bf183d40bf 100644 (file)
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -392,7 +392,49 @@ static int __init cad_init(void)
 }
 early_initcall(cad_init);
 
-static __init void rescue_initrd(void)
+static __init void memmove_early(void *dst, const void *src, size_t n)
+{
+       unsigned long addr;
+       long incr;
+       psw_t old;
+
+       if (!n)
+               return;
+       incr = 1;
+       if (dst > src) {
+               incr = -incr;
+               dst += n - 1;
+               src += n - 1;
+       }
+       old = S390_lowcore.program_new_psw;
+       S390_lowcore.program_new_psw.mask = __extract_psw();
+       asm volatile(
+               "       larl    %[addr],1f\n"
+               "       stg     %[addr],%[psw_pgm_addr]\n"
+               "0:     mvc     0(1,%[dst]),0(%[src])\n"
+               "       agr     %[dst],%[incr]\n"
+               "       agr     %[src],%[incr]\n"
+               "       brctg   %[n],0b\n"
+               "1:\n"
+               : [addr] "=&d" (addr),
+                 [psw_pgm_addr] "=&Q" (S390_lowcore.program_new_psw.addr),
+                 [dst] "+&a" (dst), [src] "+&a" (src),  [n] "+d" (n)
+               : [incr] "d" (incr)
+               : "cc", "memory");
+       S390_lowcore.program_new_psw = old;
+}
+
+static __init noinline void ipl_save_parameters(void)
+{
+       void *src, *dst;
+
+       src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
+       dst = (void *) IPL_PARMBLOCK_ORIGIN;
+       memmove_early(dst, src, PAGE_SIZE);
+       S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
+}
+
+static __init noinline void rescue_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD
        unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
@@ -406,7 +448,7 @@ static __init void rescue_initrd(void)
                return;
        if (INITRD_START >= min_initrd_addr)
                return;
-       memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
+       memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
        INITRD_START = min_initrd_addr;
 #endif
 }
@@ -468,6 +510,7 @@ void __init startup_init(void)
        ipl_save_parameters();
        rescue_initrd();
        clear_bss_section();
+       ipl_verify_parameters();
        time_early_init();
        init_kernel_storage_key();
        lockdep_off();

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 295bfb7124bcac7a55b71fedb0e9f55a96b7e1ad..ff3364a067ff73f42678cb95ae28023472e48b85 100644 (file)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1991,10 +1991,9 @@ void __init ipl_update_parameters(void)
                diag308_set_works = 1;
 }
 
-void __init ipl_save_parameters(void)
+void __init ipl_verify_parameters(void)
 {
        struct cio_iplinfo iplinfo;
-       void *src, *dst;
 
        if (cio_get_iplinfo(&iplinfo))
                return;
@@ -2005,10 +2004,6 @@ void __init ipl_save_parameters(void)
        if (!iplinfo.is_qdio)
                return;
        ipl_flags |= IPL_PARMBLOCK_VALID;
-       src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
-       dst = (void *)IPL_PARMBLOCK_ORIGIN;
-       memmove(dst, src, PAGE_SIZE);
-       S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
 }
 
 static LIST_HEAD(rcall);