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>

3 files changed, 47 insertions, 9 deletions

diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 4da22b2f0521..edb5161df7e2 100644
--- 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 9cd85adaa7c1..d038c8cea6cb 100644
--- 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 295bfb7124bc..ff3364a067ff 100644
--- 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);