linux-kernel - [PATCH] s390: fix detection of vector enhancements facility 1 vs. vector packed decimal facility

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Message-Id: <20210503121244.25232-1-david@redhat.com>
Date:   Mon,  3 May 2021 14:12:44 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        linux-s390@...r.kernel.org
Subject: [PATCH] s390: fix detection of vector enhancements facility 1 vs. vector packed decimal facility

The PoP documents:
	134: The vector packed decimal facility is installed in the
	     z/Architecture architectural mode. When bit 134 is
	     one, bit 129 is also one.
	135: The vector enhancements facility 1 is installed in
	     the z/Architecture architectural mode. When bit 135
	     is one, bit 129 is also one.

Looks like we confuse the vector enhancements facility 1 ("EXT") with the
Vector packed decimal facility ("BCD"). Let's fix the facility checks.

Detected while working on QEMU/tcg z14 support and only unlocking
the vector enhancements facility 1, but not the vector packed decimal
facility.

Fixes: 2583b848cad0 ("s390: report new vector facilities")
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: Alexander Egorenkov <egorenar@...ux.ibm.com>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Janosch Frank <frankja@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 arch/s390/kernel/setup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 72134f9f6ff5..5aab59ad5688 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -937,9 +937,9 @@ static int __init setup_hwcaps(void)
 	if (MACHINE_HAS_VX) {
 		elf_hwcap |= HWCAP_S390_VXRS;
 		if (test_facility(134))
-			elf_hwcap |= HWCAP_S390_VXRS_EXT;
-		if (test_facility(135))
 			elf_hwcap |= HWCAP_S390_VXRS_BCD;
+		if (test_facility(135))
+			elf_hwcap |= HWCAP_S390_VXRS_EXT;
 		if (test_facility(148))
 			elf_hwcap |= HWCAP_S390_VXRS_EXT2;
 		if (test_facility(152))
-- 
2.30.2