linux-kernel - [PATCH 1/2] s390/hwcaps: Add HWCAP

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Date:   Fri,  1 Jul 2022 12:02:09 +0200
From:   Steffen Eiden <seiden@...ux.ibm.com>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     nrb@...ux.ibm.com
Subject: [PATCH 1/2] s390/hwcaps: Add HWCAP_UV

This patch adds a hardware capability for the Ultravisor.
This capability will be present if facility 158 is enabled.

Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
---
 arch/s390/include/asm/elf.h  | 2 ++
 arch/s390/kernel/processor.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
index 70a30ae258b7..3a5e89ce4fd0 100644
--- a/arch/s390/include/asm/elf.h
+++ b/arch/s390/include/asm/elf.h
@@ -115,6 +115,7 @@ enum {
 	HWCAP_NR_NNPA		= 20,
 	HWCAP_NR_PCI_MIO	= 21,
 	HWCAP_NR_SIE		= 22,
+	HWCAP_NR_UV		= 23,
 	HWCAP_NR_MAX
 };
 
@@ -142,6 +143,7 @@ enum {
 #define HWCAP_NNPA		BIT(HWCAP_NR_NNPA)
 #define HWCAP_PCI_MIO		BIT(HWCAP_NR_PCI_MIO)
 #define HWCAP_SIE		BIT(HWCAP_NR_SIE)
+#define HWCAP_UV		BIT(HWCAP_NR_UV)
 
 /*
  * These are used to set parameters in the core dumps.
diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c
index aa0e0e7fc773..80ccd57a2b00 100644
--- a/arch/s390/kernel/processor.c
+++ b/arch/s390/kernel/processor.c
@@ -141,6 +141,7 @@ static void show_cpu_summary(struct seq_file *m, void *v)
 		[HWCAP_NR_NNPA]		= "nnpa",
 		[HWCAP_NR_PCI_MIO]	= "pcimio",
 		[HWCAP_NR_SIE]		= "sie",
+		[HWCAP_NR_UV]		= "uv",
 	};
 	int i, cpu;
 
@@ -249,6 +250,10 @@ static int __init setup_hwcaps(void)
 	if (sclp.has_sief2)
 		elf_hwcap |= HWCAP_SIE;
 
+	/* ultravisor-call (secure execution) */
+	if (test_facility(158))
+		elf_hwcap |= HWCAP_UV;
+
 	return 0;
 }
 arch_initcall(setup_hwcaps);
-- 
2.35.3