linux-kernel - [PATCH 3.16 034/202] s390/early: improve machine detection

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Message-ID: <lsq.1556377989.725527461@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Martin Schwidefsky" <schwidefsky@...ibm.com>,
        "Heiko Carstens" <heiko.carstens@...ibm.com>,
        "Christian Borntraeger" <borntraeger@...ibm.com>
Subject: [PATCH 3.16 034/202] s390/early: improve machine detection

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Borntraeger <borntraeger@...ibm.com>

commit 03aa047ef2db4985e444af6ee1c1dd084ad9fb4c upstream.

Right now the early machine detection code check stsi 3.2.2 for "KVM"
and set MACHINE_IS_VM if this is different. As the console detection
uses diagnose 8 if MACHINE_IS_VM returns true this will crash Linux
early for any non z/VM system that sets a different value than KVM.
So instead of assuming z/VM, do not set any of MACHINE_IS_LPAR,
MACHINE_IS_VM, or MACHINE_IS_KVM.

Reviewed-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/s390/kernel/early.c | 4 ++--
 arch/s390/kernel/setup.c | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -232,10 +232,10 @@ static noinline __init void detect_machi
 	if (stsi(vmms, 3, 2, 2) || !vmms->count)
 		return;
 
-	/* Running under KVM? If not we assume z/VM */
+	/* Detect known hypervisors */
 	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
 		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
-	else
+	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
 		S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
 }
 
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -831,6 +831,8 @@ void __init setup_arch(char **cmdline_p)
 		pr_info("Linux is running under KVM in 64-bit mode\n");
 	else if (MACHINE_IS_LPAR)
 		pr_info("Linux is running natively in 64-bit mode\n");
+	else
+		pr_info("Linux is running as a guest in 64-bit mode\n");
 #endif /* CONFIG_64BIT */
 
 	/* Have one command line that is parsed and saved in /proc/cmdline */