linux-kernel - [tip:x86/urgent] x86/vmware: Skip timer_irq

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Date:   Wed, 19 Oct 2016 08:42:42 -0700
From:   tip-bot for Renat Valiullin <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
        tglx@...utronix.de, akataria@...are.com, rvaliullin@...are.com
Subject: [tip:x86/urgent] x86/vmware: Skip timer_irq_works() check on VMware

Commit-ID:  854dd54245f7f1b1175b1bada613929396a571be
Gitweb:     http://git.kernel.org/tip/854dd54245f7f1b1175b1bada613929396a571be
Author:     Renat Valiullin <rvaliullin@...are.com>
AuthorDate: Thu, 13 Oct 2016 11:45:39 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 19 Oct 2016 17:36:33 +0200

x86/vmware: Skip timer_irq_works() check on VMware

The timer_irq_works() boot check may sometimes fail in a VM, when
the Host is overcommitted or when the Guest is running nested.

Since the intended check is unnecessary on VMware's virtual
hardware, by-pass it.

Signed-off-by: Renat Valiullin <rvaliullin@...are.com>
Acked-by: Alok N Kataria <akataria@...are.com>
Cc: virtualization@...ts.linux-foundation.org
Link: http://lkml.kernel.org/r/20161013184539.GA11497@rvaliullin-vm
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/cpu/vmware.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 8116057..5130985 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -27,6 +27,7 @@
 #include <asm/div64.h>
 #include <asm/x86_init.h>
 #include <asm/hypervisor.h>
+#include <asm/timer.h>
 #include <asm/apic.h>
 
 #define CPUID_VMWARE_INFO_LEAF	0x40000000
@@ -94,6 +95,10 @@ static void __init vmware_platform_setup(void)
 	} else {
 		pr_warn("Failed to get TSC freq from the hypervisor\n");
 	}
+
+#ifdef CONFIG_X86_IO_APIC
+	no_timer_check = 1;
+#endif
 }
 
 /*