linux-kernel - [PATCH] x86/vmware: Skip timer_irq

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Message-ID: <20161013184539.GA11497@rvaliullin-vm>
Date:   Thu, 13 Oct 2016 11:45:39 -0700
From:   Renat Valiullin <rvaliullin@...are.com>
To:     Alok Kataria <akataria@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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, this change by-passes it.

Signed-off-by: Renat Valiullin <rvaliullin@...are.com>
Acked-by: Alok N Kataria <akataria@...are.com>
---
 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
 }
 
 /*
-- 
2.7.4