linux-kernel - [PATCH] x86/jailhouse: Set X86_FEATURE_TSC_KNOWN

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Message-ID: <975fbfc9-2a64-cc56-40d5-164992ec3916@siemens.com>
Date:   Fri, 19 Jan 2018 11:06:17 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     x86 <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>
Cc:     Jailhouse <jailhouse-dev@...glegroups.com>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/jailhouse: Set X86_FEATURE_TSC_KNOWN_FREQ

Otherwise, Linux will not recognize precalibrated_tsc_khz and disable
the tsc as clocksource.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 arch/x86/kernel/jailhouse.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 7ade152133c7..2b7ebbe9043d 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -176,6 +176,7 @@ static void __init jailhouse_init_platform(void)
 	pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
 
 	precalibrated_tsc_khz = setup_data.tsc_khz;
+	setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
 
 	pci_probe = 0;