linux-kernel - [PATCH v2 07/12] x86/jailhouse: Set up timekeeping

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Date:   Mon, 27 Nov 2017 09:11:49 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com
Subject: [PATCH v2 07/12] x86/jailhouse: Set up timekeeping

From: Jan Kiszka <jan.kiszka@...mens.com>

Get the precalibrated frequencies for the TSC and the APIC timer from
the Jailhouse platform info and set the kernel values accordingly.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 arch/x86/kernel/jailhouse.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 267547162a2c..effec7d2b480 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -18,6 +18,7 @@
 #include <asm/setup.h>
 
 static __initdata struct jailhouse_setup_data setup_data;
+static unsigned int precalibrated_tsc_khz;
 
 static uint32_t jailhouse_cpuid_base(void)
 {
@@ -33,6 +34,16 @@ static uint32_t __init jailhouse_detect(void)
 	return jailhouse_cpuid_base();
 }
 
+static void __init jailhouse_timer_init(void)
+{
+	lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
+}
+
+static unsigned long jailhouse_get_tsc(void)
+{
+	return precalibrated_tsc_khz;
+}
+
 static void __init jailhouse_get_smp_config(unsigned int early)
 {
 	unsigned int cpu;
@@ -68,8 +79,12 @@ static void __init jailhouse_init_platform(void)
 	struct setup_data header;
 	void *mapping;
 
+	x86_init.timers.timer_init	= jailhouse_timer_init;
 	x86_init.mpparse.get_smp_config	= jailhouse_get_smp_config;
 
+	x86_platform.calibrate_cpu	= jailhouse_get_tsc;
+	x86_platform.calibrate_tsc	= jailhouse_get_tsc;
+
 	while (pa_data) {
 		mapping = early_memremap(pa_data, sizeof(header));
 		memcpy(&header, mapping, sizeof(header));
@@ -97,6 +112,8 @@ static void __init jailhouse_init_platform(void)
 
 	pmtmr_ioport = setup_data.pm_timer_address;
 	pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
+
+	precalibrated_tsc_khz = setup_data.tsc_khz;
 }
 
 bool jailhouse_paravirt(void)
-- 
2.12.3