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Commit dee863b5 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Greg Kroah-Hartman
Browse files

hv: export current Hyper-V clocksource 



As a preparation to implementing Hyper-V PTP device supporting
.getcrosststamp we need to export a reference to the current Hyper-V
clocksource in use (MSR or TSC page).

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9b06e101

arch/x86/hyperv/hv_init.c

+9 −4
Original line number Diff line number Diff line
@@ -99,6 +99,9 @@ static struct clocksource hyperv_cs_msr = { 
};



static void *hypercall_pg;

struct clocksource *hyperv_cs;

EXPORT_SYMBOL_GPL(hyperv_cs);



/*

 * This function is to be invoked early in the boot sequence after the

 * hypervisor has been detected.
@@ -141,10 +144,10 @@ void hyperv_init(void) 
		union hv_x64_msr_hypercall_contents tsc_msr;



		tsc_pg = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL);

		if (!tsc_pg) {

			clocksource_register_hz(&hyperv_cs_msr, NSEC_PER_SEC/100);

			return;

		}

		if (!tsc_pg)

			goto register_msr_cs;



		hyperv_cs = &hyperv_cs_tsc;



		rdmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
@@ -161,6 +164,8 @@ void hyperv_init(void) 
	 * the partition counter.

	 */



register_msr_cs:

	hyperv_cs = &hyperv_cs_msr;

	if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)

		clocksource_register_hz(&hyperv_cs_msr, NSEC_PER_SEC/100);

}

arch/x86/include/asm/mshyperv.h

+3 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


#include <linux/types.h>

#include <linux/interrupt.h>

#include <linux/clocksource.h>

#include <asm/hyperv.h>



/*
@@ -168,6 +169,8 @@ void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); 
void hv_remove_crash_handler(void);



#if IS_ENABLED(CONFIG_HYPERV)

extern struct clocksource *hyperv_cs;



void hyperv_init(void);

void hyperv_report_panic(struct pt_regs *regs);

bool hv_is_hypercall_page_setup(void);