Commit bd2a9ada authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Thomas Gleixner
Browse files

x86/hyperv: Implement hv_get_tsc_page() 



To use Hyper-V TSC page clocksource from vDSO we need to make tsc_pg
available. Implement hv_get_tsc_page() and add CONFIG_HYPERV_TSCPAGE to
make #ifdef-s simple.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: devel@linuxdriverproject.org
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: virtualization@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/20170303132142.25595-2-vkuznets@redhat.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 434fd635

arch/x86/hyperv/hv_init.c

+7 −2
Original line number Diff line number Diff line
@@ -27,10 +27,15 @@ 
#include <linux/clockchips.h>





#ifdef CONFIG_X86_64

#ifdef CONFIG_HYPERV_TSCPAGE



static struct ms_hyperv_tsc_page *tsc_pg;



struct ms_hyperv_tsc_page *hv_get_tsc_page(void)

{

	return tsc_pg;

}



static u64 read_hv_clock_tsc(struct clocksource *arg)

{

	u64 current_tick;
@@ -139,7 +144,7 @@ void hyperv_init(void) 
	/*

	 * Register Hyper-V specific clocksource.

	 */

#ifdef CONFIG_X86_64

#ifdef CONFIG_HYPERV_TSCPAGE

	if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {

		union hv_x64_msr_hypercall_contents tsc_msr;

arch/x86/include/asm/mshyperv.h

+8 −0
Original line number Diff line number Diff line
@@ -176,4 +176,12 @@ void hyperv_report_panic(struct pt_regs *regs); 
bool hv_is_hypercall_page_setup(void);

void hyperv_cleanup(void);

#endif

#ifdef CONFIG_HYPERV_TSCPAGE

struct ms_hyperv_tsc_page *hv_get_tsc_page(void);

#else

static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)

{

	return NULL;

}

#endif

#endif

drivers/hv/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -7,6 +7,9 @@ config HYPERV 
	  Select this option to run Linux as a Hyper-V client operating

	  system.



config HYPERV_TSCPAGE

       def_bool HYPERV && X86_64



config HYPERV_UTILS

	tristate "Microsoft Hyper-V Utilities driver"

	depends on HYPERV && CONNECTOR && NLS

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