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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2017-03-03 14:21:40 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-03-11 14:47:28 +0100 |
| commit | bd2a9adaadb8defcaf6c284bca7ff41634105f51 (patch) | |
| tree | abc0e4ce725a66e7c451b149636e89d14f16c2b0 /arch/x86/hyperv | |
| parent | 434fd6353b4c83938029ca6ea7dfa4fc82d602bd (diff) | |
| download | linux-bd2a9adaadb8defcaf6c284bca7ff41634105f51.tar.gz | |
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: Vitaly 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: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 8bef70e7f3cc..bb1ea58ecd7a 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -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; |