From: Yi Sun <yi.y.sun@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, tglx@linutronix.de, jgross@suse.com,
chao.p.peng@intel.com, chao.gao@intel.com,
isaku.yamahata@intel.com, michael.h.kelley@microsoft.com,
tianyu.lan@microsoft.com, Yi Sun <yi.y.sun@linux.intel.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
Subject: [PATCH v1 1/2] x86/hyperv: get spinlock retry number on Hyper-V
Date: Fri, 19 Oct 2018 21:13:54 +0800 [thread overview]
Message-ID: <1539954835-34035-2-git-send-email-yi.y.sun@linux.intel.com> (raw)
In-Reply-To: <1539954835-34035-1-git-send-email-yi.y.sun@linux.intel.com>
EBX of Implementation Recommendations MSR (0x40000004) indicates
recommended number of attempts to retry a spinlock failure before
notifying the hypervisor about the failures.
0xFFFFFFFF indicates never to retry.
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Kelley (EOSG) <Michael.H.Kelley@microsoft.com>
Cc: Juergen Gross <jgross@suse.com>
---
arch/x86/include/asm/mshyperv.h | 3 +++
arch/x86/kernel/cpu/mshyperv.c | 1 +
2 files changed, 4 insertions(+)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 0d6271c..f909365 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -11,10 +11,13 @@
#define VP_INVAL U32_MAX
+#define HYPERV_SPINLOCK_RETRY_NEVER U32_MAX
+
struct ms_hyperv_info {
u32 features;
u32 misc_features;
u32 hints;
+ u32 num_spin_retry;
u32 nested_features;
u32 max_vp_index;
u32 max_lp_index;
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 1c72f38..04f480a 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -222,6 +222,7 @@ static void __init ms_hyperv_init_platform(void)
ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
+ ms_hyperv.num_spin_retry = cpuid_ebx(HYPERV_CPUID_ENLIGHTMENT_INFO);
pr_info("Hyper-V: features 0x%x, hints 0x%x\n",
ms_hyperv.features, ms_hyperv.hints);
--
1.9.1
next prev parent reply other threads:[~2018-10-19 13:39 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-19 13:13 [PATCH v1 0/2] Enable HvNotifyLongSpinWait for Hyper-V Yi Sun
2018-10-19 13:13 ` Yi Sun [this message]
2018-10-19 13:13 ` [PATCH v1 2/2] x86/hyperv: make HvNotifyLongSpinWait hypercall Yi Sun
2018-10-19 14:20 ` Juergen Gross
2018-10-22 1:53 ` Yi Sun
2018-10-22 7:32 ` Juergen Gross
2018-10-22 16:31 ` Waiman Long
2018-10-22 17:15 ` Peter Zijlstra
2018-10-22 17:27 ` Waiman Long
2018-10-22 17:31 ` Peter Zijlstra
2018-10-22 18:01 ` Waiman Long
2018-10-23 2:57 ` Yi Sun
2018-10-23 8:51 ` Peter Zijlstra
2018-10-23 9:33 ` Yi Sun
2018-10-31 1:54 ` Yi Sun
2018-10-31 14:10 ` Peter Zijlstra
2018-10-31 15:07 ` Waiman Long
2018-10-31 17:15 ` Peter Zijlstra
2018-11-01 3:20 ` Yi Sun
2018-11-01 8:59 ` Peter Zijlstra
2018-11-01 12:59 ` Waiman Long
2018-11-05 6:54 ` Yi Sun
2018-10-24 16:53 ` Michael Kelley
2018-10-25 2:23 ` Yi Sun
2018-10-31 2:06 ` Yi Sun
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