linux-kernel - [PATCH 16/18] Drivers: hv: vmbus: Define an API to retrieve virtual processor index

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Date:   Fri, 30 Dec 2016 13:36:10 -0800
From:   kys@...hange.microsoft.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com, rkagan@...tuozzo.com,
        x86@...nel.org, tglx@...utronix.de, hpa@...or.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 16/18] Drivers: hv: vmbus: Define an API to retrieve virtual processor index

From: K. Y. Srinivasan <kys@...rosoft.com>

As part of cleaning up architecture specific code, define an API
to retrieve the virtual procesor index.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 arch/x86/include/asm/mshyperv.h |    2 ++
 drivers/hv/hv.c                 |    2 +-
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 1ea19a5..2d40bfc 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -149,6 +149,8 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 #define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
 #define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
 
+#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
+
 void hyperv_callback_vector(void);
 #ifdef CONFIG_TRACING
 #define trace_hyperv_callback_vector hyperv_callback_vector
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 3c9a819..9b2630b 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -306,7 +306,7 @@ int hv_synic_init(unsigned int cpu)
 	 * of cpuid and Linux' notion of cpuid.
 	 * This array will be indexed using Linux cpuid.
 	 */
-	rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
+	hv_get_vp_index(vp_index);
 	hv_context.vp_index[cpu] = (u32)vp_index;
 
 	/*
-- 
1.7.4.1