linux-kernel - [PATCH char-misc 1/1] Hyper-V: Remove x86-isms from architecture independent Hyper-V drivers

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Message-Id: <20171025223125.28066-1-mikelley@exchange.microsoft.com>
Date:   Wed, 25 Oct 2017 15:31:25 -0700
From:   mikelley@...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, marcelo.cerri@...onical.com,
        sthemmin@...rosoft.com, kys@...rosoft.com
Cc:     Michael Kelley <mikelley@...rosoft.com>
Subject: [PATCH char-misc 1/1] Hyper-V: Remove x86-isms from architecture independent Hyper-V drivers

From: Michael Kelley <mikelley@...rosoft.com>

hv_is_hypercall_page_setup() is used to check if Hyper-V is
initialized, but a 'hypercall page' is an x86 implementation detail
that isn't necessarily present on other architectures.  Rename to the
architecture independent hv_is_hyperv_initialized(). Use this function
instead of direct references to x86-specific data structures in
vmbus_drv.c, and remove 'x86' from the string name passed to
cpuhp_setup_state().

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/hyperv/hv_init.c       | 4 ++--
 arch/x86/include/asm/mshyperv.h | 4 ++--
 drivers/hv/hv.c                 | 2 +-
 drivers/hv/vmbus_drv.c          | 5 ++---
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index a5db63f728a2..38310bd091c2 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -236,7 +236,7 @@ void hyperv_report_panic(struct pt_regs *regs)
 }
 EXPORT_SYMBOL_GPL(hyperv_report_panic);
 
-bool hv_is_hypercall_page_setup(void)
+bool hv_is_hyperv_initialized(void)
 {
 	union hv_x64_msr_hypercall_contents hypercall_msr;
 
@@ -249,4 +249,4 @@ bool hv_is_hypercall_page_setup(void)
 
 	return true;
 }
-EXPORT_SYMBOL_GPL(hv_is_hypercall_page_setup);
+EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 530f448fddaf..b001f898ccf3 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -311,11 +311,11 @@ void hyperv_init(void);
 void hyperv_setup_mmu_ops(void);
 void hyper_alloc_mmu(void);
 void hyperv_report_panic(struct pt_regs *regs);
-bool hv_is_hypercall_page_setup(void);
+bool hv_is_hyperv_initialized(void);
 void hyperv_cleanup(void);
 #else /* CONFIG_HYPERV */
 static inline void hyperv_init(void) {}
-static inline bool hv_is_hypercall_page_setup(void) { return false; }
+static inline bool hv_is_hyperv_initialized(void) { return false; }
 static inline void hyperv_cleanup(void) {}
 static inline void hyperv_setup_mmu_ops(void) {}
 #endif /* CONFIG_HYPERV */
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 8267439dd1ee..ebad26053362 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -49,7 +49,7 @@ struct hv_context hv_context = {
  */
 int hv_init(void)
 {
-	if (!hv_is_hypercall_page_setup())
+	if (!hv_is_hyperv_initialized())
 		return -ENOTSUPP;
 
 	hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 1da8e818f4de..12c51dc6bb7b 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -37,7 +37,6 @@
 #include <linux/sched/task_stack.h>
 
 #include <asm/hyperv.h>
-#include <asm/hypervisor.h>
 #include <asm/mshyperv.h>
 #include <linux/notifier.h>
 #include <linux/ptrace.h>
@@ -1047,7 +1046,7 @@ static int vmbus_bus_init(void)
 	 * Initialize the per-cpu interrupt state and
 	 * connect to the host.
 	 */
-	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online",
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hyperv/vmbus:online",
 				hv_synic_init, hv_synic_cleanup);
 	if (ret < 0)
 		goto err_alloc;
@@ -1695,7 +1694,7 @@ static int __init hv_acpi_init(void)
 {
 	int ret, t;
 
-	if (x86_hyper != &x86_hyper_ms_hyperv)
+	if (!hv_is_hyperv_initialized())
 		return -ENODEV;
 
 	init_completion(&probe_event);
-- 
2.14.1