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Subject[PATCH char-misc 1/1] Hyper-V: Remove x86-isms from architecture independent Hyper-V drivers
Date
From: Michael Kelley <mikelley@microsoft.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@microsoft.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
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