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Drivers: hv: vmbus: Remove x86-isms from arch independent drivers

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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() and add check
that x86_hyper is pointing to Hyper-V.  Use this function instead of
direct references to x86-specific data structures in vmbus_drv.c,
and remove now redundant call in hv_init(). Also remove 'x86' from
the string name passed to cpuhp_setup_state().

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Kelley 2017-12-22 11:19:02 -07:00 committed by Greg Kroah-Hartman
parent f5cb779ba1
commit 4a5f3cde4d
4 changed files with 18 additions and 15 deletions
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21
arch/x86/hyperv/hv_init.c
View File

@ -239,17 +239,24 @@ void hyperv_report_panic(struct pt_regs *regs, long err)
}
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;
/* Check if the hypercall page is setup */
/*
* Ensure that we're really on Hyper-V, and not a KVM or Xen
* emulation of Hyper-V
*/
if (x86_hyper_type != X86_HYPER_MS_HYPERV)
return false;
/*
* Verify that earlier initialization succeeded by checking
* that the hypercall page is setup
*/
hypercall_msr.as_uint64 = 0;
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
if (!hypercall_msr.enable)
return false;
return true;
return hypercall_msr.enable;
}
EXPORT_SYMBOL_GPL(hv_is_hypercall_page_setup);
EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);

4
arch/x86/include/asm/mshyperv.h
View File

@ -312,11 +312,11 @@ void hyperv_init(void);
void hyperv_setup_mmu_ops(void);
void hyper_alloc_mmu(void);
void hyperv_report_panic(struct pt_regs *regs, long err);
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 */

3
drivers/hv/hv.c
View File

@ -49,9 +49,6 @@ struct hv_context hv_context = {
*/
int hv_init(void)
{
if (!hv_is_hypercall_page_setup())
return -ENOTSUPP;
hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
if (!hv_context.cpu_context)
return -ENOMEM;

5
drivers/hv/vmbus_drv.c
View File

@ -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>
@ -1053,7 +1052,7 @@ 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;
@ -1717,7 +1716,7 @@ static int __init hv_acpi_init(void)
{
int ret, t;
if (x86_hyper_type != X86_HYPER_MS_HYPERV)
if (!hv_is_hyperv_initialized())
return -ENODEV;
init_completion(&probe_event);