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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
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@@ -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);