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x86, hyperv: Handle Xen emulation of Hyper-V more gracefully 

Install the Hyper-V specific interrupt handler only when needed. This would
permit us to get rid of the Xen check. Note that when the vmbus drivers invokes
the call to register its handler, we are sure to be running on Hyper-V.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Link: http://lkml.kernel.org/r/1366299886-6399-1-git-send-email-kys@microsoft.com
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
K. Y. Srinivasan 2013-04-18 08:44:46 -07:00 committed by H. Peter Anvin
parent 26564600c9
commit 7eff7ded02
1 changed files with 5 additions and 13 deletions
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18
arch/x86/kernel/cpu/mshyperv.c
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@ -35,13 +35,6 @@ static bool __init ms_hyperv_platform(void)
if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
return false;
/*
* Xen emulates Hyper-V to support enlightened Windows.
* Check to see first if we are on a Xen Hypervisor.
*/
if (xen_cpuid_base())
return false;
cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
&eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
@ -82,12 +75,6 @@ static void __init ms_hyperv_init_platform(void)
if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)
clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
#if IS_ENABLED(CONFIG_HYPERV)
/*
* Setup the IDT for hypervisor callback.
*/
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
#endif
}
const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
@ -103,6 +90,11 @@ static irq_handler_t vmbus_isr;
void hv_register_vmbus_handler(int irq, irq_handler_t handler)
{
/*
* Setup the IDT for hypervisor callback.
*/
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
vmbus_irq = irq;
vmbus_isr = handler;
}