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Commit 917ea427 authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
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Drivers: hv: Setup a mapping for Hyper-V's notion cpu ID 



On win8 (ws2012), incoming vmbus interrupt load can be spread across all
available VCPUs in the guest. On a per-channel basis, the interrupts can
be bound to specific CPUs. The Linux notion of cpu ID may be different
from that of the hypervisor's. Setup a mapping structure.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3be77774

drivers/hv/hv.c

+11 −0
Original line number Diff line number Diff line
@@ -137,6 +137,8 @@ int hv_init(void) 
	memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);

	memset(hv_context.synic_message_page, 0,

	       sizeof(void *) * NR_CPUS);

	memset(hv_context.vp_index, 0,

	       sizeof(int) * NR_CPUS);



	max_leaf = query_hypervisor_info();
@@ -296,6 +298,7 @@ void hv_synic_init(void *irqarg) 
	union hv_synic_siefp siefp;

	union hv_synic_sint shared_sint;

	union hv_synic_scontrol sctrl;

	u64 vp_index;



	u32 irq_vector = *((u32 *)(irqarg));

	int cpu = smp_processor_id();
@@ -355,6 +358,14 @@ void hv_synic_init(void *irqarg) 
	wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);



	hv_context.synic_initialized = true;



	/*

	 * Setup the mapping between Hyper-V's notion

	 * of cpuid and Linux' notion of cpuid.

	 * This array will be indexed using Linux cpuid.

	 */

	rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);

	hv_context.vp_index[cpu] = (u32)vp_index;

	return;



cleanup:

drivers/hv/hyperv_vmbus.h

+10 −0
Original line number Diff line number Diff line
@@ -502,6 +502,16 @@ struct hv_context { 


	void *synic_message_page[NR_CPUS];

	void *synic_event_page[NR_CPUS];

	/*

	 * Hypervisor's notion of virtual processor ID is different from

	 * Linux' notion of CPU ID. This information can only be retrieved

	 * in the context of the calling CPU. Setup a map for easy access

	 * to this information:

	 *

	 * vp_index[a] is the Hyper-V's processor ID corresponding to

	 * Linux cpuid 'a'.

	 */

	u32 vp_index[NR_CPUS];

};



extern struct hv_context hv_context;