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| author | K. Y. Srinivasan <kys@microsoft.com> | 2012-12-01 06:46:47 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 11:34:37 -0800 |
| commit | 917ea427c78670958488f7f304e4629c325969a4 (patch) | |
| tree | 06784d2cd61f6505b2222d2fdfbfeec2b3fb066a | |
| parent | 3be77774017fc3c7dd0b434265dfa417aac23545 (diff) | |
| download | linux-917ea427c78670958488f7f304e4629c325969a4.tar.gz linux-917ea427c78670958488f7f304e4629c325969a4.tar.bz2 linux-917ea427c78670958488f7f304e4629c325969a4.zip | |
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: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hv/hv.c | 11 | ||||
| -rw-r--r-- | drivers/hv/hyperv_vmbus.h | 10 |
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index dd0af8940657..76304a622140 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -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: diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 1bc7500fb84c..6bbc197cbdfa 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -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; |