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authorMichael Kelley <mhkelley@outlook.com>2018-03-04 22:17:18 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-06 09:57:17 -0800
commit248e742a396e7f00b283f1c56e14b1bef6e3ec56 (patch)
tree7c4976f72e563b771ac6b53094cab1e91fe3849c /drivers/hv/hyperv_vmbus.h
parentce767047b1b731a1899a528338644f2bfdab8b36 (diff)
downloadlinux-248e742a396e7f00b283f1c56e14b1bef6e3ec56.tar.bz2
Drivers: hv: vmbus: Implement Direct Mode for stimer0
The 2016 version of Hyper-V offers the option to operate the guest VM per-vcpu stimer's in Direct Mode, which means the timer interupts on its own vector rather than queueing a VMbus message. Direct Mode reduces timer processing overhead in both the hypervisor and the guest, and avoids having timer interrupts pollute the VMbus interrupt stream for the synthetic NIC and storage. This patch enables Direct Mode by default on stimer0 when running on a version of Hyper-V that supports it. In prep for coming support of Hyper-V on ARM64, the arch independent portion of the code contains calls to routines that will be populated on ARM64 but are not needed and do nothing on x86. 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>
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
-rw-r--r--drivers/hv/hyperv_vmbus.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 22300ec7b556..36d34fe3ccb3 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -57,7 +57,9 @@ union hv_timer_config {
u64 periodic:1;
u64 lazy:1;
u64 auto_enable:1;
- u64 reserved_z0:12;
+ u64 apic_vector:8;
+ u64 direct_mode:1;
+ u64 reserved_z0:3;
u64 sintx:4;
u64 reserved_z1:44;
};