kvm/x86: Hyper-V SynIC timers

mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00

Per Hyper-V specification (and as required by Hyper-V-aware guests),
SynIC provides 4 per-vCPU timers.  Each timer is programmed via a pair
of MSRs, and signals expiration by delivering a special format message
to the configured SynIC message slot and triggering the corresponding
synthetic interrupt.

Note: as implemented by this patch, all periodic timers are "lazy"
(i.e. if the vCPU wasn't scheduled for more than the timer period the
timer events are lost), regardless of the corresponding configuration
MSR.  If deemed necessary, the "catch up" mode (the timer period is
shortened until the timer catches up) will be implemented later.

Changes v2:
* Use remainder to calculate periodic timer expiration time

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: "K. Y. Srinivasan" <kys@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Vitaly Kuznetsov <vkuznets@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

This commit is contained in:

Andrey Smetanin

2015-11-30 19:22:21 +03:00

committed by

Paolo Bonzini

parent 765eaa0f70

commit 1f4b34f825

6 changed files with 368 additions and 3 deletions

									
										include/linux/kvm_host.h
									
		+1
		
												View File
												
				@@ -144,6 +144,7 @@ static inline bool is_error_page(struct page *page)

				#define KVM_REQ_IOAPIC_EOI_EXIT   28

				#define KVM_REQ_HV_RESET          29

				#define KVM_REQ_HV_EXIT           30

				#define KVM_REQ_HV_STIMER         31

				#define KVM_USERSPACE_IRQ_SOURCE_ID		0

				#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID	1