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| author | Andrey Smetanin <asmetanin@virtuozzo.com> | 2015-11-30 19:22:21 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-12-16 18:49:45 +0100 |
| commit | 1f4b34f825e8cef6f493d06b46605384785b3d16 (patch) | |
| tree | c7b5b3cb1b5af261d6b567bbcce4c1ccfdc928fa /arch/x86/include/uapi | |
| parent | 765eaa0f70eaa274ec8b815d8c210c20cf7b6dbc (diff) | |
| download | linux-1f4b34f825e8cef6f493d06b46605384785b3d16.tar.gz linux-1f4b34f825e8cef6f493d06b46605384785b3d16.tar.bz2 linux-1f4b34f825e8cef6f493d06b46605384785b3d16.zip | |
kvm/x86: Hyper-V SynIC timers
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>
Diffstat (limited to 'arch/x86/include/uapi')
| -rw-r--r-- | arch/x86/include/uapi/asm/hyperv.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h index 2a5629eac0b1..7956412d09bd 100644 --- a/arch/x86/include/uapi/asm/hyperv.h +++ b/arch/x86/include/uapi/asm/hyperv.h @@ -355,4 +355,10 @@ struct hv_timer_message_payload { __u64 delivery_time; /* When the message was delivered */ }; +#define HV_STIMER_ENABLE (1ULL << 0) +#define HV_STIMER_PERIODIC (1ULL << 1) +#define HV_STIMER_LAZY (1ULL << 2) +#define HV_STIMER_AUTOENABLE (1ULL << 3) +#define HV_STIMER_SINT(config) (__u8)(((config) >> 16) & 0x0F) + #endif |