Commit f726c462 authored Sep 27, 2018 by Yi Sun Committed by Thomas Gleixner Oct 09, 2018

x86/hyperv: Add GUEST_IDLE_MSR support



Hyper-V may expose a HV_X64_MSR_GUEST_IDLE MSR via HYPERV_CPUID_FEATURES.

Reading this MSR triggers the host to transition the guest vCPU into an
idle state. This state can be exited via an IPI even if the read in the
guest happened from an interrupt disabled section.

Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: chao.p.peng@intel.com
Cc: chao.gao@intel.com
Cc: isaku.yamahata@intel.com
Cc: tianyu.lan@microsoft.com
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Link: https://lkml.kernel.org/r/1538028104-114050-2-git-send-email-yi.y.sun@linux.intel.com

parent 3637897b

arch/x86/include/asm/hyperv-tlfs.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -38,6 +38,8 @@
		#define HV_MSR_TIME_REF_COUNT_AVAILABLE (1 << 1)
		/* Partition reference TSC MSR is available */
		#define HV_MSR_REFERENCE_TSC_AVAILABLE (1 << 9)
		/* Partition Guest IDLE MSR is available */
		#define HV_X64_MSR_GUEST_IDLE_AVAILABLE (1 << 10)

		/* A partition's reference time stamp counter (TSC) page */
		#define HV_X64_MSR_REFERENCE_TSC 0x40000021
		@@ -246,6 +248,9 @@
		#define HV_X64_MSR_STIMER3_CONFIG 0x400000B6
		#define HV_X64_MSR_STIMER3_COUNT 0x400000B7

		/* Hyper-V guest idle MSR */
		#define HV_X64_MSR_GUEST_IDLE 0x400000F0

		/* Hyper-V guest crash notification MSR's */
		#define HV_X64_MSR_CRASH_P0 0x40000100
		#define HV_X64_MSR_CRASH_P1 0x40000101

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