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From:   lantianyu1986@gmail.com
To:     luto@kernel.org, tglx@linutronix.de, mingo@redhat.com,
        bp@alien8.de, hpa@zytor.com, x86@kernel.org, kys@microsoft.com,
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Cc:     Tianyu Lan <Tianyu.Lan@microsoft.com>, linux-arch@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH V2 0/2] clocksource/Hyper-V: Add Hyper-V specific sched clock
Date:   Wed, 14 Aug 2019 20:32:14 +0800
Message-Id: <20190814123216.32245-1-Tianyu.Lan@microsoft.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

Hyper-V guests use the default native_sched_clock() in pv_ops.time.sched_clock
on x86. But native_sched_clock() directly uses the raw TSC value, which
can be discontinuous in a Hyper-V VM.   Add the generic hv_setup_sched_clock()
to set the sched clock function appropriately.  On x86, this sets
pv_ops.time.sched_clock to read the Hyper-V reference TSC value that is
scaled and adjusted to be continuous.

Also move the Hyper-V reference TSC initialization much earlier in the boot
process so no discontinuity is observed when pv_ops.time.sched_clock
calculates its offset.  This earlier initialization requires that the Hyper-V TSC
page be allocated statically instead of with vmalloc(), so fixup the references
to the TSC page and the method of getting its physical address.

Change since v1:
	- Update patch 1 commit log
	- Remove and operation of tsc page's va with PAGE_MASK
	in the read_hv_sched_clock_tsc().

Tianyu Lan (2):
  clocksource/Hyper-v: Allocate Hyper-V tsc page statically
  clocksource/Hyper-V:  Add Hyper-V specific sched clock function

 arch/x86/entry/vdso/vma.c          |  2 +-
 arch/x86/hyperv/hv_init.c          |  2 --
 arch/x86/kernel/cpu/mshyperv.c     |  8 ++++++++
 drivers/clocksource/hyperv_timer.c | 34 ++++++++++++++++------------------
 include/asm-generic/mshyperv.h     |  1 +
 5 files changed, 26 insertions(+), 21 deletions(-)

-- 
2.14.5