linux-kernel - [PATCH v3 0/4] hyper-v: Introduce TSC page for root partition

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Message-ID: <166749827889.218190.12775118554387271641.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
Date:   Thu, 03 Nov 2022 17:58:43 +0000
From:   Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Stanislav Kinsburskiy <stanislav.kinsburskiy@...il.com>,
        x86@...nel.org, mikelley@...rosoft.com
Subject: [PATCH v3 0/4] hyper-v: Introduce TSC page for root partition

This series does some cleanup and precursor changes to the hyper-v clock
source and introduces support for TSC page based clock in root partition.

Hyper-V root partition requires kernel to map the page, specified by the
hypervisor (instead of provide the PFN to the hypervisor like it's done in
guest partition).

v3:
1. Rebased on top of the fix to support arbitrary TSC page size by Anirudh
2. Fixed TSC physical page when remapping in root partition.

v2:
1. Addressed all the comments to the commit messages.
2. TSC page in root partition is now remapped based on size of the tsc_pg
variable.

The following series implements...

---

Stanislav Kinsburskiy (4):
      drivers/clocksource/hyper-v: Introduce a pointer to TSC page
      drivers/clocksource/hyper-v: Introduce TSC PFN getter
      drivers/clocksource/hyper-v: Use TSC PFN getter to map vvar page
      drivers/clocksource/hyper-v: Add TSC page support for root partition


 arch/x86/entry/vdso/vma.c          |    7 ++---
 arch/x86/hyperv/hv_init.c          |    2 +
 drivers/clocksource/hyperv_timer.c |   55 +++++++++++++++++++++++++++---------
 include/clocksource/hyperv_timer.h |    7 +++++
 4 files changed, 53 insertions(+), 18 deletions(-)