linux-kernel - [RFC PATCH v3 0/5] x86/kvm: Virtual suspend time injection support

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Date:   Wed, 20 Oct 2021 21:04:25 +0900
From:   Hikaru Nishida <hikalium@...omium.org>
To:     linux-kernel@...r.kernel.org, dme@....org, tglx@...utronix.de,
        mlevitsk@...hat.com, linux@...ck-us.net, pbonzini@...hat.com,
        vkuznets@...hat.com, maz@...nel.org, will@...nel.org
Cc:     suleiman@...gle.com, senozhatsky@...gle.com,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        Hikaru Nishida <hikalium@...omium.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        John Stultz <john.stultz@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Wanpeng Li <wanpengli@...cent.com>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, x86@...nel.org
Subject: [RFC PATCH v3 0/5] x86/kvm: Virtual suspend time injection support


Hi,

This patch series adds virtual suspend time injection support to KVM.
It is an updated version of the following series:
v2:
https://lore.kernel.org/kvm/20210806100710.2425336-1-hikalium@chromium.org/
v1:
https://lore.kernel.org/kvm/20210426090644.2218834-1-hikalium@chromium.org/

Please take a look again.

To kvm/arm64 folks:
I'm going to implement this mechanism to ARM64 as well but not
sure which function should be used to make an IRQ (like kvm_apic_set_irq
in x86) and if it is okay to use kvm_gfn_to_hva_cache /
kvm_write_guest_cached for sharing the suspend duration.
Please let me know if there is other suitable way or any suggestions.

Thanks,

Hikaru Nishida


Changes in v3:
- Used PM notifier instead of modifying timekeeping_resume()
  - This avoids holding kvm_lock under interrupt disabled context.
- Used KVM_REQ_* to make a request for vcpus.
- Reused HYPERVISOR_CALLBACK_VECTOR IRQ instead of adding a new one.
- Extracted arch-independent parts.
- Fixed other reviewed points.

Hikaru Nishida (5):
  timekeeping: Expose tk->offs_boot via ktime_get_offs_boot_ns
  kvm/x86: Include asm/pvclock.h in asm/kvmclock.h
  kvm/x86: virtual suspend time injection: Add common definitions
  kvm/x86: virtual suspend time injection: Implement host side
  kvm/x86: virtual suspend time injection: Implement guest side

 Documentation/virt/kvm/cpuid.rst     |   3 +
 Documentation/virt/kvm/msr.rst       |  30 ++++++++
 arch/x86/Kconfig                     |  13 ++++
 arch/x86/include/asm/idtentry.h      |   2 +-
 arch/x86/include/asm/kvm_host.h      |   2 +
 arch/x86/include/asm/kvmclock.h      |  11 +++
 arch/x86/include/uapi/asm/kvm_para.h |   6 ++
 arch/x86/kernel/kvm.c                |  14 +++-
 arch/x86/kernel/kvmclock.c           |  26 +++++++
 arch/x86/kvm/Kconfig                 |  13 ++++
 arch/x86/kvm/cpuid.c                 |   4 +
 arch/x86/kvm/x86.c                   | 109 +++++++++++++++++++++++++++
 arch/x86/mm/fault.c                  |   2 +-
 include/linux/kvm_host.h             |  48 ++++++++++++
 include/linux/timekeeper_internal.h  |   5 ++
 include/linux/timekeeping.h          |   6 ++
 kernel/time/timekeeping.c            |  56 ++++++++++++++
 virt/kvm/kvm_main.c                  |  88 +++++++++++++++++++++
 18 files changed, 432 insertions(+), 6 deletions(-)

-- 
2.33.0.1079.g6e70778dc9-goog