linux-kernel - [PATCH v3 0/3] KVM: arm64: Use generic guest entry infrastructure

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Date:   Mon,  2 Aug 2021 19:28:06 +0000
From:   Oliver Upton <oupton@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Peter Shier <pshier@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Guangyu Shi <guangyus@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Subject: [PATCH v3 0/3] KVM: arm64: Use generic guest entry infrastructure

The arm64 kernel doesn't yet support the full generic entry
infrastructure. That being said, KVM/arm64 doesn't properly handle
TIF_NOTIFY_RESUME and could pick this up by switching to the generic
guest entry infrasturture.

Patch 1 adds a missing vCPU stat to ARM64 to record the number of signal
exits to userspace.

Patch 2 unhitches entry-kvm from entry-generic, as ARM64 doesn't
currently support the generic infrastructure.

Patch 3 replaces the open-coded entry handling with the generic xfer
function.

This series was tested on an Ampere Mt. Jade reference system. The
series cleanly applies to kvm/queue (note that this is deliberate as the
generic kvm stats patches have not yet propagated to kvm-arm/queue) at
the following commit:

8ad5e63649ff ("KVM: Don't take mmu_lock for range invalidation unless necessary")

v1 -> v2:
 - Address Jing's comment
 - Carry Jing's r-b tag

v2 -> v3:
 - Roll all exit conditions into kvm_vcpu_exit_request() (Marc)
 - Avoid needlessly checking for work twice (Marc)

v1: http://lore.kernel.org/r/20210729195632.489978-1-oupton@google.com
v2: http://lore.kernel.org/r/20210729220916.1672875-1-oupton@google.com

Oliver Upton (3):
  KVM: arm64: Record number of signal exits as a vCPU stat
  entry: KVM: Allow use of generic KVM entry w/o full generic support
  KVM: arm64: Use generic KVM xfer to guest work function

 arch/arm64/include/asm/kvm_host.h |  1 +
 arch/arm64/kvm/Kconfig            |  1 +
 arch/arm64/kvm/arm.c              | 71 +++++++++++++++++++------------
 arch/arm64/kvm/guest.c            |  1 +
 include/linux/entry-kvm.h         |  6 ++-
 5 files changed, 52 insertions(+), 28 deletions(-)

-- 
2.32.0.554.ge1b32706d8-goog