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From: maz@kernel.org
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
kvm@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>,
Andrew Murray <andrew.murray@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH 0/3] KVM: arm64: Assorted PMU emulation fixes
Date: Sun, 6 Oct 2019 11:46:33 +0100
Message-Id: <20191006104636.11194-1-maz@kernel.org>
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KVM: arm64: Assorted PMU emulation fixes
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From: Marc Zyngier <maz@kernel.org> I recently came across a number of PMU emulation bugs, all which can result in unexpected behaviours in an unsuspecting guest. The first two patches already have been discussed on the list, but I'm including them here as part of a slightly longer series. The last patch fixes an issue that has been here from day one, where we confuse architectural overflow of a counter and perf sampling period. If nobody disagrees, I'll send them upstream shortly. Marc Zyngier (3): KVM: arm64: pmu: Fix cycle counter truncation arm64: KVM: Handle PMCR_EL0.LC as RES1 on pure AArch64 systems KVM: arm64: pmu: Reset sample period on overflow handling arch/arm64/kvm/sys_regs.c | 4 ++++ virt/kvm/arm/pmu.c | 34 ++++++++++++++++++++++++---------- 2 files changed, 28 insertions(+), 10 deletions(-)