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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Will Deacon <will@kernel.org>
Subject: [PATCH v3 2/4] arm64: KVM: Handle PMCR_EL0.LC as RES1 on pure AArch64 systems
Date: Fri, 11 Oct 2019 13:39:52 +0100	[thread overview]
Message-ID: <20191011123954.31378-3-maz@kernel.org> (raw)
In-Reply-To: <20191011123954.31378-1-maz@kernel.org>

Of PMCR_EL0.LC, the ARMv8 ARM says:

	"In an AArch64 only implementation, this field is RES 1."

So be it.

Fixes: ab9468340d2bc ("arm64: KVM: Add access handler for PMCR register")
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/sys_regs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 2071260a275b..46822afc57e0 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -632,6 +632,8 @@ static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 	 */
 	val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
 	       | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
+	if (!system_supports_32bit_el0())
+		val |= ARMV8_PMU_PMCR_LC;
 	__vcpu_sys_reg(vcpu, r->reg) = val;
 }
 
@@ -682,6 +684,8 @@ static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 		val = __vcpu_sys_reg(vcpu, PMCR_EL0);
 		val &= ~ARMV8_PMU_PMCR_MASK;
 		val |= p->regval & ARMV8_PMU_PMCR_MASK;
+		if (!system_supports_32bit_el0())
+			val |= ARMV8_PMU_PMCR_LC;
 		__vcpu_sys_reg(vcpu, PMCR_EL0) = val;
 		kvm_pmu_handle_pmcr(vcpu, val);
 		kvm_vcpu_pmu_restore_guest(vcpu);
-- 
2.20.1

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  parent reply	other threads:[~2019-10-11 12:40 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11 12:39 [PATCH v3 0/4] KVM: arm64: Assorted PMU emulation fixes Marc Zyngier
2019-10-11 12:39 ` [PATCH v3 1/4] KVM: arm64: pmu: Fix cycle counter truncation Marc Zyngier
2019-10-11 12:39 ` Marc Zyngier [this message]
2019-10-11 12:39 ` [PATCH v3 3/4] KVM: arm64: pmu: Set the CHAINED attribute before creating the in-kernel event Marc Zyngier
2019-10-11 14:19   ` Andrew Murray
2019-10-11 12:39 ` [PATCH v3 4/4] KVM: arm64: pmu: Reset sample period on overflow handling Marc Zyngier
2019-10-15 10:00   ` Andrew Murray

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