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From: James Morse <james.morse@arm.com>
To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org
Cc: Marc Zyngier <maz@kernel.org>
Subject: [PATCH v2 2/3] KVM: arm64: Add emulation for 32bit guests accessing ACTLR2
Date: Fri, 29 May 2020 15:06:55 +0000	[thread overview]
Message-ID: <20200529150656.7339-3-james.morse@arm.com> (raw)
In-Reply-To: <20200529150656.7339-1-james.morse@arm.com>

ACTLR_EL1 is a 64bit register while the 32bit ACTLR is obviously 32bit.
For 32bit software, the extra bits are accessible via ACTLR2... which
KVM doesn't emulate.

Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: James Morse <james.morse@arm.com>
---
 arch/arm64/kvm/sys_regs_generic_v8.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c
index 9cb6b4c8355a..aa9d356451eb 100644
--- a/arch/arm64/kvm/sys_regs_generic_v8.c
+++ b/arch/arm64/kvm/sys_regs_generic_v8.c
@@ -27,6 +27,14 @@ static bool access_actlr(struct kvm_vcpu *vcpu,
 		return ignore_write(vcpu, p);
 
 	p->regval = vcpu_read_sys_reg(vcpu, ACTLR_EL1);
+
+	if (p->is_aarch32) {
+		if (r->Op2 & 2)
+			p->regval = upper_32_bits(p->regval);
+		else
+			p->regval = lower_32_bits(p->regval);
+	}
+
 	return true;
 }
 
@@ -47,6 +55,8 @@ static const struct sys_reg_desc genericv8_cp15_regs[] = {
 	/* ACTLR */
 	{ Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
 	  access_actlr },
+	{ Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b011),
+	  access_actlr },
 };
 
 static struct kvm_sys_reg_target_table genericv8_target_table = {
-- 
2.20.1

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  parent reply	other threads:[~2020-05-29 15:07 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29 15:06 [PATCH v2 0/3] KVM: arm64: aarch32 ACTLR accesses James Morse
2020-05-29 15:06 ` [PATCH v2 1/3] KVM: arm64: Stop writing aarch32's CSSELR into ACTLR James Morse
2020-05-29 15:06 ` James Morse [this message]
2020-05-29 15:06 ` [PATCH v2 3/3] KVM: arm64: Stop save/restoring ACTLR_EL1 James Morse
2020-06-10 13:17 ` [PATCH v2 0/3] KVM: arm64: aarch32 ACTLR accesses Marc Zyngier

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