linux-kernel - [RFC 53/55] KVM: arm64: Reflect shadow VMPIDR_EL2 value to MPIDR

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Message-Id: <1483943091-1364-54-git-send-email-jintack@cs.columbia.edu>
Date:   Mon,  9 Jan 2017 01:24:49 -0500
From:   Jintack Lim <jintack@...columbia.edu>
To:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com,
        vladimir.murzin@....com, suzuki.poulose@....com,
        mark.rutland@....com, james.morse@....com,
        lorenzo.pieralisi@....com, kevin.brodsky@....com,
        wcohen@...hat.com, shankerd@...eaurora.org, geoff@...radead.org,
        andre.przywara@....com, eric.auger@...hat.com,
        anna-maria@...utronix.de, shihwei@...columbia.edu,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jintack@...columbia.edu
Subject: [RFC 53/55] KVM: arm64: Reflect shadow VMPIDR_EL2 value to MPIDR_EL1

A non-secure EL0 or EL1 read of MPIDR_EL1 should return the value of
VMPIDR_EL2. We emulate this by copying the virtual VMPIDR_EL2 value to
MPIDR_EL1 when entering VM's EL0 or EL1.

Signed-off-by: Jintack Lim <jintack@...columbia.edu>
---
 arch/arm64/kvm/context.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/kvm/context.c b/arch/arm64/kvm/context.c
index 9ebc38f..dd79b0e 100644
--- a/arch/arm64/kvm/context.c
+++ b/arch/arm64/kvm/context.c
@@ -173,6 +173,12 @@ void kvm_arm_setup_shadow_state(struct kvm_vcpu *vcpu)
 		ctxt->hw_pstate = *vcpu_cpsr(vcpu);
 		ctxt->hw_sys_regs = ctxt->sys_regs;
 		ctxt->hw_sp_el1 = ctxt->gp_regs.sp_el1;
+
+		/*
+		 * A non-secure EL0 or EL1 read of MPIDR_EL1 returns
+		 * the value of VMPIDR_EL2.
+		 */
+		ctxt->hw_sys_regs[MPIDR_EL1] = ctxt->el2_regs[VMPIDR_EL2];
 	}
 
 	vgic_v2_setup_shadow_state(vcpu);
-- 
1.9.1