linux-kernel - [RFC 20/55] KVM: arm64: Forward CPACR

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Date:   Mon,  9 Jan 2017 01:24:16 -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 20/55] KVM: arm64: Forward CPACR_EL1 traps to the guest hypervisor

Forward CPACR_EL1 traps to the guest hypervisor if it has configured the
virtual CPTR_EL2 to do so.

Signed-off-by: Jintack Lim <jintack@...columbia.edu>
---
 arch/arm64/kvm/sys_regs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 321ecbc..e66f40d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -951,6 +951,11 @@ static bool access_cpacr(struct kvm_vcpu *vcpu,
 		struct sys_reg_params *p,
 		const struct sys_reg_desc *r)
 {
+	/* Forward this trap to the guest hypervisor if it expects */
+	if (!vcpu_mode_el2(vcpu) &&
+	    (vcpu_el2_reg(vcpu, CPTR_EL2) & CPTR_EL2_TCPAC))
+		return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu));
+
 	access_rw(p, &vcpu_sys_reg(vcpu, r->reg));
 	return true;
 }
-- 
1.9.1