From mboxrd@z Thu Jan 1 00:00:00 1970 From: jintack@cs.columbia.edu (Jintack Lim) Date: Mon, 9 Jan 2017 01:24:16 -0500 Subject: [RFC 20/55] KVM: arm64: Forward CPACR_EL1 traps to the guest hypervisor In-Reply-To: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> References: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> Message-ID: <1483943091-1364-21-git-send-email-jintack@cs.columbia.edu> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Forward CPACR_EL1 traps to the guest hypervisor if it has configured the virtual CPTR_EL2 to do so. Signed-off-by: Jintack Lim --- 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