Forward CPACR_EL1 traps to the virtual EL2 if virtual CPTR_EL2 is configured to trap CPACR_EL1 accesses from EL1. This is for recursive nested virtualization. Signed-off-by: Jintack Lim <jintack.lim@xxxxxxxxxx> --- 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 6f67666..ba2966d 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1091,6 +1091,11 @@ static bool access_cpacr(struct kvm_vcpu *vcpu, if (el12_reg(p) && forward_nv_traps(vcpu)) return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu)); + /* Forward this trap to the virtual EL2 if CPTR_EL2.TCPAC is set*/ + if (!el12_reg(p) && !vcpu_mode_el2(vcpu) && + (vcpu_sys_reg(vcpu, CPTR_EL2) & CPTR_EL2_TCPAC)) + return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu)); + /* * When the virtual HCR_EL2.E2H == 1, an access to CPACR_EL1 * in the virtual EL2 is to access CPTR_EL2. -- 1.9.1
