1bb32a44ae
As we're about to change the way we map devices at HYP, we need to move away from kern_hyp_va on an IO address. One way of achieving this is to store the VAs in kvm_vgic_global_state, and use that directly from the HYP code. This requires a small change to create_hyp_io_mappings so that it can also return a HYP VA. We take this opportunity to nuke the vctrl_base field in the emulated distributor, as it is not used anymore. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* Copyright (C) 2012-2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/compiler.h>
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#include <linux/irqchip/arm-gic.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_emulate.h>
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#include <asm/kvm_hyp.h>
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#include <asm/kvm_mmu.h>
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/*
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* __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
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* guest.
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*
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* @vcpu: the offending vcpu
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*
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* Returns:
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* 1: GICV access successfully performed
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* 0: Not a GICV access
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* -1: Illegal GICV access
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*/
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int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = kern_hyp_va(vcpu->kvm);
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struct vgic_dist *vgic = &kvm->arch.vgic;
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phys_addr_t fault_ipa;
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void __iomem *addr;
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int rd;
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/* Build the full address */
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fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
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fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
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/* If not for GICV, move on */
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if (fault_ipa < vgic->vgic_cpu_base ||
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fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE))
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return 0;
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/* Reject anything but a 32bit access */
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if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32))
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return -1;
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/* Not aligned? Don't bother */
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if (fault_ipa & 3)
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return -1;
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rd = kvm_vcpu_dabt_get_rd(vcpu);
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addr = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
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addr += fault_ipa - vgic->vgic_cpu_base;
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if (kvm_vcpu_dabt_iswrite(vcpu)) {
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u32 data = vcpu_data_guest_to_host(vcpu,
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vcpu_get_reg(vcpu, rd),
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sizeof(u32));
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writel_relaxed(data, addr);
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} else {
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u32 data = readl_relaxed(addr);
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vcpu_set_reg(vcpu, rd, vcpu_data_host_to_guest(vcpu, data,
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sizeof(u32)));
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}
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return 1;
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}
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