caab277b1d
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 <linux/swab.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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static bool __hyp_text __is_be(struct kvm_vcpu *vcpu)
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{
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if (vcpu_mode_is_32bit(vcpu))
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return !!(read_sysreg_el2(spsr) & PSR_AA32_E_BIT);
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return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
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}
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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 successfully performed
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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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__kvm_skip_instr(vcpu);
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return -1;
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}
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/* Not aligned? Don't bother */
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if (fault_ipa & 3) {
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__kvm_skip_instr(vcpu);
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return -1;
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}
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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_get_reg(vcpu, rd);
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if (__is_be(vcpu)) {
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/* guest pre-swabbed data, undo this for writel() */
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data = swab32(data);
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}
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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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if (__is_be(vcpu)) {
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/* guest expects swabbed data */
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data = swab32(data);
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}
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vcpu_set_reg(vcpu, rd, data);
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}
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__kvm_skip_instr(vcpu);
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return 1;
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}
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