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247bc166e6
Hyp code used the hyp_symbol_addr helper to force PC-relative addressing because absolute addressing results in kernel VAs due to the way hyp code is linked. This is not true anymore, so remove the helper and update all of its users. Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210105180541.65031-9-dbrazdil@google.com
90 lines
2.0 KiB
C
90 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 <hyp/adjust_pc.h>
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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 __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(SYS_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 __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 = 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 = __kvm_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 = __kvm_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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