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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-09 12:49:55 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-15 09:45:06 +0100 |
| commit | e7f1d1eef482150a64a6e6ad8faf40f8f97eed67 (patch) | |
| tree | 775d0180010de525234429766897b116b09ef769 | |
| parent | 2873b5082c5fbe2037f12e8d2abc8ad8f8d82a1b (diff) | |
| download | linux-e7f1d1eef482150a64a6e6ad8faf40f8f97eed67.tar.bz2 | |
KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access
A read-from-write-only GICv3 access should UNDEF at EL1. But since
we're in complete paranoia-land with broken CPUs, let's assume the
worse and gracefully handle the case.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 12 | ||||
| -rw-r--r-- | virt/kvm/arm/hyp/vgic-v3-sr.c | 4 |
2 files changed, 12 insertions, 4 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 0fe27024a2e1..8d51c075966d 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -56,7 +56,8 @@ */ static bool read_from_write_only(struct kvm_vcpu *vcpu, - const struct sys_reg_params *params) + struct sys_reg_params *params, + const struct sys_reg_desc *r) { WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n"); print_sys_reg_instr(params); @@ -93,7 +94,7 @@ static bool access_dcsw(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { if (!p->is_write) - return read_from_write_only(vcpu, p); + return read_from_write_only(vcpu, p, r); kvm_set_way_flush(vcpu); return true; @@ -135,7 +136,7 @@ static bool access_gic_sgi(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { if (!p->is_write) - return read_from_write_only(vcpu, p); + return read_from_write_only(vcpu, p, r); vgic_v3_dispatch_sgi(vcpu, p->regval); @@ -773,7 +774,7 @@ static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p, return trap_raz_wi(vcpu, p, r); if (!p->is_write) - return read_from_write_only(vcpu, p); + return read_from_write_only(vcpu, p, r); if (pmu_write_swinc_el0_disabled(vcpu)) return false; @@ -953,7 +954,10 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 }, + { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only }, + { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only }, { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi }, + { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only }, { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index 15b557697086..b26ce58b012a 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -980,6 +980,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) break; case SYS_ICC_EOIR0_EL1: case SYS_ICC_EOIR1_EL1: + if (unlikely(is_read)) + return 0; fn = __vgic_v3_write_eoir; break; case SYS_ICC_GRPEN1_EL1: @@ -1039,6 +1041,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) fn = __vgic_v3_write_bpr0; break; case SYS_ICC_DIR_EL1: + if (unlikely(is_read)) + return 0; fn = __vgic_v3_write_dir; break; case SYS_ICC_RPR_EL1: |