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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2017-06-09 12:49:33 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-15 09:44:59 +0100 |
| commit | 59da1cbfd840d69bd7a310249924da3fc202c417 (patch) | |
| tree | ad84f233aee206101e3738beb47beba0fb09300e /virt | |
| parent | KVM: arm64: Make kvm_condition_valid32() accessible from EL2 (diff) | |
| download | linux-dev-59da1cbfd840d69bd7a310249924da3fc202c417.tar.xz linux-dev-59da1cbfd840d69bd7a310249924da3fc202c417.zip | |
KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2
In order to start handling guest access to GICv3 system registers,
let's add a hook that will get called when we trap a system register
access. This is gated by a new static key (vgic_v3_cpuif_trap).
Tested-by: Alexander Graf <agraf@suse.de>
Acked-by: David Daney <david.daney@cavium.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/hyp/vgic-v3-sr.c | 38 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v3.c | 2 |
2 files changed, 40 insertions, 0 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index 3dd8f0c4419e..e6c05b95a1b1 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -19,6 +19,7 @@ #include <linux/irqchip/arm-gic-v3.h> #include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> #include <asm/kvm_hyp.h> #define vtr_to_max_lr_idx(v) ((v) & 0xf) @@ -371,3 +372,40 @@ void __hyp_text __vgic_v3_write_vmcr(u32 vmcr) { write_gicreg(vmcr, ICH_VMCR_EL2); } + +#ifdef CONFIG_ARM64 + +int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) +{ + int rt; + u32 esr; + u32 vmcr; + void (*fn)(struct kvm_vcpu *, u32, int); + bool is_read; + u32 sysreg; + + esr = kvm_vcpu_get_hsr(vcpu); + if (vcpu_mode_is_32bit(vcpu)) { + if (!kvm_condition_valid(vcpu)) + return 1; + + sysreg = esr_cp15_to_sysreg(esr); + } else { + sysreg = esr_sys64_to_sysreg(esr); + } + + is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ; + + switch (sysreg) { + default: + return 0; + } + + vmcr = __vgic_v3_read_vmcr(); + rt = kvm_vcpu_sys_get_rt(vcpu); + fn(vcpu, vmcr, rt); + + return 1; +} + +#endif diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 030248e669f6..fac6e23cd0b3 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -429,6 +429,8 @@ out: return ret; } +DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap); + /** * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT * @node: pointer to the DT node |