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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-09 12:49:34 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-15 09:44:59 +0100 |
| commit | d70c7b31a60f2458f35c226131f2a01a7a98b6cf (patch) | |
| tree | 12d2b4500986369dc5bc3f2ae7b8d693f0d3209a | |
| parent | 59da1cbfd840d69bd7a310249924da3fc202c417 (diff) | |
| download | lwn-d70c7b31a60f2458f35c226131f2a01a7a98b6cf.tar.gz lwn-d70c7b31a60f2458f35c226131f2a01a7a98b6cf.zip | |
KVM: arm64: vgic-v3: Add ICV_BPR1_EL1 handler
Add a handler for reading/writing the guest's view of the ICC_BPR1_EL1
register, which is located in the ICH_VMCR_EL2.BPR1 field.
Tested-by: Alexander Graf <agraf@suse.de>
Acked-by: David Daney <david.daney@cavium.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
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-- | virt/kvm/arm/hyp/vgic-v3-sr.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index e6c05b95a1b1..fe021abc8b51 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -375,6 +375,57 @@ void __hyp_text __vgic_v3_write_vmcr(u32 vmcr) #ifdef CONFIG_ARM64 +static int __hyp_text __vgic_v3_bpr_min(void) +{ + /* See Pseudocode for VPriorityGroup */ + return 8 - vtr_to_nr_pre_bits(read_gicreg(ICH_VTR_EL2)); +} + +static unsigned int __hyp_text __vgic_v3_get_bpr0(u32 vmcr) +{ + return (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT; +} + +static unsigned int __hyp_text __vgic_v3_get_bpr1(u32 vmcr) +{ + unsigned int bpr; + + if (vmcr & ICH_VMCR_CBPR_MASK) { + bpr = __vgic_v3_get_bpr0(vmcr); + if (bpr < 7) + bpr++; + } else { + bpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT; + } + + return bpr; +} + +static void __hyp_text __vgic_v3_read_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) +{ + vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr1(vmcr)); +} + +static void __hyp_text __vgic_v3_write_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) +{ + u64 val = vcpu_get_reg(vcpu, rt); + u8 bpr_min = __vgic_v3_bpr_min(); + + if (vmcr & ICH_VMCR_CBPR_MASK) + return; + + /* Enforce BPR limiting */ + if (val < bpr_min) + val = bpr_min; + + val <<= ICH_VMCR_BPR1_SHIFT; + val &= ICH_VMCR_BPR1_MASK; + vmcr &= ~ICH_VMCR_BPR1_MASK; + vmcr |= val; + + __vgic_v3_write_vmcr(vmcr); +} + int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) { int rt; @@ -397,6 +448,12 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ; switch (sysreg) { + case SYS_ICC_BPR1_EL1: + if (is_read) + fn = __vgic_v3_read_bpr1; + else + fn = __vgic_v3_write_bpr1; + break; default: return 0; } |