diff options
-rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 22 | ||||
-rw-r--r-- | arch/arm64/kvm/arm.c | 1 | ||||
-rw-r--r-- | arch/arm64/kvm/nested.c | 41 |
3 files changed, 62 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 527da3d2cedb..8cda003d6267 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -238,6 +238,8 @@ static inline u16 kvm_mpidr_index(struct kvm_mpidr_data *data, u64 mpidr) return index; } +struct kvm_sysreg_masks; + struct kvm_arch { struct kvm_s2_mmu mmu; @@ -312,6 +314,9 @@ struct kvm_arch { #define KVM_ARM_ID_REG_NUM (IDREG_IDX(sys_reg(3, 0, 0, 7, 7)) + 1) u64 id_regs[KVM_ARM_ID_REG_NUM]; + /* Masks for VNCR-baked sysregs */ + struct kvm_sysreg_masks *sysreg_masks; + /* * For an untrusted host VM, 'pkvm.handle' is used to lookup * the associated pKVM instance in the hypervisor. @@ -474,6 +479,13 @@ enum vcpu_sysreg { NR_SYS_REGS /* Nothing after this line! */ }; +struct kvm_sysreg_masks { + struct { + u64 res0; + u64 res1; + } mask[NR_SYS_REGS - __VNCR_START__]; +}; + struct kvm_cpu_context { struct user_pt_regs regs; /* sp = sp_el0 */ @@ -868,7 +880,15 @@ static inline u64 *__ctxt_sys_reg(const struct kvm_cpu_context *ctxt, int r) #define ctxt_sys_reg(c,r) (*__ctxt_sys_reg(c,r)) -#define __vcpu_sys_reg(v,r) (ctxt_sys_reg(&(v)->arch.ctxt, (r))) +u64 kvm_vcpu_sanitise_vncr_reg(const struct kvm_vcpu *, enum vcpu_sysreg); +#define __vcpu_sys_reg(v,r) \ + (*({ \ + const struct kvm_cpu_context *ctxt = &(v)->arch.ctxt; \ + u64 *__r = __ctxt_sys_reg(ctxt, (r)); \ + if (vcpu_has_nv((v)) && (r) >= __VNCR_START__) \ + *__r = kvm_vcpu_sanitise_vncr_reg((v), (r)); \ + __r; \ + })) u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg); void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index a25265aca432..c063e84fc72c 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -206,6 +206,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm) pkvm_destroy_hyp_vm(kvm); kfree(kvm->arch.mpidr_data); + kfree(kvm->arch.sysreg_masks); kvm_destroy_vcpus(kvm); kvm_unshare_hyp(kvm, kvm + 1); diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index d55e809e26cb..c976cd4b8379 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -163,15 +163,54 @@ static u64 limit_nv_id_reg(u32 id, u64 val) return val; } + +u64 kvm_vcpu_sanitise_vncr_reg(const struct kvm_vcpu *vcpu, enum vcpu_sysreg sr) +{ + u64 v = ctxt_sys_reg(&vcpu->arch.ctxt, sr); + struct kvm_sysreg_masks *masks; + + masks = vcpu->kvm->arch.sysreg_masks; + + if (masks) { + sr -= __VNCR_START__; + + v &= ~masks->mask[sr].res0; + v |= masks->mask[sr].res1; + } + + return v; +} + +static void __maybe_unused set_sysreg_masks(struct kvm *kvm, int sr, u64 res0, u64 res1) +{ + int i = sr - __VNCR_START__; + + kvm->arch.sysreg_masks->mask[i].res0 = res0; + kvm->arch.sysreg_masks->mask[i].res1 = res1; +} + int kvm_init_nv_sysregs(struct kvm *kvm) { + int ret = 0; + mutex_lock(&kvm->arch.config_lock); + if (kvm->arch.sysreg_masks) + goto out; + + kvm->arch.sysreg_masks = kzalloc(sizeof(*(kvm->arch.sysreg_masks)), + GFP_KERNEL); + if (!kvm->arch.sysreg_masks) { + ret = -ENOMEM; + goto out; + } + for (int i = 0; i < KVM_ARM_ID_REG_NUM; i++) kvm->arch.id_regs[i] = limit_nv_id_reg(IDX_IDREG(i), kvm->arch.id_regs[i]); +out: mutex_unlock(&kvm->arch.config_lock); - return 0; + return ret; } |