arm_hypercalls.h File Reference

#include <asm/kvm_emulate.h>

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Functions
int	kvm_smccc_call_handler (struct kvm_vcpu *vcpu)
static u32	smccc_get_function (struct kvm_vcpu *vcpu)
static unsigned long	smccc_get_arg1 (struct kvm_vcpu *vcpu)
static unsigned long	smccc_get_arg2 (struct kvm_vcpu *vcpu)
static unsigned long	smccc_get_arg3 (struct kvm_vcpu *vcpu)
static void	smccc_set_retval (struct kvm_vcpu *vcpu, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3)
void	kvm_arm_init_hypercalls (struct kvm *kvm)
void	kvm_arm_teardown_hypercalls (struct kvm *kvm)
int	kvm_arm_get_fw_num_regs (struct kvm_vcpu *vcpu)
int	kvm_arm_copy_fw_reg_indices (struct kvm_vcpu *vcpu, u64 __user *uindices)
int	kvm_arm_get_fw_reg (struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
int	kvm_arm_set_fw_reg (struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
int	kvm_vm_smccc_has_attr (struct kvm *kvm, struct kvm_device_attr *attr)
int	kvm_vm_smccc_set_attr (struct kvm *kvm, struct kvm_device_attr *attr)

Function Documentation

kvm_arm_copy_fw_reg_indices()

int kvm_arm_copy_fw_reg_indices	(	struct kvm_vcpu *	vcpu,
		u64 __user *	uindices
	)

Definition at line 413 of file hypercalls.c.

{
    int i;
 
    for (i = 0; i < ARRAY_SIZE(kvm_arm_fw_reg_ids); i++) {
        if (put_user(kvm_arm_fw_reg_ids[i], uindices++))
            return -EFAULT;
    }
 
    return 0;
}

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kvm_arm_get_fw_num_regs()

int kvm_arm_get_fw_num_regs

(

struct kvm_vcpu *

vcpu

)

Definition at line 408 of file hypercalls.c.

{
    return ARRAY_SIZE(kvm_arm_fw_reg_ids);
}

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kvm_arm_get_fw_reg()

int kvm_arm_get_fw_reg	(	struct kvm_vcpu *	vcpu,
		const struct kvm_one_reg *	reg
	)

Definition at line 476 of file hypercalls.c.

{
    struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
    void __user *uaddr = (void __user *)(long)reg->addr;
    u64 val;
 
    switch (reg->id) {
    case KVM_REG_ARM_PSCI_VERSION:
        val = kvm_psci_version(vcpu);
        break;
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
        val = get_kernel_wa_level(reg->id) & KVM_REG_FEATURE_LEVEL_MASK;
        break;
    case KVM_REG_ARM_STD_BMAP:
        val = READ_ONCE(smccc_feat->std_bmap);
        break;
    case KVM_REG_ARM_STD_HYP_BMAP:
        val = READ_ONCE(smccc_feat->std_hyp_bmap);
        break;
    case KVM_REG_ARM_VENDOR_HYP_BMAP:
        val = READ_ONCE(smccc_feat->vendor_hyp_bmap);
        break;
    default:
        return -ENOENT;
    }
 
    if (copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)))
        return -EFAULT;
 
    return 0;
}

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kvm_arm_init_hypercalls()

void kvm_arm_init_hypercalls

(

struct kvm *

kvm

)

Definition at line 392 of file hypercalls.c.

{
    struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
 
    smccc_feat->std_bmap = KVM_ARM_SMCCC_STD_FEATURES;
    smccc_feat->std_hyp_bmap = KVM_ARM_SMCCC_STD_HYP_FEATURES;
    smccc_feat->vendor_hyp_bmap = KVM_ARM_SMCCC_VENDOR_HYP_FEATURES;
 
    mt_init(&kvm->arch.smccc_filter);
}

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kvm_arm_set_fw_reg()

int kvm_arm_set_fw_reg	(	struct kvm_vcpu *	vcpu,
		const struct kvm_one_reg *	reg
	)

Definition at line 551 of file hypercalls.c.

{
    void __user *uaddr = (void __user *)(long)reg->addr;
    u64 val;
    int wa_level;
 
    if (KVM_REG_SIZE(reg->id) != sizeof(val))
        return -ENOENT;
    if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
        return -EFAULT;
 
    switch (reg->id) {
    case KVM_REG_ARM_PSCI_VERSION:
    {
        bool wants_02;
 
        wants_02 = vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2);
 
        switch (val) {
        case KVM_ARM_PSCI_0_1:
            if (wants_02)
                return -EINVAL;
            vcpu->kvm->arch.psci_version = val;
            return 0;
        case KVM_ARM_PSCI_0_2:
        case KVM_ARM_PSCI_1_0:
        case KVM_ARM_PSCI_1_1:
            if (!wants_02)
                return -EINVAL;
            vcpu->kvm->arch.psci_version = val;
            return 0;
        }
        break;
    }
 
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
        if (val & ~KVM_REG_FEATURE_LEVEL_MASK)
            return -EINVAL;
 
        if (get_kernel_wa_level(reg->id) < val)
            return -EINVAL;
 
        return 0;
 
    case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
        if (val & ~(KVM_REG_FEATURE_LEVEL_MASK |
                KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED))
            return -EINVAL;
 
        /* The enabled bit must not be set unless the level is AVAIL. */
        if ((val & KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED) &&
            (val & KVM_REG_FEATURE_LEVEL_MASK) != KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL)
            return -EINVAL;
 
        /*
         * Map all the possible incoming states to the only two we
         * really want to deal with.
         */
        switch (val & KVM_REG_FEATURE_LEVEL_MASK) {
        case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
        case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
            wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
            break;
        case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
        case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
            wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
            break;
        default:
            return -EINVAL;
        }
 
        /*
         * We can deal with NOT_AVAIL on NOT_REQUIRED, but not the
         * other way around.
         */
        if (get_kernel_wa_level(reg->id) < wa_level)
            return -EINVAL;
 
        return 0;
    case KVM_REG_ARM_STD_BMAP:
    case KVM_REG_ARM_STD_HYP_BMAP:
    case KVM_REG_ARM_VENDOR_HYP_BMAP:
        return kvm_arm_set_fw_reg_bmap(vcpu, reg->id, val);
    default:
        return -ENOENT;
    }
 
    return -EINVAL;
}

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kvm_arm_teardown_hypercalls()

void kvm_arm_teardown_hypercalls

(

struct kvm *

kvm

)

Definition at line 403 of file hypercalls.c.

{
    mtree_destroy(&kvm->arch.smccc_filter);
}

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kvm_smccc_call_handler()

int kvm_smccc_call_handler

(

struct kvm_vcpu *

vcpu

)

Definition at line 263 of file hypercalls.c.

{
    struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
    u32 func_id = smccc_get_function(vcpu);
    u64 val[4] = {SMCCC_RET_NOT_SUPPORTED};
    u32 feature;
    u8 action;
    gpa_t gpa;
 
    action = kvm_smccc_get_action(vcpu, func_id);
    switch (action) {
    case KVM_SMCCC_FILTER_HANDLE:
        break;
    case KVM_SMCCC_FILTER_DENY:
        goto out;
    case KVM_SMCCC_FILTER_FWD_TO_USER:
        kvm_prepare_hypercall_exit(vcpu, func_id);
        return 0;
    default:
        WARN_RATELIMIT(1, "Unhandled SMCCC filter action: %d\n", action);
        goto out;
    }
 
    switch (func_id) {
    case ARM_SMCCC_VERSION_FUNC_ID:
        val[0] = ARM_SMCCC_VERSION_1_1;
        break;
    case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
        feature = smccc_get_arg1(vcpu);
        switch (feature) {
        case ARM_SMCCC_ARCH_WORKAROUND_1:
            switch (arm64_get_spectre_v2_state()) {
            case SPECTRE_VULNERABLE:
                break;
            case SPECTRE_MITIGATED:
                val[0] = SMCCC_RET_SUCCESS;
                break;
            case SPECTRE_UNAFFECTED:
                val[0] = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED;
                break;
            }
            break;
        case ARM_SMCCC_ARCH_WORKAROUND_2:
            switch (arm64_get_spectre_v4_state()) {
            case SPECTRE_VULNERABLE:
                break;
            case SPECTRE_MITIGATED:
                /*
                 * SSBS everywhere: Indicate no firmware
                 * support, as the SSBS support will be
                 * indicated to the guest and the default is
                 * safe.
                 *
                 * Otherwise, expose a permanent mitigation
                 * to the guest, and hide SSBS so that the
                 * guest stays protected.
                 */
                if (cpus_have_final_cap(ARM64_SSBS))
                    break;
                fallthrough;
            case SPECTRE_UNAFFECTED:
                val[0] = SMCCC_RET_NOT_REQUIRED;
                break;
            }
            break;
        case ARM_SMCCC_ARCH_WORKAROUND_3:
            switch (arm64_get_spectre_bhb_state()) {
            case SPECTRE_VULNERABLE:
                break;
            case SPECTRE_MITIGATED:
                val[0] = SMCCC_RET_SUCCESS;
                break;
            case SPECTRE_UNAFFECTED:
                val[0] = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED;
                break;
            }
            break;
        case ARM_SMCCC_HV_PV_TIME_FEATURES:
            if (test_bit(KVM_REG_ARM_STD_HYP_BIT_PV_TIME,
                     &smccc_feat->std_hyp_bmap))
                val[0] = SMCCC_RET_SUCCESS;
            break;
        }
        break;
    case ARM_SMCCC_HV_PV_TIME_FEATURES:
        val[0] = kvm_hypercall_pv_features(vcpu);
        break;
    case ARM_SMCCC_HV_PV_TIME_ST:
        gpa = kvm_init_stolen_time(vcpu);
        if (gpa != INVALID_GPA)
            val[0] = gpa;
        break;
    case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
        val[0] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0;
        val[1] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1;
        val[2] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2;
        val[3] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3;
        break;
    case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
        val[0] = smccc_feat->vendor_hyp_bmap;
        break;
    case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
        kvm_ptp_get_time(vcpu, val);
        break;
    case ARM_SMCCC_TRNG_VERSION:
    case ARM_SMCCC_TRNG_FEATURES:
    case ARM_SMCCC_TRNG_GET_UUID:
    case ARM_SMCCC_TRNG_RND32:
    case ARM_SMCCC_TRNG_RND64:
        return kvm_trng_call(vcpu);
    default:
        return kvm_psci_call(vcpu);
    }
 
out:
    smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
    return 1;
}

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kvm_vm_smccc_has_attr()

int kvm_vm_smccc_has_attr	(	struct kvm *	kvm,
		struct kvm_device_attr *	attr
	)

Definition at line 642 of file hypercalls.c.

{
    switch (attr->attr) {
    case KVM_ARM_VM_SMCCC_FILTER:
        return 0;
    default:
        return -ENXIO;
    }
}

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kvm_vm_smccc_set_attr()

int kvm_vm_smccc_set_attr	(	struct kvm *	kvm,
		struct kvm_device_attr *	attr
	)

Definition at line 652 of file hypercalls.c.

{
    void __user *uaddr = (void __user *)attr->addr;
 
    switch (attr->attr) {
    case KVM_ARM_VM_SMCCC_FILTER:
        return kvm_smccc_set_filter(kvm, uaddr);
    default:
        return -ENXIO;
    }
}

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smccc_get_arg1()

static unsigned long smccc_get_arg1 ( struct kvm_vcpu *  vcpu )

inlinestatic

Definition at line 16 of file arm_hypercalls.h.

{
    return vcpu_get_reg(vcpu, 1);
}

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smccc_get_arg2()

static unsigned long smccc_get_arg2 ( struct kvm_vcpu *  vcpu )

inlinestatic

Definition at line 21 of file arm_hypercalls.h.

{
    return vcpu_get_reg(vcpu, 2);
}

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smccc_get_arg3()

static unsigned long smccc_get_arg3 ( struct kvm_vcpu *  vcpu )

inlinestatic

Definition at line 26 of file arm_hypercalls.h.

{
    return vcpu_get_reg(vcpu, 3);
}

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smccc_get_function()

static u32 smccc_get_function ( struct kvm_vcpu *  vcpu )

inlinestatic

Definition at line 11 of file arm_hypercalls.h.

{
    return vcpu_get_reg(vcpu, 0);
}

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smccc_set_retval()

static void smccc_set_retval ( struct kvm_vcpu *  vcpu, unsigned long  a0, unsigned long  a1, unsigned long  a2, unsigned long  a3  )

inlinestatic

Definition at line 31 of file arm_hypercalls.h.

{
    vcpu_set_reg(vcpu, 0, a0);
    vcpu_set_reg(vcpu, 1, a1);
    vcpu_set_reg(vcpu, 2, a2);
    vcpu_set_reg(vcpu, 3, a3);
}

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