51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#define pr_fmt(fmt) "smccc: KVM: " fmt
|
|
|
|
#include <linux/arm-smccc.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <asm/hypervisor.h>
|
|
|
|
static DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) __ro_after_init = { };
|
|
|
|
void __init kvm_init_hyp_services(void)
|
|
{
|
|
struct arm_smccc_res res;
|
|
u32 val[4];
|
|
|
|
if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
|
|
return;
|
|
|
|
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
|
|
if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 ||
|
|
res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 ||
|
|
res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 ||
|
|
res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3)
|
|
return;
|
|
|
|
memset(&res, 0, sizeof(res));
|
|
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID, &res);
|
|
|
|
val[0] = lower_32_bits(res.a0);
|
|
val[1] = lower_32_bits(res.a1);
|
|
val[2] = lower_32_bits(res.a2);
|
|
val[3] = lower_32_bits(res.a3);
|
|
|
|
bitmap_from_arr32(__kvm_arm_hyp_services, val, ARM_SMCCC_KVM_NUM_FUNCS);
|
|
|
|
pr_info("hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n",
|
|
res.a3, res.a2, res.a1, res.a0);
|
|
}
|
|
|
|
bool kvm_arm_hyp_service_available(u32 func_id)
|
|
{
|
|
if (func_id >= ARM_SMCCC_KVM_NUM_FUNCS)
|
|
return false;
|
|
|
|
return test_bit(func_id, __kvm_arm_hyp_services);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_arm_hyp_service_available);
|