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// SPDX-License-Identifier: GPL-2.0-only
/*
* Support for the hypercall interface exposed to protected guests by
* pKVM.
*
* Author: Will Deacon <will@kernel.org>
* Copyright (C) 2024 Google LLC
*/
#include <linux/arm-smccc.h>
#include <linux/array_size.h>
#include <linux/mm.h>
#include <asm/hypervisor.h>
static size_t pkvm_granule;
void pkvm_init_hyp_services(void)
{
int i;
struct arm_smccc_res res;
const u32 funcs[] = {
ARM_SMCCC_KVM_FUNC_HYP_MEMINFO,
};
for (i = 0; i < ARRAY_SIZE(funcs); ++i) {
if (!kvm_arm_hyp_service_available(funcs[i]))
return;
}
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_HYP_MEMINFO_FUNC_ID,
0, 0, 0, &res);
if (res.a0 > PAGE_SIZE) /* Includes error codes */
return;
pkvm_granule = res.a0;
}
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