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// SPDX-License-Identifier: GPL-2.0
/*
* FreeBSD Bhyve guest enlightenments
*
* Copyright © 2025 Amazon.com, Inc. or its affiliates.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*/
#include <linux/init.h>
#include <linux/export.h>
#include <asm/processor.h>
#include <asm/hypervisor.h>
static uint32_t bhyve_cpuid_base;
static uint32_t bhyve_cpuid_max;
#define BHYVE_SIGNATURE "bhyve bhyve "
#define CPUID_BHYVE_FEATURES 0x40000001
/* Features advertised in CPUID_BHYVE_FEATURES %eax */
/* MSI Extended Dest ID */
#define CPUID_BHYVE_FEAT_EXT_DEST_ID (1UL << 0)
static uint32_t __init bhyve_detect(void)
{
if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
return 0;
bhyve_cpuid_base = cpuid_base_hypervisor(BHYVE_SIGNATURE, 0);
if (!bhyve_cpuid_base)
return 0;
bhyve_cpuid_max = cpuid_eax(bhyve_cpuid_base);
return bhyve_cpuid_max;
}
static uint32_t bhyve_features(void)
{
unsigned int cpuid_leaf = bhyve_cpuid_base | CPUID_BHYVE_FEATURES;
if (bhyve_cpuid_max < cpuid_leaf)
return 0;
return cpuid_eax(cpuid_leaf);
}
static bool __init bhyve_ext_dest_id(void)
{
return !!(bhyve_features() & CPUID_BHYVE_FEAT_EXT_DEST_ID);
}
static bool __init bhyve_x2apic_available(void)
{
return true;
}
const struct hypervisor_x86 x86_hyper_bhyve __refconst = {
.name = "Bhyve",
.detect = bhyve_detect,
.init.init_platform = x86_init_noop,
.init.x2apic_available = bhyve_x2apic_available,
.init.msi_ext_dest_id = bhyve_ext_dest_id,
};
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