Commit ebbfc978 authored by Yin Fengwei's avatar Yin Fengwei Committed by Greg Kroah-Hartman

x86/acrn: Introduce acrn_cpuid_base() and hypervisor feature bits

ACRN Hypervisor reports hypervisor features via CPUID leaf 0x40000001
which is similar to KVM. A VM can check if it's the privileged VM using
the feature bits. The Service VM is the only privileged VM by design.

Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Fengwei Yin <fengwei.yin@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Acked-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarYin Fengwei <fengwei.yin@intel.com>
Signed-off-by: default avatarShuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-4-shuo.a.liu@intel.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7995700e
......@@ -2,7 +2,23 @@
#ifndef _ASM_X86_ACRN_H
#define _ASM_X86_ACRN_H
/*
* This CPUID returns feature bitmaps in EAX.
* Guest VM uses this to detect the appropriate feature bit.
*/
#define ACRN_CPUID_FEATURES 0x40000001
/* Bit 0 indicates whether guest VM is privileged */
#define ACRN_FEATURE_PRIVILEGED_VM BIT(0)
void acrn_setup_intr_handler(void (*handler)(void));
void acrn_remove_intr_handler(void);
static inline u32 acrn_cpuid_base(void)
{
if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
return hypervisor_cpuid_base("ACRNACRNACRN", 0);
return 0;
}
#endif /* _ASM_X86_ACRN_H */
......@@ -21,7 +21,7 @@
static u32 __init acrn_detect(void)
{
return hypervisor_cpuid_base("ACRNACRNACRN", 0);
return acrn_cpuid_base();
}
static void __init acrn_init_platform(void)
......
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