diff options
author | Wei Liu <wei.liu@kernel.org> | 2021-02-03 18:04:21 +0300 |
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committer | Wei Liu <wei.liu@kernel.org> | 2021-02-11 11:47:05 +0300 |
commit | e997720202b363ba8000d769f114e3c2c5822227 (patch) | |
tree | 228aa21a4d103b3a22408103852b6f9f6da9a8b5 /arch/x86/include/asm/hyperv-tlfs.h | |
parent | 8f1d14cb835672cd27f6533f22f4c73e60a30727 (diff) | |
download | linux-e997720202b363ba8000d769f114e3c2c5822227.tar.xz |
x86/hyperv: detect if Linux is the root partition
For now we can use the privilege flag to check. Stash the value to be
used later.
Put in a bunch of defines for future use when we want to have more
fine-grained detection.
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210203150435.27941-3-wei.liu@kernel.org
Diffstat (limited to 'arch/x86/include/asm/hyperv-tlfs.h')
-rw-r--r-- | arch/x86/include/asm/hyperv-tlfs.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 6aed936e5e96..e3a6a723d661 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -21,6 +21,7 @@ #define HYPERV_CPUID_FEATURES 0x40000003 #define HYPERV_CPUID_ENLIGHTMENT_INFO 0x40000004 #define HYPERV_CPUID_IMPLEMENT_LIMITS 0x40000005 +#define HYPERV_CPUID_CPU_MANAGEMENT_FEATURES 0x40000007 #define HYPERV_CPUID_NESTED_FEATURES 0x4000000A #define HYPERV_CPUID_ISOLATION_CONFIG 0x4000000C @@ -112,6 +113,15 @@ #define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED BIT(14) /* + * CPU management features identification. + * These are HYPERV_CPUID_CPU_MANAGEMENT_FEATURES.EAX bits. + */ +#define HV_X64_START_LOGICAL_PROCESSOR BIT(0) +#define HV_X64_CREATE_ROOT_VIRTUAL_PROCESSOR BIT(1) +#define HV_X64_PERFORMANCE_COUNTER_SYNC BIT(2) +#define HV_X64_RESERVED_IDENTITY_BIT BIT(31) + +/* * Virtual processor will never share a physical core with another virtual * processor, except for virtual processors that are reported as sibling SMT * threads. |