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| author | Jinank Jain <jinankjain@linux.microsoft.com> | 2023-01-02 07:12:51 +0000 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-01-12 15:23:26 +0000 |
| commit | c4bdf94f97c86bdee8bacc87f8f85dc67866c928 (patch) | |
| tree | 0fb80013913a5eb1966a31e39e7771120cdcb7e9 /arch/x86/include/asm/hyperv-tlfs.h | |
| parent | b7bfaa761d760e72a969d116517eaa12e404c262 (diff) | |
| download | linux-c4bdf94f97c86bdee8bacc87f8f85dc67866c928.tar.gz linux-c4bdf94f97c86bdee8bacc87f8f85dc67866c928.tar.bz2 linux-c4bdf94f97c86bdee8bacc87f8f85dc67866c928.zip | |
x86/hyperv: Add support for detecting nested hypervisor
Detect if Linux is running as a nested hypervisor in the root
partition for Microsoft Hypervisor, using flags provided by MSHV.
Expose a new variable hv_nested that is used later for decisions
specific to the nested use case.
Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/8e3e7112806e81d2292a66a56fe547162754ecea.1672639707.git.jinankjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/hyperv-tlfs.h')
| -rw-r--r-- | arch/x86/include/asm/hyperv-tlfs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 08e822bd7aa6..724a2589c0e7 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -116,6 +116,9 @@ /* Recommend using the newer ExProcessorMasks interface */ #define HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED BIT(11) +/* Indicates that the hypervisor is nested within a Hyper-V partition. */ +#define HV_X64_HYPERV_NESTED BIT(12) + /* Recommend using enlightened VMCS */ #define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED BIT(14) |