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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 /drivers/hv | |
| parent | b7bfaa761d760e72a969d116517eaa12e404c262 (diff) | |
| download | lwn-c4bdf94f97c86bdee8bacc87f8f85dc67866c928.tar.gz lwn-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 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_common.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index ae68298c0dca..52a6f89ccdbd 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -25,17 +25,20 @@ #include <asm/mshyperv.h> /* - * hv_root_partition and ms_hyperv are defined here with other Hyper-V - * specific globals so they are shared across all architectures and are + * hv_root_partition, ms_hyperv and hv_nested are defined here with other + * Hyper-V specific globals so they are shared across all architectures and are * built only when CONFIG_HYPERV is defined. But on x86, * ms_hyperv_init_platform() is built even when CONFIG_HYPERV is not - * defined, and it uses these two variables. So mark them as __weak + * defined, and it uses these three variables. So mark them as __weak * here, allowing for an overriding definition in the module containing * ms_hyperv_init_platform(). */ bool __weak hv_root_partition; EXPORT_SYMBOL_GPL(hv_root_partition); +bool __weak hv_nested; +EXPORT_SYMBOL_GPL(hv_nested); + struct ms_hyperv_info __weak ms_hyperv; EXPORT_SYMBOL_GPL(ms_hyperv); |