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| author | Jinank Jain <jinankjain@linux.microsoft.com> | 2023-01-02 10:12:53 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-01-17 16:37:19 +0300 |
| commit | f0d2f5c2c000c03aa6b6a29954042174b59a0d1c (patch) | |
| tree | e271a53362519c41a9a2014f202291b7870f42c1 /include/asm-generic/hyperv-tlfs.h | |
| parent | 7fec185a56f45b98d9547982370c2ab33f0f72b5 (diff) | |
| download | linux-f0d2f5c2c000c03aa6b6a29954042174b59a0d1c.tar.xz | |
x86/hyperv: Add an interface to do nested hypercalls
According to TLFS, in order to communicate to L0 hypervisor there needs
to be an additional bit set in the control register. This communication
is required to perform privileged instructions which can only be
performed by L0 hypervisor. An example of that could be setting up the
VMBus infrastructure.
Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/24f9d46d5259a688113e6e5e69e21002647f4949.1672639707.git.jinankjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/asm-generic/hyperv-tlfs.h')
| -rw-r--r-- | include/asm-generic/hyperv-tlfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index e29ccabf2e09..b870983596b9 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -194,6 +194,7 @@ enum HV_GENERIC_SET_FORMAT { #define HV_HYPERCALL_VARHEAD_OFFSET 17 #define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17) #define HV_HYPERCALL_RSVD0_MASK GENMASK_ULL(31, 27) +#define HV_HYPERCALL_NESTED BIT_ULL(31) #define HV_HYPERCALL_REP_COMP_OFFSET 32 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32) |