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| author | Srikar Dronamraju <srikar@linux.vnet.ibm.com> | 2020-12-02 08:04:55 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 17:01:22 +0300 |
| commit | a21d1becaa3f17a97b933ffa677b526afc514ec5 (patch) | |
| tree | de21858ceb451f68dfc3a3120f7ab8fa862d1585 /arch/powerpc/kernel/firmware.c | |
| parent | 16520a858a995742c2d2248e86a6026bd0316562 (diff) | |
| download | linux-a21d1becaa3f17a97b933ffa677b526afc514ec5.tar.xz | |
powerpc: Reintroduce is_kvm_guest() as a fast-path check
Introduce a static branch that would be set during boot if the OS
happens to be a KVM guest. Subsequent checks to see if we are on KVM
will rely on this static branch. This static branch would be used in
vcpu_is_preempted() in a subsequent patch.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201202050456.164005-4-srikar@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/firmware.c')
| -rw-r--r-- | arch/powerpc/kernel/firmware.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c index c3140c6084c9..c9e2819b095a 100644 --- a/arch/powerpc/kernel/firmware.c +++ b/arch/powerpc/kernel/firmware.c @@ -22,6 +22,7 @@ EXPORT_SYMBOL_GPL(powerpc_firmware_features); #endif #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST) +DEFINE_STATIC_KEY_FALSE(kvm_guest); bool check_kvm_guest(void) { struct device_node *hyper_node; @@ -33,6 +34,7 @@ bool check_kvm_guest(void) if (!of_device_is_compatible(hyper_node, "linux,kvm")) return false; + static_branch_enable(&kvm_guest); return true; } #endif |