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powerpc: Reintroduce is_kvm_guest() as a fast-path check

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[ Upstream commit a21d1becaa ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Srikar Dronamraju
2020-12-02 10:34:55 +05:30
committed by Greg Kroah-Hartman
parent 113207234a
commit e01a4d7560
3 changed files with 13 additions and 1 deletions
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2
arch/powerpc/kernel/firmware.c
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@@ -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