[PATCH v4 15/17] KVM: PPC: Book3S HV: XIVE: activate XIVE exploitation mode

Cédric Le Goater clg at kaod.org
Wed Mar 20 19:37:49 AEDT 2019

Full support for the XIVE native exploitation mode is now available,
advertise the capability KVM_CAP_PPC_IRQ_XIVE for guests running on
PowerNV KVM Hypervisors only. Support for nested guests (pseries KVM
Hypervisor) is not yet available. XIVE should also have been activated
which is default setting on POWER9 systems running a recent Linux

Signed-off-by: Cédric Le Goater <clg at kaod.org>
Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
 arch/powerpc/kvm/powerpc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index b0858ee61460..f54926c78320 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -573,10 +573,11 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
-		 * Return false until all the XIVE infrastructure is
-		 * in place including support for migration.
+		 * We need XIVE to be enabled on the platform (implies
+		 * a POWER9 processor) and the PowerNV platform, as
+		 * nested is not yet supported.
-		r = 0;
+		r = xive_enabled() && !!cpu_has_feature(CPU_FTR_HVMODE);

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