linux-kernel - [PATCH 11/11] powerpc/kvm: Advertise availablity of HPT resizing on KVM HV

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Message-Id: <20161215055404.29351-12-david@gibson.dropbear.id.au>
Date:   Thu, 15 Dec 2016 16:54:04 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     paulus@...ba.org
Cc:     michael@...erman.id.au, benh@...nel.crashing.org,
        sjitindarsingh@...il.com, thuth@...hat.com, lvivier@...hat.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, David Gibson <david@...son.dropbear.id.au>
Subject: [PATCH 11/11] powerpc/kvm: Advertise availablity of HPT resizing on KVM HV

This updates the KVM_CAP_SPAPR_RESIZE_HPT capability to advertise the
presence of in-kernel HPT resizing on KVM HV.  In fact the HPT resizing
isn't fully implemented, but this allows us to experiment with what's
there.

Signed-off-by: David Gibson <david@...son.dropbear.id.au>
---
 arch/powerpc/kvm/powerpc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index bb23923..965d26b 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -606,7 +606,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = 1;
 		break;
 	case KVM_CAP_SPAPR_RESIZE_HPT:
-		r = 1; /* resize allowed only if HPT is outside kernel */
+		if (hv_enabled)
+			r = 2; /* In-kernel resize implementation */
+		else
+			r = 1; /* outside kernel resize allowed */
 		break;
 #endif
 	case KVM_CAP_PPC_HTM:
-- 
2.9.3