linux-kernel - [PATCH 4.19 142/313] KVM: PPC: Book3S: Only report KVM_CAP_SPAPR_TCE

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Message-Id: <20190211141903.121562526@linuxfoundation.org>
Date:   Mon, 11 Feb 2019 15:17:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Suraj Jitindar Singh <sjitindarsingh@...il.com>,
        Paul Mackerras <paulus@...abs.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 142/313] KVM: PPC: Book3S: Only report KVM_CAP_SPAPR_TCE_VFIO on powernv machines

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 693ac10a88a2219bde553b2e8460dbec97e594e6 ]

The kvm capability KVM_CAP_SPAPR_TCE_VFIO is used to indicate the
availability of in kernel tce acceleration for vfio. However it is
currently the case that this is only available on a powernv machine,
not for a pseries machine.

Thus make this capability dependent on having the cpu feature
CPU_FTR_HVMODE.

[paulus@...abs.org - fixed compilation for Book E.]

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@...il.com>
Signed-off-by: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 eba5756d5b41..79b79408d92e 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -543,8 +543,11 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 #ifdef CONFIG_PPC_BOOK3S_64
 	case KVM_CAP_SPAPR_TCE:
 	case KVM_CAP_SPAPR_TCE_64:
-		/* fallthrough */
+		r = 1;
+		break;
 	case KVM_CAP_SPAPR_TCE_VFIO:
+		r = !!cpu_has_feature(CPU_FTR_HVMODE);
+		break;
 	case KVM_CAP_PPC_RTAS:
 	case KVM_CAP_PPC_FIXUP_HCALL:
 	case KVM_CAP_PPC_ENABLE_HCALL:
-- 
2.19.1