linux-kernel - [RFC PATCH 16/18] KVM: Advertise KVM_CAP_USERFAULT in KVM_CHECK

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Message-ID: <20240710234222.2333120-17-jthoughton@google.com>
Date: Wed, 10 Jul 2024 23:42:20 +0000
From: James Houghton <jthoughton@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	James Morse <james.morse@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Sean Christopherson <seanjc@...gle.com>, Shuah Khan <shuah@...nel.org>, 
	Peter Xu <peterx@...hat.org>, Axel Rasmussen <axelrasmussen@...gle.com>, 
	David Matlack <dmatlack@...gle.com>, James Houghton <jthoughton@...gle.com>, kvm@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev
Subject: [RFC PATCH 16/18] KVM: Advertise KVM_CAP_USERFAULT in KVM_CHECK_EXTENSION

Advertise support for KVM_CAP_USERFAULT when CONFIG_KVM_USERFAULT is
enabled.

Signed-off-by: James Houghton <jthoughton@...gle.com>
---
 virt/kvm/kvm_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d2ca16ddcaa1..90ce6b8ff0ab 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4916,6 +4916,10 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
 #ifdef CONFIG_KVM_PRIVATE_MEM
 	case KVM_CAP_GUEST_MEMFD:
 		return !kvm || kvm_arch_has_private_mem(kvm);
+#endif
+#ifdef CONFIG_KVM_USERFAULT
+	case KVM_CAP_USERFAULT:
+		return 1;
 #endif
 	default:
 		break;
-- 
2.45.2.993.g49e7a77208-goog