[PATCH] drm/i915/gvt/kvmgt: Fix the build failure in kvmgt.

[Yu Zhang]

Previously, commit 531810caa9f4 ("KVM: x86/mmu: Use
an rwlock for the x86 MMU") replaced KVM's mmu_lock
with type rwlock_t. This will cause a build failure
in kvmgt, which uses the same lock when trying to add/
remove some GFNs to/from the page tracker. Fix it with
write_lock/unlocks in kvmgt.

Reported-by: Stephen Rothwell <sfr at canb.auug.org.au>
Signed-off-by: Yu Zhang <yu.c.zhang at linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 60f1a386dd06..b4348256ae95 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1703,7 +1703,7 @@ static int kvmgt_page_track_add(unsigned long handle, u64 gfn)
 		return -EINVAL;
 	}
 
-	spin_lock(&kvm->mmu_lock);
+	write_lock(&kvm->mmu_lock);
 
 	if (kvmgt_gfn_is_write_protected(info, gfn))
 		goto out;
@@ -1712,7 +1712,7 @@ static int kvmgt_page_track_add(unsigned long handle, u64 gfn)
 	kvmgt_protect_table_add(info, gfn);
 
 out:
-	spin_unlock(&kvm->mmu_lock);
+	write_unlock(&kvm->mmu_lock);
 	srcu_read_unlock(&kvm->srcu, idx);
 	return 0;
 }
@@ -1737,7 +1737,7 @@ static int kvmgt_page_track_remove(unsigned long handle, u64 gfn)
 		return -EINVAL;
 	}
 
-	spin_lock(&kvm->mmu_lock);
+	write_lock(&kvm->mmu_lock);
 
 	if (!kvmgt_gfn_is_write_protected(info, gfn))
 		goto out;
@@ -1746,7 +1746,7 @@ static int kvmgt_page_track_remove(unsigned long handle, u64 gfn)
 	kvmgt_protect_table_del(info, gfn);
 
 out:
-	spin_unlock(&kvm->mmu_lock);
+	write_unlock(&kvm->mmu_lock);
 	srcu_read_unlock(&kvm->srcu, idx);
 	return 0;
 }
@@ -1772,7 +1772,7 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
 	struct kvmgt_guest_info *info = container_of(node,
 					struct kvmgt_guest_info, track_node);
 
-	spin_lock(&kvm->mmu_lock);
+	write_lock(&kvm->mmu_lock);
 	for (i = 0; i < slot->npages; i++) {
 		gfn = slot->base_gfn + i;
 		if (kvmgt_gfn_is_write_protected(info, gfn)) {
@@ -1781,7 +1781,7 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
 			kvmgt_protect_table_del(info, gfn);
 		}
 	}
-	spin_unlock(&kvm->mmu_lock);
+	write_unlock(&kvm->mmu_lock);
 }
 
 static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
-- 
2.17.1