[PATCH] KVM: arm64: Fix meta-page unsharing in pKVM hyp tracing

[Vincent Donnefort]

As the hyp_trace_buffer_unshare_hyp() function name suggests we should
unshare all the previously shared pages, otherwise we leak hyp-shared
pages which won't be reusable for hyp memory.

Fix the typo by calling __unshare_page() on the meta-page, ensuring all
previously shared pages are correctly unshared.

Fixes: 3aed038aac8d ("KVM: arm64: Add trace remote for the nVHE/pKVM hyp")
Signed-off-by: Vincent Donnefort <vdonnefort at google.com>

diff --git a/arch/arm64/kvm/hyp_trace.c b/arch/arm64/kvm/hyp_trace.c
index 8b7f2bf2fba8..06805b426101 100644
--- a/arch/arm64/kvm/hyp_trace.c
+++ b/arch/arm64/kvm/hyp_trace.c
@@ -189,7 +189,7 @@ static void hyp_trace_buffer_unshare_hyp(struct hyp_trace_buffer *trace_buffer,
 		if (cpu > last_cpu)
 			break;
 
-		__share_page(rb_desc->meta_va);
+		__unshare_page(rb_desc->meta_va);
 		for (p = 0; p < rb_desc->nr_page_va; p++)
 			__unshare_page(rb_desc->page_va[p]);
 	}

base-commit: 5200f5f493f79f14bbdc349e402a40dfb32f23c8
-- 
2.54.0.746.g67dd491aae-goog