FAILED: patch "[PATCH] KVM: MMU: Reset mmu->pkru_mask to avoid stale data" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a3ca5281bb771d8103ea16f0a6a8a5df9a7fb4f3 Mon Sep 17 00:00:00 2001
From: Chenyi Qiang <[email protected]>
Date: Thu, 21 Oct 2021 15:10:22 +0800
Subject: [PATCH] KVM: MMU: Reset mmu->pkru_mask to avoid stale data

When updating mmu->pkru_mask, the value can only be added but it isn't reset in advance. This will make mmu->pkru_mask keep the stale data. Fix this issue.

Message-Id: <[email protected]>

index 1a64ba5b9437..0cc58901bf7a 100644
@@ -4596,10 +4596,10 @@ static void update_pkru_bitmask(struct kvm_mmu *mmu)
 	unsigned bit;
 	bool wp;
 
-	if (!is_cr4_pke(mmu)) {
-		mmu->pkru_mask = 0;
+	mmu->pkru_mask = 0;
+
+	if (!is_cr4_pke(mmu))
 		return;
-	}
 
 	wp = is_cr0_wp(mmu);