linux-kernel - [PATCH 4.9 18/30] arm64: hibernate: Clean the __hyp

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Date:   Mon,  4 Feb 2019 11:36:56 +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, James Morse <james.morse@....com>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 4.9 18/30] arm64: hibernate: Clean the __hyp_text to PoC after resume

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

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

From: James Morse <james.morse@....com>

commit f7daa9c8fd191724b9ab9580a7be55cd1a67d799 upstream.

During resume hibernate restores all physical memory. Any memory
that is accessed with the MMU disabled needs to be cleaned to the
PoC.

KVMs __hyp_text was previously ommitted as it runs with the MMU
enabled, but now that the hyp-stub is located in this section,
we must clean __hyp_text too.

This ensures secondary CPUs that come online after hibernate
has finished resuming, and load KVM via the freshly written
hyp-stub see the correct instructions.

Signed-off-by: James Morse <james.morse@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/hibernate.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -297,8 +297,10 @@ int swsusp_arch_suspend(void)
 		dcache_clean_range(__idmap_text_start, __idmap_text_end);
 
 		/* Clean kvm setup code to PoC? */
-		if (el2_reset_needed())
+		if (el2_reset_needed()) {
 			dcache_clean_range(__hyp_idmap_text_start, __hyp_idmap_text_end);
+			dcache_clean_range(__hyp_text_start, __hyp_text_end);
+		}
 
 		/*
 		 * Tell the hibernation core that we've just restored