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ed43125d GKH |
1 | From f7daa9c8fd191724b9ab9580a7be55cd1a67d799 Mon Sep 17 00:00:00 2001 |
2 | From: James Morse <james.morse@arm.com> | |
3 | Date: Thu, 24 Jan 2019 16:32:57 +0000 | |
4 | Subject: arm64: hibernate: Clean the __hyp_text to PoC after resume | |
5 | ||
6 | From: James Morse <james.morse@arm.com> | |
7 | ||
8 | commit f7daa9c8fd191724b9ab9580a7be55cd1a67d799 upstream. | |
9 | ||
10 | During resume hibernate restores all physical memory. Any memory | |
11 | that is accessed with the MMU disabled needs to be cleaned to the | |
12 | PoC. | |
13 | ||
14 | KVMs __hyp_text was previously ommitted as it runs with the MMU | |
15 | enabled, but now that the hyp-stub is located in this section, | |
16 | we must clean __hyp_text too. | |
17 | ||
18 | This ensures secondary CPUs that come online after hibernate | |
19 | has finished resuming, and load KVM via the freshly written | |
20 | hyp-stub see the correct instructions. | |
21 | ||
22 | Signed-off-by: James Morse <james.morse@arm.com> | |
23 | Cc: stable@vger.kernel.org | |
24 | Signed-off-by: Will Deacon <will.deacon@arm.com> | |
25 | Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
26 | ||
27 | --- | |
28 | arch/arm64/kernel/hibernate.c | 4 +++- | |
29 | 1 file changed, 3 insertions(+), 1 deletion(-) | |
30 | ||
31 | --- a/arch/arm64/kernel/hibernate.c | |
32 | +++ b/arch/arm64/kernel/hibernate.c | |
33 | @@ -299,8 +299,10 @@ int swsusp_arch_suspend(void) | |
34 | dcache_clean_range(__idmap_text_start, __idmap_text_end); | |
35 | ||
36 | /* Clean kvm setup code to PoC? */ | |
37 | - if (el2_reset_needed()) | |
38 | + if (el2_reset_needed()) { | |
39 | dcache_clean_range(__hyp_idmap_text_start, __hyp_idmap_text_end); | |
40 | + dcache_clean_range(__hyp_text_start, __hyp_text_end); | |
41 | + } | |
42 | ||
43 | /* make the crash dump kernel image protected again */ | |
44 | crash_post_resume(); |