diff mbox series

[5.4,3/4] x86/mm/pat: Don't flush cache if hardware enforces cache coherency across encryption domnains

Message ID 20220311112927.8400-4-liam.merwick@oracle.com (mailing list archive)
State New, archived
Headers show
Series Backport fixes to avoid SEV guest with 380GB+ memory causing host cpu softhang | expand

Commit Message

Liam Merwick March 11, 2022, 11:29 a.m. UTC 
From: Krish Sadhukhan <krish.sadhukhan@oracle.com>

commit 75d1cc0e05af579301ce4e49cf6399be4b4e6e76 upstream.

In some hardware implementations, coherency between the encrypted and
unencrypted mappings of the same physical page is enforced. In such a
system, it is not required for software to flush the page from all CPU
caches in the system prior to changing the value of the C-bit for the
page. So check that bit before flushing the cache.

 [ bp: Massage commit message. ]

Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200917212038.5090-3-krish.sadhukhan@oracle.com
Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
---
 arch/x86/mm/pageattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 281e584cfe39..d61313f5c5b9 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1967,7 +1967,7 @@  static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
 	/*
 	 * Before changing the encryption attribute, we need to flush caches.
 	 */
-	cpa_flush(&cpa, 1);
+	cpa_flush(&cpa, !this_cpu_has(X86_FEATURE_SME_COHERENT));
 
 	ret = __change_page_attr_set_clr(&cpa, 1);