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percpu: Separate decrypted varaibles anytime encryption can be enabled 

CONFIG_VIRTUALIZATION may not be enabled for memory encrypted guests.  If
disabled, decrypted per-CPU variables may end up sharing the same page
with variables that should be left encrypted.

Always separate per-CPU variables that should be decrypted into their own
page anytime memory encryption can be enabled in the guest rather than
rely on any other config option that may not be enabled.

Fixes: ac26963a11 ("percpu: Introduce DEFINE_PER_CPU_DECRYPTED")
Cc: stable@vger.kernel.org # 4.15+
Signed-off-by: Erdem Aktas <erdemaktas@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
This commit is contained in:
Erdem Aktas 2019-12-13 13:31:46 -08:00 committed by Dennis Zhou
parent becef184df
commit 264b0d2bee
1 changed files with 1 additions and 2 deletions
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3
include/linux/percpu-defs.h
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@ -175,8 +175,7 @@
* Declaration/definition used for per-CPU variables that should be accessed * Declaration/definition used for per-CPU variables that should be accessed
* as decrypted when memory encryption is enabled in the guest. * as decrypted when memory encryption is enabled in the guest.
*/ */
#if defined(CONFIG_VIRTUALIZATION) && defined(CONFIG_AMD_MEM_ENCRYPT) #ifdef CONFIG_AMD_MEM_ENCRYPT
#define DECLARE_PER_CPU_DECRYPTED(type, name) \ #define DECLARE_PER_CPU_DECRYPTED(type, name) \
DECLARE_PER_CPU_SECTION(type, name, "..decrypted") DECLARE_PER_CPU_SECTION(type, name, "..decrypted")