linux-kernel - [PATCH 5.4 236/309] percpu: Separate decrypted varaibles anytime encryption can be enabled

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Message-Id: <20200210122429.193975577@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:33:12 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Erdem Aktas <erdemaktas@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Dennis Zhou <dennis@...nel.org>
Subject: [PATCH 5.4 236/309] percpu: Separate decrypted varaibles anytime encryption can be enabled

From: Erdem Aktas <erdemaktas@...gle.com>

commit 264b0d2bee148073c117e7bbbde5be7125a53be1 upstream.

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: ac26963a1175 ("percpu: Introduce DEFINE_PER_CPU_DECRYPTED")
Cc: stable@...r.kernel.org # 4.15+
Signed-off-by: Erdem Aktas <erdemaktas@...gle.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Dennis Zhou <dennis@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/percpu-defs.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -175,8 +175,7 @@
  * Declaration/definition used for per-CPU variables that should be accessed
  * 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)				\
 	DECLARE_PER_CPU_SECTION(type, name, "..decrypted")