linux-kernel - [tip: x86/mm] x86/mm: Fix PAGE_KERNEL

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Date:   Thu, 02 Dec 2021 18:15:07 -0000
From:   "tip-bot2 for Joerg Roedel" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Joerg Roedel <jroedel@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/mm: Fix PAGE_KERNEL_IO removal breakage

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     9a951429b2e1670a76b68c90880b01430fe509e4
Gitweb:        https://git.kernel.org/tip/9a951429b2e1670a76b68c90880b01430fe509e4
Author:        Joerg Roedel <jroedel@...e.de>
AuthorDate:    Thu, 02 Dec 2021 15:46:46 +01:00
Committer:     Dave Hansen <dave.hansen@...ux.intel.com>
CommitterDate: Thu, 02 Dec 2021 09:41:24 -08:00

x86/mm: Fix PAGE_KERNEL_IO removal breakage

The removal of PAGE_KERNEL_IO broke SEV-ES because it changed the
mapping of ioremap and some fixmap areas (like the local APIC page)
from unencrypted to encrypted. Change those mappings back to
be unencrypted.

Fixes: 27dff0f58bde ("x86/mm: Nuke PAGE_KERNEL_IO")
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@...el.com>
Tested-by: Tom Lendacky <thomas.lendacky@....com>
Link: https://lkml.kernel.org/r/20211202144646.23186-1-joro@8bytes.org
---
 arch/x86/include/asm/fixmap.h        |  2 +-
 arch/x86/include/asm/pgtable_types.h | 21 +++++++++++----------
 arch/x86/mm/ioremap.c                |  2 +-
 3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 5e186a6..a2eaf26 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -173,7 +173,7 @@ static inline void __set_fixmap(enum fixed_addresses idx,
  * supported for MMIO addresses, so make sure that the memory encryption
  * mask is not part of the page attributes.
  */
-#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
+#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE_NOENC
 
 /*
  * Early memremap routines used for in-place encryption. The mappings created
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index a872247..fc9b699 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -208,16 +208,17 @@ enum page_cache_mode {
 
 #define __pgprot_mask(x)	__pgprot((x) & __default_kernel_pte_mask)
 
-#define PAGE_KERNEL		__pgprot_mask(__PAGE_KERNEL            | _ENC)
-#define PAGE_KERNEL_NOENC	__pgprot_mask(__PAGE_KERNEL            |    0)
-#define PAGE_KERNEL_RO		__pgprot_mask(__PAGE_KERNEL_RO         | _ENC)
-#define PAGE_KERNEL_EXEC	__pgprot_mask(__PAGE_KERNEL_EXEC       | _ENC)
-#define PAGE_KERNEL_EXEC_NOENC	__pgprot_mask(__PAGE_KERNEL_EXEC       |    0)
-#define PAGE_KERNEL_ROX		__pgprot_mask(__PAGE_KERNEL_ROX        | _ENC)
-#define PAGE_KERNEL_NOCACHE	__pgprot_mask(__PAGE_KERNEL_NOCACHE    | _ENC)
-#define PAGE_KERNEL_LARGE	__pgprot_mask(__PAGE_KERNEL_LARGE      | _ENC)
-#define PAGE_KERNEL_LARGE_EXEC	__pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC)
-#define PAGE_KERNEL_VVAR	__pgprot_mask(__PAGE_KERNEL_VVAR       | _ENC)
+#define PAGE_KERNEL			__pgprot_mask(__PAGE_KERNEL            | _ENC)
+#define PAGE_KERNEL_NOENC		__pgprot_mask(__PAGE_KERNEL            |    0)
+#define PAGE_KERNEL_RO			__pgprot_mask(__PAGE_KERNEL_RO         | _ENC)
+#define PAGE_KERNEL_EXEC		__pgprot_mask(__PAGE_KERNEL_EXEC       | _ENC)
+#define PAGE_KERNEL_EXEC_NOENC		__pgprot_mask(__PAGE_KERNEL_EXEC       |    0)
+#define PAGE_KERNEL_ROX			__pgprot_mask(__PAGE_KERNEL_ROX        | _ENC)
+#define PAGE_KERNEL_NOCACHE		__pgprot_mask(__PAGE_KERNEL_NOCACHE    | _ENC)
+#define PAGE_KERNEL_NOCACHE_NOENC	__pgprot_mask(__PAGE_KERNEL_NOCACHE    |    0)
+#define PAGE_KERNEL_LARGE		__pgprot_mask(__PAGE_KERNEL_LARGE      | _ENC)
+#define PAGE_KERNEL_LARGE_EXEC		__pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC)
+#define PAGE_KERNEL_VVAR		__pgprot_mask(__PAGE_KERNEL_VVAR       | _ENC)
 
 #endif	/* __ASSEMBLY__ */
 
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 3102dda..4fe8d43 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -243,7 +243,7 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size,
 	 * make sure the memory encryption attribute is enabled in the
 	 * resulting mapping.
 	 */
-	prot = PAGE_KERNEL;
+	prot = PAGE_KERNEL_NOENC;
 	if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted)
 		prot = pgprot_encrypted(prot);