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

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Date:   Thu,  2 Dec 2021 15:46:46 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
        Lucas De Marchi <lucas.demarchi@...el.com>
Subject: [PATCH] x86/mm: Fix PAGE_KERNEL_IO removal breakage

From: Joerg Roedel <jroedel@...e.de>

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.

Cc: Lucas De Marchi <lucas.demarchi@...el.com>
Fixes: 27dff0f58bde ("x86/mm: Nuke PAGE_KERNEL_IO")
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 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 5e186a69db10..a2eaf265f784 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 a87224767ff3..fc9b6995cb22 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 3102dda4b152..4fe8d43d53bb 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);
 
-- 
2.34.0