linux-kernel - [PATCHv3 16/17] x86/mm: Handle encrypted memory in page_to_virt() and _

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Message-Id: <20180612143915.68065-17-kirill.shutemov@linux.intel.com>
Date:   Tue, 12 Jun 2018 17:39:14 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv3 16/17] x86/mm: Handle encrypted memory in page_to_virt() and __pa()

Per-KeyID direct mappings require changes into how we find the right
virtual address for a page and virt-to-phys address translations.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/mktme.h   | 3 +++
 arch/x86/include/asm/page_64.h | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h
index efc0d4bb3b35..d6edcabacfc7 100644
--- a/arch/x86/include/asm/mktme.h
+++ b/arch/x86/include/asm/mktme.h
@@ -43,6 +43,9 @@ void mktme_disable(void);
 void setup_direct_mapping_size(void);
 int sync_direct_mapping(void);
 
+#define page_to_virt(x) \
+	(__va(PFN_PHYS(page_to_pfn(x))) + page_keyid(x) * direct_mapping_size)
+
 #else
 #define mktme_keyid_mask	((phys_addr_t)0)
 #define mktme_nr_keyids		0
diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h
index 53c32af895ab..ffad496aadad 100644
--- a/arch/x86/include/asm/page_64.h
+++ b/arch/x86/include/asm/page_64.h
@@ -23,7 +23,7 @@ static inline unsigned long __phys_addr_nodebug(unsigned long x)
 	/* use the carry flag to determine if x was < __START_KERNEL_map */
 	x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
 
-	return x;
+	return x % direct_mapping_size;
 }
 
 #ifdef CONFIG_DEBUG_VIRTUAL
-- 
2.17.1