[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20180228150022.88560-1-kirill.shutemov@linux.intel.com>
Date: Wed, 28 Feb 2018 18:00:22 +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>
Cc: Fengguang Wu <fengguang.wu@...el.com>,
linux-kernel@...r.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH] x86/mm: Avoid paravirtualization calls in native_set_p4d()
p4d_val() and pgd_val() are paravirtualized and we should avoid using
them in native_set_p4d().
Let's replace them with native_p4d_val() and native_pgd_val().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Fixes: 91f606a8fa68 ("x86/mm: Replace compile-time checks for 5-level paging with runtime-time checks")
---
arch/x86/include/asm/pgtable_64.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 81dda8d1d0bd..163e01a0631d 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -224,9 +224,9 @@ static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
return;
}
- pgd = native_make_pgd(p4d_val(p4d));
+ pgd = native_make_pgd(native_p4d_val(p4d));
pgd = pti_set_user_pgd((pgd_t *)p4dp, pgd);
- *p4dp = native_make_p4d(pgd_val(pgd));
+ *p4dp = native_make_p4d(native_pgd_val(pgd));
}
static inline void native_p4d_clear(p4d_t *p4d)
--
2.16.1
Powered by blists - more mailing lists