From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH] x86/mm: Avoid paravirtualization calls in native_set_p4d()
Date: Wed, 28 Feb 2018 18:00:22 +0300 [thread overview]
Message-ID: <20180228150022.88560-1-kirill.shutemov@linux.intel.com> (raw)
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@linux.intel.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.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
next reply other threads:[~2018-02-28 15:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-28 15:00 Kirill A. Shutemov [this message]
2018-03-02 12:16 ` Thomas Gleixner
2018-03-05 8:16 ` [PATCH] x86/mm: Do not use paravirtualized " Kirill A. Shutemov
2018-03-12 12:16 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180228150022.88560-1-kirill.shutemov@linux.intel.com \
--to=kirill.shutemov@linux.intel.com \
--cc=fengguang.wu@intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome