LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: Andy Lutomirski <luto@kernel.org>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Markus T Metzger <markus.t.metzger@intel.com>,
	"Ravi V . Shankar" <ravi.v.shankar@intel.com>,
	"Chang S . Bae" <chang.seok.bae@intel.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 3/7] x86/fsgsbase/64: Use FS/GS base helpers in core dump
Date: Thu,  7 Jun 2018 10:06:04 -0700	[thread overview]
Message-ID: <1528391168-22224-4-git-send-email-chang.seok.bae@intel.com> (raw)
In-Reply-To: <1528391168-22224-1-git-send-email-chang.seok.bae@intel.com>

When new FSGSBASE instructions enabled, this read will
become faster.

Based-on-code-from: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/include/asm/elf.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 0d157d2..49acefb 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -10,6 +10,7 @@
 #include <asm/ptrace.h>
 #include <asm/user.h>
 #include <asm/auxvec.h>
+#include <asm/fsgsbase.h>
 
 typedef unsigned long elf_greg_t;
 
@@ -205,7 +206,6 @@ void set_personality_ia32(bool);
 
 #define ELF_CORE_COPY_REGS(pr_reg, regs)			\
 do {								\
-	unsigned long base;					\
 	unsigned v;						\
 	(pr_reg)[0] = (regs)->r15;				\
 	(pr_reg)[1] = (regs)->r14;				\
@@ -228,8 +228,8 @@ do {								\
 	(pr_reg)[18] = (regs)->flags;				\
 	(pr_reg)[19] = (regs)->sp;				\
 	(pr_reg)[20] = (regs)->ss;				\
-	rdmsrl(MSR_FS_BASE, base); (pr_reg)[21] = base;		\
-	rdmsrl(MSR_KERNEL_GS_BASE, base); (pr_reg)[22] = base;	\
+	(pr_reg)[21] = read_fsbase();				\
+	(pr_reg)[22] = read_inactive_gsbase();			\
 	asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;	\
 	asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;	\
 	asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;	\
-- 
2.7.4

  parent reply	other threads:[~2018-06-07 17:07 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-07 17:06 [PATCH v3 0/7] x86: infrastructure to enable FSGSBASE Chang S. Bae
2018-06-07 17:06 ` [PATCH v3 1/7] x86/fsgsbase/64: Introduce FS/GS base helper functions Chang S. Bae
2018-06-07 17:06 ` [PATCH v3 2/7] x86/fsgsbase/64: Make ptrace read FS/GS base accurately Chang S. Bae
2018-06-07 17:06 ` Chang S. Bae [this message]
2018-06-07 17:06 ` [PATCH v3 4/7] x86/fsgsbase/64: Factor out load FS/GS segments from __switch_to Chang S. Bae
2018-06-18 22:06   ` Andy Lutomirski
2018-06-07 17:06 ` [PATCH v3 5/7] x86/segments/64: Rename PER_CPU segment to CPU_NUMBER Chang S. Bae
2018-06-07 17:06 ` [PATCH v3 6/7] x86/vdso: Introduce CPU number helper functions Chang S. Bae
2018-06-18 22:07   ` Andy Lutomirski
2018-06-07 17:06 ` [PATCH v3 7/7] x86/vdso: Move out the CPU number store Chang S. Bae
2018-06-18 22:08   ` Andy Lutomirski
2018-06-18 23:12     ` Bae, Chang Seok

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=1528391168-22224-4-git-send-email-chang.seok.bae@intel.com \
    --to=chang.seok.bae@intel.com \
    --cc=ak@linux.intel.com \
    --cc=dave.hansen@linux.intel.com \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=markus.t.metzger@intel.com \
    --cc=mingo@kernel.org \
    --cc=ravi.v.shankar@intel.com \
    --cc=tglx@linutronix.de \
    --subject='Re: [PATCH v3 3/7] x86/fsgsbase/64: Use FS/GS base helpers in core dump' \
    /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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).