From: Ricardo Neri <ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Matt Fleming <matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Ricardo Neri
<ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: [PATCH 4/5] x86/efi: Save and restore FPU context around efi_calls (x86_64)
Date: Thu, 27 Mar 2014 15:10:42 -0700 [thread overview]
Message-ID: <1395958243-14458-5-git-send-email-ricardo.neri-calderon@linux.intel.com> (raw)
In-Reply-To: <1395958243-14458-1-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Do a complete FPU context save/restore around the EFI calls. This required
as runtime EFI firmware may potentially use the FPU.
This change covers only the x86_64 configuration.
Signed-off-by: Ricardo Neri <ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
arch/x86/include/asm/efi.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 004bbf1..fc99bd1 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -1,6 +1,7 @@
#ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H
+#include <asm/i387.h>
/*
* We map the EFI regions needed for runtime services non-contiguously,
* with preserved alignment on virtual addresses starting from -4G down
@@ -52,7 +53,9 @@ extern u64 asmlinkage efi_call(void *fp, ...);
\
efi_sync_low_kernel_mappings(); \
preempt_disable(); \
+ __kernel_fpu_begin(); \
__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
+ __kernel_fpu_end(); \
preempt_enable(); \
__s; \
})
--
1.8.1.2
next prev parent reply other threads:[~2014-03-27 22:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-27 22:10 [PATCH 0/5] x86/efi: Implement FPU context save/restore Ricardo Neri
[not found] ` <1395958243-14458-1-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-03-27 22:10 ` [PATCH 1/5] x86/efi: Delete most of the efi_call* macros Ricardo Neri
2014-03-27 22:10 ` [PATCH 2/5] x86, fpu: Extend the use of static_cpu_has_safe Ricardo Neri
2014-03-27 22:10 ` [PATCH 3/5] x86/efi: Implement a __efi_call_virt macro Ricardo Neri
2014-03-27 22:10 ` Ricardo Neri [this message]
2014-03-27 22:10 ` [PATCH 5/5] x86/efi: Save and restore FPU context around efi_calls (i386) Ricardo Neri
2014-04-04 11:11 ` [PATCH 0/5] x86/efi: Implement FPU context save/restore Matt Fleming
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=1395958243-14458-5-git-send-email-ricardo.neri-calderon@linux.intel.com \
--to=ricardo.neri-calderon-vuqaysv1563yd54fqh9/ca@public.gmane.org \
--cc=linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.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;
as well as URLs for NNTP newsgroup(s).