From: Andy Lutomirski <luto@kernel.org>
To: X86 ML <x86@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Pavel Machek <pavel@ucw.cz>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Zhang Rui <rui.zhang@intel.com>,
Jarkko Nikula <jarkko.nikula@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH urgent 1/3] x86/power/64: Use struct desc_ptr for the IDT in struct saved_context
Date: Thu, 14 Dec 2017 13:19:05 -0800 [thread overview]
Message-ID: <967909ce38d341b01d45eff53e278e2728a3a93a.1513286253.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1513286253.git.luto@kernel.org>
In-Reply-To: <cover.1513286253.git.luto@kernel.org>
x86_64's saved_context nonsensically used separate idt_limit and
idt_base fields and then cast &idt_limit to struct desc_ptr *. This
was correct (with -fno-strict-aliasing), but it's confusing, served
no purpose, and required ifdeffery. Just use struct desc_ptr
directly.
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/include/asm/suspend_64.h | 3 +--
arch/x86/power/cpu.c | 11 +----------
2 files changed, 2 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/suspend_64.h b/arch/x86/include/asm/suspend_64.h
index 7306e911faee..600e9e0aea51 100644
--- a/arch/x86/include/asm/suspend_64.h
+++ b/arch/x86/include/asm/suspend_64.h
@@ -30,8 +30,7 @@ struct saved_context {
u16 gdt_pad; /* Unused */
struct desc_ptr gdt_desc;
u16 idt_pad;
- u16 idt_limit;
- unsigned long idt_base;
+ struct desc_ptr idt;
u16 ldt;
u16 tss;
unsigned long tr;
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 5191de14f4df..472bc8c8212b 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -82,12 +82,8 @@ static void __save_processor_state(struct saved_context *ctxt)
/*
* descriptor tables
*/
-#ifdef CONFIG_X86_32
store_idt(&ctxt->idt);
-#else
-/* CONFIG_X86_64 */
- store_idt((struct desc_ptr *)&ctxt->idt_limit);
-#endif
+
/*
* We save it here, but restore it only in the hibernate case.
* For ACPI S3 resume, this is loaded via 'early_gdt_desc' in 64-bit
@@ -219,12 +215,7 @@ static void notrace __restore_processor_state(struct saved_context *ctxt)
* now restore the descriptor tables to their proper values
* ltr is done i fix_processor_context().
*/
-#ifdef CONFIG_X86_32
load_idt(&ctxt->idt);
-#else
-/* CONFIG_X86_64 */
- load_idt((const struct desc_ptr *)&ctxt->idt_limit);
-#endif
#ifdef CONFIG_X86_64
/*
--
2.13.6
next prev parent reply other threads:[~2017-12-14 21:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 21:19 [PATCH urgent 0/3] __restore_processor_state() fixes Andy Lutomirski
2017-12-14 21:19 ` Andy Lutomirski [this message]
2017-12-15 14:37 ` [tip:x86/urgent] x86/power/64: Use struct desc_ptr for the IDT in struct saved_context tip-bot for Andy Lutomirski
2017-12-14 21:19 ` [PATCH urgent 2/3] x86/power/32: Move SYSENTER MSR restoration to fix_processor_context() Andy Lutomirski
2017-12-15 14:38 ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2017-12-14 21:19 ` [PATCH urgent 3/3] x86/power: Make restore_processor_context() sane Andy Lutomirski
2017-12-14 22:32 ` Pavel Machek
2017-12-15 14:38 ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2017-12-15 1:28 ` [PATCH urgent 0/3] __restore_processor_state() fixes Rafael J. Wysocki
2017-12-15 1:35 ` Linus Torvalds
2017-12-15 11:21 ` Ingo Molnar
2017-12-15 9:18 ` Jarkko Nikula
2017-12-15 11:31 ` Ingo Molnar
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