From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirsky <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@intel.com>,
Borislav Petkov <bpetkov@suse.de>,
Greg KH <gregkh@linuxfoundation.org>,
keescook@google.com, hughd@google.com,
Brian Gerst <brgerst@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Rik van Riel <riel@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
David Laight <David.Laight@aculab.com>,
Eduardo Valentin <eduval@amazon.com>,
aliguori@amazon.com, Will Deacon <will.deacon@arm.com>,
daniel.gruss@iaik.tugraz.at,
Dave Hansen <dave.hansen@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Borislav Petkov <bp@suse.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: [patch V149 09/50] x86/entry: Remove SYSENTER_stack naming
Date: Sat, 16 Dec 2017 22:24:03 +0100 [thread overview]
Message-ID: <20171216213137.138274042@linutronix.de> (raw)
In-Reply-To: <20171216212354.120930222@linutronix.de>
[-- Attachment #1: 0070-x86-entry-Remove-SYSENTER_stack-naming.patch --]
[-- Type: text/plain, Size: 10926 bytes --]
From: Dave Hansen <dave.hansen@linux.intel.com>
If the kernel oopses while on the trampoline stack, it will print
"<SYSENTER>" even if SYSENTER is not involved. That is rather confusing.
The "SYSENTER" stack is used for a lot more than SYSENTER now. Give it a
better string to display in stack dumps, and rename the kernel code to
match.
Also move the 32-bit code over to the new naming even though it still uses
the entry stack only for SYSENTER.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
---
arch/x86/entry/entry_32.S | 12 ++++++------
arch/x86/entry/entry_64.S | 4 ++--
arch/x86/include/asm/fixmap.h | 8 ++++----
arch/x86/include/asm/processor.h | 6 +++---
arch/x86/include/asm/stacktrace.h | 4 ++--
arch/x86/kernel/asm-offsets.c | 4 ++--
arch/x86/kernel/asm-offsets_32.c | 2 +-
arch/x86/kernel/cpu/common.c | 14 +++++++-------
arch/x86/kernel/dumpstack.c | 10 +++++-----
arch/x86/kernel/dumpstack_32.c | 6 +++---
arch/x86/kernel/dumpstack_64.c | 12 +++++++++---
11 files changed, 44 insertions(+), 38 deletions(-)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -942,9 +942,9 @@ ENTRY(debug)
/* Are we currently on the SYSENTER stack? */
movl PER_CPU_VAR(cpu_entry_area), %ecx
- addl $CPU_ENTRY_AREA_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx
- subl %eax, %ecx /* ecx = (end of SYSENTER_stack) - esp */
- cmpl $SIZEOF_SYSENTER_stack, %ecx
+ addl $CPU_ENTRY_AREA_entry_stack + SIZEOF_entry_stack, %ecx
+ subl %eax, %ecx /* ecx = (end of entry_stack) - esp */
+ cmpl $SIZEOF_entry_stack, %ecx
jb .Ldebug_from_sysenter_stack
TRACE_IRQS_OFF
@@ -986,9 +986,9 @@ ENTRY(nmi)
/* Are we currently on the SYSENTER stack? */
movl PER_CPU_VAR(cpu_entry_area), %ecx
- addl $CPU_ENTRY_AREA_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx
- subl %eax, %ecx /* ecx = (end of SYSENTER_stack) - esp */
- cmpl $SIZEOF_SYSENTER_stack, %ecx
+ addl $CPU_ENTRY_AREA_entry_stack + SIZEOF_entry_stack, %ecx
+ subl %eax, %ecx /* ecx = (end of entry_stack) - esp */
+ cmpl $SIZEOF_entry_stack, %ecx
jb .Lnmi_from_sysenter_stack
/* Not on SYSENTER stack. */
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -158,8 +158,8 @@ END(native_usergs_sysret64)
_entry_trampoline - CPU_ENTRY_AREA_entry_trampoline(%rip)
/* The top word of the SYSENTER stack is hot and is usable as scratch space. */
-#define RSP_SCRATCH CPU_ENTRY_AREA_SYSENTER_stack + \
- SIZEOF_SYSENTER_stack - 8 + CPU_ENTRY_AREA
+#define RSP_SCRATCH CPU_ENTRY_AREA_entry_stack + \
+ SIZEOF_entry_stack - 8 + CPU_ENTRY_AREA
ENTRY(entry_SYSCALL_64_trampoline)
UNWIND_HINT_EMPTY
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -56,10 +56,10 @@ struct cpu_entry_area {
char gdt[PAGE_SIZE];
/*
- * The GDT is just below SYSENTER_stack and thus serves (on x86_64) as
+ * The GDT is just below entry_stack and thus serves (on x86_64) as
* a a read-only guard page.
*/
- struct SYSENTER_stack_page SYSENTER_stack_page;
+ struct entry_stack_page entry_stack_page;
/*
* On x86_64, the TSS is mapped RO. On x86_32, it's mapped RW because
@@ -250,9 +250,9 @@ static inline struct cpu_entry_area *get
return (struct cpu_entry_area *)__fix_to_virt(__get_cpu_entry_area_page_index(cpu, 0));
}
-static inline struct SYSENTER_stack *cpu_SYSENTER_stack(int cpu)
+static inline struct entry_stack *cpu_entry_stack(int cpu)
{
- return &get_cpu_entry_area(cpu)->SYSENTER_stack_page.stack;
+ return &get_cpu_entry_area(cpu)->entry_stack_page.stack;
}
#endif /* !__ASSEMBLY__ */
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -337,12 +337,12 @@ struct x86_hw_tss {
#define IO_BITMAP_OFFSET (offsetof(struct tss_struct, io_bitmap) - offsetof(struct tss_struct, x86_tss))
#define INVALID_IO_BITMAP_OFFSET 0x8000
-struct SYSENTER_stack {
+struct entry_stack {
unsigned long words[64];
};
-struct SYSENTER_stack_page {
- struct SYSENTER_stack stack;
+struct entry_stack_page {
+ struct entry_stack stack;
} __aligned(PAGE_SIZE);
struct tss_struct {
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -16,7 +16,7 @@ enum stack_type {
STACK_TYPE_TASK,
STACK_TYPE_IRQ,
STACK_TYPE_SOFTIRQ,
- STACK_TYPE_SYSENTER,
+ STACK_TYPE_ENTRY,
STACK_TYPE_EXCEPTION,
STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
};
@@ -29,7 +29,7 @@ struct stack_info {
bool in_task_stack(unsigned long *stack, struct task_struct *task,
struct stack_info *info);
-bool in_sysenter_stack(unsigned long *stack, struct stack_info *info);
+bool in_entry_stack(unsigned long *stack, struct stack_info *info);
int get_stack_info(unsigned long *stack, struct task_struct *task,
struct stack_info *info, unsigned long *visit_mask);
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -97,6 +97,6 @@ void common(void) {
/* Layout info for cpu_entry_area */
OFFSET(CPU_ENTRY_AREA_tss, cpu_entry_area, tss);
OFFSET(CPU_ENTRY_AREA_entry_trampoline, cpu_entry_area, entry_trampoline);
- OFFSET(CPU_ENTRY_AREA_SYSENTER_stack, cpu_entry_area, SYSENTER_stack_page);
- DEFINE(SIZEOF_SYSENTER_stack, sizeof(struct SYSENTER_stack));
+ OFFSET(CPU_ENTRY_AREA_entry_stack, cpu_entry_area, entry_stack_page);
+ DEFINE(SIZEOF_entry_stack, sizeof(struct entry_stack));
}
--- a/arch/x86/kernel/asm-offsets_32.c
+++ b/arch/x86/kernel/asm-offsets_32.c
@@ -48,7 +48,7 @@ void foo(void)
/* Offset from the sysenter stack to tss.sp0 */
DEFINE(TSS_sysenter_sp0, offsetof(struct cpu_entry_area, tss.x86_tss.sp0) -
- offsetofend(struct cpu_entry_area, SYSENTER_stack_page.stack));
+ offsetofend(struct cpu_entry_area, entry_stack_page.stack));
#ifdef CONFIG_CC_STACKPROTECTOR
BLANK();
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -511,8 +511,8 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(char,
[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]);
#endif
-static DEFINE_PER_CPU_PAGE_ALIGNED(struct SYSENTER_stack_page,
- SYSENTER_stack_storage);
+static DEFINE_PER_CPU_PAGE_ALIGNED(struct entry_stack_page,
+ entry_stack_storage);
static void __init
set_percpu_fixmap_pages(int idx, void *ptr, int pages, pgprot_t prot)
@@ -547,8 +547,8 @@ static void __init setup_cpu_entry_area(
#endif
__set_fixmap(get_cpu_entry_area_index(cpu, gdt), get_cpu_gdt_paddr(cpu), gdt_prot);
- set_percpu_fixmap_pages(get_cpu_entry_area_index(cpu, SYSENTER_stack_page),
- per_cpu_ptr(&SYSENTER_stack_storage, cpu), 1,
+ set_percpu_fixmap_pages(get_cpu_entry_area_index(cpu, entry_stack_page),
+ per_cpu_ptr(&entry_stack_storage, cpu), 1,
PAGE_KERNEL);
/*
@@ -1348,7 +1348,7 @@ void enable_sep_cpu(void)
tss->x86_tss.ss1 = __KERNEL_CS;
wrmsr(MSR_IA32_SYSENTER_CS, tss->x86_tss.ss1, 0);
- wrmsr(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_SYSENTER_stack(cpu) + 1), 0);
+ wrmsr(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_entry_stack(cpu) + 1), 0);
wrmsr(MSR_IA32_SYSENTER_EIP, (unsigned long)entry_SYSENTER_32, 0);
put_cpu();
@@ -1465,7 +1465,7 @@ void syscall_init(void)
* AMD doesn't allow SYSENTER in long mode (either 32- or 64-bit).
*/
wrmsrl_safe(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS);
- wrmsrl_safe(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_SYSENTER_stack(cpu) + 1));
+ wrmsrl_safe(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_entry_stack(cpu) + 1));
wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)entry_SYSENTER_compat);
#else
wrmsrl(MSR_CSTAR, (unsigned long)ignore_sysret);
@@ -1680,7 +1680,7 @@ void cpu_init(void)
*/
set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss);
load_TR_desc();
- load_sp0((unsigned long)(cpu_SYSENTER_stack(cpu) + 1));
+ load_sp0((unsigned long)(cpu_entry_stack(cpu) + 1));
load_mm_ldt(&init_mm);
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -43,9 +43,9 @@ bool in_task_stack(unsigned long *stack,
return true;
}
-bool in_sysenter_stack(unsigned long *stack, struct stack_info *info)
+bool in_entry_stack(unsigned long *stack, struct stack_info *info)
{
- struct SYSENTER_stack *ss = cpu_SYSENTER_stack(smp_processor_id());
+ struct entry_stack *ss = cpu_entry_stack(smp_processor_id());
void *begin = ss;
void *end = ss + 1;
@@ -53,7 +53,7 @@ bool in_sysenter_stack(unsigned long *st
if ((void *)stack < begin || (void *)stack >= end)
return false;
- info->type = STACK_TYPE_SYSENTER;
+ info->type = STACK_TYPE_ENTRY;
info->begin = begin;
info->end = end;
info->next_sp = NULL;
@@ -111,13 +111,13 @@ void show_trace_log_lvl(struct task_stru
* - task stack
* - interrupt stack
* - HW exception stacks (double fault, nmi, debug, mce)
- * - SYSENTER stack
+ * - entry stack
*
* x86-32 can have up to four stacks:
* - task stack
* - softirq stack
* - hardirq stack
- * - SYSENTER stack
+ * - entry stack
*/
for (regs = NULL; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
const char *stack_name;
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -26,8 +26,8 @@ const char *stack_type_name(enum stack_t
if (type == STACK_TYPE_SOFTIRQ)
return "SOFTIRQ";
- if (type == STACK_TYPE_SYSENTER)
- return "SYSENTER";
+ if (type == STACK_TYPE_ENTRY)
+ return "ENTRY_TRAMPOLINE";
return NULL;
}
@@ -96,7 +96,7 @@ int get_stack_info(unsigned long *stack,
if (task != current)
goto unknown;
- if (in_sysenter_stack(stack, info))
+ if (in_entry_stack(stack, info))
goto recursion_check;
if (in_hardirq_stack(stack, info))
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -37,8 +37,14 @@ const char *stack_type_name(enum stack_t
if (type == STACK_TYPE_IRQ)
return "IRQ";
- if (type == STACK_TYPE_SYSENTER)
- return "SYSENTER";
+ if (type == STACK_TYPE_ENTRY) {
+ /*
+ * On 64-bit, we have a generic entry stack that we
+ * use for all the kernel entry points, including
+ * SYSENTER.
+ */
+ return "ENTRY_TRAMPOLINE";
+ }
if (type >= STACK_TYPE_EXCEPTION && type <= STACK_TYPE_EXCEPTION_LAST)
return exception_stack_names[type - STACK_TYPE_EXCEPTION];
@@ -118,7 +124,7 @@ int get_stack_info(unsigned long *stack,
if (in_irq_stack(stack, info))
goto recursion_check;
- if (in_sysenter_stack(stack, info))
+ if (in_entry_stack(stack, info))
goto recursion_check;
goto unknown;
next prev parent reply other threads:[~2017-12-16 21:47 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-16 21:23 [patch V149 00/50] x86/pti: Updated and reshuffled patch queue Thomas Gleixner
2017-12-16 21:23 ` [patch V149 01/50] x86/mm/dump_pagetables: Check PAGE_PRESENT for real Thomas Gleixner
2017-12-16 21:23 ` [patch V149 02/50] x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy Thomas Gleixner
2017-12-16 21:23 ` [patch V149 03/50] x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode Thomas Gleixner
2017-12-16 21:23 ` [patch V149 04/50] arch: Allow arch_dup_mmap() to fail Thomas Gleixner
2017-12-16 21:23 ` [patch V149 05/50] x86/ldt: Rework locking Thomas Gleixner
2017-12-16 21:24 ` [patch V149 06/50] x86/ldt: Prevent ldt inheritance on exec Thomas Gleixner
2017-12-16 21:24 ` [patch V149 07/50] x86/mm/64: Improve the memory map documentation Thomas Gleixner
2017-12-16 21:24 ` [patch V149 08/50] x86/doc: Remove obvious weirdness Thomas Gleixner
2017-12-16 21:24 ` Thomas Gleixner [this message]
2017-12-16 21:24 ` [patch V149 10/50] x86/uv: Use the right tlbflush API Thomas Gleixner
2017-12-16 21:24 ` [patch V149 11/50] x86/microcode: Dont abuse the tlbflush interface Thomas Gleixner
2017-12-16 21:24 ` [patch V149 12/50] x86/mm: Use __flush_tlb_one() for kernel memory Thomas Gleixner
2017-12-16 21:24 ` [patch V149 13/50] x86/mm: Remove superfluous barriers Thomas Gleixner
2017-12-16 21:24 ` [patch V149 14/50] x86/mm: Clarify which functions are supposed to flush what Thomas Gleixner
2017-12-16 21:24 ` [patch V149 15/50] x86/mm: Move the CR3 construction functions to tlbflush.h Thomas Gleixner
2017-12-16 21:24 ` [patch V149 16/50] x86/mm: Remove hard-coded ASID limit checks Thomas Gleixner
2017-12-16 21:24 ` [patch V149 17/50] x86/mm: Put MMU to hardware ASID translation in one place Thomas Gleixner
2017-12-16 21:24 ` [patch V149 18/50] x86/mm: Create asm/invpcid.h Thomas Gleixner
2017-12-16 21:24 ` [patch V149 19/50] x86/cpufeatures: Add X86_BUG_CPU_INSECURE Thomas Gleixner
2017-12-16 21:24 ` [patch V149 20/50] x86/mm/pti: Disable global pages if PAGE_TABLE_ISOLATION=y Thomas Gleixner
2017-12-16 21:24 ` [patch V149 21/50] x86/mm/pti: Prepare the x86/entry assembly code for entry/exit CR3 switching Thomas Gleixner
2017-12-16 21:24 ` [patch V149 22/50] x86/mm/pti: Add infrastructure for page table isolation Thomas Gleixner
2017-12-16 21:24 ` [patch V149 23/50] x86/mm/pti: Add mapping helper functions Thomas Gleixner
2017-12-16 21:24 ` [patch V149 24/50] x86/mm/pti: Allow NX poison to be set in p4d/pgd Thomas Gleixner
2017-12-16 21:24 ` [patch V149 25/50] x86/mm/pti: Allocate a separate user PGD Thomas Gleixner
2017-12-16 21:24 ` [patch V149 26/50] x86/mm/pti: Populate " Thomas Gleixner
2017-12-16 21:24 ` [patch V149 27/50] x86/mm/pti: Add functions to clone kernel PMDs Thomas Gleixner
2017-12-16 21:24 ` [patch V149 28/50] x86/mm/pti: Force entry through trampoline when PTI active Thomas Gleixner
2017-12-16 21:24 ` [patch V149 29/50] x86/fixmap: Move the CPU entry area into a separate PMD Thomas Gleixner
2017-12-16 21:24 ` [patch V149 30/50] x86/mm/pti: Share cpu_entry_area PMDs Thomas Gleixner
2017-12-16 21:24 ` [patch V149 31/50] x86/entry: Align entry text section to PMD boundary Thomas Gleixner
2017-12-16 21:24 ` [patch V149 32/50] x86/mm/pti: Share entry text PMD Thomas Gleixner
2017-12-16 21:24 ` [patch V149 33/50] x86/mm/pti: Map ESPFIX into user space Thomas Gleixner
2017-12-16 21:24 ` [patch V149 34/50] x86/fixmap: Move IDT fixmap into the cpu_entry_area range Thomas Gleixner
2017-12-16 21:24 ` [patch V149 35/50] x86/fixmap: Add debugstore entries to cpu_entry_area Thomas Gleixner
2017-12-16 21:24 ` [patch V149 36/50] x86/events/intel/ds: Map debug buffers in fixmap Thomas Gleixner
2017-12-16 21:24 ` [patch V149 37/50] x86/mm/64: Make a full PGD-entry size hole in the memory map Thomas Gleixner
2017-12-17 11:07 ` Kirill A. Shutemov
2017-12-16 21:24 ` [patch V149 38/50] x86/pti: Put the LDT in its own PGD if PTI is on Thomas Gleixner
2017-12-17 11:09 ` Kirill A. Shutemov
2017-12-16 21:24 ` [patch V149 39/50] x86/pti: Map the vsyscall page if needed Thomas Gleixner
2017-12-16 21:24 ` [patch V149 40/50] x86/mm: Allow flushing for future ASID switches Thomas Gleixner
2017-12-16 21:24 ` [patch V149 41/50] x86/mm: Abstract switching CR3 Thomas Gleixner
2017-12-16 21:24 ` [patch V149 42/50] x86/mm: Use/Fix PCID to optimize user/kernel switches Thomas Gleixner
2017-12-16 21:24 ` [patch V149 43/50] x86/mm: Optimize RESTORE_CR3 Thomas Gleixner
2017-12-16 21:24 ` [patch V149 44/50] x86/mm: Use INVPCID for __native_flush_tlb_single() Thomas Gleixner
2017-12-16 21:24 ` [patch V149 45/50] x86/mm: Clarify the whole ASID/kernel PCID/user PCID naming Thomas Gleixner
2017-12-16 21:24 ` [patch V149 46/50] x86/mm/pti: Add Kconfig Thomas Gleixner
2017-12-16 21:24 ` [patch V149 47/50] x86/mm/dump_pagetables: Add page table directory Thomas Gleixner
2017-12-16 21:24 ` [patch V149 48/50] x86/mm/dump_pagetables: Check user space page table for WX pages Thomas Gleixner
2017-12-16 21:24 ` [patch V149 49/50] x86/mm/dump_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-12-16 21:24 ` [patch V149 50/50] x86/ldt: Make the LDT mapping RO Thomas Gleixner
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