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Code Issues Releases Wiki Activity

- Fix the MSI message data struct definition 

- Use local labels in the exception table macros to avoid symbol
 conflicts with clang LTO builds
 
 - A couple of fixes to objtool checking of the relatively newly added
 SLS and IBT code
 
 - Rename a local var in the WARN* macro machinery to prevent shadowing
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Merge tag 'x86_urgent_for_v5.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Fix the MSI message data struct definition

 - Use local labels in the exception table macros to avoid symbol
   conflicts with clang LTO builds

 - A couple of fixes to objtool checking of the relatively newly added
   SLS and IBT code

 - Rename a local var in the WARN* macro machinery to prevent shadowing

* tag 'x86_urgent_for_v5.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/msi: Fix msi message data shadow struct
  x86/extable: Prefer local labels in .set directives
  x86,bpf: Avoid IBT objtool warning
  objtool: Fix SLS validation for kcov tail-call replacement
  objtool: Fix IBT tail-call detection
  x86/bug: Prevent shadowing in __WARN_FLAGS
  x86/mm/tlb: Revert retpoline avoidance approach
This commit is contained in:
Linus Torvalds 2022-04-10 07:12:27 -10:00
parent b51f86e990 59b18a1e65
commit 9c6913b749
6 changed files with 54 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/x86/include/asm/asm.h
View File

@ -154,24 +154,24 @@
# define DEFINE_EXTABLE_TYPE_REG \
".macro extable_type_reg type:req reg:req\n" \
".set found, 0\n" \
".set regnr, 0\n" \
".set .Lfound, 0\n" \
".set .Lregnr, 0\n" \
".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
".ifc \\reg, %%\\rs\n" \
".set found, found+1\n" \
".long \\type + (regnr << 8)\n" \
".set .Lfound, .Lfound+1\n" \
".long \\type + (.Lregnr << 8)\n" \
".endif\n" \
".set regnr, regnr+1\n" \
".set .Lregnr, .Lregnr+1\n" \
".endr\n" \
".set regnr, 0\n" \
".set .Lregnr, 0\n" \
".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
".ifc \\reg, %%\\rs\n" \
".set found, found+1\n" \
".long \\type + (regnr << 8)\n" \
".set .Lfound, .Lfound+1\n" \
".long \\type + (.Lregnr << 8)\n" \
".endif\n" \
".set regnr, regnr+1\n" \
".set .Lregnr, .Lregnr+1\n" \
".endr\n" \
".if (found != 1)\n" \
".if (.Lfound != 1)\n" \
".error \"extable_type_reg: bad register argument\"\n" \
".endif\n" \
".endm\n"

4
arch/x86/include/asm/bug.h
View File

@ -78,9 +78,9 @@ do { \
*/
#define __WARN_FLAGS(flags) \
do { \
__auto_type f = BUGFLAG_WARNING|(flags); \
__auto_type __flags = BUGFLAG_WARNING|(flags); \
instrumentation_begin(); \
_BUG_FLAGS(ASM_UD2, f, ASM_REACHABLE); \
_BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \
instrumentation_end(); \
} while (0)

19
arch/x86/include/asm/msi.h
View File

@ -12,14 +12,17 @@ int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
/* Structs and defines for the X86 specific MSI message format */
typedef struct x86_msi_data {
u32 vector : 8,
delivery_mode : 3,
dest_mode_logical : 1,
reserved : 2,
active_low : 1,
is_level : 1;
u32 dmar_subhandle;
union {
struct {
u32 vector : 8,
delivery_mode : 3,
dest_mode_logical : 1,
reserved : 2,
active_low : 1,
is_level : 1;
};
u32 dmar_subhandle;
};
} __attribute__ ((packed)) arch_msi_msg_data_t;
#define arch_msi_msg_data x86_msi_data

37
arch/x86/mm/tlb.c
View File

@ -855,13 +855,11 @@ done:
nr_invalidate);
}
static bool tlb_is_not_lazy(int cpu)
static bool tlb_is_not_lazy(int cpu, void *data)
{
return !per_cpu(cpu_tlbstate_shared.is_lazy, cpu);
}
static DEFINE_PER_CPU(cpumask_t, flush_tlb_mask);
DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state_shared, cpu_tlbstate_shared);
EXPORT_PER_CPU_SYMBOL(cpu_tlbstate_shared);
@ -890,36 +888,11 @@ STATIC_NOPV void native_flush_tlb_multi(const struct cpumask *cpumask,
* up on the new contents of what used to be page tables, while
* doing a speculative memory access.
*/
if (info->freed_tables) {
if (info->freed_tables)
on_each_cpu_mask(cpumask, flush_tlb_func, (void *)info, true);
} else {
/*
* Although we could have used on_each_cpu_cond_mask(),
* open-coding it has performance advantages, as it eliminates
* the need for indirect calls or retpolines. In addition, it
* allows to use a designated cpumask for evaluating the
* condition, instead of allocating one.
*
* This code works under the assumption that there are no nested
* TLB flushes, an assumption that is already made in
* flush_tlb_mm_range().
*
* cond_cpumask is logically a stack-local variable, but it is
* more efficient to have it off the stack and not to allocate
* it on demand. Preemption is disabled and this code is
* non-reentrant.
*/
struct cpumask *cond_cpumask = this_cpu_ptr(&flush_tlb_mask);
int cpu;
cpumask_clear(cond_cpumask);
for_each_cpu(cpu, cpumask) {
if (tlb_is_not_lazy(cpu))
__cpumask_set_cpu(cpu, cond_cpumask);
}
on_each_cpu_mask(cond_cpumask, flush_tlb_func, (void *)info, true);
}
else
on_each_cpu_cond_mask(tlb_is_not_lazy, flush_tlb_func,
(void *)info, 1, cpumask);
}
void flush_tlb_multi(const struct cpumask *cpumask,

1
arch/x86/net/bpf_jit_comp.c
View File

@ -412,6 +412,7 @@ static void emit_indirect_jump(u8 **pprog, int reg, u8 *ip)
EMIT_LFENCE();
EMIT2(0xFF, 0xE0 + reg);
} else if (cpu_feature_enabled(X86_FEATURE_RETPOLINE)) {
OPTIMIZER_HIDE_VAR(reg);
emit_jump(&prog, &__x86_indirect_thunk_array[reg], ip);
} else
#endif

30
tools/objtool/check.c
View File

@ -1155,6 +1155,17 @@ static void annotate_call_site(struct objtool_file *file,
: arch_nop_insn(insn->len));
insn->type = sibling ? INSN_RETURN : INSN_NOP;
if (sibling) {
/*
* We've replaced the tail-call JMP insn by two new
* insn: RET; INT3, except we only have a single struct
* insn here. Mark it retpoline_safe to avoid the SLS
* warning, instead of adding another insn.
*/
insn->retpoline_safe = true;
}
return;
}
@ -1239,11 +1250,20 @@ static bool same_function(struct instruction *insn1, struct instruction *insn2)
return insn1->func->pfunc == insn2->func->pfunc;
}
static bool is_first_func_insn(struct instruction *insn)
static bool is_first_func_insn(struct objtool_file *file, struct instruction *insn)
{
return insn->offset == insn->func->offset ||
(insn->type == INSN_ENDBR &&
insn->offset == insn->func->offset + insn->len);
if (insn->offset == insn->func->offset)
return true;
if (ibt) {
struct instruction *prev = prev_insn_same_sym(file, insn);
if (prev && prev->type == INSN_ENDBR &&
insn->offset == insn->func->offset + prev->len)
return true;
}
return false;
}
/*
@ -1327,7 +1347,7 @@ static int add_jump_destinations(struct objtool_file *file)
insn->jump_dest->func->pfunc = insn->func;
} else if (!same_function(insn, insn->jump_dest) &&
is_first_func_insn(insn->jump_dest)) {
is_first_func_insn(file, insn->jump_dest)) {
/* internal sibling call (without reloc) */
add_call_dest(file, insn, insn->jump_dest->func, true);
}