Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
"The accumulated fixes from this and last week:
- Fix vmalloc TLB flush and map range calculations which lead to
stale TLBs, spurious faults and other hard to diagnose issues.
- Use fault_in_pages_writable() for prefaulting the user stack in the
FPU code as it's less fragile than the current solution
- Use the PF_KTHREAD flag when checking for a kernel thread instead
of current->mm as the latter can give the wrong answer due to
use_mm()
- Compute the vmemmap size correctly for KASLR and 5-Level paging.
Otherwise this can end up with a way too small vmemmap area.
- Make KASAN and 5-level paging work again by making sure that all
invalid bits are masked out when computing the P4D offset. This
worked before but got broken recently when the LDT remap area was
moved.
- Prevent a NULL pointer dereference in the resource control code
which can be triggered with certain mount options when the
requested resource is not available.
- Enforce ordering of microcode loading vs. perf initialization on
secondary CPUs. Otherwise perf tries to access a non-existing MSR
as the boot CPU marked it as available.
- Don't stop the resource control group walk early otherwise the
control bitmaps are not updated correctly and become inconsistent.
- Unbreak kgdb by returning 0 on success from
kgdb_arch_set_breakpoint() instead of an error code.
- Add more Icelake CPU model defines so depending changes can be
queued in other trees"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode, cpuhotplug: Add a microcode loader CPU hotplug callback
x86/kasan: Fix boot with 5-level paging and KASAN
x86/fpu: Don't use current->mm to check for a kthread
x86/kgdb: Return 0 from kgdb_arch_set_breakpoint()
x86/resctrl: Prevent NULL pointer dereference when local MBM is disabled
x86/resctrl: Don't stop walking closids when a locksetup group is found
x86/fpu: Update kernel's FPU state before using for the fsave header
x86/mm/KASLR: Compute the size of the vmemmap section properly
x86/fpu: Use fault_in_pages_writeable() for pre-faulting
x86/CPU: Add more Icelake model numbers
mm/vmalloc: Avoid rare case of flushing TLB with weird arguments
mm/vmalloc: Fix calculation of direct map addr range
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 9e27fa0..4c95c36 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -536,7 +536,7 @@
struct fpu *fpu = ¤t->thread.fpu;
int cpu = smp_processor_id();
- if (WARN_ON_ONCE(current->mm == NULL))
+ if (WARN_ON_ONCE(current->flags & PF_KTHREAD))
return;
if (!fpregs_state_valid(fpu, cpu)) {
@@ -567,11 +567,11 @@
* otherwise.
*
* The FPU context is only stored/restored for a user task and
- * ->mm is used to distinguish between kernel and user threads.
+ * PF_KTHREAD is used to distinguish between kernel and user threads.
*/
static inline void switch_fpu_prepare(struct fpu *old_fpu, int cpu)
{
- if (static_cpu_has(X86_FEATURE_FPU) && current->mm) {
+ if (static_cpu_has(X86_FEATURE_FPU) && !(current->flags & PF_KTHREAD)) {
if (!copy_fpregs_to_fpstate(old_fpu))
old_fpu->last_cpu = -1;
else
diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
index 9f15384..3101188 100644
--- a/arch/x86/include/asm/intel-family.h
+++ b/arch/x86/include/asm/intel-family.h
@@ -52,6 +52,9 @@
#define INTEL_FAM6_CANNONLAKE_MOBILE 0x66
+#define INTEL_FAM6_ICELAKE_X 0x6A
+#define INTEL_FAM6_ICELAKE_XEON_D 0x6C
+#define INTEL_FAM6_ICELAKE_DESKTOP 0x7D
#define INTEL_FAM6_ICELAKE_MOBILE 0x7E
/* "Small Core" Processors (Atom) */
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 70a0443..a813987 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -872,7 +872,7 @@
goto out_ucode_group;
register_syscore_ops(&mc_syscore_ops);
- cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/microcode:online",
+ cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:online",
mc_cpu_online, mc_cpu_down_prep);
pr_info("Microcode Update Driver: v%s.", DRIVER_VERSION);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 7ee9312..397206f 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -360,6 +360,9 @@
struct list_head *head;
struct rdtgroup *entry;
+ if (!is_mbm_local_enabled())
+ return;
+
r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
closid = rgrp->closid;
rmid = rgrp->mon.rmid;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2f48f208..2131b8b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2534,7 +2534,12 @@
if (closid_allocated(i) && i != closid) {
mode = rdtgroup_mode_by_closid(i);
if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
- break;
+ /*
+ * ctrl values for locksetup aren't relevant
+ * until the schemata is written, and the mode
+ * becomes RDT_MODE_PSEUDO_LOCKED.
+ */
+ continue;
/*
* If CDP is active include peer domain's
* usage to ensure there is no overlap
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 466fca6..649fbc3 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -102,7 +102,7 @@
kernel_fpu_disable();
- if (current->mm) {
+ if (!(current->flags & PF_KTHREAD)) {
if (!test_thread_flag(TIF_NEED_FPU_LOAD)) {
set_thread_flag(TIF_NEED_FPU_LOAD);
/*
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 5a8d118..0071b79 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -5,6 +5,7 @@
#include <linux/compat.h>
#include <linux/cpu.h>
+#include <linux/pagemap.h>
#include <asm/fpu/internal.h>
#include <asm/fpu/signal.h>
@@ -61,6 +62,11 @@
struct user_i387_ia32_struct env;
struct _fpstate_32 __user *fp = buf;
+ fpregs_lock();
+ if (!test_thread_flag(TIF_NEED_FPU_LOAD))
+ copy_fxregs_to_kernel(&tsk->thread.fpu);
+ fpregs_unlock();
+
convert_from_fxsr(&env, tsk);
if (__copy_to_user(buf, &env, sizeof(env)) ||
@@ -189,15 +195,7 @@
fpregs_unlock();
if (ret) {
- int aligned_size;
- int nr_pages;
-
- aligned_size = offset_in_page(buf_fx) + fpu_user_xstate_size;
- nr_pages = DIV_ROUND_UP(aligned_size, PAGE_SIZE);
-
- ret = get_user_pages_unlocked((unsigned long)buf_fx, nr_pages,
- NULL, FOLL_WRITE);
- if (ret == nr_pages)
+ if (!fault_in_pages_writeable(buf_fx, fpu_user_xstate_size))
goto retry;
return -EFAULT;
}
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index 9a8c164..6690c56 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -758,7 +758,7 @@
BREAK_INSTR_SIZE);
bpt->type = BP_POKE_BREAKPOINT;
- return err;
+ return 0;
}
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 8dc0fc0..296da58 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -199,7 +199,7 @@
if (!pgtable_l5_enabled())
return (p4d_t *)pgd;
- p4d = __pa_nodebug(pgd_val(*pgd)) & PTE_PFN_MASK;
+ p4d = pgd_val(*pgd) & PTE_PFN_MASK;
p4d += __START_KERNEL_map - phys_base;
return (p4d_t *)p4d + p4d_index(addr);
}
diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c
index dc3f058..dc6182e 100644
--- a/arch/x86/mm/kaslr.c
+++ b/arch/x86/mm/kaslr.c
@@ -52,7 +52,7 @@
} kaslr_regions[] = {
{ &page_offset_base, 0 },
{ &vmalloc_base, 0 },
- { &vmemmap_base, 1 },
+ { &vmemmap_base, 0 },
};
/* Get size in bytes used by the memory region */
@@ -78,6 +78,7 @@
unsigned long rand, memory_tb;
struct rnd_state rand_state;
unsigned long remain_entropy;
+ unsigned long vmemmap_size;
vaddr_start = pgtable_l5_enabled() ? __PAGE_OFFSET_BASE_L5 : __PAGE_OFFSET_BASE_L4;
vaddr = vaddr_start;
@@ -109,6 +110,14 @@
if (memory_tb < kaslr_regions[0].size_tb)
kaslr_regions[0].size_tb = memory_tb;
+ /*
+ * Calculate the vmemmap region size in TBs, aligned to a TB
+ * boundary.
+ */
+ vmemmap_size = (kaslr_regions[0].size_tb << (TB_SHIFT - PAGE_SHIFT)) *
+ sizeof(struct page);
+ kaslr_regions[2].size_tb = DIV_ROUND_UP(vmemmap_size, 1UL << TB_SHIFT);
+
/* Calculate entropy available between regions */
remain_entropy = vaddr_end - vaddr_start;
for (i = 0; i < ARRAY_SIZE(kaslr_regions); i++)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 6a38159..5c60622 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -101,6 +101,7 @@
CPUHP_AP_IRQ_BCM2836_STARTING,
CPUHP_AP_IRQ_MIPS_GIC_STARTING,
CPUHP_AP_ARM_MVEBU_COHERENCY,
+ CPUHP_AP_MICROCODE_LOADER,
CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
CPUHP_AP_PERF_X86_STARTING,
CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7350a12..4c9e150 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2123,9 +2123,9 @@
/* Handle removing and resetting vm mappings related to the vm_struct. */
static void vm_remove_mappings(struct vm_struct *area, int deallocate_pages)
{
- unsigned long addr = (unsigned long)area->addr;
unsigned long start = ULONG_MAX, end = 0;
int flush_reset = area->flags & VM_FLUSH_RESET_PERMS;
+ int flush_dmap = 0;
int i;
/*
@@ -2135,8 +2135,8 @@
* execute permissions, without leaving a RW+X window.
*/
if (flush_reset && !IS_ENABLED(CONFIG_ARCH_HAS_SET_DIRECT_MAP)) {
- set_memory_nx(addr, area->nr_pages);
- set_memory_rw(addr, area->nr_pages);
+ set_memory_nx((unsigned long)area->addr, area->nr_pages);
+ set_memory_rw((unsigned long)area->addr, area->nr_pages);
}
remove_vm_area(area->addr);
@@ -2160,9 +2160,11 @@
* the vm_unmap_aliases() flush includes the direct map.
*/
for (i = 0; i < area->nr_pages; i++) {
- if (page_address(area->pages[i])) {
+ unsigned long addr = (unsigned long)page_address(area->pages[i]);
+ if (addr) {
start = min(addr, start);
- end = max(addr, end);
+ end = max(addr + PAGE_SIZE, end);
+ flush_dmap = 1;
}
}
@@ -2172,7 +2174,7 @@
* reset the direct map permissions to the default.
*/
set_area_direct_map(area, set_direct_map_invalid_noflush);
- _vm_unmap_aliases(start, end, 1);
+ _vm_unmap_aliases(start, end, flush_dmap);
set_area_direct_map(area, set_direct_map_default_noflush);
}
