- A fix for fanotify_mark() missing the conversion of x86_32 native

syscalls which take 64-bit arguments to the compat handlers due to
 former having a general compat handler. (Brian Gerst)
 
 - Add a forgotten pmd page destructor call to pud_free_pmd_page() where
 a pmd page is freed. (Dan Williams)
 
 - Make IN/OUT insns with an u8 immediate port operand handling for
 SEV-ES guests more precise by using only the single port byte and not
 the whole s32 value of the insn decoder. (Peter Gonda)
 
 - Correct a straddling end range check before returning the proper MTRR
 type, when the end address is the same as top of memory. (Ying-Tsun
 Huang)
 
 - Change PQR_ASSOC MSR update scheme when moving a task to a resctrl
 resource group to avoid significant performance overhead with some
 resctrl workloads. (Fenghua Yu)
 
 - Avoid the actual task move overhead when the task is already in the
 resource group. (Fenghua Yu)
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Merge tag 'x86_urgent_for_v5.11_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:
 "As expected, fixes started trickling in after the holidays so here is
  the accumulated pile of x86 fixes for 5.11:

   - A fix for fanotify_mark() missing the conversion of x86_32 native
     syscalls which take 64-bit arguments to the compat handlers due to
     former having a general compat handler. (Brian Gerst)

   - Add a forgotten pmd page destructor call to pud_free_pmd_page()
     where a pmd page is freed. (Dan Williams)

   - Make IN/OUT insns with an u8 immediate port operand handling for
     SEV-ES guests more precise by using only the single port byte and
     not the whole s32 value of the insn decoder. (Peter Gonda)

   - Correct a straddling end range check before returning the proper
     MTRR type, when the end address is the same as top of memory.
     (Ying-Tsun Huang)

   - Change PQR_ASSOC MSR update scheme when moving a task to a resctrl
     resource group to avoid significant performance overhead with some
     resctrl workloads. (Fenghua Yu)

   - Avoid the actual task move overhead when the task is already in the
     resource group. (Fenghua Yu)"

* tag 'x86_urgent_for_v5.11_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Don't move a task to the same resource group
  x86/resctrl: Use an IPI instead of task_work_add() to update PQR_ASSOC MSR
  x86/mtrr: Correct the range check before performing MTRR type lookups
  x86/sev-es: Fix SEV-ES OUT/IN immediate opcode vc handling
  x86/mm: Fix leak of pmd ptlock
  fanotify: Fix sys_fanotify_mark() on native x86-32

arch/Kconfig

@@ -1105,6 +1105,12 @@ config HAVE_ARCH_PFN_VALID
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	bool
 
+config ARCH_SPLIT_ARG64
+	bool
+	help
+	   If a 32-bit architecture requires 64-bit arguments to be split into
+	   pairs of 32-bit arguments, select this option.
+
 source "kernel/gcov/Kconfig"
 
 source "scripts/gcc-plugins/Kconfig"

arch/x86/Kconfig

@@ -19,6 +19,7 @@ config X86_32
 	select KMAP_LOCAL
 	select MODULES_USE_ELF_REL
 	select OLD_SIGACTION
+	select ARCH_SPLIT_ARG64
 
 config X86_64
 	def_bool y

arch/x86/kernel/cpu/mtrr/generic.c

@@ -167,9 +167,6 @@ static u8 mtrr_type_lookup_variable(u64 start, u64 end, u64 *partial_end,
 	*repeat = 0;
 	*uniform = 1;
 
-	/* Make end inclusive instead of exclusive */
-	end--;
-
 	prev_match = MTRR_TYPE_INVALID;
 	for (i = 0; i < num_var_ranges; ++i) {
 		unsigned short start_state, end_state, inclusive;
@@ -261,6 +258,9 @@ u8 mtrr_type_lookup(u64 start, u64 end, u8 *uniform)
 	int repeat;
 	u64 partial_end;
 
+	/* Make end inclusive instead of exclusive */
+	end--;
+
 	if (!mtrr_state_set)
 		return MTRR_TYPE_INVALID;
 

arch/x86/kernel/cpu/resctrl/rdtgroup.c

@@ -525,89 +525,70 @@ static void rdtgroup_remove(struct rdtgroup *rdtgrp)
 	kfree(rdtgrp);
 }
 
-struct task_move_callback {
+static void _update_task_closid_rmid(void *task)
-	struct callback_head	work;
-	struct rdtgroup		*rdtgrp;
-};
-
-static void move_myself(struct callback_head *head)
 {
-	struct task_move_callback *callback;
-	struct rdtgroup *rdtgrp;
-
-	callback = container_of(head, struct task_move_callback, work);
-	rdtgrp = callback->rdtgrp;
-
 	/*
-	 * If resource group was deleted before this task work callback
+	 * If the task is still current on this CPU, update PQR_ASSOC MSR.
-	 * was invoked, then assign the task to root group and free the
+	 * Otherwise, the MSR is updated when the task is scheduled in.
-	 * resource group.
 	 */
-	if (atomic_dec_and_test(&rdtgrp->waitcount) &&
+	if (task == current)
-	    (rdtgrp->flags & RDT_DELETED)) {
+		resctrl_sched_in();
-		current->closid = 0;
+}
-		current->rmid = 0;
-		rdtgroup_remove(rdtgrp);
-	}
 
-	if (unlikely(current->flags & PF_EXITING))
+static void update_task_closid_rmid(struct task_struct *t)
-		goto out;
+{
-
+	if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
-	preempt_disable();
+		smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
-	/* update PQR_ASSOC MSR to make resource group go into effect */
+	else
-	resctrl_sched_in();
+		_update_task_closid_rmid(t);
-	preempt_enable();
-
-out:
-	kfree(callback);
 }
 
 static int __rdtgroup_move_task(struct task_struct *tsk,
 				struct rdtgroup *rdtgrp)
 {
-	struct task_move_callback *callback;
+	/* If the task is already in rdtgrp, no need to move the task. */
-	int ret;
+	if ((rdtgrp->type == RDTCTRL_GROUP && tsk->closid == rdtgrp->closid &&
-
+	     tsk->rmid == rdtgrp->mon.rmid) ||
-	callback = kzalloc(sizeof(*callback), GFP_KERNEL);
+	    (rdtgrp->type == RDTMON_GROUP && tsk->rmid == rdtgrp->mon.rmid &&
-	if (!callback)
+	     tsk->closid == rdtgrp->mon.parent->closid))
-		return -ENOMEM;
+		return 0;
-	callback->work.func = move_myself;
-	callback->rdtgrp = rdtgrp;
 
 	/*
-	 * Take a refcount, so rdtgrp cannot be freed before the
+	 * Set the task's closid/rmid before the PQR_ASSOC MSR can be
-	 * callback has been invoked.
+	 * updated by them.
+	 *
+	 * For ctrl_mon groups, move both closid and rmid.
+	 * For monitor groups, can move the tasks only from
+	 * their parent CTRL group.
 	 */
-	atomic_inc(&rdtgrp->waitcount);
+
-	ret = task_work_add(tsk, &callback->work, TWA_RESUME);
+	if (rdtgrp->type == RDTCTRL_GROUP) {
-	if (ret) {
+		tsk->closid = rdtgrp->closid;
-		/*
+		tsk->rmid = rdtgrp->mon.rmid;
-		 * Task is exiting. Drop the refcount and free the callback.
+	} else if (rdtgrp->type == RDTMON_GROUP) {
-		 * No need to check the refcount as the group cannot be
+		if (rdtgrp->mon.parent->closid == tsk->closid) {
-		 * deleted before the write function unlocks rdtgroup_mutex.
-		 */
-		atomic_dec(&rdtgrp->waitcount);
-		kfree(callback);
-		rdt_last_cmd_puts("Task exited\n");
-	} else {
-		/*
-		 * For ctrl_mon groups move both closid and rmid.
-		 * For monitor groups, can move the tasks only from
-		 * their parent CTRL group.
-		 */
-		if (rdtgrp->type == RDTCTRL_GROUP) {
-			tsk->closid = rdtgrp->closid;
 			tsk->rmid = rdtgrp->mon.rmid;
-		} else if (rdtgrp->type == RDTMON_GROUP) {
+		} else {
-			if (rdtgrp->mon.parent->closid == tsk->closid) {
+			rdt_last_cmd_puts("Can't move task to different control group\n");
-				tsk->rmid = rdtgrp->mon.rmid;
+			return -EINVAL;
-			} else {
-				rdt_last_cmd_puts("Can't move task to different control group\n");
-				ret = -EINVAL;
-			}
 		}
 	}
-	return ret;
+
+	/*
+	 * Ensure the task's closid and rmid are written before determining if
+	 * the task is current that will decide if it will be interrupted.
+	 */
+	barrier();
+
+	/*
+	 * By now, the task's closid and rmid are set. If the task is current
+	 * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
+	 * group go into effect. If the task is not current, the MSR will be
+	 * updated when the task is scheduled in.
+	 */
+	update_task_closid_rmid(tsk);
+
+	return 0;
 }
 
 static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)

arch/x86/kernel/sev-es-shared.c

@@ -305,14 +305,14 @@ static enum es_result vc_ioio_exitinfo(struct es_em_ctxt *ctxt, u64 *exitinfo)
 	case 0xe4:
 	case 0xe5:
 		*exitinfo |= IOIO_TYPE_IN;
-		*exitinfo |= (u64)insn->immediate.value << 16;
+		*exitinfo |= (u8)insn->immediate.value << 16;
 		break;
 
 	/* OUT immediate opcodes */
 	case 0xe6:
 	case 0xe7:
 		*exitinfo |= IOIO_TYPE_OUT;
-		*exitinfo |= (u64)insn->immediate.value << 16;
+		*exitinfo |= (u8)insn->immediate.value << 16;
 		break;
 
 	/* IN register opcodes */

arch/x86/mm/pgtable.c

@@ -829,6 +829,8 @@ int pud_free_pmd_page(pud_t *pud, unsigned long addr)
 	}
 
 	free_page((unsigned long)pmd_sv);
+
+	pgtable_pmd_page_dtor(virt_to_page(pmd));
 	free_page((unsigned long)pmd);
 
 	return 1;

fs/notify/fanotify/fanotify_user.c

@@ -1285,26 +1285,23 @@ fput_and_out:
 	return ret;
 }
 
+#ifndef CONFIG_ARCH_SPLIT_ARG64
 SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags,
 			      __u64, mask, int, dfd,
 			      const char  __user *, pathname)
 {
 	return do_fanotify_mark(fanotify_fd, flags, mask, dfd, pathname);
 }
+#endif
 
-#ifdef CONFIG_COMPAT
+#if defined(CONFIG_ARCH_SPLIT_ARG64) || defined(CONFIG_COMPAT)
-COMPAT_SYSCALL_DEFINE6(fanotify_mark,
+SYSCALL32_DEFINE6(fanotify_mark,
 				int, fanotify_fd, unsigned int, flags,
-				__u32, mask0, __u32, mask1, int, dfd,
+				SC_ARG64(mask), int, dfd,
 				const char  __user *, pathname)
 {
-	return do_fanotify_mark(fanotify_fd, flags,
+	return do_fanotify_mark(fanotify_fd, flags, SC_VAL64(__u64, mask),
-#ifdef __BIG_ENDIAN
+				dfd, pathname);
-				((__u64)mask0 << 32) | mask1,
-#else
-				((__u64)mask1 << 32) | mask0,
-#endif
-				 dfd, pathname);
 }
 #endif
 

include/linux/syscalls.h

@@ -251,6 +251,30 @@ static inline int is_syscall_trace_event(struct trace_event_call *tp_event)
 	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
 #endif /* __SYSCALL_DEFINEx */
 
+/* For split 64-bit arguments on 32-bit architectures */
+#ifdef __LITTLE_ENDIAN
+#define SC_ARG64(name) u32, name##_lo, u32, name##_hi
+#else
+#define SC_ARG64(name) u32, name##_hi, u32, name##_lo
+#endif
+#define SC_VAL64(type, name) ((type) name##_hi << 32 | name##_lo)
+
+#ifdef CONFIG_COMPAT
+#define SYSCALL32_DEFINE1 COMPAT_SYSCALL_DEFINE1
+#define SYSCALL32_DEFINE2 COMPAT_SYSCALL_DEFINE2
+#define SYSCALL32_DEFINE3 COMPAT_SYSCALL_DEFINE3
+#define SYSCALL32_DEFINE4 COMPAT_SYSCALL_DEFINE4
+#define SYSCALL32_DEFINE5 COMPAT_SYSCALL_DEFINE5
+#define SYSCALL32_DEFINE6 COMPAT_SYSCALL_DEFINE6
+#else
+#define SYSCALL32_DEFINE1 SYSCALL_DEFINE1
+#define SYSCALL32_DEFINE2 SYSCALL_DEFINE2
+#define SYSCALL32_DEFINE3 SYSCALL_DEFINE3
+#define SYSCALL32_DEFINE4 SYSCALL_DEFINE4
+#define SYSCALL32_DEFINE5 SYSCALL_DEFINE5
+#define SYSCALL32_DEFINE6 SYSCALL_DEFINE6
+#endif
+
 /*
  * Called before coming back to user-mode. Returning to user-mode with an
  * address limit different than USER_DS can allow to overwrite kernel memory.