Merge remote-tracking branch 'stable/linux-6.6.y' into rpi-6.6.y

Author: popcornmix

Documentation/power/runtime_pm.rst

@@ -347,7 +347,9 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
 
   `int pm_runtime_resume_and_get(struct device *dev);`
     - run pm_runtime_resume(dev) and if successful, increment the device's
-      usage counter; return the result of pm_runtime_resume
+      usage counter; returns 0 on success (whether or not the device's
+      runtime PM status was already 'active') or the error code from
+      pm_runtime_resume() on failure.
 
   `int pm_request_idle(struct device *dev);`
     - submit a request to execute the subsystem-level idle callback for the

Makefile

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 VERSION = 6
 PATCHLEVEL = 6
-SUBLEVEL = 66
+SUBLEVEL = 67
 EXTRAVERSION =
 NAME = Pinguïn Aangedreven
 

arch/arm64/kvm/sys_regs.c

@@ -1330,6 +1330,7 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 			val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE);
 
 		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME);
+		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MPAM_frac);
 		break;
 	case SYS_ID_AA64ISAR1_EL1:
 		if (!vcpu_has_ptrauth(vcpu))
@@ -1472,6 +1473,13 @@ static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
 
 	val &= ~ID_AA64PFR0_EL1_AMU_MASK;
 
+	/*
+	 * MPAM is disabled by default as KVM also needs a set of PARTID to
+	 * program the MPAMVPMx_EL2 PARTID remapping registers with. But some
+	 * older kernels let the guest see the ID bit.
+	 */
+	val &= ~ID_AA64PFR0_EL1_MPAM_MASK;
+
 	return val;
 }
 
@@ -1560,6 +1568,42 @@ static int set_id_dfr0_el1(struct kvm_vcpu *vcpu,
 	return set_id_reg(vcpu, rd, val);
 }
 
+static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
+			       const struct sys_reg_desc *rd, u64 user_val)
+{
+	u64 hw_val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
+	u64 mpam_mask = ID_AA64PFR0_EL1_MPAM_MASK;
+
+	/*
+	 * Commit 011e5f5bf529f ("arm64/cpufeature: Add remaining feature bits
+	 * in ID_AA64PFR0 register") exposed the MPAM field of AA64PFR0_EL1 to
+	 * guests, but didn't add trap handling. KVM doesn't support MPAM and
+	 * always returns an UNDEF for these registers. The guest must see 0
+	 * for this field.
+	 *
+	 * But KVM must also accept values from user-space that were provided
+	 * by KVM. On CPUs that support MPAM, permit user-space to write
+	 * the sanitizied value to ID_AA64PFR0_EL1.MPAM, but ignore this field.
+	 */
+	if ((hw_val & mpam_mask) == (user_val & mpam_mask))
+		user_val &= ~ID_AA64PFR0_EL1_MPAM_MASK;
+
+	return set_id_reg(vcpu, rd, user_val);
+}
+
+static int set_id_aa64pfr1_el1(struct kvm_vcpu *vcpu,
+			       const struct sys_reg_desc *rd, u64 user_val)
+{
+	u64 hw_val = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1);
+	u64 mpam_mask = ID_AA64PFR1_EL1_MPAM_frac_MASK;
+
+	/* See set_id_aa64pfr0_el1 for comment about MPAM */
+	if ((hw_val & mpam_mask) == (user_val & mpam_mask))
+		user_val &= ~ID_AA64PFR1_EL1_MPAM_frac_MASK;
+
+	return set_id_reg(vcpu, rd, user_val);
+}
+
 /*
  * cpufeature ID register user accessors
  *
@@ -2018,10 +2062,14 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_ID_AA64PFR0_EL1),
 	  .access = access_id_reg,
 	  .get_user = get_id_reg,
-	  .set_user = set_id_reg,
+	  .set_user = set_id_aa64pfr0_el1,
 	  .reset = read_sanitised_id_aa64pfr0_el1,
 	  .val = ID_AA64PFR0_EL1_CSV2_MASK | ID_AA64PFR0_EL1_CSV3_MASK, },
-	ID_SANITISED(ID_AA64PFR1_EL1),
+	{ SYS_DESC(SYS_ID_AA64PFR1_EL1),
+	  .access = access_id_reg,
+	  .get_user = get_id_reg,
+	  .set_user = set_id_aa64pfr1_el1,
+	  .reset = kvm_read_sanitised_id_reg, },
 	ID_UNALLOCATED(4,2),
 	ID_UNALLOCATED(4,3),
 	ID_SANITISED(ID_AA64ZFR0_EL1),

arch/riscv/include/asm/kfence.h

@@ -22,7 +22,9 @@ static inline bool kfence_protect_page(unsigned long addr, bool protect)
 	else
 		set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT));
 
-	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+	preempt_disable();
+	local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+	preempt_enable();
 
 	return true;
 }

arch/riscv/kernel/setup.c

@@ -246,7 +246,7 @@ static void __init init_resources(void)
 static void __init parse_dtb(void)
 {
 	/* Early scan of device tree from init memory */
-	if (early_init_dt_scan(dtb_early_va, __pa(dtb_early_va))) {
+	if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
 		const char *name = of_flat_dt_get_machine_name();
 
 		if (name) {

arch/x86/events/intel/ds.c

@@ -1354,7 +1354,7 @@ void intel_pmu_pebs_enable(struct perf_event *event)
 			 * hence we need to drain when changing said
 			 * size.
 			 */
-			intel_pmu_drain_large_pebs(cpuc);
+			intel_pmu_drain_pebs_buffer();
 			adaptive_pebs_record_size_update();
 			wrmsrl(MSR_PEBS_DATA_CFG, pebs_data_cfg);
 			cpuc->active_pebs_data_cfg = pebs_data_cfg;

arch/x86/include/asm/processor.h

@@ -190,6 +190,8 @@ static inline unsigned long long l1tf_pfn_limit(void)
 	return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
 }
 
+void init_cpu_devs(void);
+void get_cpu_vendor(struct cpuinfo_x86 *c);
 extern void early_cpu_init(void);
 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 extern void print_cpu_info(struct cpuinfo_x86 *);

arch/x86/include/asm/static_call.h

@@ -65,4 +65,19 @@
 
 extern bool __static_call_fixup(void *tramp, u8 op, void *dest);
 
+extern void __static_call_update_early(void *tramp, void *func);
+
+#define static_call_update_early(name, _func)				\
+({									\
+	typeof(&STATIC_CALL_TRAMP(name)) __F = (_func);			\
+	if (static_call_initialized) {					\
+		__static_call_update(&STATIC_CALL_KEY(name),		\
+				     STATIC_CALL_TRAMP_ADDR(name), __F);\
+	} else {							\
+		WRITE_ONCE(STATIC_CALL_KEY(name).func, _func);		\
+		__static_call_update_early(STATIC_CALL_TRAMP_ADDR(name),\
+					   __F);			\
+	}								\
+})
+
 #endif /* _ASM_STATIC_CALL_H */

arch/x86/include/asm/sync_core.h

@@ -8,7 +8,7 @@
 #include <asm/special_insns.h>
 
 #ifdef CONFIG_X86_32
-static inline void iret_to_self(void)
+static __always_inline void iret_to_self(void)
 {
 	asm volatile (
 		"pushfl\n\t"
@@ -19,7 +19,7 @@ static inline void iret_to_self(void)
 		: ASM_CALL_CONSTRAINT : : "memory");
 }
 #else
-static inline void iret_to_self(void)
+static __always_inline void iret_to_self(void)
 {
 	unsigned int tmp;
 
@@ -55,7 +55,7 @@ static inline void iret_to_self(void)
  * Like all of Linux's memory ordering operations, this is a
  * compiler barrier as well.
  */
-static inline void sync_core(void)
+static __always_inline void sync_core(void)
 {
 	/*
 	 * The SERIALIZE instruction is the most straightforward way to

arch/x86/include/asm/xen/hypercall.h

@@ -39,9 +39,11 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/pgtable.h>
+#include <linux/instrumentation.h>
 
 #include <trace/events/xen.h>
 
+#include <asm/alternative.h>
 #include <asm/page.h>
 #include <asm/smap.h>
 #include <asm/nospec-branch.h>
@@ -86,11 +88,20 @@ struct xen_dm_op_buf;
  * there aren't more than 5 arguments...)
  */
 
-extern struct { char _entry[32]; } hypercall_page[];
+void xen_hypercall_func(void);
+DECLARE_STATIC_CALL(xen_hypercall, xen_hypercall_func);
 
-#define __HYPERCALL		"call hypercall_page+%c[offset]"
-#define __HYPERCALL_ENTRY(x)						\
-	[offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
+#ifdef MODULE
+#define __ADDRESSABLE_xen_hypercall
+#else
+#define __ADDRESSABLE_xen_hypercall __ADDRESSABLE_ASM_STR(__SCK__xen_hypercall)
+#endif
+
+#define __HYPERCALL					\
+	__ADDRESSABLE_xen_hypercall			\
+	"call __SCT__xen_hypercall"
+
+#define __HYPERCALL_ENTRY(x)	"a" (x)
 
 #ifdef CONFIG_X86_32
 #define __HYPERCALL_RETREG	"eax"
@@ -148,7 +159,7 @@ extern struct { char _entry[32]; } hypercall_page[];
 	__HYPERCALL_0ARG();						\
 	asm volatile (__HYPERCALL					\
 		      : __HYPERCALL_0PARAM				\
-		      : __HYPERCALL_ENTRY(name)				\
+		      : __HYPERCALL_ENTRY(__HYPERVISOR_ ## name)	\
 		      : __HYPERCALL_CLOBBER0);				\
 	(type)__res;							\
 })
@@ -159,7 +170,7 @@ extern struct { char _entry[32]; } hypercall_page[];
 	__HYPERCALL_1ARG(a1);						\
 	asm volatile (__HYPERCALL					\
 		      : __HYPERCALL_1PARAM				\
-		      : __HYPERCALL_ENTRY(name)				\
+		      : __HYPERCALL_ENTRY(__HYPERVISOR_ ## name)	\
 		      : __HYPERCALL_CLOBBER1);				\
 	(type)__res;							\
 })
@@ -170,7 +181,7 @@ extern struct { char _entry[32]; } hypercall_page[];
 	__HYPERCALL_2ARG(a1, a2);					\
 	asm volatile (__HYPERCALL					\
 		      : __HYPERCALL_2PARAM				\
-		      : __HYPERCALL_ENTRY(name)				\
+		      : __HYPERCALL_ENTRY(__HYPERVISOR_ ## name)	\
 		      : __HYPERCALL_CLOBBER2);				\
 	(type)__res;							\
 })
@@ -181,7 +192,7 @@ extern struct { char _entry[32]; } hypercall_page[];
 	__HYPERCALL_3ARG(a1, a2, a3);					\
 	asm volatile (__HYPERCALL					\
 		      : __HYPERCALL_3PARAM				\
-		      : __HYPERCALL_ENTRY(name)				\
+		      : __HYPERCALL_ENTRY(__HYPERVISOR_ ## name)	\
 		      : __HYPERCALL_CLOBBER3);				\
 	(type)__res;							\
 })
@@ -192,7 +203,7 @@ extern struct { char _entry[32]; } hypercall_page[];
 	__HYPERCALL_4ARG(a1, a2, a3, a4);				\
 	asm volatile (__HYPERCALL					\
 		      : __HYPERCALL_4PARAM				\
-		      : __HYPERCALL_ENTRY(name)				\
+		      : __HYPERCALL_ENTRY(__HYPERVISOR_ ## name)	\
 		      : __HYPERCALL_CLOBBER4);				\
 	(type)__res;							\
 })
@@ -206,12 +217,9 @@ xen_single_call(unsigned int call,
 	__HYPERCALL_DECLS;
 	__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 
-	if (call >= PAGE_SIZE / sizeof(hypercall_page[0]))
-		return -EINVAL;
-
-	asm volatile(CALL_NOSPEC
+	asm volatile(__HYPERCALL
 		     : __HYPERCALL_5PARAM
-		     : [thunk_target] "a" (&hypercall_page[call])
+		     : __HYPERCALL_ENTRY(call)
 		     : __HYPERCALL_CLOBBER5);
 
 	return (long)__res;