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* [PATCH] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay
@ 2025-12-05 23:26 Sean Christopherson
  2025-12-06  3:38 ` Gustavo A. R. Silva
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: Sean Christopherson @ 2025-12-05 23:26 UTC (permalink / raw)
  To: Marc Zyngier, Oliver Upton, Tianrui Zhao, Bibo Mao, Huacai Chen,
	Madhavan Srinivasan, Anup Patel, Paul Walmsley, Palmer Dabbelt,
	Albert Ou, Christian Borntraeger, Janosch Frank, Claudio Imbrenda,
	Sean Christopherson, Paolo Bonzini
  Cc: linux-arm-kernel, kvmarm, kvm, loongarch, linux-mips,
	linuxppc-dev, kvm-riscv, linux-riscv, linux-kernel,
	Gustavo A . R . Silva

Remove KVM's internal pseudo-overlay of kvm_stats_desc, which subtly
aliases the flexible name[] in the uAPI definition with a fixed-size array
of the same name.  The unusual embedded structure results in compiler
warnings due to -Wflex-array-member-not-at-end, and also necessitates an
extra level of dereferencing in KVM.  To avoid the "overlay", define the
uAPI structure to have a fixed-size name when building for the kernel.

Opportunistically clean up the indentation for the stats macros, and
replace spaces with tabs.

No functional change intended.

Reported-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Closes: https://lore.kernel.org/all/aPfNKRpLfhmhYqfP@kspp
Signed-off-by: Sean Christopherson <seanjc@google.com>
---

Posting this as a standalone patch/email to make review and merging easier
(assuming no one hates on the __KERNEL__ shenanigans).
 
 arch/arm64/kvm/guest.c    |  4 +-
 arch/loongarch/kvm/vcpu.c |  2 +-
 arch/loongarch/kvm/vm.c   |  2 +-
 arch/mips/kvm/mips.c      |  4 +-
 arch/powerpc/kvm/book3s.c |  4 +-
 arch/powerpc/kvm/booke.c  |  4 +-
 arch/riscv/kvm/vcpu.c     |  2 +-
 arch/riscv/kvm/vm.c       |  2 +-
 arch/s390/kvm/kvm-s390.c  |  4 +-
 arch/x86/kvm/x86.c        |  4 +-
 include/linux/kvm_host.h  | 83 +++++++++++++++++----------------------
 include/uapi/linux/kvm.h  |  8 ++++
 virt/kvm/binary_stats.c   |  2 +-
 virt/kvm/kvm_main.c       | 20 +++++-----
 14 files changed, 70 insertions(+), 75 deletions(-)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 1c87699fd886..332c453b87cf 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,7 +29,7 @@
 
 #include "trace.h"
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS()
 };
 
@@ -42,7 +42,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, hvc_exit_stat),
 	STATS_DESC_COUNTER(VCPU, wfe_exit_stat),
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 6d833599ef2e..2bcbd27f1152 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,7 +13,7 @@
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, int_exits),
 	STATS_DESC_COUNTER(VCPU, idle_exits),
diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c
index 194ccbcdc3b3..7deff56e0e1a 100644
--- a/arch/loongarch/kvm/vm.c
+++ b/arch/loongarch/kvm/vm.c
@@ -10,7 +10,7 @@
 #include <asm/kvm_eiointc.h>
 #include <asm/kvm_pch_pic.h>
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS(),
 	STATS_DESC_ICOUNTER(VM, pages),
 	STATS_DESC_ICOUNTER(VM, hugepages),
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index b0fb92fda4d4..23e69baad453 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -38,7 +38,7 @@
 #define VECTORSPACING 0x100	/* for EI/VI mode */
 #endif
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS()
 };
 
@@ -51,7 +51,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, wait_exits),
 	STATS_DESC_COUNTER(VCPU, cache_exits),
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index d79c5d1098c0..2efbe05caed7 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -38,7 +38,7 @@
 
 /* #define EXIT_DEBUG */
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS(),
 	STATS_DESC_ICOUNTER(VM, num_2M_pages),
 	STATS_DESC_ICOUNTER(VM, num_1G_pages)
@@ -53,7 +53,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, sum_exits),
 	STATS_DESC_COUNTER(VCPU, mmio_exits),
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 3401b96be475..f3ddb24ece74 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -36,7 +36,7 @@
 
 unsigned long kvmppc_booke_handlers;
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS(),
 	STATS_DESC_ICOUNTER(VM, num_2M_pages),
 	STATS_DESC_ICOUNTER(VM, num_1G_pages)
@@ -51,7 +51,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, sum_exits),
 	STATS_DESC_COUNTER(VCPU, mmio_exits),
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index a55a95da54d0..fdd99ac1e714 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -24,7 +24,7 @@
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, ecall_exit_stat),
 	STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 66d91ae6e9b2..715a06ae8c13 100644
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c
@@ -13,7 +13,7 @@
 #include <linux/kvm_host.h>
 #include <asm/kvm_mmu.h>
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS()
 };
 static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 70dd9ce8cf2b..1cc90b8cf768 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -65,7 +65,7 @@
 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
 			   (KVM_MAX_VCPUS + LOCAL_IRQS))
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS(),
 	STATS_DESC_COUNTER(VM, inject_io),
 	STATS_DESC_COUNTER(VM, inject_float_mchk),
@@ -91,7 +91,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, exit_userspace),
 	STATS_DESC_COUNTER(VCPU, exit_null),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0c6d899d53dd..62ee4816e573 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -237,7 +237,7 @@ EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_ipiv);
 bool __read_mostly enable_device_posted_irqs = true;
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_device_posted_irqs);
 
-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
 	KVM_GENERIC_VM_STATS(),
 	STATS_DESC_COUNTER(VM, mmu_shadow_zapped),
 	STATS_DESC_COUNTER(VM, mmu_pte_write),
@@ -263,7 +263,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 		       sizeof(kvm_vm_stats_desc),
 };
 
-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, pf_taken),
 	STATS_DESC_COUNTER(VCPU, pf_fixed),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d93f75b05ae2..7428d9949382 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1927,56 +1927,43 @@ enum kvm_stat_kind {
 
 struct kvm_stat_data {
 	struct kvm *kvm;
-	const struct _kvm_stats_desc *desc;
+	const struct kvm_stats_desc *desc;
 	enum kvm_stat_kind kind;
 };
 
-struct _kvm_stats_desc {
-	struct kvm_stats_desc desc;
-	char name[KVM_STATS_NAME_SIZE];
-};
-
-#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz)		       \
-	.flags = type | unit | base |					       \
-		 BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) |	       \
-		 BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) |	       \
-		 BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK),	       \
-	.exponent = exp,						       \
-	.size = sz,							       \
+#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz)		\
+	.flags = type | unit | base |					\
+		 BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) |       \
+		 BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) |	\
+		 BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK),	\
+	.exponent = exp,						\
+	.size = sz,							\
 	.bucket_size = bsz
 
-#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz)	       \
-	{								       \
-		{							       \
-			STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),     \
-			.offset = offsetof(struct kvm_vm_stat, generic.stat)   \
-		},							       \
-		.name = #stat,						       \
-	}
-#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz)	       \
-	{								       \
-		{							       \
-			STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),     \
-			.offset = offsetof(struct kvm_vcpu_stat, generic.stat) \
-		},							       \
-		.name = #stat,						       \
-	}
-#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz)		       \
-	{								       \
-		{							       \
-			STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),     \
-			.offset = offsetof(struct kvm_vm_stat, stat)	       \
-		},							       \
-		.name = #stat,						       \
-	}
-#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz)		       \
-	{								       \
-		{							       \
-			STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),     \
-			.offset = offsetof(struct kvm_vcpu_stat, stat)	       \
-		},							       \
-		.name = #stat,						       \
-	}
+#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz)	\
+{									\
+	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),		\
+	.offset = offsetof(struct kvm_vm_stat, generic.stat),		\
+	.name = #stat,							\
+}
+#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz)	\
+{									\
+	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),		\
+	.offset = offsetof(struct kvm_vcpu_stat, generic.stat),		\
+	.name = #stat,							\
+}
+#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz)		\
+{									\
+	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),		\
+	.offset = offsetof(struct kvm_vm_stat, stat),			\
+	.name = #stat,							\
+}
+#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz)		\
+{									\
+	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz),		\
+	.offset = offsetof(struct kvm_vcpu_stat, stat),			\
+	.name = #stat,							\
+}
 /* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */
 #define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz)		       \
 	SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
@@ -2053,7 +2040,7 @@ struct _kvm_stats_desc {
 	STATS_DESC_IBOOLEAN(VCPU_GENERIC, blocking)
 
 ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
-		       const struct _kvm_stats_desc *desc,
+		       const struct kvm_stats_desc *desc,
 		       void *stats, size_t size_stats,
 		       char __user *user_buffer, size_t size, loff_t *offset);
 
@@ -2098,9 +2085,9 @@ static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
 
 
 extern const struct kvm_stats_header kvm_vm_stats_header;
-extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
+extern const struct kvm_stats_desc kvm_vm_stats_desc[];
 extern const struct kvm_stats_header kvm_vcpu_stats_header;
-extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
+extern const struct kvm_stats_desc kvm_vcpu_stats_desc[];
 
 #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
 static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index dddb781b0507..76bd54848b11 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -14,6 +14,10 @@
 #include <linux/ioctl.h>
 #include <asm/kvm.h>
 
+#ifdef __KERNEL__
+#include <linux/kvm_types.h>
+#endif
+
 #define KVM_API_VERSION 12
 
 /*
@@ -1579,7 +1583,11 @@ struct kvm_stats_desc {
 	__u16 size;
 	__u32 offset;
 	__u32 bucket_size;
+#ifdef __KERNEL__
+	char name[KVM_STATS_NAME_SIZE];
+#else
 	char name[];
+#endif
 };
 
 #define KVM_GET_STATS_FD  _IO(KVMIO,  0xce)
diff --git a/virt/kvm/binary_stats.c b/virt/kvm/binary_stats.c
index eefca6c69f51..76ce697c773b 100644
--- a/virt/kvm/binary_stats.c
+++ b/virt/kvm/binary_stats.c
@@ -50,7 +50,7 @@
  * Return: the number of bytes that has been successfully read
  */
 ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
-		       const struct _kvm_stats_desc *desc,
+		       const struct kvm_stats_desc *desc,
 		       void *stats, size_t size_stats,
 		       char __user *user_buffer, size_t size, loff_t *offset)
 {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 74e1afd67b44..6ebf1936c8d4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -982,9 +982,9 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
 		kvm_free_memslot(kvm, memslot);
 }
 
-static umode_t kvm_stats_debugfs_mode(const struct _kvm_stats_desc *pdesc)
+static umode_t kvm_stats_debugfs_mode(const struct kvm_stats_desc *desc)
 {
-	switch (pdesc->desc.flags & KVM_STATS_TYPE_MASK) {
+	switch (desc->flags & KVM_STATS_TYPE_MASK) {
 	case KVM_STATS_TYPE_INSTANT:
 		return 0444;
 	case KVM_STATS_TYPE_CUMULATIVE:
@@ -1019,7 +1019,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, const char *fdname)
 	struct dentry *dent;
 	char dir_name[ITOA_MAX_LEN * 2];
 	struct kvm_stat_data *stat_data;
-	const struct _kvm_stats_desc *pdesc;
+	const struct kvm_stats_desc *pdesc;
 	int i, ret = -ENOMEM;
 	int kvm_debugfs_num_entries = kvm_vm_stats_header.num_desc +
 				      kvm_vcpu_stats_header.num_desc;
@@ -6160,11 +6160,11 @@ static int kvm_stat_data_get(void *data, u64 *val)
 	switch (stat_data->kind) {
 	case KVM_STAT_VM:
 		r = kvm_get_stat_per_vm(stat_data->kvm,
-					stat_data->desc->desc.offset, val);
+					stat_data->desc->offset, val);
 		break;
 	case KVM_STAT_VCPU:
 		r = kvm_get_stat_per_vcpu(stat_data->kvm,
-					  stat_data->desc->desc.offset, val);
+					  stat_data->desc->offset, val);
 		break;
 	}
 
@@ -6182,11 +6182,11 @@ static int kvm_stat_data_clear(void *data, u64 val)
 	switch (stat_data->kind) {
 	case KVM_STAT_VM:
 		r = kvm_clear_stat_per_vm(stat_data->kvm,
-					  stat_data->desc->desc.offset);
+					  stat_data->desc->offset);
 		break;
 	case KVM_STAT_VCPU:
 		r = kvm_clear_stat_per_vcpu(stat_data->kvm,
-					    stat_data->desc->desc.offset);
+					    stat_data->desc->offset);
 		break;
 	}
 
@@ -6334,7 +6334,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
 static void kvm_init_debug(void)
 {
 	const struct file_operations *fops;
-	const struct _kvm_stats_desc *pdesc;
+	const struct kvm_stats_desc *pdesc;
 	int i;
 
 	kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
@@ -6347,7 +6347,7 @@ static void kvm_init_debug(void)
 			fops = &vm_stat_readonly_fops;
 		debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc),
 				kvm_debugfs_dir,
-				(void *)(long)pdesc->desc.offset, fops);
+				(void *)(long)pdesc->offset, fops);
 	}
 
 	for (i = 0; i < kvm_vcpu_stats_header.num_desc; ++i) {
@@ -6358,7 +6358,7 @@ static void kvm_init_debug(void)
 			fops = &vcpu_stat_readonly_fops;
 		debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc),
 				kvm_debugfs_dir,
-				(void *)(long)pdesc->desc.offset, fops);
+				(void *)(long)pdesc->offset, fops);
 	}
 }
 

base-commit: e0c26d47def7382d7dbd9cad58bc653aed75737a
-- 
2.52.0.223.gf5cc29aaa4-goog


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Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-12-05 23:26 [PATCH] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay Sean Christopherson
2025-12-06  3:38 ` Gustavo A. R. Silva
2025-12-06  8:16 ` Bibo Mao
2025-12-07  5:14 ` Anup Patel
2025-12-08 10:32 ` Christian Borntraeger
2025-12-08 10:42 ` Marc Zyngier

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