KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted

Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.

Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/sound/soc/sof/ipc4-telemetry.h b/sound/soc/sof/ipc4-telemetry.h
new file mode 100644
index 000000000..9298f8acc
--- /dev/null
+++ b/sound/soc/sof/ipc4-telemetry.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * Copyright(c) 2023 Intel Corporation
+ */
+
+#ifndef __SOUND_SOC_SOF_IPC4_TELEMETRY_H
+#define __SOUND_SOC_SOF_IPC4_TELEMETRY_H
+
+/* Target code */
+enum sof_ipc4_coredump_tgt_code {
+	COREDUMP_TGT_UNKNOWN = 0,
+	COREDUMP_TGT_X86,
+	COREDUMP_TGT_X86_64,
+	COREDUMP_TGT_ARM_CORTEX_M,
+	COREDUMP_TGT_RISC_V,
+	COREDUMP_TGT_XTENSA,
+};
+
+#define COREDUMP_ARCH_HDR_ID 'A'
+#define COREDUMP_HDR_ID0 'Z'
+#define COREDUMP_HDR_ID1 'E'
+
+#define XTENSA_BLOCK_HDR_VER		2
+#define XTENSA_CORE_DUMP_SEPARATOR	0x0DEC0DEB
+#define XTENSA_CORE_AR_REGS_COUNT	16
+#define XTENSA_SOC_INTEL_ADSP		3
+#define XTENSA_TOOL_CHAIN_ZEPHYR	1
+#define XTENSA_TOOL_CHAIN_XCC		2
+
+/* Coredump header */
+struct sof_ipc4_coredump_hdr {
+	/* 'Z', 'E' as identifier of file */
+	char id[2];
+
+	/* Identify the version of the header */
+	u16 hdr_version;
+
+	/* Indicate which target (e.g. architecture or SoC) */
+	u16 tgt_code;
+
+	/* Size of uintptr_t in power of 2. (e.g. 5 for 32-bit, 6 for 64-bit) */
+	u8 ptr_size_bits;
+
+	u8 flag;
+
+	/* Reason for the fatal error */
+	u32 reason;
+} __packed;
+
+/* Architecture-specific block header */
+struct sof_ipc4_coredump_arch_hdr {
+	/* COREDUMP_ARCH_HDR_ID to indicate this is a architecture-specific block */
+	char id;
+
+	/* Identify the version of this block */
+	u16 hdr_version;
+
+	/* Number of bytes following the header */
+	u16 num_bytes;
+} __packed;
+
+struct sof_ipc4_telemetry_slot_data {
+	u32 separator;
+	struct sof_ipc4_coredump_hdr hdr;
+	struct sof_ipc4_coredump_arch_hdr arch_hdr;
+	u32 arch_data[];
+} __packed;
+
+void sof_ipc4_create_exception_debugfs_node(struct snd_sof_dev *sdev);
+#endif