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, 723 insertions, 0 deletions

diff --git a/include/scsi/sas.h b/include/scsi/sas.h
new file mode 100644
index 000000000..71b749bed
--- /dev/null
+++ b/include/scsi/sas.h
@@ -0,0 +1,723 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * SAS structures and definitions header file
+ *
+ * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ */
+
+#ifndef _SAS_H_
+#define _SAS_H_
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+#define SAS_ADDR_SIZE        8
+#define HASHED_SAS_ADDR_SIZE 3
+#define SAS_ADDR(_sa) ((unsigned long long) be64_to_cpu(*(__be64 *)(_sa)))
+
+#define SMP_REQUEST             0x40
+#define SMP_RESPONSE            0x41
+
+#define SSP_DATA                0x01
+#define SSP_XFER_RDY            0x05
+#define SSP_COMMAND             0x06
+#define SSP_RESPONSE            0x07
+#define SSP_TASK                0x16
+
+#define SMP_REPORT_GENERAL       0x00
+#define SMP_REPORT_MANUF_INFO    0x01
+#define SMP_READ_GPIO_REG        0x02
+#define SMP_DISCOVER             0x10
+#define SMP_REPORT_PHY_ERR_LOG   0x11
+#define SMP_REPORT_PHY_SATA      0x12
+#define SMP_REPORT_ROUTE_INFO    0x13
+#define SMP_WRITE_GPIO_REG       0x82
+#define SMP_CONF_ROUTE_INFO      0x90
+#define SMP_PHY_CONTROL          0x91
+#define SMP_PHY_TEST_FUNCTION    0x92
+
+#define SMP_RESP_FUNC_ACC        0x00
+#define SMP_RESP_FUNC_UNK        0x01
+#define SMP_RESP_FUNC_FAILED     0x02
+#define SMP_RESP_INV_FRM_LEN     0x03
+#define SMP_RESP_NO_PHY          0x10
+#define SMP_RESP_NO_INDEX        0x11
+#define SMP_RESP_PHY_NO_SATA     0x12
+#define SMP_RESP_PHY_UNK_OP      0x13
+#define SMP_RESP_PHY_UNK_TESTF   0x14
+#define SMP_RESP_PHY_TEST_INPROG 0x15
+#define SMP_RESP_PHY_VACANT      0x16
+
+/* SAM TMFs */
+#define TMF_ABORT_TASK      0x01
+#define TMF_ABORT_TASK_SET  0x02
+#define TMF_CLEAR_TASK_SET  0x04
+#define TMF_LU_RESET        0x08
+#define TMF_CLEAR_ACA       0x40
+#define TMF_QUERY_TASK      0x80
+
+/* SAS TMF responses */
+#define TMF_RESP_FUNC_COMPLETE   0x00
+#define TMF_RESP_INVALID_FRAME   0x02
+#define TMF_RESP_FUNC_ESUPP      0x04
+#define TMF_RESP_FUNC_FAILED     0x05
+#define TMF_RESP_FUNC_SUCC       0x08
+#define TMF_RESP_NO_LUN          0x09
+#define TMF_RESP_OVERLAPPED_TAG  0x0A
+
+enum sas_oob_mode {
+	OOB_NOT_CONNECTED,
+	SATA_OOB_MODE,
+	SAS_OOB_MODE
+};
+
+/* See sas_discover.c if you plan on changing these */
+enum sas_device_type {
+	/* these are SAS protocol defined (attached device type field) */
+	SAS_PHY_UNUSED = 0,
+	SAS_END_DEVICE = 1,
+	SAS_EDGE_EXPANDER_DEVICE = 2,
+	SAS_FANOUT_EXPANDER_DEVICE = 3,
+	/* these are internal to libsas */
+	SAS_HA = 4,
+	SAS_SATA_DEV = 5,
+	SAS_SATA_PM = 7,
+	SAS_SATA_PM_PORT = 8,
+	SAS_SATA_PENDING = 9,
+};
+
+enum sas_protocol {
+	SAS_PROTOCOL_NONE		= 0,
+	SAS_PROTOCOL_SATA		= 0x01,
+	SAS_PROTOCOL_SMP		= 0x02,
+	SAS_PROTOCOL_STP		= 0x04,
+	SAS_PROTOCOL_SSP		= 0x08,
+	SAS_PROTOCOL_ALL		= 0x0E,
+	SAS_PROTOCOL_STP_ALL		= SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA,
+	/* these are internal to libsas */
+	SAS_PROTOCOL_INTERNAL_ABORT	= 0x10,
+};
+
+/* From the spec; local phys only */
+enum phy_func {
+	PHY_FUNC_NOP,
+	PHY_FUNC_LINK_RESET,		  /* Enables the phy */
+	PHY_FUNC_HARD_RESET,
+	PHY_FUNC_DISABLE,
+	PHY_FUNC_CLEAR_ERROR_LOG = 5,
+	PHY_FUNC_CLEAR_AFFIL,
+	PHY_FUNC_TX_SATA_PS_SIGNAL,
+	PHY_FUNC_RELEASE_SPINUP_HOLD = 0x10, /* LOCAL PORT ONLY! */
+	PHY_FUNC_SET_LINK_RATE,
+	PHY_FUNC_GET_EVENTS,
+};
+
+/* SAS LLDD would need to report only _very_few_ of those, like BROADCAST.
+ * Most of those are here for completeness.
+ */
+enum sas_prim {
+	SAS_PRIM_AIP_NORMAL = 1,
+	SAS_PRIM_AIP_R0     = 2,
+	SAS_PRIM_AIP_R1     = 3,
+	SAS_PRIM_AIP_R2     = 4,
+	SAS_PRIM_AIP_WC     = 5,
+	SAS_PRIM_AIP_WD     = 6,
+	SAS_PRIM_AIP_WP     = 7,
+	SAS_PRIM_AIP_RWP    = 8,
+
+	SAS_PRIM_BC_CH      = 9,
+	SAS_PRIM_BC_RCH0    = 10,
+	SAS_PRIM_BC_RCH1    = 11,
+	SAS_PRIM_BC_R0      = 12,
+	SAS_PRIM_BC_R1      = 13,
+	SAS_PRIM_BC_R2      = 14,
+	SAS_PRIM_BC_R3      = 15,
+	SAS_PRIM_BC_R4      = 16,
+
+	SAS_PRIM_NOTIFY_ENSP= 17,
+	SAS_PRIM_NOTIFY_R0  = 18,
+	SAS_PRIM_NOTIFY_R1  = 19,
+	SAS_PRIM_NOTIFY_R2  = 20,
+
+	SAS_PRIM_CLOSE_CLAF = 21,
+	SAS_PRIM_CLOSE_NORM = 22,
+	SAS_PRIM_CLOSE_R0   = 23,
+	SAS_PRIM_CLOSE_R1   = 24,
+
+	SAS_PRIM_OPEN_RTRY  = 25,
+	SAS_PRIM_OPEN_RJCT  = 26,
+	SAS_PRIM_OPEN_ACPT  = 27,
+
+	SAS_PRIM_DONE       = 28,
+	SAS_PRIM_BREAK      = 29,
+
+	SATA_PRIM_DMAT      = 33,
+	SATA_PRIM_PMNAK     = 34,
+	SATA_PRIM_PMACK     = 35,
+	SATA_PRIM_PMREQ_S   = 36,
+	SATA_PRIM_PMREQ_P   = 37,
+	SATA_SATA_R_ERR     = 38,
+};
+
+enum sas_open_rej_reason {
+	/* Abandon open */
+	SAS_OREJ_UNKNOWN   = 0,
+	SAS_OREJ_BAD_DEST  = 1,
+	SAS_OREJ_CONN_RATE = 2,
+	SAS_OREJ_EPROTO    = 3,
+	SAS_OREJ_RESV_AB0  = 4,
+	SAS_OREJ_RESV_AB1  = 5,
+	SAS_OREJ_RESV_AB2  = 6,
+	SAS_OREJ_RESV_AB3  = 7,
+	SAS_OREJ_WRONG_DEST= 8,
+	SAS_OREJ_STP_NORES = 9,
+
+	/* Retry open */
+	SAS_OREJ_NO_DEST   = 10,
+	SAS_OREJ_PATH_BLOCKED = 11,
+	SAS_OREJ_RSVD_CONT0 = 12,
+	SAS_OREJ_RSVD_CONT1 = 13,
+	SAS_OREJ_RSVD_INIT0 = 14,
+	SAS_OREJ_RSVD_INIT1 = 15,
+	SAS_OREJ_RSVD_STOP0 = 16,
+	SAS_OREJ_RSVD_STOP1 = 17,
+	SAS_OREJ_RSVD_RETRY = 18,
+};
+
+enum sas_gpio_reg_type {
+	SAS_GPIO_REG_CFG   = 0,
+	SAS_GPIO_REG_RX    = 1,
+	SAS_GPIO_REG_RX_GP = 2,
+	SAS_GPIO_REG_TX    = 3,
+	SAS_GPIO_REG_TX_GP = 4,
+};
+
+/* Response frame DATAPRES field */
+enum {
+	SAS_DATAPRES_NO_DATA		= 0,
+	SAS_DATAPRES_RESPONSE_DATA	= 1,
+	SAS_DATAPRES_SENSE_DATA		= 2,
+};
+
+struct  dev_to_host_fis {
+	u8     fis_type;	  /* 0x34 */
+	u8     flags;
+	u8     status;
+	u8     error;
+
+	u8     lbal;
+	union { u8 lbam; u8 byte_count_low; };
+	union { u8 lbah; u8 byte_count_high; };
+	u8     device;
+
+	u8     lbal_exp;
+	u8     lbam_exp;
+	u8     lbah_exp;
+	u8     _r_a;
+
+	union { u8  sector_count; u8 interrupt_reason; };
+	u8     sector_count_exp;
+	u8     _r_b;
+	u8     _r_c;
+
+	u32    _r_d;
+} __attribute__ ((packed));
+
+struct host_to_dev_fis {
+	u8     fis_type;	  /* 0x27 */
+	u8     flags;
+	u8     command;
+	u8     features;
+
+	u8     lbal;
+	union { u8 lbam; u8 byte_count_low; };
+	union { u8 lbah; u8 byte_count_high; };
+	u8     device;
+
+	u8     lbal_exp;
+	u8     lbam_exp;
+	u8     lbah_exp;
+	u8     features_exp;
+
+	union { u8  sector_count; u8 interrupt_reason; };
+	u8     sector_count_exp;
+	u8     _r_a;
+	u8     control;
+
+	u32    _r_b;
+} __attribute__ ((packed));
+
+/* Prefer to have code clarity over header file clarity.
+ */
+#ifdef __LITTLE_ENDIAN_BITFIELD
+struct sas_identify_frame {
+	/* Byte 0 */
+	u8  frame_type:4;
+	u8  dev_type:3;
+	u8  _un0:1;
+
+	/* Byte 1 */
+	u8  _un1;
+
+	/* Byte 2 */
+	union {
+		struct {
+			u8  _un20:1;
+			u8  smp_iport:1;
+			u8  stp_iport:1;
+			u8  ssp_iport:1;
+			u8  _un247:4;
+		};
+		u8 initiator_bits;
+	};
+
+	/* Byte 3 */
+	union {
+		struct {
+			u8  _un30:1;
+			u8 smp_tport:1;
+			u8 stp_tport:1;
+			u8 ssp_tport:1;
+			u8 _un347:4;
+		};
+		u8 target_bits;
+	};
+
+	/* Byte 4 - 11 */
+	u8 _un4_11[8];
+
+	/* Byte 12 - 19 */
+	u8 sas_addr[SAS_ADDR_SIZE];
+
+	/* Byte 20 */
+	u8 phy_id;
+
+	u8 _un21_27[7];
+
+	__be32 crc;
+} __attribute__ ((packed));
+
+struct ssp_frame_hdr {
+	u8     frame_type;
+	u8     hashed_dest_addr[HASHED_SAS_ADDR_SIZE];
+	u8     _r_a;
+	u8     hashed_src_addr[HASHED_SAS_ADDR_SIZE];
+	__be16 _r_b;
+
+	u8     changing_data_ptr:1;
+	u8     retransmit:1;
+	u8     retry_data_frames:1;
+	u8     _r_c:5;
+
+	u8     num_fill_bytes:2;
+	u8     _r_d:6;
+
+	u32    _r_e;
+	__be16 tag;
+	__be16 tptt;
+	__be32 data_offs;
+} __attribute__ ((packed));
+
+struct ssp_response_iu {
+	u8     _r_a[10];
+
+	u8     datapres:2;
+	u8     _r_b:6;
+
+	u8     status;
+
+	u32    _r_c;
+
+	__be32 sense_data_len;
+	__be32 response_data_len;
+
+	union {
+		DECLARE_FLEX_ARRAY(u8, resp_data);
+		DECLARE_FLEX_ARRAY(u8, sense_data);
+	};
+} __attribute__ ((packed));
+
+struct ssp_command_iu {
+	u8     lun[8];
+	u8     _r_a;
+
+	union {
+		struct {
+			u8  attr:3;
+			u8  prio:4;
+			u8  efb:1;
+		};
+		u8 efb_prio_attr;
+	};
+
+	u8    _r_b;
+
+	u8    _r_c:2;
+	u8    add_cdb_len:6;
+
+	u8    cdb[16];
+	u8    add_cdb[];
+} __attribute__ ((packed));
+
+struct xfer_rdy_iu {
+	__be32 requested_offset;
+	__be32 write_data_len;
+	__be32 _r_a;
+} __attribute__ ((packed));
+
+struct ssp_tmf_iu {
+	u8     lun[8];
+	u16    _r_a;
+	u8     tmf;
+	u8     _r_b;
+	__be16 tag;
+	u8     _r_c[14];
+} __attribute__ ((packed));
+
+/* ---------- SMP ---------- */
+
+struct report_general_resp {
+	__be16  change_count;
+	__be16  route_indexes;
+	u8      _r_a;
+	u8      num_phys;
+
+	u8      conf_route_table:1;
+	u8      configuring:1;
+	u8	config_others:1;
+	u8	orej_retry_supp:1;
+	u8	stp_cont_awt:1;
+	u8	self_config:1;
+	u8	zone_config:1;
+	u8	t2t_supp:1;
+
+	u8      _r_c;
+
+	u8      enclosure_logical_id[8];
+
+	u8      _r_d[12];
+} __attribute__ ((packed));
+
+struct discover_resp {
+	u8    _r_a[5];
+
+	u8    phy_id;
+	__be16 _r_b;
+
+	u8    _r_c:4;
+	u8    attached_dev_type:3;
+	u8    _r_d:1;
+
+	u8    linkrate:4;
+	u8    _r_e:4;
+
+	u8    attached_sata_host:1;
+	u8    iproto:3;
+	u8    _r_f:4;
+
+	u8    attached_sata_dev:1;
+	u8    tproto:3;
+	u8    _r_g:3;
+	u8    attached_sata_ps:1;
+
+	u8    sas_addr[8];
+	u8    attached_sas_addr[8];
+	u8    attached_phy_id;
+
+	u8    _r_h[7];
+
+	u8    hmin_linkrate:4;
+	u8    pmin_linkrate:4;
+	u8    hmax_linkrate:4;
+	u8    pmax_linkrate:4;
+
+	u8    change_count;
+
+	u8    pptv:4;
+	u8    _r_i:3;
+	u8    virtual:1;
+
+	u8    routing_attr:4;
+	u8    _r_j:4;
+
+	u8    conn_type;
+	u8    conn_el_index;
+	u8    conn_phy_link;
+
+	u8    _r_k[8];
+} __attribute__ ((packed));
+
+struct report_phy_sata_resp {
+	u8    _r_a[5];
+
+	u8    phy_id;
+	u8    _r_b;
+
+	u8    affil_valid:1;
+	u8    affil_supp:1;
+	u8    _r_c:6;
+
+	u32    _r_d;
+
+	u8    stp_sas_addr[8];
+
+	struct dev_to_host_fis fis;
+
+	u32   _r_e;
+
+	u8    affil_stp_ini_addr[8];
+
+	__be32 crc;
+} __attribute__ ((packed));
+
+#elif defined(__BIG_ENDIAN_BITFIELD)
+struct sas_identify_frame {
+	/* Byte 0 */
+	u8  _un0:1;
+	u8  dev_type:3;
+	u8  frame_type:4;
+
+	/* Byte 1 */
+	u8  _un1;
+
+	/* Byte 2 */
+	union {
+		struct {
+			u8  _un247:4;
+			u8  ssp_iport:1;
+			u8  stp_iport:1;
+			u8  smp_iport:1;
+			u8  _un20:1;
+		};
+		u8 initiator_bits;
+	};
+
+	/* Byte 3 */
+	union {
+		struct {
+			u8 _un347:4;
+			u8 ssp_tport:1;
+			u8 stp_tport:1;
+			u8 smp_tport:1;
+			u8 _un30:1;
+		};
+		u8 target_bits;
+	};
+
+	/* Byte 4 - 11 */
+	u8 _un4_11[8];
+
+	/* Byte 12 - 19 */
+	u8 sas_addr[SAS_ADDR_SIZE];
+
+	/* Byte 20 */
+	u8 phy_id;
+
+	u8 _un21_27[7];
+
+	__be32 crc;
+} __attribute__ ((packed));
+
+struct ssp_frame_hdr {
+	u8     frame_type;
+	u8     hashed_dest_addr[HASHED_SAS_ADDR_SIZE];
+	u8     _r_a;
+	u8     hashed_src_addr[HASHED_SAS_ADDR_SIZE];
+	__be16 _r_b;
+
+	u8     _r_c:5;
+	u8     retry_data_frames:1;
+	u8     retransmit:1;
+	u8     changing_data_ptr:1;
+
+	u8     _r_d:6;
+	u8     num_fill_bytes:2;
+
+	u32    _r_e;
+	__be16 tag;
+	__be16 tptt;
+	__be32 data_offs;
+} __attribute__ ((packed));
+
+struct ssp_response_iu {
+	u8     _r_a[10];
+
+	u8     _r_b:6;
+	u8     datapres:2;
+
+	u8     status;
+
+	u32    _r_c;
+
+	__be32 sense_data_len;
+	__be32 response_data_len;
+
+	union {
+		DECLARE_FLEX_ARRAY(u8, resp_data);
+		DECLARE_FLEX_ARRAY(u8, sense_data);
+	};
+} __attribute__ ((packed));
+
+struct ssp_command_iu {
+	u8     lun[8];
+	u8     _r_a;
+
+	union {
+		struct {
+			u8  efb:1;
+			u8  prio:4;
+			u8  attr:3;
+		};
+		u8 efb_prio_attr;
+	};
+
+	u8    _r_b;
+
+	u8    add_cdb_len:6;
+	u8    _r_c:2;
+
+	u8    cdb[16];
+	u8    add_cdb[];
+} __attribute__ ((packed));
+
+struct xfer_rdy_iu {
+	__be32 requested_offset;
+	__be32 write_data_len;
+	__be32 _r_a;
+} __attribute__ ((packed));
+
+struct ssp_tmf_iu {
+	u8     lun[8];
+	u16    _r_a;
+	u8     tmf;
+	u8     _r_b;
+	__be16 tag;
+	u8     _r_c[14];
+} __attribute__ ((packed));
+
+/* ---------- SMP ---------- */
+
+struct report_general_resp {
+	__be16  change_count;
+	__be16  route_indexes;
+	u8      _r_a;
+	u8      num_phys;
+
+	u8	t2t_supp:1;
+	u8	zone_config:1;
+	u8	self_config:1;
+	u8	stp_cont_awt:1;
+	u8	orej_retry_supp:1;
+	u8	config_others:1;
+	u8      configuring:1;
+	u8      conf_route_table:1;
+
+	u8      _r_c;
+
+	u8      enclosure_logical_id[8];
+
+	u8      _r_d[12];
+} __attribute__ ((packed));
+
+struct discover_resp {
+	u8    _r_a[5];
+
+	u8    phy_id;
+	__be16 _r_b;
+
+	u8    _r_d:1;
+	u8    attached_dev_type:3;
+	u8    _r_c:4;
+
+	u8    _r_e:4;
+	u8    linkrate:4;
+
+	u8    _r_f:4;
+	u8    iproto:3;
+	u8    attached_sata_host:1;
+
+	u8    attached_sata_ps:1;
+	u8    _r_g:3;
+	u8    tproto:3;
+	u8    attached_sata_dev:1;
+
+	u8    sas_addr[8];
+	u8    attached_sas_addr[8];
+	u8    attached_phy_id;
+
+	u8    _r_h[7];
+
+	u8    pmin_linkrate:4;
+	u8    hmin_linkrate:4;
+	u8    pmax_linkrate:4;
+	u8    hmax_linkrate:4;
+
+	u8    change_count;
+
+	u8    virtual:1;
+	u8    _r_i:3;
+	u8    pptv:4;
+
+	u8    _r_j:4;
+	u8    routing_attr:4;
+
+	u8    conn_type;
+	u8    conn_el_index;
+	u8    conn_phy_link;
+
+	u8    _r_k[8];
+} __attribute__ ((packed));
+
+struct report_phy_sata_resp {
+	u8    _r_a[5];
+
+	u8    phy_id;
+	u8    _r_b;
+
+	u8    _r_c:6;
+	u8    affil_supp:1;
+	u8    affil_valid:1;
+
+	u32   _r_d;
+
+	u8    stp_sas_addr[8];
+
+	struct dev_to_host_fis fis;
+
+	u32   _r_e;
+
+	u8    affil_stp_ini_addr[8];
+
+	__be32 crc;
+} __attribute__ ((packed));
+
+#else
+#error "Bitfield order not defined!"
+#endif
+
+struct smp_rg_resp {
+	u8    frame_type;
+	u8    function;
+	u8    result;
+	u8    reserved;
+	struct report_general_resp rg;
+} __attribute__ ((packed));
+
+struct smp_disc_resp {
+	u8    frame_type;
+	u8    function;
+	u8    result;
+	u8    reserved;
+	struct discover_resp disc;
+} __attribute__ ((packed));
+
+struct smp_rps_resp {
+	u8    frame_type;
+	u8    function;
+	u8    result;
+	u8    reserved;
+	struct report_phy_sata_resp rps;
+} __attribute__ ((packed));
+
+#endif /* _SAS_H_ */