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, 232 insertions, 0 deletions

diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
new file mode 100644
index 000000000..533623382
--- /dev/null
+++ b/drivers/scsi/Makefile
@@ -0,0 +1,232 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for linux/drivers/scsi
+#
+# 30 May 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+# 20 Sep 2000, Torben Mathiasen <tmm@image.dk>
+# Changed link order to reflect new scsi initialization.
+#
+# *!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!
+# The link order must be, SCSI Core, SCSI HBA drivers, and
+# lastly SCSI peripheral drivers (disk/tape/cdrom/etc.) to
+# satisfy certain initialization assumptions in the SCSI layer.
+# *!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!*!
+
+CONTEXT_ANALYSIS_constants.o := y
+CONTEXT_ANALYSIS_hosts.o := y
+CONTEXT_ANALYSIS_scsi.o := y
+CONTEXT_ANALYSIS_scsi_common.o := y
+CONTEXT_ANALYSIS_scsi_devinfo.o := y
+CONTEXT_ANALYSIS_scsi_dh.o := y
+CONTEXT_ANALYSIS_scsi_error.o := y
+CONTEXT_ANALYSIS_scsi_ioctl.o := y
+CONTEXT_ANALYSIS_scsi_lib.o := y
+CONTEXT_ANALYSIS_scsi_lib_dma.o := y
+CONTEXT_ANALYSIS_scsi_logging.o := y
+CONTEXT_ANALYSIS_scsi_netlink.o := y
+CONTEXT_ANALYSIS_scsi_pm.o := y
+CONTEXT_ANALYSIS_scsi_proc.o := y
+CONTEXT_ANALYSIS_scsi_scan.o := y
+CONTEXT_ANALYSIS_scsi_sysfs.o := y
+CONTEXT_ANALYSIS_scsi_trace.o := y
+CONTEXT_ANALYSIS_scsicam.o := y
+CONTEXT_ANALYSIS_sd.o := y
+CONTEXT_ANALYSIS_sd_dif.o := y
+CONTEXT_ANALYSIS_sd_zbc.o := y
+CONTEXT_ANALYSIS_sr.o := y
+CONTEXT_ANALYSIS_sr_ioctl.o := y
+
+CFLAGS_aha152x.o =   -DAHA152X_STAT -DAUTOCONF
+
+obj-$(CONFIG_PCMCIA)		+= pcmcia/
+
+obj-$(CONFIG_SCSI)		+= scsi_mod.o
+obj-$(CONFIG_SCSI_COMMON)	+= scsi_common.o
+
+obj-$(CONFIG_RAID_ATTRS)	+= raid_class.o
+
+obj-$(CONFIG_SCSI_PROTO_TEST)	+= scsi_proto_test.o
+
+# --- NOTE ORDERING HERE ---
+# For kernel non-modular link, transport attributes need to
+# be initialised before drivers
+# --------------------------
+obj-$(CONFIG_SCSI_SPI_ATTRS)	+= scsi_transport_spi.o
+obj-$(CONFIG_SCSI_FC_ATTRS) 	+= scsi_transport_fc.o
+obj-$(CONFIG_SCSI_ISCSI_ATTRS)	+= scsi_transport_iscsi.o
+obj-$(CONFIG_SCSI_SAS_ATTRS)	+= scsi_transport_sas.o
+obj-$(CONFIG_SCSI_SAS_LIBSAS)	+= libsas/
+obj-$(CONFIG_SCSI_SRP_ATTRS)	+= scsi_transport_srp.o
+obj-$(CONFIG_SCSI_DH)		+= device_handler/
+
+obj-$(CONFIG_LIBFC)		+= libfc/
+obj-$(CONFIG_LIBFCOE)		+= fcoe/
+obj-$(CONFIG_FCOE)		+= fcoe/
+obj-$(CONFIG_FCOE_FNIC)		+= fnic/
+obj-$(CONFIG_SCSI_SNIC)		+= snic/
+obj-$(CONFIG_SCSI_BNX2X_FCOE)	+= libfc/ fcoe/ bnx2fc/
+obj-$(CONFIG_QEDF)		+= qedf/
+obj-$(CONFIG_ISCSI_TCP) 	+= libiscsi.o	libiscsi_tcp.o iscsi_tcp.o
+obj-$(CONFIG_INFINIBAND_ISER) 	+= libiscsi.o
+obj-$(CONFIG_ISCSI_BOOT_SYSFS)	+= iscsi_boot_sysfs.o
+obj-$(CONFIG_SCSI_A4000T)	+= 53c700.o	a4000t.o
+obj-$(CONFIG_SCSI_ZORRO7XX)	+= 53c700.o	zorro7xx.o
+obj-$(CONFIG_SCSI_ZORRO_ESP)	+= esp_scsi.o	zorro_esp.o
+obj-$(CONFIG_A3000_SCSI)	+= a3000.o	wd33c93.o
+obj-$(CONFIG_A2091_SCSI)	+= a2091.o	wd33c93.o
+obj-$(CONFIG_GVP11_SCSI)	+= gvp11.o	wd33c93.o
+obj-$(CONFIG_MVME147_SCSI)	+= mvme147.o	wd33c93.o
+obj-$(CONFIG_SGIWD93_SCSI)	+= sgiwd93.o	wd33c93.o
+obj-$(CONFIG_ATARI_SCSI)	+= atari_scsi.o
+obj-$(CONFIG_MAC_SCSI)		+= mac_scsi.o
+obj-$(CONFIG_SCSI_MAC_ESP)	+= esp_scsi.o	mac_esp.o
+obj-$(CONFIG_SUN3_SCSI)		+= sun3_scsi.o  sun3_scsi_vme.o
+obj-$(CONFIG_MVME16x_SCSI)	+= 53c700.o	mvme16x_scsi.o
+obj-$(CONFIG_BVME6000_SCSI)	+= 53c700.o	bvme6000_scsi.o
+obj-$(CONFIG_SCSI_SIM710)	+= 53c700.o	sim710.o
+obj-$(CONFIG_SCSI_ADVANSYS)	+= advansys.o
+obj-$(CONFIG_SCSI_BUSLOGIC)	+= BusLogic.o
+obj-$(CONFIG_SCSI_ARCMSR)	+= arcmsr/
+obj-$(CONFIG_SCSI_AHA152X)	+= aha152x.o
+obj-$(CONFIG_SCSI_AHA1542)	+= aha1542.o
+obj-$(CONFIG_SCSI_AHA1740)	+= aha1740.o
+obj-$(CONFIG_SCSI_AIC7XXX)	+= aic7xxx/
+obj-$(CONFIG_SCSI_AIC79XX)	+= aic7xxx/
+obj-$(CONFIG_SCSI_AACRAID)	+= aacraid/
+obj-$(CONFIG_SCSI_AIC94XX)	+= aic94xx/
+obj-$(CONFIG_SCSI_PM8001)	+= pm8001/
+obj-$(CONFIG_SCSI_ISCI)		+= isci/
+obj-$(CONFIG_SCSI_IPS)		+= ips.o
+obj-$(CONFIG_SCSI_FDOMAIN)	+= fdomain.o
+obj-$(CONFIG_SCSI_FDOMAIN_PCI)	+= fdomain_pci.o
+obj-$(CONFIG_SCSI_FDOMAIN_ISA)	+= fdomain_isa.o
+obj-$(CONFIG_SCSI_GENERIC_NCR5380) += g_NCR5380.o
+obj-$(CONFIG_SCSI_QLOGIC_FAS)	+= qlogicfas408.o	qlogicfas.o
+obj-$(CONFIG_PCMCIA_QLOGIC)	+= qlogicfas408.o
+obj-$(CONFIG_SCSI_QLOGIC_1280)	+= qla1280.o 
+obj-$(CONFIG_SCSI_QLA_FC)	+= qla2xxx/
+obj-$(CONFIG_SCSI_QLA_ISCSI)	+= libiscsi.o qla4xxx/
+obj-$(CONFIG_SCSI_LPFC)		+= lpfc/
+obj-$(CONFIG_SCSI_EFCT)		+= elx/
+obj-$(CONFIG_SCSI_BFA_FC)	+= bfa/
+obj-$(CONFIG_SCSI_CHELSIO_FCOE)	+= csiostor/
+obj-$(CONFIG_SCSI_DMX3191D)	+= dmx3191d.o
+obj-$(CONFIG_SCSI_HPSA)		+= hpsa.o
+obj-$(CONFIG_SCSI_LEAPRAID) += leapraid/
+obj-$(CONFIG_SCSI_SMARTPQI)	+= smartpqi/
+obj-$(CONFIG_SCSI_SYM53C8XX_2)	+= sym53c8xx_2/
+obj-$(CONFIG_SCSI_ZALON)	+= zalon7xx.o
+obj-$(CONFIG_SCSI_DC395x)	+= dc395x.o
+obj-$(CONFIG_SCSI_AM53C974)	+= esp_scsi.o	am53c974.o
+obj-$(CONFIG_MEGARAID_LEGACY)	+= megaraid.o
+obj-$(CONFIG_MEGARAID_NEWGEN)	+= megaraid/
+obj-$(CONFIG_MEGARAID_SAS)	+= megaraid/
+obj-$(CONFIG_SCSI_MPT3SAS)	+= mpt3sas/
+obj-$(CONFIG_SCSI_MPI3MR)	+= mpi3mr/
+obj-$(CONFIG_SCSI_ACARD)	+= atp870u.o
+obj-$(CONFIG_SCSI_SUNESP)	+= esp_scsi.o	sun_esp.o
+obj-$(CONFIG_SCSI_INITIO)	+= initio.o
+obj-$(CONFIG_SCSI_INIA100)	+= a100u2w.o
+obj-$(CONFIG_SCSI_QLOGICPTI)	+= qlogicpti.o
+obj-$(CONFIG_SCSI_MESH)		+= mesh.o
+obj-$(CONFIG_SCSI_MAC53C94)	+= mac53c94.o
+obj-$(CONFIG_SCSI_MYRB)		+= myrb.o
+obj-$(CONFIG_SCSI_MYRS)		+= myrs.o
+obj-$(CONFIG_BLK_DEV_3W_XXXX_RAID) += 3w-xxxx.o
+obj-$(CONFIG_SCSI_3W_9XXX)	+= 3w-9xxx.o
+obj-$(CONFIG_SCSI_3W_SAS)	+= 3w-sas.o
+obj-$(CONFIG_SCSI_PPA)		+= ppa.o
+obj-$(CONFIG_SCSI_IMM)		+= imm.o
+obj-$(CONFIG_JAZZ_ESP)		+= esp_scsi.o	jazz_esp.o
+obj-$(CONFIG_SUN3X_ESP)		+= esp_scsi.o	sun3x_esp.o
+obj-$(CONFIG_SCSI_LASI700)	+= 53c700.o lasi700.o
+obj-$(CONFIG_SCSI_SNI_53C710)	+= 53c700.o sni_53c710.o
+obj-$(CONFIG_SCSI_NSP32)	+= nsp32.o
+obj-$(CONFIG_SCSI_IPR)		+= ipr.o
+obj-$(CONFIG_SCSI_IBMVSCSI)	+= ibmvscsi/
+obj-$(CONFIG_SCSI_IBMVSCSIS)	+= ibmvscsi_tgt/
+obj-$(CONFIG_SCSI_IBMVFC)	+= ibmvscsi/
+obj-$(CONFIG_SCSI_HPTIOP)	+= hptiop.o
+obj-$(CONFIG_SCSI_STEX)		+= stex.o
+obj-$(CONFIG_SCSI_MVSAS)	+= mvsas/
+obj-$(CONFIG_SCSI_MVUMI)	+= mvumi.o
+obj-$(CONFIG_PS3_ROM)		+= ps3rom.o
+obj-$(CONFIG_SCSI_CXGB3_ISCSI)	+= libiscsi.o libiscsi_tcp.o cxgbi/
+obj-$(CONFIG_SCSI_CXGB4_ISCSI)	+= libiscsi.o libiscsi_tcp.o cxgbi/
+obj-$(CONFIG_SCSI_BNX2_ISCSI)	+= libiscsi.o bnx2i/
+obj-$(CONFIG_QEDI)          += libiscsi.o qedi/
+obj-$(CONFIG_BE2ISCSI)		+= libiscsi.o be2iscsi/
+obj-$(CONFIG_SCSI_ESAS2R)	+= esas2r/
+obj-$(CONFIG_SCSI_PMCRAID)	+= pmcraid.o
+obj-$(CONFIG_SCSI_VIRTIO)	+= virtio_scsi.o
+obj-$(CONFIG_VMWARE_PVSCSI)	+= vmw_pvscsi.o
+obj-$(CONFIG_XEN_SCSI_FRONTEND)	+= xen-scsifront.o
+obj-$(CONFIG_HYPERV_STORAGE)	+= hv_storvsc.o
+obj-$(CONFIG_SCSI_WD719X)	+= wd719x.o
+
+obj-$(CONFIG_ARM)		+= arm/
+
+obj-$(CONFIG_CHR_DEV_ST)	+= st.o
+obj-$(CONFIG_BLK_DEV_SD)	+= sd_mod.o
+obj-$(CONFIG_BLK_DEV_SR)	+= sr_mod.o
+obj-$(CONFIG_CHR_DEV_SG)	+= sg.o
+obj-$(CONFIG_CHR_DEV_SCH)	+= ch.o
+obj-$(CONFIG_SCSI_ENCLOSURE)	+= ses.o
+
+obj-$(CONFIG_SCSI_HISI_SAS) += hisi_sas/
+
+# This goes last, so that "real" scsi devices probe earlier
+obj-$(CONFIG_SCSI_DEBUG)	+= scsi_debug.o
+scsi_mod-y			+= scsi.o hosts.o scsi_ioctl.o \
+				   scsicam.o scsi_error.o scsi_lib.o
+scsi_mod-$(CONFIG_SCSI_CONSTANTS) += constants.o
+scsi_mod-$(CONFIG_SCSI_DMA)	+= scsi_lib_dma.o
+scsi_mod-y			+= scsi_scan.o scsi_sysfs.o scsi_devinfo.o
+scsi_mod-$(CONFIG_SCSI_NETLINK)	+= scsi_netlink.o
+scsi_mod-$(CONFIG_SYSCTL)	+= scsi_sysctl.o
+scsi_mod-$(CONFIG_SCSI_PROC_FS)	+= scsi_proc.o
+scsi_mod-$(CONFIG_BLK_DEBUG_FS)	+= scsi_debugfs.o
+scsi_mod-y			+= scsi_trace.o scsi_logging.o
+scsi_mod-$(CONFIG_PM)		+= scsi_pm.o
+scsi_mod-$(CONFIG_SCSI_DH)	+= scsi_dh.o
+scsi_mod-$(CONFIG_BLK_DEV_BSG)	+= scsi_bsg.o
+
+hv_storvsc-y			:= storvsc_drv.o
+
+sd_mod-objs	:= sd.o
+sd_mod-$(CONFIG_BLK_DEV_INTEGRITY) += sd_dif.o
+sd_mod-$(CONFIG_BLK_DEV_ZONED) += sd_zbc.o
+
+sr_mod-objs	:= sr.o sr_ioctl.o sr_vendor.o
+ncr53c8xx-flags-$(CONFIG_SCSI_ZALON) \
+		:= -DNCR53C8XX_PREFETCH -DSCSI_NCR_BIG_ENDIAN \
+			-DSCSI_NCR53C8XX_NO_WORD_TRANSFERS
+CFLAGS_ncr53c8xx.o	:= $(ncr53c8xx-flags-y) $(ncr53c8xx-flags-m)
+zalon7xx-objs	:= zalon.o ncr53c8xx.o
+
+# Files generated that shall be removed upon make clean
+clean-files :=	53c700_d.h 53c700_u.h
+
+$(obj)/53c700.o: $(obj)/53c700_d.h
+
+$(obj)/scsi_sysfs.o: $(obj)/scsi_devinfo_tbl.c
+
+quiet_cmd_bflags = GEN     $@
+	cmd_bflags = sed -n 's/.*define *BLIST_\([A-Z0-9_]*\) *.*/BLIST_FLAG_NAME(\1),/p' $< > $@
+
+$(obj)/scsi_devinfo_tbl.c: include/scsi/scsi_devinfo.h FORCE
+	$(call if_changed,bflags)
+
+targets +=  scsi_devinfo_tbl.c
+
+# If you want to play with the firmware, uncomment
+# GENERATE_FIRMWARE := 1
+
+ifdef GENERATE_FIRMWARE
+
+$(obj)/53c700_d.h: $(src)/53c700.scr $(src)/script_asm.pl
+	$(PERL) -s $(src)/script_asm.pl -ncr7x0_family $@ $(@:_d.h=_u.h) < $<
+
+endif