KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted

Manually perform cache maintenance on the source VM during intra-host
migration to ensure no stale data is left in CPU caches after the VM is
destroyed.  Because the source VM is "converted" to a non-SEV VM, KVM's
memory reclaim flows won't trigger cache maintenance, e.g. when all guest
memory is reclaimed in response to detaching from the mmu_notifier.

Note, relying on the destination VM to do cache maintenance isn't an option
as KVM doesn't require identical guest memory configurations, i.e. the
source VM may have access to memory that the destination VM does not.
Enforcing equivalent memory configurations is infeasible, as it would
require a *deep* comparison of memslots, e.g. to verify that not only are
the memslot identical, but what the memslots point at is also identical.

Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration")
Cc: stable@vger.kernel.org
Reported-by: Stefan Teodorescu <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.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