From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration 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 Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- arch/arm/boot/Makefile | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 arch/arm/boot/Makefile (limited to 'arch/arm/boot/Makefile') diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile new file mode 100644 index 000000000..ba9b9a802 --- /dev/null +++ b/arch/arm/boot/Makefile @@ -0,0 +1,92 @@ +# +# arch/arm/boot/Makefile +# +# This file is included by the global makefile so that you can add your own +# architecture-specific flags and dependencies. +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# +# Copyright (C) 1995-2002 Russell King +# +OBJCOPYFLAGS :=-O binary -R .comment -S + +# ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET) +ifdef CONFIG_PHYS_OFFSET +add_hex = $(shell printf 0x%x $$(( $(1) + $(2) )) ) +ZRELADDR := $(call add_hex, $(CONFIG_PHYS_OFFSET), $(TEXT_OFFSET)) +endif + +PHYS_OFFSET := $(CONFIG_PHYS_OFFSET) +export ZRELADDR PARAMS_PHYS PHYS_OFFSET + +targets := Image zImage xipImage bootpImage uImage + +ifeq ($(CONFIG_XIP_KERNEL),y) + +cmd_deflate_xip_data = $(CONFIG_SHELL) -c '$(src)/deflate_xip_data.sh $< $@' + +ifeq ($(CONFIG_XIP_DEFLATED_DATA),y) +quiet_cmd_mkxip = XIPZ $@ +cmd_mkxip = $(cmd_objcopy) && $(cmd_deflate_xip_data) +else +quiet_cmd_mkxip = $(quiet_cmd_objcopy) +cmd_mkxip = $(cmd_objcopy) +endif + +$(obj)/xipImage: vmlinux FORCE + $(call if_changed,mkxip) + @$(kecho) ' Physical Address of xipImage: $(CONFIG_XIP_PHYS_ADDR)' + +$(obj)/Image $(obj)/zImage: FORCE + @echo 'Kernel configured for XIP (CONFIG_XIP_KERNEL=y)' + @echo 'Only the xipImage target is available in this case' + @false + +else + +$(obj)/xipImage: FORCE + @echo 'Kernel not configured for XIP (CONFIG_XIP_KERNEL!=y)' + @false + +$(obj)/Image: vmlinux FORCE + $(call if_changed,objcopy) + +$(obj)/compressed/vmlinux: $(obj)/Image FORCE + $(Q)$(MAKE) $(build)=$(obj)/compressed $@ + +$(obj)/zImage: $(obj)/compressed/vmlinux FORCE + $(call if_changed,objcopy) + +endif + +ifneq ($(LOADADDR),) + UIMAGE_LOADADDR=$(LOADADDR) +else + ifeq ($(CONFIG_ZBOOT_ROM),y) + UIMAGE_LOADADDR=$(CONFIG_ZBOOT_ROM_TEXT) + else + UIMAGE_LOADADDR=$(ZRELADDR) + endif +endif + +check_for_multiple_loadaddr = \ +if [ $(words $(UIMAGE_LOADADDR)) -ne 1 ]; then \ + echo 'multiple (or no) load addresses: $(UIMAGE_LOADADDR)'; \ + echo 'This is incompatible with uImages'; \ + echo 'Specify LOADADDR on the commandline to build an uImage'; \ + false; \ +fi + +$(obj)/uImage: $(obj)/zImage FORCE + @$(check_for_multiple_loadaddr) + $(call if_changed,uimage) + +$(obj)/bootp/bootp: $(obj)/zImage FORCE + $(Q)$(MAKE) $(build)=$(obj)/bootp $@ + +$(obj)/bootpImage: $(obj)/bootp/bootp FORCE + $(call if_changed,objcopy) + +subdir- := bootp compressed dts -- cgit v1.3.1