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/microblaze/Makefile | 93 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 arch/microblaze/Makefile (limited to 'arch/microblaze/Makefile') diff --git a/arch/microblaze/Makefile b/arch/microblaze/Makefile new file mode 100644 index 000000000..02e6be9c5 --- /dev/null +++ b/arch/microblaze/Makefile @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: GPL-2.0 +KBUILD_DEFCONFIG := mmu_defconfig + +UTS_SYSNAME = -DUTS_SYSNAME=\"Linux\" + +# What CPU version are we building for, and crack it open +# as major.minor.rev +CPU_VER := $(CONFIG_XILINX_MICROBLAZE0_HW_VER) +CPU_MAJOR := $(word 1, $(subst ., , $(CPU_VER))) +CPU_MINOR := $(word 2, $(subst ., , $(CPU_VER))) +CPU_REV := $(word 3, $(subst ., , $(CPU_VER))) + +export CPU_VER CPU_MAJOR CPU_MINOR CPU_REV + +# Use cpu-related CONFIG_ vars to set compile options. +# The various CONFIG_XILINX cpu features options are integers 0/1/2... +# rather than bools y/n + +# Work out HW multipler support. This is tricky. +# 1. Spartan2 has no HW multipliers. +# 2. MicroBlaze v3.x always uses them, except in Spartan 2 +# 3. All other FPGa/CPU ver combos, we can trust the CONFIG_ settings +ifeq (,$(findstring spartan2,$(CONFIG_XILINX_MICROBLAZE0_FAMILY))) + ifeq ($(CPU_MAJOR),3) + CPUFLAGS-1 += -mno-xl-soft-mul + else + # USE_HW_MUL can be 0, 1, or 2, defining a hierarchy of HW Mul support. + CPUFLAGS-$(subst 1,,$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL)) += -mxl-multiply-high + CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL) += -mno-xl-soft-mul + endif +endif +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_DIV) += -mno-xl-soft-div +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_BARREL) += -mxl-barrel-shift +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR) += -mxl-pattern-compare + +ifdef CONFIG_CPU_BIG_ENDIAN +KBUILD_CFLAGS += -mbig-endian +KBUILD_AFLAGS += -mbig-endian +KBUILD_LDFLAGS += -EB +else +KBUILD_CFLAGS += -mlittle-endian +KBUILD_AFLAGS += -mlittle-endian +KBUILD_LDFLAGS += -EL +endif + +CPUFLAGS-1 += $(call cc-option,-mcpu=v$(CPU_VER)) + +# r31 holds current when in kernel mode +KBUILD_CFLAGS += -ffixed-r31 $(CPUFLAGS-y) $(CPUFLAGS-1) $(CPUFLAGS-2) + +libs-y += arch/microblaze/lib/ + +boot := arch/microblaze/boot + +# Are we making a simpleImage. target? If so, crack out the boardname +DTB:=$(subst simpleImage.,,$(filter simpleImage.%, $(MAKECMDGOALS))) + +export DTB + +all: linux.bin + +archheaders: + $(Q)$(MAKE) $(build)=arch/microblaze/kernel/syscalls all + +PHONY += linux.bin linux.bin.gz linux.bin.ub +linux.bin.ub linux.bin.gz: linux.bin +linux.bin: vmlinux +linux.bin linux.bin.gz linux.bin.ub: + $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ + @echo 'Kernel: $(boot)/$@ is ready' ' (#'$(or $(KBUILD_BUILD_VERSION),`cat .version`)')' + +PHONY += simpleImage.$(DTB) +simpleImage.$(DTB): vmlinux + $(Q)$(MAKE) $(build)=$(boot) $(addprefix $(boot)/$@., ub unstrip strip) + @echo 'Kernel: $(boot)/$@ is ready' ' (#'$(or $(KBUILD_BUILD_VERSION),`cat .version`)')' + +define archhelp + echo '* linux.bin - Create raw binary' + echo ' linux.bin.gz - Create compressed raw binary' + echo ' linux.bin.ub - Create U-Boot wrapped raw binary' + echo ' simpleImage.
- Create the following images with
.dtb linked in' + echo ' simpleImage.
: raw image' + echo ' simpleImage.
.ub : raw image with U-Boot header' + echo ' simpleImage.
.unstrip: ELF (identical to vmlinux)' + echo ' simpleImage.
.strip : stripped ELF' + echo ' Targets with
embed a device tree blob inside the image' + echo ' These targets support board with firmware that does not' + echo ' support passing a device tree directly. Replace
with the' + echo ' name of a dts file from the arch/microblaze/boot/dts/ directory' + echo ' (minus the .dts extension).' +endef + +MRPROPER_FILES += $(boot)/simpleImage.* -- cgit v1.3.1