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 --- Documentation/devicetree/bindings/Makefile | 103 +++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 Documentation/devicetree/bindings/Makefile (limited to 'Documentation/devicetree/bindings/Makefile') diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile new file mode 100644 index 000000000..6b4b4f51c --- /dev/null +++ b/Documentation/devicetree/bindings/Makefile @@ -0,0 +1,103 @@ +# SPDX-License-Identifier: GPL-2.0 +DT_DOC_CHECKER ?= dt-doc-validate +DT_EXTRACT_EX ?= dt-extract-example +DT_MK_SCHEMA ?= dt-mk-schema + +DT_SCHEMA_LINT = $(shell which yamllint || \ + echo "warning: python package 'yamllint' not installed, skipping" >&2) + +DT_SCHEMA_MIN_VERSION = 2024.4 + +PHONY += check_dtschema_version +check_dtschema_version: + @which $(DT_DOC_CHECKER) >/dev/null || \ + { echo "Error: '$(DT_DOC_CHECKER)' not found!" >&2; \ + echo "Ensure dtschema python package is installed and in your PATH." >&2; \ + echo "Current PATH is:" >&2; \ + echo "$$PATH" >&2; false; } + @{ echo $(DT_SCHEMA_MIN_VERSION); \ + $(DT_DOC_CHECKER) --version 2>/dev/null || echo 0; } | sort -Vc >/dev/null || \ + { echo "ERROR: dtschema minimum version is v$(DT_SCHEMA_MIN_VERSION)" >&2; false; } + +quiet_cmd_extract_ex = DTEX $@ + cmd_extract_ex = $(DT_EXTRACT_EX) $< > $@ + +$(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE + $(call if_changed,extract_ex) + +find_all_cmd = find $(src) \( -name '*.yaml' ! \ + -name 'processed-schema*' \) + +find_cmd = $(find_all_cmd) | \ + sed 's|^$(srctree)/||' | \ + grep -F -e "$(subst :," -e ",$(DT_SCHEMA_FILES))" | \ + sed 's|^|$(srctree)/|' +CHK_DT_EXAMPLES := $(patsubst $(srctree)/%.yaml,%.example.dtb, \ + $(shell $(find_cmd) | xargs grep -l '^examples:')) + +quiet_cmd_yamllint = LINT $(src) + cmd_yamllint = ($(find_cmd) | \ + xargs -n200 -P$$(nproc) \ + $(DT_SCHEMA_LINT) -f parsable -c $(src)/.yamllint >&2) \ + && touch $@ || true + +quiet_cmd_chk_bindings = CHKDT $(src) + cmd_chk_bindings = ($(find_cmd) | \ + xargs -n200 -P$$(nproc) $(DT_DOC_CHECKER) -u $(src)) \ + && touch $@ || true + +DT_CHK_STYLE = $(srctree)/scripts/dtc/dt-check-style + +# Feed the file list to the checker via @argfile in a single Python +# process so the ruamel.yaml import is paid once. scripts/jobserver-exec +# claims slots from the GNU make jobserver and exposes the count via +# $PARALLELISM, which dt-check-style picks up to size its worker pool. +quiet_cmd_chk_style = STYLE $(src) + cmd_chk_style = f=$$(mktemp) && $(find_cmd) > $$f && \ + $(PYTHON3) $(srctree)/scripts/jobserver-exec \ + $(PYTHON3) $(DT_CHK_STYLE) @$$f \ + && touch $@ || true; rm -f $$f + +quiet_cmd_mk_schema = SCHEMA $@ + cmd_mk_schema = f=$$(mktemp) ; \ + $(find_all_cmd) > $$f ; \ + $(DT_MK_SCHEMA) -j $(DT_MK_SCHEMA_FLAGS) @$$f > $@ ; \ + rm -f $$f + +DT_DOCS = $(patsubst $(srctree)/%,%,$(shell $(find_all_cmd))) + +override DTC_FLAGS := \ + -Wno-avoid_unnecessary_addr_size \ + -Wno-unique_unit_address \ + -Wunique_unit_address_if_enabled + +$(obj)/processed-schema.json: $(DT_DOCS) check_dtschema_version FORCE + $(call if_changed,mk_schema) + +targets += .dt-binding.checked .yamllint.checked .dt-style.checked +$(obj)/.yamllint.checked: $(DT_DOCS) $(src)/.yamllint FORCE + $(if $(DT_SCHEMA_LINT),$(call if_changed,yamllint),) + +$(obj)/.dt-binding.checked: $(DT_DOCS) FORCE + $(call if_changed,chk_bindings) + +$(obj)/.dt-style.checked: $(DT_DOCS) FORCE + $(call if_changed,chk_style) + +always-y += processed-schema.json +targets += $(patsubst $(obj)/%,%, $(CHK_DT_EXAMPLES)) +targets += $(patsubst $(obj)/%.dtb,%.dts, $(CHK_DT_EXAMPLES)) + +# Hack: avoid 'Argument list too long' error for 'make clean'. Remove most of +# build artifacts here before they are processed by scripts/Makefile.clean +clean-files = $(shell find $(obj) \( -name '*.example.dts' -o \ + -name '*.example.dtb' \) -delete 2>/dev/null) + +dt_compatible_check: $(obj)/processed-schema.json + $(Q)$(srctree)/scripts/dtc/dt-extract-compatibles $(srctree) | xargs dt-check-compatible -v -s $< + +PHONY += dt_binding_check_one +dt_binding_check_one: $(obj)/.dt-binding.checked $(obj)/.yamllint.checked $(obj)/.dt-style.checked + +PHONY += dt_binding_check +dt_binding_check: dt_binding_check_one $(CHK_DT_EXAMPLES) -- cgit v1.3.1