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 --- scripts/bash-completion/make | 451 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 451 insertions(+) create mode 100644 scripts/bash-completion/make (limited to 'scripts/bash-completion') diff --git a/scripts/bash-completion/make b/scripts/bash-completion/make new file mode 100644 index 000000000..42e8dcead --- /dev/null +++ b/scripts/bash-completion/make @@ -0,0 +1,451 @@ +# SPDX-License-Identifier: GPL-2.0-only +# bash completion for GNU make with kbuild extension -*- shell-script -*- + +# Load the default completion script for make. It is typically located at +# /usr/share/bash-completion/completions/make, but we do not rely on it. +__kbuild_load_default_make_completion() +{ + local -a dirs=("${BASH_COMPLETION_USER_DIR:-${XDG_DATA_HOME:-$HOME/.local/share}/bash-completion}/completions") + local ifs=$IFS IFS=: dir compfile this_dir + + for dir in ${XDG_DATA_DIRS:-/usr/local/share:/usr/share}; do + dirs+=("$dir"/bash-completion/completions) + done + IFS=$ifs + + this_dir="$(realpath "$(dirname "${BASH_SOURCE[0]}")")" + + for dir in "${dirs[@]}"; do + if [[ ! -d ${dir} || ${dir} = "${this_dir}" ]]; then + continue + fi + + for compfile in make make.bash _make; do + compfile=$dir/$compfile + # Avoid trying to source dirs; https://bugzilla.redhat.com/903540 + if [[ -f ${compfile} ]] && . "${compfile}" &>/dev/null; then + + __kbuild_default_make_completion=$( + # shellcheck disable=SC2046 # word splitting is the point here + set -- $(complete -p make) + + while [[ $# -gt 1 && "$1" != -F ]]; do + shift + done + + if [[ "$1" = -F ]]; then + echo "$2" + fi + ) + + return + fi + done + done +} + +__kbuild_load_default_make_completion + +__kbuild_handle_variable() +{ + local var=${1%%=*} + local cur=${cur#"${var}"=} + local srctree=$2 + local keywords=() + + case $var in + ARCH) + # sub-directories under arch/ + keywords+=($(find "${srctree}/arch" -mindepth 1 -maxdepth 1 -type d -printf '%P\n')) + # architectures hard-coded in the top Makefile + keywords+=(i386 x86_64 sparc32 sparc64 parisc64) + ;; + CROSS_COMPILE) + # toolchains with a full path + local cross_compile=() + local c c2 + _filedir + + for c in "${COMPREPLY[@]}"; do + # eval for tilde expansion + # suppress error, as this fails when it contains a space + eval "c2=${c}" 2>/dev/null || continue + if [[ ${c} == *-elfedit && ! -d ${c2} && -x ${c2} ]]; then + cross_compile+=("${c%elfedit}") + fi + done + + # toolchains in the PATH environment + while read -r c; do + if [[ ${c} == *-elfedit ]]; then + keywords+=("${c%elfedit}") + fi + done < <(compgen -c) + + COMPREPLY=() + _filedir -d + + # Add cross_compile directly without passing it to compgen. + # Otherwise, toolchain paths with a tilde do not work. + # e.g.) + # CROSS_COMPILE=~/0day/gcc-14.2.0-nolibc/aarch64-linux/bin/aarch64-linux- + COMPREPLY+=("${cross_compile[@]}") + ;; + LLVM) + # LLVM=1 uses the default 'clang' etc. + keywords+=(1) + + # suffix for a particular version. LLVM=-18 uses 'clang-18' etc. + while read -r c; do + if [[ ${c} == clang-[0-9]* ]]; then + keywords+=("${c#clang}") + fi + done < <(compgen -c) + + # directory path to LLVM toolchains + _filedir -d + ;; + KCONFIG_ALLCONFIG) + # KCONFIG_ALLCONFIG=1 selects the default fragment + keywords+=(1) + # or the path to a fragment file + _filedir + ;; + C | KBUILD_CHECKSRC) + keywords+=(1 2) + ;; + V | KBUILD_VERBOSE) + keywords+=({,1}{,2}) + ;; + W | KBUILD_EXTRA_WARN) + keywords+=({,1}{,2}{,3}{,c}{,e}) + ;; + KBUILD_ABS_SRCTREE | KBUILD_MODPOST_NOFINAL | KBUILD_MODPOST_WARN | \ + CLIPPY | KBUILD_CLIPPY | KCONFIG_NOSILENTUPDATE | \ + KCONFIG_OVERWRITECONFIG | KCONFIG_WARN_UNKNOWN_SYMBOL | \ + KCONFIG_WERROR ) + keywords+=(1) + ;; + INSTALL_MOD_STRIP) + keywords+=(1 --strip-debug --strip-unneeded) + ;; + O | KBUILD_OUTPUT | M | KBUILD_EXTMOD | MO | KBUILD_EXTMOD_OUTPUT | *_PATH) + # variables that take a directory. + _filedir -d + return + ;; + KBUILD_EXTRA_SYMBOL | KBUILD_KCONFIG | KCONFIG_CONFIG) + # variables that take a file. + _filedir + return + esac + + COMPREPLY+=($(compgen -W "${keywords[*]}" -- "${cur}")) +} + +# Check the -C, -f options and 'source' symlink. Return the source tree we are +# working in. +__kbuild_get_srctree() +{ + local words=("$@") + local cwd makef_dir + + # see if a path was specified with -C/--directory + for ((i = 1; i < ${#words[@]}; i++)); do + if [[ ${words[i]} == -@(C|-directory) ]]; then + # eval for tilde expansion. + # suppress error, as this fails when it contains a space + eval "cwd=${words[i + 1]}" 2>/dev/null + break + fi + done + + if [[ -z ${cwd} ]]; then + cwd=. + fi + + # see if a Makefile was specified with -f/--file/--makefile + for ((i = 1; i < ${#words[@]}; i++)); do + if [[ ${words[i]} == -@(f|-?(make)file) ]]; then + # eval for tilde expansion + # suppress error, as this fails when it contains a space + eval "makef_dir=${words[i + 1]%/*}" 2>/dev/null + break + fi + done + + if [ -z "${makef_dir}" ]; then + makef_dir=${cwd} + elif [[ ${makef_dir} != /* ]]; then + makef_dir=${cwd}/${makef_dir} + fi + + # If ${makef_dir} is a build directory created by the O= option, there + # is a symbolic link 'source', which points to the kernel source tree. + if [[ -L ${makef_dir}/source ]]; then + makef_dir=$(readlink "${makef_dir}/source") + fi + + echo "${makef_dir}" +} + +# Get SRCARCH to do a little more clever things +__kbuild_get_srcarch() +{ + local words=("$@") + local arch srcarch uname_m + + # see if ARCH= is explicitly specified + for ((i = 1; i < ${#words[@]}; i++)); do + if [[ ${words[i]} == ARCH=* ]]; then + arch=${words[i]#ARCH=} + break + fi + done + + # If ARCH= is not specified, check the build marchine's architecture + if [[ -z ${arch} ]]; then + uname_m=$(uname -m) + + # shellcheck disable=SC2209 # 'sh' is SuperH, not a shell command + case ${uname_m} in + arm64 | aarch64*) arch=arm64 ;; + arm* | sa110) arch=arm ;; + i?86 | x86_64) arch=x86 ;; + loongarch*) arch=loongarch ;; + mips*) arch=mips ;; + ppc*) arch=powerpc ;; + riscv*) arch=riscv ;; + s390x) arch=s390 ;; + sh[234]*) arch=sh ;; + sun4u) arch=sparc64 ;; + *) arch=${uname_m} ;; + esac + fi + + case ${arch} in + parisc64) srcarch=parisc ;; + sparc32 | sparc64) srcarch=sparc ;; + i386 | x86_64) srcarch=x86 ;; + *) srcarch=${arch} ;; + esac + + echo "$srcarch" +} + +# small Makefile to parse obj-* syntax +__kbuild_tmp_makefile() +{ +cat <<'EOF' +.PHONY: __default +__default: + $(foreach m,$(obj-y) $(obj-m) $(obj-),$(foreach s, -objs -y -m -,$($(m:%.o=%$s))) $(m)) +EOF +echo "include ${1}" +} + +_make_for_kbuild () +{ + # shellcheck disable=SC2034 # these are set by _init_completion + local cur prev words cword split + _init_completion -s || return + + local srctree + srctree=$(__kbuild_get_srctree "${words[@]}") + + # If 'kernel' and 'Documentation' directories are found, we assume this + # is a kernel tree. Otherwise, we fall back to the generic rule provided + # by the bash-completion project. + if [[ ! -d ${srctree}/kernel || ! -d ${srctree}/Documentation ]]; then + if [ -n "${__kbuild_default_make_completion}" ]; then + "${__kbuild_default_make_completion}" "$@" + fi + return + fi + + # make options with a parameter (copied from the bash-completion project) + case ${prev} in + --file | --makefile | --old-file | --assume-old | --what-if | --new-file | \ + --assume-new | -!(-*)[foW]) + _filedir + return + ;; + --include-dir | --directory | -!(-*)[ICm]) + _filedir -d + return + ;; + -!(-*)E) + COMPREPLY=($(compgen -v -- "$cur")) + return + ;; + --eval | -!(-*)[DVx]) + return + ;; + --jobs | -!(-*)j) + COMPREPLY=($(compgen -W "{1..$(($(_ncpus) * 2))}" -- "$cur")) + return + ;; + esac + + local keywords=() + + case ${cur} in + -*) + # make options (copied from the bash-completion project) + local opts + opts="$(_parse_help "$1")" + COMPREPLY=($(compgen -W "${opts:-$(_parse_usage "$1")}" -- "$cur")) + if [[ ${COMPREPLY-} == *= ]]; then + compopt -o nospace + fi + return + ;; + *=*) + __kbuild_handle_variable "${cur}" "${srctree}" + return + ;; + KBUILD_*) + # There are many variables prefixed with 'KBUILD_'. + # Display them only when 'KBUILD_' is entered. + # shellcheck disable=SC2191 # '=' is appended for variables + keywords+=( + KBUILD_{CHECKSRC,EXTMOD,EXTMOD_OUTPUT,OUTPUT,VERBOSE,EXTRA_WARN,CLIPPY}= + KBUILD_BUILD_{USER,HOST,TIMESTAMP}= + KBUILD_MODPOST_{NOFINAL,WARN}= + KBUILD_{ABS_SRCTREE,EXTRA_SYMBOLS,KCONFIG}= + ) + ;; + KCONFIG_*) + # There are many variables prefixed with 'KCONFIG_'. + # Display them only when 'KCONFIG_' is entered. + # shellcheck disable=SC2191 # '=' is appended for variables + keywords+=( + KCONFIG_{CONFIG,ALLCONFIG,NOSILENTUPDATE,OVERWRITECONFIG}= + KCONFIG_{SEED,PROBABILITY}= + KCONFIG_WARN_UNKNOWN_SYMBOL= + KCONFIG_WERROR= + ) + ;; + *) + # By default, hide KBUILD_* and KCONFIG_* variables. + # Instead, display only the prefix parts. + keywords+=(KBUILD_ KCONFIG_) + ;; + esac + + if [[ ${cur} != /* && ${cur} != *//* ]]; then + local dir srcarch kbuild_file tmp + srcarch=$(__kbuild_get_srcarch "${words[@]}") + + # single build + dir=${cur} + while true; do + if [[ ${dir} == */* ]]; then + dir=${dir%/*} + else + dir=. + fi + + # Search for 'Kbuild' or 'Makefile' in the parent + # directories (may not be a direct parent) + if [[ -f ${srctree}/${dir}/Kbuild ]]; then + kbuild_file=${srctree}/${dir}/Kbuild + break + fi + if [[ -f ${srctree}/${dir}/Makefile ]]; then + kbuild_file=${srctree}/${dir}/Makefile + break + fi + + if [[ ${dir} == . ]]; then + break + fi + done + + if [[ -n ${kbuild_file} ]]; then + tmp=($(__kbuild_tmp_makefile "${kbuild_file}" | + SRCARCH=${srcarch} obj=${dir} src=${srctree}/${dir} \ + "${1}" -n -f - 2>/dev/null)) + + # Add $(obj)/ prefix + if [[ ${dir} != . ]]; then + tmp=("${tmp[@]/#/${dir}\/}") + fi + + keywords+=("${tmp[@]}") + fi + + # *_defconfig and *.config files. These might be grouped into + # subdirectories, e.g., arch/powerpc/configs/*/*_defconfig. + if [[ ${cur} == */* ]]; then + dir=${cur%/*} + else + dir=. + fi + + tmp=($(find "${srctree}/arch/${srcarch}/configs/${dir}" \ + "${srctree}/kernel/configs/${dir}" \ + -mindepth 1 -maxdepth 1 -type d -printf '%P/\n' \ + -o -printf '%P\n' 2>/dev/null)) + + if [[ ${dir} != . ]]; then + tmp=("${tmp[@]/#/${dir}\/}") + fi + + keywords+=("${tmp[@]}") + fi + + # shellcheck disable=SC2191 # '=' is appended for variables + keywords+=( + # + # variables (append =) + # + ARCH= + CROSS_COMPILE= + LLVM= + C= M= MO= O= V= W= + INSTALL{,_MOD,_HDR,_DTBS}_PATH= + KERNELRELEASE= + + # + # targets + # + all help + clean mrproper distclean + clang-{tidy,analyzer} compile_commands.json + coccicheck + dtbs{,_check,_install} dt_binding_{check,schemas} + headers{,_install} + vmlinux install + modules{,_prepare,_install,_sign} + vdso_install + tags TAGS cscope gtags + rust{available,fmt,fmtcheck} + kernel{version,release} image_name + kselftest{,-all,-install,-clean,-merge} + + # configuration + {,old,olddef,sync,def,savedef,rand,listnew,helpnew,test,tiny}config + {,build_}{menu,n,g,x}config + local{mod,yes}config + all{no,yes,mod,def}config + {yes2mod,mod2yes,mod2no}config + + # docs + {html,textinfo,info,latex,pdf,epub,xml,linkcheck,refcheck,clean}docs + + # package + {,bin,src}{rpm,deb}-pkg + {pacman,dir,tar}-pkg + tar{,gz,bz2,xz,zst}-pkg + perf-tar{,gz,bz2,xz,zst}-src-pkg + ) + + COMPREPLY=($(compgen -W "${keywords[*]}" -- "${cur}")) + + # Do not append a space for variables, subdirs, "KBUILD_", "KCONFIG_". + if [[ ${COMPREPLY-} == *[=/] || ${COMPREPLY-} =~ ^(KBUILD|KCONFIG)_$ ]]; then + compopt -o nospace + fi + +} && complete -F _make_for_kbuild make -- cgit v1.3.1