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/generate_rust_analyzer.py | 408 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 408 insertions(+) create mode 100755 scripts/generate_rust_analyzer.py (limited to 'scripts/generate_rust_analyzer.py') diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py new file mode 100755 index 000000000..dc1219736 --- /dev/null +++ b/scripts/generate_rust_analyzer.py @@ -0,0 +1,408 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +"""generate_rust_analyzer - Generates the `rust-project.json` file for `rust-analyzer`. +""" + +import argparse +import json +import logging +import os +import pathlib +import subprocess +import sys +from typing import Dict, Iterable, List, Literal, Optional, TypedDict + +def invoke_rustc(args: List[str]) -> str: + return subprocess.check_output( + [os.environ["RUSTC"]] + args, + stdin=subprocess.DEVNULL, + ).decode('utf-8').strip() + +def args_crates_cfgs(cfgs: List[str]) -> Dict[str, List[str]]: + crates_cfgs = {} + for cfg in cfgs: + crate, vals = cfg.split("=", 1) + crates_cfgs[crate] = vals.split() + + return crates_cfgs + +def args_crates_envs(envs: List[str]) -> Dict[str, Dict[str, str]]: + crates_envs = {} + for env in envs: + crate, vals = env.split("=", 1) + crates_envs[crate] = dict(v.split("=", 1) for v in vals.split()) + + return crates_envs + +class Dependency(TypedDict): + crate: int + name: str + + +class Source(TypedDict): + include_dirs: List[str] + exclude_dirs: List[str] + + +class Crate(TypedDict): + display_name: str + root_module: str + is_workspace_member: bool + deps: List[Dependency] + cfg: List[str] + edition: str + env: Dict[str, str] + + +class ProcMacroCrate(Crate): + is_proc_macro: Literal[True] + proc_macro_dylib_path: str # `pathlib.Path` is not JSON serializable. + + +class CrateWithGenerated(Crate): + source: Source + + +def generate_crates( + srctree: pathlib.Path, + objtree: pathlib.Path, + sysroot_src: pathlib.Path, + external_src: Optional[pathlib.Path], + cfgs: List[str], + envs: List[str], + core_edition: str, +) -> List[Crate]: + # Generate the configuration list. + generated_cfg = [] + with open(objtree / "include" / "generated" / "rustc_cfg") as fd: + for line in fd: + line = line.replace("--cfg=", "") + line = line.replace("\n", "") + generated_cfg.append(line) + + # Now fill the crates list. + crates: List[Crate] = [] + crates_cfgs = args_crates_cfgs(cfgs) + crates_envs = args_crates_envs(envs) + + def get_crate_name(path: pathlib.Path) -> str: + return invoke_rustc(["--print", "crate-name", str(path)]) + + def build_crate( + display_name: str, + root_module: pathlib.Path, + deps: List[Dependency], + *, + cfg: Optional[List[str]], + is_workspace_member: Optional[bool], + edition: Optional[str], + ) -> Crate: + cfg = cfg if cfg is not None else crates_cfgs.get(display_name, []) + is_workspace_member = ( + is_workspace_member if is_workspace_member is not None else True + ) + edition = edition if edition is not None else "2021" + crate_env = { + "RUST_MODFILE": "This is only for rust-analyzer", + **crates_envs.get(display_name, {}), + } + return { + "display_name": display_name, + "root_module": str(root_module), + "is_workspace_member": is_workspace_member, + "deps": deps, + "cfg": cfg, + "edition": edition, + "env": crate_env, + } + + def append_proc_macro_crate( + display_name: str, + root_module: pathlib.Path, + deps: List[Dependency], + *, + cfg: Optional[List[str]] = None, + is_workspace_member: Optional[bool] = None, + edition: Optional[str] = None, + ) -> Dependency: + crate = build_crate( + display_name, + root_module, + deps, + cfg=cfg, + is_workspace_member=is_workspace_member, + edition=edition, + ) + proc_macro_dylib_name = invoke_rustc([ + "--print", + "file-names", + "--crate-name", + display_name, + "--crate-type", + "proc-macro", + "-", + ]) + proc_macro_crate: ProcMacroCrate = { + **crate, + "is_proc_macro": True, + "proc_macro_dylib_path": str(objtree / "rust" / proc_macro_dylib_name), + } + return register_crate(proc_macro_crate) + + def register_crate(crate: Crate) -> Dependency: + index = len(crates) + crates.append(crate) + return {"crate": index, "name": crate["display_name"]} + + def append_crate( + display_name: str, + root_module: pathlib.Path, + deps: List[Dependency], + *, + cfg: Optional[List[str]] = None, + is_workspace_member: Optional[bool] = None, + edition: Optional[str] = None, + ) -> Dependency: + return register_crate( + build_crate( + display_name, + root_module, + deps, + cfg=cfg, + is_workspace_member=is_workspace_member, + edition=edition, + ) + ) + + def append_sysroot_crate( + display_name: str, + deps: List[Dependency], + *, + cfg: Optional[List[str]] = None, + ) -> Dependency: + return append_crate( + display_name, + sysroot_src / display_name / "src" / "lib.rs", + deps, + cfg=cfg, + is_workspace_member=False, + # Miguel Ojeda writes: + # + # > ... in principle even the sysroot crates may have different + # > editions. + # > + # > For instance, in the move to 2024, it seems all happened at once + # > in 1.87.0 in these upstream commits: + # > + # > 0e071c2c6a58 ("Migrate core to Rust 2024") + # > f505d4e8e380 ("Migrate alloc to Rust 2024") + # > 0b2489c226c3 ("Migrate proc_macro to Rust 2024") + # > 993359e70112 ("Migrate std to Rust 2024") + # > + # > But in the previous move to 2021, `std` moved in 1.59.0, while + # > the others in 1.60.0: + # > + # > b656384d8398 ("Update stdlib to the 2021 edition") + # > 06a1c14d52a8 ("Switch all libraries to the 2021 edition") + # + # Link: https://lore.kernel.org/all/CANiq72kd9bHdKaAm=8xCUhSHMy2csyVed69bOc4dXyFAW4sfuw@mail.gmail.com/ + # + # At the time of writing all rust versions we support build the + # sysroot crates with the same edition. We may need to relax this + # assumption if future edition moves span multiple rust versions. + edition=core_edition, + ) + + # NB: sysroot crates reexport items from one another so setting up our transitive dependencies + # here is important for ensuring that rust-analyzer can resolve symbols. The sources of truth + # for this dependency graph are `(sysroot_src / crate / "Cargo.toml" for crate in crates)`. + core = append_sysroot_crate("core", []) + alloc = append_sysroot_crate("alloc", [core]) + std = append_sysroot_crate("std", [alloc, core]) + proc_macro = append_sysroot_crate("proc_macro", [core, std]) + + compiler_builtins = append_crate( + "compiler_builtins", + srctree / "rust" / "compiler_builtins.rs", + [core], + ) + + proc_macro2 = append_crate( + "proc_macro2", + srctree / "rust" / "proc-macro2" / "lib.rs", + [core, alloc, std, proc_macro], + ) + + quote = append_crate( + "quote", + srctree / "rust" / "quote" / "lib.rs", + [core, alloc, std, proc_macro, proc_macro2], + edition="2018", + ) + + syn = append_crate( + "syn", + srctree / "rust" / "syn" / "lib.rs", + [std, proc_macro, proc_macro2, quote], + ) + + macros = append_proc_macro_crate( + "macros", + srctree / "rust" / "macros" / "lib.rs", + [std, proc_macro, proc_macro2, quote, syn], + ) + + zerocopy_derive = append_proc_macro_crate( + "zerocopy_derive", + srctree / "rust" / "zerocopy-derive" / "lib.rs", + [std, proc_macro, proc_macro2, quote, syn], + ) + + build_error = append_crate( + "build_error", + srctree / "rust" / "build_error.rs", + [core, compiler_builtins], + ) + + pin_init_internal = append_proc_macro_crate( + "pin_init_internal", + srctree / "rust" / "pin-init" / "internal" / "src" / "lib.rs", + [std, proc_macro, proc_macro2, quote, syn], + ) + + pin_init = append_crate( + "pin_init", + srctree / "rust" / "pin-init" / "src" / "lib.rs", + [core, compiler_builtins, pin_init_internal, macros], + ) + + ffi = append_crate( + "ffi", + srctree / "rust" / "ffi.rs", + [core, compiler_builtins], + ) + + zerocopy = append_crate( + "zerocopy", + srctree / "rust" / "zerocopy" / "src" / "lib.rs", + [core, compiler_builtins], + ) + + def append_crate_with_generated( + display_name: str, + deps: List[Dependency], + ) -> Dependency: + crate = build_crate( + display_name, + srctree / "rust"/ display_name / "lib.rs", + deps, + cfg=generated_cfg, + is_workspace_member=True, + edition=None, + ) + crate["env"]["OBJTREE"] = str(objtree.resolve(True)) + crate_with_generated: CrateWithGenerated = { + **crate, + "source": { + "include_dirs": [ + str(srctree / "rust" / display_name), + str(objtree / "rust"), + ], + "exclude_dirs": [], + }, + } + return register_crate(crate_with_generated) + + bindings = append_crate_with_generated("bindings", [core, ffi, pin_init]) + uapi = append_crate_with_generated("uapi", [core, ffi, pin_init]) + kernel = append_crate_with_generated( + "kernel", [core, macros, build_error, pin_init, ffi, bindings, uapi, zerocopy, zerocopy_derive] + ) + + scripts = srctree / "scripts" + makefile = (scripts / "Makefile").read_text() + for path in scripts.glob("*.rs"): + name = path.stem + if f"{name}-rust" not in makefile: + continue + append_crate( + name, + path, + [std], + ) + + def is_root_crate(build_file: pathlib.Path, target: str) -> bool: + try: + contents = build_file.read_text() + except FileNotFoundError: + return False + return f"{target}.o" in contents + + # Then, the rest outside of `rust/`. + # + # We explicitly mention the top-level folders we want to cover. + extra_dirs: Iterable[pathlib.Path] = ( + srctree / dir for dir in ("samples", "drivers") + ) + if external_src is not None: + extra_dirs = [external_src] + for folder in extra_dirs: + for path in folder.rglob("*.rs"): + logging.info("Checking %s", path) + file_name = path.stem + + # Skip those that are not crate roots. + if not is_root_crate(path.parent / "Makefile", file_name) and \ + not is_root_crate(path.parent / "Kbuild", file_name): + continue + + crate_name = get_crate_name(path) + logging.info("Adding %s", crate_name) + append_crate( + crate_name, + path, + [core, kernel, pin_init, zerocopy, zerocopy_derive], + cfg=generated_cfg, + ) + + return crates + +def main() -> None: + parser = argparse.ArgumentParser() + parser.add_argument('--verbose', '-v', action='store_true') + parser.add_argument('--cfgs', action='append', default=[]) + parser.add_argument('--envs', action='append', default=[]) + parser.add_argument("core_edition") + parser.add_argument("srctree", type=pathlib.Path) + parser.add_argument("objtree", type=pathlib.Path) + parser.add_argument("sysroot", type=pathlib.Path) + parser.add_argument("sysroot_src", type=pathlib.Path) + parser.add_argument("exttree", type=pathlib.Path, nargs="?") + + class Args(argparse.Namespace): + verbose: bool + cfgs: List[str] + envs: List[str] + srctree: pathlib.Path + objtree: pathlib.Path + sysroot: pathlib.Path + sysroot_src: pathlib.Path + exttree: Optional[pathlib.Path] + core_edition: str + + args = parser.parse_args(namespace=Args()) + + logging.basicConfig( + format="[%(asctime)s] [%(levelname)s] %(message)s", + level=logging.INFO if args.verbose else logging.WARNING + ) + + rust_project = { + "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs, args.envs, args.core_edition), + "sysroot": str(args.sysroot), + } + + json.dump(rust_project, sys.stdout, sort_keys=True, indent=4) + +if __name__ == "__main__": + main() -- cgit v1.3.1