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shutdown: Add Xen kexec support
In the Xen case, it's the hypervisor which manages kexec. We thus have to ask it whether a kernel is loaded, instead of relying on /sys/kernel/kexec_loaded.
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1
.github/workflows/build_test.sh
vendored
1
.github/workflows/build_test.sh
vendored
@ -42,6 +42,7 @@ PACKAGES=(
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libqrencode-dev
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libssl-dev
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libtss2-dev
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libxen-dev
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libxkbcommon-dev
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libxtables-dev
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libzstd-dev
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13
meson.build
13
meson.build
@ -1273,6 +1273,18 @@ else
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endif
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conf.set10('HAVE_KMOD', have)
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want_xenctrl = get_option('xenctrl')
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if want_xenctrl != 'false' and not skip_deps
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libxenctrl = dependency('xencontrol',
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version : '>= 4.9',
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required : want_xenctrl == 'true')
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have = libxenctrl.found()
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else
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have = false
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libxenctrl = []
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endif
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conf.set10('HAVE_XENCTRL', have)
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want_pam = get_option('pam')
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if want_pam != 'false' and not skip_deps
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libpam = cc.find_library('pam', required : want_pam == 'true')
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@ -4398,6 +4410,7 @@ foreach tuple : [
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['nscd'],
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['legacy-pkla', install_polkit_pkla],
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['kmod'],
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['xenctrl'],
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['dbus'],
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['glib'],
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['tpm'],
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@ -371,6 +371,8 @@ option('fdisk', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'libfdisk support')
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option('kmod', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'support for loadable modules')
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option('xenctrl', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'support for Xen kexec')
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option('pam', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'PAM support')
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option('pwquality', type : 'combo', choices : ['auto', 'true', 'false'],
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@ -61,6 +61,7 @@ BuildPackages=
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libseccomp-dev
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libsmartcols-dev
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libssl-dev
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libxen-dev
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libxkbcommon-dev
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libzstd-dev
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pahole
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@ -67,6 +67,7 @@ BuildPackages=
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pkgconfig(tss2-mu)
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pkgconfig(tss2-rc)
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pkgconfig(valgrind)
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pkgconfig(xencontrol)
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pkgconfig(xkbcommon)
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python3dist(jinja2)
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python3dist(lxml)
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@ -80,4 +80,5 @@ BuildPackages=
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systemd-sysvinit
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timezone
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tpm2-0-tss-devel
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xen-devel
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zlib-devel
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@ -62,6 +62,7 @@ BuildPackages=
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libseccomp-dev
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libsmartcols-dev
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libssl-dev
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libxen-dev
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libxkbcommon-dev
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libzstd-dev
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pahole
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@ -23,15 +23,6 @@ int saved_argc = 0;
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char **saved_argv = NULL;
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static int saved_in_initrd = -1;
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bool kexec_loaded(void) {
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_cleanup_free_ char *s = NULL;
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if (read_one_line_file("/sys/kernel/kexec_loaded", &s) < 0)
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return false;
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return s[0] == '1';
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}
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int prot_from_flags(int flags) {
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switch (flags & O_ACCMODE) {
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@ -19,8 +19,6 @@ static inline void save_argc_argv(int argc, char **argv) {
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saved_argv = argv;
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}
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bool kexec_loaded(void);
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int prot_from_flags(int flags) _const_;
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bool in_initrd(void);
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@ -24,6 +24,7 @@
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#include "main-func.h"
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#include "memory-util.h"
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#include "process-util.h"
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#include "reboot-util.h"
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#include "special.h"
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#define SERVER_FD_MAX 16
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@ -465,7 +465,8 @@ libshared_deps = [threads,
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libseccomp,
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libselinux,
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libzstd,
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libxz]
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libxz,
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libxenctrl]
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libshared_sym_path = '@0@/libshared.sym'.format(meson.current_source_dir())
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@ -1,11 +1,28 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#if HAVE_XENCTRL
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#define __XEN_INTERFACE_VERSION__ 0x00040900
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#include <xen/xen.h>
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#include <xen/kexec.h>
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#include <xen/sys/privcmd.h>
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#endif
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#include "alloc-util.h"
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#include "errno-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "memory-util.h"
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#include "proc-cmdline.h"
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#include "raw-reboot.h"
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#include "reboot-util.h"
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@ -107,3 +124,74 @@ int shall_restore_state(void) {
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return r > 0 ? ret : true;
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}
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static int xen_kexec_loaded(void) {
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#if HAVE_XENCTRL
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size_t size;
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_cleanup_close_ int privcmd_fd = -1, buf_fd = -1;
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void *buffer;
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int r;
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if (access("/proc/xen", F_OK) < 0) {
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if (errno == ENOENT)
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return -EOPNOTSUPP;
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return log_debug_errno(errno, "Unable to test whether /proc/xen exists: %m");
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}
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size = page_size();
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if (sizeof(xen_kexec_status_t) > size)
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "page_size is too small for hypercall");
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privcmd_fd = open("/dev/xen/privcmd", O_RDWR|O_CLOEXEC);
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if (privcmd_fd < 0)
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return log_debug_errno(errno, "Cannot access /dev/xen/privcmd: %m");
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buf_fd = open("/dev/xen/hypercall", O_RDWR|O_CLOEXEC);
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if (buf_fd < 0)
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return log_debug_errno(errno, "Cannot access /dev/xen/hypercall: %m");
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buffer = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, buf_fd, 0);
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if (buffer == MAP_FAILED)
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return log_debug_errno(errno, "Cannot allocate buffer for hypercall: %m");
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*(xen_kexec_status_t*) buffer = (xen_kexec_status_t) {
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.type = KEXEC_TYPE_DEFAULT,
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};
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privcmd_hypercall_t call = {
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.op = __HYPERVISOR_kexec_op,
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.arg = {
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KEXEC_CMD_kexec_status,
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PTR_TO_UINT64(buffer),
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},
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};
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r = RET_NERRNO(ioctl(privcmd_fd, IOCTL_PRIVCMD_HYPERCALL, &call));
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if (r < 0)
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log_debug_errno(r, "kexec_status failed: %m");
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munmap(buffer, size);
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return r;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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bool kexec_loaded(void) {
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_cleanup_free_ char *s = NULL;
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int r;
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r = xen_kexec_loaded();
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if (r >= 0)
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return r;
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r = read_one_line_file("/sys/kernel/kexec_loaded", &s);
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if (r < 0) {
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if (r != -ENOENT)
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log_debug_errno(r, "Unable to read /sys/kernel/kexec_loaded, ignoring: %m");
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return false;
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}
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return s[0] == '1';
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}
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@ -13,3 +13,5 @@ int read_reboot_parameter(char **parameter);
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int reboot_with_parameter(RebootFlags flags);
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int shall_restore_state(void);
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bool kexec_loaded(void);
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@ -4,6 +4,7 @@
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#include "alloc-util.h"
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#include "pretty-print.h"
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#include "reboot-util.h"
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#include "systemctl-compat-shutdown.h"
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#include "systemctl-sysv-compat.h"
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#include "systemctl.h"
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@ -17,6 +17,7 @@
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#include "path-util.h"
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#include "pretty-print.h"
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#include "process-util.h"
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#include "reboot-util.h"
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#include "rlimit-util.h"
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#include "sigbus.h"
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#include "signal-util.h"
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