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* bug fixes 

* reduced memory footprint for IPI virtualization on Intel processors
 * asynchronous teardown support (Linux only)
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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* bug fixes
* reduced memory footprint for IPI virtualization on Intel processors
* asynchronous teardown support (Linux only)

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# gpg: Signature made Wed 02 Nov 2022 07:40:25 EDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  target/i386: Fix test for paging enabled
  util/log: Close per-thread log file on thread termination
  target/i386: Set maximum APIC ID to KVM prior to vCPU creation
  os-posix: asynchronous teardown for shutdown on Linux
  target/i386: Fix calculation of LOCK NEG eflags

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2022-11-03 10:54:37 -04:00
parent 5e82102268 03a60ae9ca
commit 7f5acfcb66
13 changed files with 230 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
hw/i386/x86.c
View File

@ -140,6 +140,10 @@ void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version)
exit(EXIT_FAILURE);
}
if (kvm_enabled()) {
kvm_set_max_apic_id(x86ms->apic_id_limit);
}
possible_cpus = mc->possible_cpu_arch_ids(ms);
for (i = 0; i < ms->smp.cpus; i++) {
x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id, &error_fatal);

22
include/qemu/async-teardown.h Normal file
View File

@ -0,0 +1,22 @@
/*
* Asynchronous teardown
*
* Copyright IBM, Corp. 2022
*
* Authors:
* Claudio Imbrenda <imbrenda@linux.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at your
* option) any later version. See the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_ASYNC_TEARDOWN_H
#define QEMU_ASYNC_TEARDOWN_H
#include "config-host.h"
#ifdef CONFIG_LINUX
void init_async_teardown(void);
#endif
#endif

1
meson.build
View File

@ -1955,6 +1955,7 @@ if targetos == 'windows'
endif
# has_function
config_host_data.set('CONFIG_CLOSE_RANGE', cc.has_function('close_range'))
config_host_data.set('CONFIG_ACCEPT4', cc.has_function('accept4'))
config_host_data.set('CONFIG_CLOCK_ADJTIME', cc.has_function('clock_adjtime'))
config_host_data.set('CONFIG_DUP3', cc.has_function('dup3'))

6
os-posix.c
View File

@ -39,6 +39,7 @@
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
#include "qemu/async-teardown.h"
#endif
/*
@ -150,6 +151,11 @@ int os_parse_cmd_args(int index, const char *optarg)
case QEMU_OPTION_daemonize:
daemonize = 1;
break;
#if defined(CONFIG_LINUX)
case QEMU_OPTION_asyncteardown:
init_async_teardown();
break;
#endif
default:
return -1;
}

19
qemu-options.hx
View File

@ -4790,6 +4790,25 @@ HXCOMM Internal use
DEF("qtest", HAS_ARG, QEMU_OPTION_qtest, "", QEMU_ARCH_ALL)
DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log, "", QEMU_ARCH_ALL)
#ifdef __linux__
DEF("async-teardown", 0, QEMU_OPTION_asyncteardown,
"-async-teardown enable asynchronous teardown\n",
QEMU_ARCH_ALL)
#endif
SRST
``-async-teardown``
Enable asynchronous teardown. A new process called "cleanup/<QEMU_PID>"
will be created at startup sharing the address space with the main qemu
process, using clone. It will wait for the main qemu process to
terminate completely, and then exit.
This allows qemu to terminate very quickly even if the guest was
huge, leaving the teardown of the address space to the cleanup
process. Since the cleanup process shares the same cgroups as the
main qemu process, accounting is performed correctly. This only
works if the cleanup process is not forcefully killed with SIGKILL
before the main qemu process has terminated completely.
ERST
DEF("msg", HAS_ARG, QEMU_OPTION_msg,
"-msg [timestamp[=on|off]][,guest-name=[on|off]]\n"
" control error message format\n"

5
target/i386/kvm/kvm-stub.c
View File

@ -44,3 +44,8 @@ bool kvm_hyperv_expand_features(X86CPU *cpu, Error **errp)
{
abort();
}
void kvm_set_max_apic_id(uint32_t max_apic_id)
{
return;
}

5
target/i386/kvm/kvm.c
View File

@ -5723,3 +5723,8 @@ void kvm_arch_accel_class_init(ObjectClass *oc)
"Clock cycles without an event window "
"after which a notification VM exit occurs");
}
void kvm_set_max_apic_id(uint32_t max_apic_id)
{
kvm_vm_enable_cap(kvm_state, KVM_CAP_MAX_VCPU_ID, 0, max_apic_id);
}

2
target/i386/kvm/kvm_i386.h
View File

@ -66,4 +66,6 @@ typedef struct kvm_msr_handlers {
bool kvm_filter_msr(KVMState *s, uint32_t msr, QEMURDMSRHandler *rdmsr,
QEMUWRMSRHandler *wrmsr);
void kvm_set_max_apic_id(uint32_t max_apic_id);
#endif

10
target/i386/tcg/sysemu/excp_helper.c
View File

@ -553,12 +553,12 @@ static bool get_physical_address(CPUX86State *env, vaddr addr,
break;
default:
in.cr3 = env->cr[3];
in.mmu_idx = mmu_idx;
in.ptw_idx = use_stage2 ? MMU_NESTED_IDX : MMU_PHYS_IDX;
in.pg_mode = get_pg_mode(env);
if (likely(env->cr[0] & CR0_PG_MASK)) {
in.cr3 = env->cr[3];
in.mmu_idx = mmu_idx;
in.ptw_idx = use_stage2 ? MMU_NESTED_IDX : MMU_PHYS_IDX;
in.pg_mode = get_pg_mode(env);
if (likely(in.pg_mode)) {
if (in.pg_mode & PG_MODE_LMA) {
/* test virtual address sign extension */
int shift = in.pg_mode & PG_MODE_LA57 ? 56 : 47;

2
target/i386/tcg/translate.c
View File

@ -3320,7 +3320,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
tcg_temp_free(t2);
tcg_temp_free(a0);
tcg_gen_mov_tl(s->T0, t0);
tcg_gen_neg_tl(s->T0, t0);
tcg_temp_free(t0);
} else {
tcg_gen_neg_tl(s->T0, s->T0);

150
util/async-teardown.c Normal file
View File

@ -0,0 +1,150 @@
/*
* Asynchronous teardown
*
* Copyright IBM, Corp. 2022
*
* Authors:
* Claudio Imbrenda <imbrenda@linux.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at your
* option) any later version. See the COPYING file in the top-level directory.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/prctl.h>
#include <signal.h>
#include <sched.h>
#include <unistd.h>
#include "qemu/osdep.h"
#include "qemu/async-teardown.h"
#ifdef _SC_THREAD_STACK_MIN
#define CLONE_STACK_SIZE sysconf(_SC_THREAD_STACK_MIN)
#else
#define CLONE_STACK_SIZE 16384
#endif
static pid_t the_ppid;
/*
* Close all open file descriptors.
*/
static void close_all_open_fd(void)
{
struct dirent *de;
int fd, dfd;
DIR *dir;
#ifdef CONFIG_CLOSE_RANGE
int r = close_range(0, ~0U, 0);
if (!r) {
/* Success, no need to try other ways. */
return;
}
#endif
dir = opendir("/proc/self/fd");
if (!dir) {
/* If /proc is not mounted, there is nothing that can be done. */
return;
}
/* Avoid closing the directory. */
dfd = dirfd(dir);
for (de = readdir(dir); de; de = readdir(dir)) {
fd = atoi(de->d_name);
if (fd != dfd) {
close(fd);
}
}
closedir(dir);
}
static void hup_handler(int signal)
{
/* Check every second if this process has been reparented. */
while (the_ppid == getppid()) {
/* sleep() is safe to use in a signal handler. */
sleep(1);
}
/* At this point the parent process has terminated completely. */
_exit(0);
}
static int async_teardown_fn(void *arg)
{
struct sigaction sa = { .sa_handler = hup_handler };
sigset_t hup_signal;
char name[16];
/* Set a meaningful name for this process. */
snprintf(name, 16, "cleanup/%d", the_ppid);
prctl(PR_SET_NAME, (unsigned long)name);
/*
* Close all file descriptors that might have been inherited from the
* main qemu process when doing clone, needed to make libvirt happy.
* Not using close_range for increased compatibility with older kernels.
*/
close_all_open_fd();
/* Set up a handler for SIGHUP and unblock SIGHUP. */
sigaction(SIGHUP, &sa, NULL);
sigemptyset(&hup_signal);
sigaddset(&hup_signal, SIGHUP);
sigprocmask(SIG_UNBLOCK, &hup_signal, NULL);
/* Ask to receive SIGHUP when the parent dies. */
prctl(PR_SET_PDEATHSIG, SIGHUP);
/*
* Sleep forever, unless the parent process has already terminated. The
* only interruption can come from the SIGHUP signal, which in normal
* operation is received when the parent process dies.
*/
if (the_ppid == getppid()) {
pause();
}
/* At this point the parent process has terminated completely. */
_exit(0);
}
/*
* Allocate a new stack of a reasonable size, and return a pointer to its top.
*/
static void *new_stack_for_clone(void)
{
size_t stack_size = CLONE_STACK_SIZE;
char *stack_ptr;
/* Allocate a new stack and get a pointer to its top. */
stack_ptr = qemu_alloc_stack(&stack_size);
#if !defined(HOST_HPPA)
/* The top is at the end of the area, except on HPPA. */
stack_ptr += stack_size;
#endif
return stack_ptr;
}
/*
* Block all signals, start (clone) a new process sharing the address space
* with qemu (CLONE_VM), then restore signals.
*/
void init_async_teardown(void)
{
sigset_t all_signals, old_signals;
the_ppid = getpid();
sigfillset(&all_signals);
sigprocmask(SIG_BLOCK, &all_signals, &old_signals);
clone(async_teardown_fn, new_stack_for_clone(), CLONE_VM, NULL);
sigprocmask(SIG_SETMASK, &old_signals, NULL);
}

9
util/log.c
View File

@ -42,6 +42,7 @@ static QemuMutex global_mutex;
static char *global_filename;
static FILE *global_file;
static __thread FILE *thread_file;
static __thread Notifier qemu_log_thread_cleanup_notifier;
int qemu_loglevel;
static bool log_append;
@ -77,6 +78,12 @@ static int log_thread_id(void)
#endif
}
static void qemu_log_thread_cleanup(Notifier *n, void *unused)
{
fclose(thread_file);
thread_file = NULL;
}
/* Lock/unlock output. */
FILE *qemu_log_trylock(void)
@ -93,6 +100,8 @@ FILE *qemu_log_trylock(void)
return NULL;
}
thread_file = logfile;
qemu_log_thread_cleanup_notifier.notify = qemu_log_thread_cleanup;
qemu_thread_atexit_add(&qemu_log_thread_cleanup_notifier);
} else {
rcu_read_lock();
/*

1
util/meson.build
View File

@ -3,6 +3,7 @@ util_ss.add(files('thread-context.c'), numa)
if not config_host_data.get('CONFIG_ATOMIC64')
util_ss.add(files('atomic64.c'))
endif
util_ss.add(when: 'CONFIG_LINUX', if_true: files('async-teardown.c'))
util_ss.add(when: 'CONFIG_POSIX', if_true: files('aio-posix.c'))
util_ss.add(when: 'CONFIG_POSIX', if_true: files('fdmon-poll.c'))
if config_host_data.get('CONFIG_EPOLL_CREATE1')