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cpus: remove ugly cast on sigbus_handler 

The cast is there because sigbus_handler is invoked via sigfd_handler.
But it feels just wrong to use struct qemu_signalfd_siginfo in the
prototype of a function that is passed to sigaction.

Instead, do a simple-minded conversion of qemu_signalfd_siginfo to
siginfo_t.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-02-08 13:22:12 +01:00
parent 30f3dda24b
commit d98d407234
6 changed files with 65 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
cpus.c
View File

@ -51,10 +51,6 @@
#include "hw/nmi.h"
#include "sysemu/replay.h"
#ifndef _WIN32
#include "qemu/compatfd.h"
#endif
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
@ -924,11 +920,9 @@ static void sigbus_reraise(void)
abort();
}
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
void *ctx)
static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
{
if (kvm_on_sigbus(siginfo->ssi_code,
(void *)(intptr_t)siginfo->ssi_addr)) {
if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
sigbus_reraise();
}
}
@ -939,7 +933,7 @@ static void qemu_init_sigbus(void)
memset(&action, 0, sizeof(action));
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
action.sa_sigaction = sigbus_handler;
sigaction(SIGBUS, &action, NULL);
prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);

42
include/qemu/compatfd.h
View File

@ -1,42 +0,0 @@
/*
* signalfd/eventfd compatibility
*
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_COMPATFD_H
#define QEMU_COMPATFD_H
struct qemu_signalfd_siginfo {
uint32_t ssi_signo; /* Signal number */
int32_t ssi_errno; /* Error number (unused) */
int32_t ssi_code; /* Signal code */
uint32_t ssi_pid; /* PID of sender */
uint32_t ssi_uid; /* Real UID of sender */
int32_t ssi_fd; /* File descriptor (SIGIO) */
uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */
uint32_t ssi_band; /* Band event (SIGIO) */
uint32_t ssi_overrun; /* POSIX timer overrun count */
uint32_t ssi_trapno; /* Trap number that caused signal */
int32_t ssi_status; /* Exit status or signal (SIGCHLD) */
int32_t ssi_int; /* Integer sent by sigqueue(2) */
uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */
uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */
uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */
uint64_t ssi_addr; /* Address that generated signal
(for hardware-generated signals) */
uint8_t pad[48]; /* Pad size to 128 bytes (allow for
additional fields in the future) */
};
int qemu_signalfd(const sigset_t *mask);
#endif

28
include/qemu/osdep.h
View File

@ -297,6 +297,34 @@ void qemu_anon_ram_free(void *ptr, size_t size);
# define QEMU_VMALLOC_ALIGN getpagesize()
#endif
#ifdef CONFIG_POSIX
struct qemu_signalfd_siginfo {
uint32_t ssi_signo; /* Signal number */
int32_t ssi_errno; /* Error number (unused) */
int32_t ssi_code; /* Signal code */
uint32_t ssi_pid; /* PID of sender */
uint32_t ssi_uid; /* Real UID of sender */
int32_t ssi_fd; /* File descriptor (SIGIO) */
uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */
uint32_t ssi_band; /* Band event (SIGIO) */
uint32_t ssi_overrun; /* POSIX timer overrun count */
uint32_t ssi_trapno; /* Trap number that caused signal */
int32_t ssi_status; /* Exit status or signal (SIGCHLD) */
int32_t ssi_int; /* Integer sent by sigqueue(2) */
uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */
uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */
uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */
uint64_t ssi_addr; /* Address that generated signal
(for hardware-generated signals) */
uint8_t pad[48]; /* Pad size to 128 bytes (allow for
additional fields in the future) */
};
int qemu_signalfd(const sigset_t *mask);
void sigaction_invoke(struct sigaction *action,
struct qemu_signalfd_siginfo *info);
#endif
int qemu_madvise(void *addr, size_t len, int advice);
int qemu_open(const char *name, int flags, ...);

1
util/compatfd.c
View File

@ -15,7 +15,6 @@
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/compatfd.h"
#include "qemu/thread.h"
#include <sys/syscall.h>

5
util/main-loop.c
View File

@ -34,8 +34,6 @@
#ifndef _WIN32
#include "qemu/compatfd.h"
/* If we have signalfd, we mask out the signals we want to handle and then
* use signalfd to listen for them. We rely on whatever the current signal
* handler is to dispatch the signals when we receive them.
@ -63,8 +61,7 @@ static void sigfd_handler(void *opaque)
sigaction(info.ssi_signo, NULL, &action);
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
action.sa_sigaction(info.ssi_signo,
(siginfo_t *)&info, NULL);
sigaction_invoke(&action, &info);
} else if (action.sa_handler) {
action.sa_handler(info.ssi_signo);
}

33
util/oslib-posix.c
View File

@ -603,3 +603,36 @@ void qemu_free_stack(void *stack, size_t sz)
munmap(stack, sz);
}
void sigaction_invoke(struct sigaction *action,
struct qemu_signalfd_siginfo *info)
{
siginfo_t si = { 0 };
si.si_signo = info->ssi_signo;
si.si_errno = info->ssi_errno;
si.si_code = info->ssi_code;
/* Convert the minimal set of fields defined by POSIX.
* Positive si_code values are reserved for kernel-generated
* signals, where the valid siginfo fields are determined by
* the signal number. But according to POSIX, it is unspecified
* whether SI_USER and SI_QUEUE have values less than or equal to
* zero.
*/
if (info->ssi_code == SI_USER || info->ssi_code == SI_QUEUE ||
info->ssi_code <= 0) {
/* SIGTERM, etc. */
si.si_pid = info->ssi_pid;
si.si_uid = info->ssi_uid;
} else if (info->ssi_signo == SIGILL || info->ssi_signo == SIGFPE ||
info->ssi_signo == SIGSEGV || info->ssi_signo == SIGBUS) {
si.si_addr = (void *)(uintptr_t)info->ssi_addr;
} else if (info->ssi_signo == SIGCHLD) {
si.si_pid = info->ssi_pid;
si.si_status = info->ssi_status;
si.si_uid = info->ssi_uid;
} else if (info->ssi_signo == SIGIO) {
si.si_band = info->ssi_band;
}
action->sa_sigaction(info->ssi_signo, &si, NULL);
}