Merge remote-tracking branch 'remotes/bonzini-gitlab/tags/for-upstream' into staging

* SCSI fix (Dmitry, Li Feng, Li Qiang)
* memory API fixes (Eduardo)
* removal of deprecated '-numa node', 'cpu-add', '-smp' (Igor)
* ACPI fix for VMBus (Jon)
* relocatable install (myself)
* always remove docker containers (myself)
* serial cleanups (Philippe)
* vmware cpuid leaf for tsc and apic frequency (Sunil)
* KVM_FEATURE_ASYNC_PF_INT support (Vitaly)
* i386 XSAVE bugfix (Xiaoyao)
* QOM developer documentation in docs/devel (Eduardo)
* new checkpatch tests (Dov)
* x86_64 syscall fix (Douglas)
* interrupt-based APF fix (Vitaly)
* always create kvmclock (Vitaly)
* fix bios-tables-test (Eduardo)
* KVM PV features cleanup (myself)
* CAN FD (Pavel)

meson:
* fixes (Marc-André, Max, Stefan, Alexander, myself)
* moved libmpathpersist, cocoa, malloc tests (myself)
* support for 0.56 introspected test dependencies (myself)

# gpg: Signature made Wed 30 Sep 2020 18:11:45 BST
# 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

* remotes/bonzini-gitlab/tags/for-upstream: (86 commits)
  hw/net/can: Correct Kconfig dependencies
  hw/net/can: Documentation for CTU CAN FD IP open hardware core emulation.
  hw/net/can: CTU CAN FD IP open hardware core emulation.
  hw/net/can/ctucafd: Add CTU CAN FD core register definitions.
  net/can: Add can_dlc2len and can_len2dlc for CAN FD.
  hw/net/can: sja1000 ignore CAN FD frames
  net/can: Initial host SocketCan support for CAN FD.
  target/i386: kvm: do not use kvm_check_extension to find paravirtual capabilities
  bios-tables-test: Remove kernel-irqchip=off option
  target/i386: always create kvmclock device
  target/i386: Fix VM migration when interrupt based APF is enabled
  helper_syscall x86_64: clear exception_is_int
  checkpatch: Detect '%#' or '%0#' in printf-style format strings
  typedefs: Restrict PCMachineState to 'hw/i386/pc.h'
  hw/xen: Split x86-specific declaration from generic hardware ones
  stubs: Split accelerator / hardware related stubs
  sysemu/xen: Add missing 'exec/cpu-common.h' header for ram_addr_t type
  hw/i386/xen: Rename X86/PC specific function as xen_hvm_init_pc()
  docs: Move object.h overview doc comment to qom.rst
  docs: Create docs/devel/qom.rst
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 90 insertions, 30 deletions

diff --git a/util/cutils.c b/util/cutils.c
index 36ce712271..8da34e04b0 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -889,3 +889,64 @@ int qemu_pstrcmp0(const char **str1, const char **str2)
 {
     return g_strcmp0(*str1, *str2);
 }
+
+static inline bool starts_with_prefix(const char *dir)
+{
+    size_t prefix_len = strlen(CONFIG_PREFIX);
+    return !memcmp(dir, CONFIG_PREFIX, prefix_len) &&
+        (!dir[prefix_len] || G_IS_DIR_SEPARATOR(dir[prefix_len]));
+}
+
+/* Return the next path component in dir, and store its length in *p_len.  */
+static inline const char *next_component(const char *dir, int *p_len)
+{
+    int len;
+    while (*dir && G_IS_DIR_SEPARATOR(*dir)) {
+        dir++;
+    }
+    len = 0;
+    while (dir[len] && !G_IS_DIR_SEPARATOR(dir[len])) {
+        len++;
+    }
+    *p_len = len;
+    return dir;
+}
+
+char *get_relocated_path(const char *dir)
+{
+    size_t prefix_len = strlen(CONFIG_PREFIX);
+    const char *bindir = CONFIG_BINDIR;
+    const char *exec_dir = qemu_get_exec_dir();
+    GString *result;
+    int len_dir, len_bindir;
+
+    /* Fail if qemu_init_exec_dir was not called.  */
+    assert(exec_dir[0]);
+    if (!starts_with_prefix(dir) || !starts_with_prefix(bindir)) {
+        return strdup(dir);
+    }
+
+    result = g_string_new(exec_dir);
+
+    /* Advance over common components.  */
+    len_dir = len_bindir = prefix_len;
+    do {
+        dir += len_dir;
+        bindir += len_bindir;
+        dir = next_component(dir, &len_dir);
+        bindir = next_component(bindir, &len_bindir);
+    } while (len_dir == len_bindir && !memcmp(dir, bindir, len_dir));
+
+    /* Ascend from bindir to the common prefix with dir.  */
+    while (len_bindir) {
+        bindir += len_bindir;
+        g_string_append(result, "/..");
+        bindir = next_component(bindir, &len_bindir);
+    }
+
+    if (*dir) {
+        assert(G_IS_DIR_SEPARATOR(dir[-1]));
+        g_string_append(result, dir - 1);
+    }
+    return result->str;
+}
diff --git a/util/module.c b/util/module.c
index 34772e7d87..a44ec38d93 100644
--- a/util/module.c
+++ b/util/module.c
@@ -19,6 +19,7 @@
 #endif
 #include "qemu/queue.h"
 #include "qemu/module.h"
+#include "qemu/cutils.h"
 #ifdef CONFIG_MODULE_UPGRADES
 #include "qemu-version.h"
 #endif
@@ -172,7 +173,6 @@ bool module_load_one(const char *prefix, const char *lib_name)
 
 #ifdef CONFIG_MODULES
     char *fname = NULL;
-    char *exec_dir;
 #ifdef CONFIG_MODULE_UPGRADES
     char *version_dir;
 #endif
@@ -199,13 +199,12 @@ bool module_load_one(const char *prefix, const char *lib_name)
         return true;
     }
 
-    exec_dir = qemu_get_exec_dir();
     search_dir = getenv("QEMU_MODULE_DIR");
     if (search_dir != NULL) {
         dirs[n_dirs++] = g_strdup_printf("%s", search_dir);
     }
-    dirs[n_dirs++] = g_strdup_printf("%s", CONFIG_QEMU_MODDIR);
-    dirs[n_dirs++] = g_strdup_printf("%s", exec_dir ? : "");
+    dirs[n_dirs++] = get_relocated_path(CONFIG_QEMU_MODDIR);
+    dirs[n_dirs++] = g_strdup(qemu_get_exec_dir());
 
 #ifdef CONFIG_MODULE_UPGRADES
     version_dir = g_strcanon(g_strdup(QEMU_PKGVERSION),
@@ -216,9 +215,6 @@ bool module_load_one(const char *prefix, const char *lib_name)
 
     assert(n_dirs <= ARRAY_SIZE(dirs));
 
-    g_free(exec_dir);
-    exec_dir = NULL;
-
     for (i = 0; i < n_dirs; i++) {
         fname = g_strdup_printf("%s/%s%s",
                 dirs[i], module_name, CONFIG_HOST_DSOSUF);
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index f5f676f079..f15234b5c0 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -339,8 +339,10 @@ int qemu_pipe(int pipefd[2])
 char *
 qemu_get_local_state_pathname(const char *relative_pathname)
 {
-    return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR,
-                           relative_pathname);
+    g_autofree char *dir = g_strdup_printf("%s/%s",
+                                           CONFIG_QEMU_LOCALSTATEDIR,
+                                           relative_pathname);
+    return get_relocated_path(dir);
 }
 
 void qemu_set_tty_echo(int fd, bool echo)
@@ -358,15 +360,16 @@ void qemu_set_tty_echo(int fd, bool echo)
     tcsetattr(fd, TCSANOW, &tty);
 }
 
-static char exec_dir[PATH_MAX];
+static const char *exec_dir;
 
 void qemu_init_exec_dir(const char *argv0)
 {
-    char *dir;
     char *p = NULL;
     char buf[PATH_MAX];
 
-    assert(!exec_dir[0]);
+    if (exec_dir) {
+        return;
+    }
 
 #if defined(__linux__)
     {
@@ -423,25 +426,19 @@ void qemu_init_exec_dir(const char *argv0)
 #endif
     /* If we don't have any way of figuring out the actual executable
        location then try argv[0].  */
-    if (!p) {
-        if (!argv0) {
-            return;
-        }
+    if (!p && argv0) {
         p = realpath(argv0, buf);
-        if (!p) {
-            return;
-        }
     }
-    dir = g_path_get_dirname(p);
-
-    pstrcpy(exec_dir, sizeof(exec_dir), dir);
-
-    g_free(dir);
+    if (p) {
+        exec_dir = g_path_get_dirname(p);
+    } else {
+        exec_dir = CONFIG_BINDIR;
+    }
 }
 
-char *qemu_get_exec_dir(void)
+const char *qemu_get_exec_dir(void)
 {
-    return g_strdup(exec_dir);
+    return exec_dir;
 }
 
 static void sigbus_handler(int signal)
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index c654dafd93..051afb217b 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -315,7 +315,7 @@ void qemu_set_tty_echo(int fd, bool echo)
     }
 }
 
-static char exec_dir[PATH_MAX];
+static const char *exec_dir;
 
 void qemu_init_exec_dir(const char *argv0)
 {
@@ -324,6 +324,10 @@ void qemu_init_exec_dir(const char *argv0)
     char buf[MAX_PATH];
     DWORD len;
 
+    if (exec_dir) {
+        return;
+    }
+
     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
     if (len == 0) {
         return;
@@ -336,13 +340,15 @@ void qemu_init_exec_dir(const char *argv0)
     }
     *p = 0;
     if (access(buf, R_OK) == 0) {
-        pstrcpy(exec_dir, sizeof(exec_dir), buf);
+        exec_dir = g_strdup(buf);
+    } else {
+        exec_dir = CONFIG_BINDIR;
     }
 }
 
-char *qemu_get_exec_dir(void)
+const char *qemu_get_exec_dir(void)
 {
-    return g_strdup(exec_dir);
+    return exec_dir;
 }
 
 #if !GLIB_CHECK_VERSION(2, 50, 0)