git: 24cd5c26fe3e - main - bhyveload: support guest rebooting from the loader
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Date: Fri, 05 Jan 2024 06:22:05 UTC
The branch main has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=24cd5c26fe3ef7181e85467d9d55afbd76af5a2c commit 24cd5c26fe3ef7181e85467d9d55afbd76af5a2c Author: Kyle Evans <kevans@FreeBSD.org> AuthorDate: 2024-01-05 06:21:15 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2024-01-05 06:21:15 +0000 bhyveload: support guest rebooting from the loader userboot has a EXIT_REBOOT code that it uses when the 'reboot' loader command is executed. Use that and longjmp back to reinit the VM entirely with a reboot request. This fixes the 'reboot' option in the loader menu to actually reboot rather than shutdown the VM. The JMP_* constants are introduced to keep track of why we're doing a longjmp, though they aren't currently used. We'll notably still do a complete reload of the interpreter to give the rebooted VM that new loader smell. It just seemed forward thinking to just keep track of the different setjmp points. While we're here, we don't actually need to keep the fd we passed to fdlopen(3), so let's avoid leaking it. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D43300 --- usr.sbin/bhyveload/bhyveload.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/usr.sbin/bhyveload/bhyveload.c b/usr.sbin/bhyveload/bhyveload.c index f75ef27dd958..37338e77d621 100644 --- a/usr.sbin/bhyveload/bhyveload.c +++ b/usr.sbin/bhyveload/bhyveload.c @@ -89,6 +89,16 @@ #define NDISKS 32 +/* + * Reason for our loader reload and reentry, though these aren't really used + * at the moment. + */ +enum { + /* 0 cannot be allocated; setjmp(3) return. */ + JMP_SWAPLOADER = 0x01, + JMP_REBOOT, +}; + static struct termios term, oldterm; static int disk_fd[NDISKS]; static int ndisks; @@ -543,6 +553,8 @@ cb_exit(void *arg __unused, int v) { tcsetattr(consout_fd, TCSAFLUSH, &oldterm); + if (v == USERBOOT_EXIT_REBOOT) + longjmp(jb, JMP_REBOOT); exit(v); } @@ -628,7 +640,7 @@ cb_swap_interpreter(void *arg __unused, const char *interp_req) if (asprintf(&loader, "userboot_%s.so", interp_req) == -1) err(EX_OSERR, "malloc"); - longjmp(jb, 1); + longjmp(jb, JMP_SWAPLOADER); } static struct loader_callbacks cb = { @@ -769,6 +781,8 @@ loader_open(int bootfd) loader_hdl = fdlopen(fd, RTLD_LOCAL); if (!loader_hdl) errx(EX_OSERR, "dlopen: %s", dlerror()); + if (fd != explicit_loader_fd) + close(fd); } int