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diff --git a/usr.sbin/bhyve/bhyve_config.5 b/usr.sbin/bhyve/bhyve_config.5
--- a/usr.sbin/bhyve/bhyve_config.5
+++ b/usr.sbin/bhyve/bhyve_config.5
@@ -23,7 +23,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd September 25, 2021
+.Dd March 2, 2022
.Dt BHYVE_CONFIG 5
.Os
.Sh NAME
@@ -448,6 +448,11 @@
memory ending just before the 4GB physical address.
If a boot ROM is present, a firmware interface device is
also enabled for use by the boot ROM.
+.It Va bootvars Ta path Ta Ta
+Path to boot VARS.
+The contents of this file are copied beneath the boot ROM.
+Firmware can write to it to save variables.
+All variables will be persistent even on reboots of the guest.
.It Va com1 Ta node Ta Ta
Settings for the COM1 serial port device.
.It Va com2 Ta node Ta Ta
diff --git a/usr.sbin/bhyve/bootrom.h b/usr.sbin/bhyve/bootrom.h
--- a/usr.sbin/bhyve/bootrom.h
+++ b/usr.sbin/bhyve/bootrom.h
@@ -36,6 +36,8 @@
#include <stdint.h>
#include <limits.h>
+#include "config.h"
+
struct vmctx;
void init_bootrom(struct vmctx *ctx);
@@ -45,6 +47,6 @@
};
int bootrom_alloc(struct vmctx *ctx, size_t len, int prot, int flags,
char **region_out, uint64_t *gpa_out);
-int bootrom_loadrom(struct vmctx *ctx, const char *romfile);
+int bootrom_loadrom(struct vmctx *ctx, const nvlist_t *nvl);
#endif
diff --git a/usr.sbin/bhyve/bootrom.c b/usr.sbin/bhyve/bootrom.c
--- a/usr.sbin/bhyve/bootrom.c
+++ b/usr.sbin/bhyve/bootrom.c
@@ -191,19 +191,33 @@
}
int
-bootrom_loadrom(struct vmctx *ctx, const char *romfile)
+bootrom_loadrom(struct vmctx *ctx, const nvlist_t *nvl)
{
struct stat sbuf;
ssize_t rlen;
off_t rom_size, var_size, total_size;
- char *ptr, *varfile;
+ char *ptr, *romfile;
int fd, varfd, i, rv;
+ const char *bootrom, *varfile;
rv = -1;
varfd = -1;
- varfile = strdup(romfile);
- romfile = strsep(&varfile, ",");
+ bootrom = get_config_value_node(nvl, "bootrom");
+ if (bootrom == NULL) {
+ return (-1);
+ }
+
+ /*
+ * get_config_value_node may use a thread local buffer to return
+ * variables. So, when we query the second variable, the first variable
+ * might get overwritten. For that reason, the bootrom should be
+ * duplicated.
+ */
+ romfile = strdup(bootrom);
+ if (romfile == NULL) {
+ return (-1);
+ }
fd = open(romfile, O_RDONLY);
if (fd < 0) {
@@ -212,6 +226,16 @@
goto done;
}
+ if (fstat(fd, &sbuf) < 0) {
+ EPRINTLN("Could not fstat bootrom file \"%s\": %s", romfile,
+ strerror(errno));
+ goto done;
+ }
+
+ rom_size = sbuf.st_size;
+
+ varfile = get_config_value_node(nvl, "bootvars");
+ var_size = 0;
if (varfile != NULL) {
varfd = open(varfile, O_RDWR);
if (varfd < 0) {
@@ -219,23 +243,14 @@
"\"%s\": %s\n", varfile, strerror(errno));
goto done;
}
- }
-
- if (fstat(fd, &sbuf) < 0) {
- EPRINTLN("Could not fstat bootrom file \"%s\": %s",
- romfile, strerror(errno));
- goto done;
- }
- rom_size = sbuf.st_size;
- if (varfd < 0) {
- var_size = 0;
- } else {
if (fstat(varfd, &sbuf) < 0) {
- fprintf(stderr, "Could not fstat bootrom variable file \"%s\": %s\n",
- varfile, strerror(errno));
+ fprintf(stderr,
+ "Could not fstat bootrom variable file \"%s\": %s\n",
+ varfile, strerror(errno));
goto done;
}
+
var_size = sbuf.st_size;
}
@@ -291,7 +306,10 @@
rv = 0;
done:
+ if (varfd >= 0)
+ close(varfd);
if (fd >= 0)
close(fd);
+ free(romfile);
return (rv);
}
diff --git a/usr.sbin/bhyve/pci_lpc.c b/usr.sbin/bhyve/pci_lpc.c
--- a/usr.sbin/bhyve/pci_lpc.c
+++ b/usr.sbin/bhyve/pci_lpc.c
@@ -36,6 +36,7 @@
#include <machine/vmm.h>
#include <machine/vmm_snapshot.h>
+#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -95,13 +96,24 @@
{
int unit, error;
char *str, *cpy, *lpcdev, *node_name;
+ const char *romfile, *varfile;
error = -1;
str = cpy = strdup(opts);
lpcdev = strsep(&str, ",");
if (lpcdev != NULL) {
if (strcasecmp(lpcdev, "bootrom") == 0) {
- set_config_value("lpc.bootrom", str);
+ romfile = strsep(&str, ",");
+ if (romfile == NULL) {
+ errx(4, "invalid bootrom option \"%s\"", opts);
+ }
+ set_config_value("lpc.bootrom", romfile);
+
+ varfile = strsep(&str, ",");
+ if (varfile != NULL) {
+ set_config_value("lpc.bootvars", varfile);
+ }
+
error = 0;
goto done;
}
@@ -204,13 +216,14 @@
{
struct lpc_uart_softc *sc;
struct inout_port iop;
- const char *backend, *name, *romfile;
+ const char *backend, *name;
char *node_name;
int unit, error;
+ const nvlist_t *nvl;
- romfile = get_config_value("lpc.bootrom");
- if (romfile != NULL) {
- error = bootrom_loadrom(ctx, romfile);
+ nvl = find_config_node("lpc");
+ if (nvl != NULL && nvlist_exists(nvl, "bootrom")) {
+ error = bootrom_loadrom(ctx, nvl);
if (error)
return (error);
}

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