The branch main has been updated by cperciva:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=c4a4011c744a8e75892d126702a825e617d9e064

commit c4a4011c744a8e75892d126702a825e617d9e064
Author:     Colin Percival <[email protected]>
AuthorDate: 2022-08-13 00:56:30 +0000
Commit:     Colin Percival <[email protected]>
CommitDate: 2022-10-18 06:02:22 +0000

    PVH: support whitespace cmdline splitting
    
    For historical reasons, Xen kernel command lines have options
    separated by commas.  Every other FreeBSD platform uses whitespace;
    this is also necessary in PVH in order to support the Firecracker
    VMM.  Allow options to be separated by any combination of commas
    and whitespace.
    
    Reviewed by:    imp
    Sponsored by:   https://www.patreon.com/cperciva
    Differential Revision:  https://reviews.freebsd.org/D36190
---
 sys/x86/xen/pv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/x86/xen/pv.c b/sys/x86/xen/pv.c
index b81423a1be88..162504f5120c 100644
--- a/sys/x86/xen/pv.c
+++ b/sys/x86/xen/pv.c
@@ -419,7 +419,7 @@ xen_pvh_parse_preload_data(uint64_t modulep)
                if (start_info->cmdline_paddr != 0)
                        boot_parse_cmdline_delim(
                            (char *)(start_info->cmdline_paddr + KERNBASE),
-                           ",");
+                           ", \t\n");
                kmdp = NULL;
                strlcpy(bootmethod, "XEN", sizeof(bootmethod));
        }

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