Re: panic in wscons booting current evbarm64 iso under virtualization on Apple Silicon

[PHO <pho%cielonegro.org@localhost>]

On 10/26/26 09:52, John Klos wrote:

> [   1.0000000] fp ffffc000010262e0 vm_cmd() at ffffc000003fa3b8 
> netbsd:vm_cmd+0x28
> [   1.0000000] fp ffffc000010262f0 vmt_probe() at ffffc000003fb89c 
> netbsd:vmt_probe+0x3c
> [   1.0000000] fp ffffc00001026340 vmt_match() at ffffc000000a572c 
> netbsd:vmt_match+0x1c
This is definitely a separate issue, and it really looks like a UTM/QEMU 
bug to me. The function vmt_probe() does this to test whether it's 
running on VMware or not, and no instructions are illegal according to 
the ARM documentation:

[from sys/dev/vmt/vmtvar.h]

#define BACKDOOR_OP_AARCH64(op, frame)		\
	__asm__ __volatile__ (			\
		"ldp x0, x1, [%0, 8 * 0];	\n\t" \
		"ldp x2, x3, [%0, 8 * 2];	\n\t" \
		"ldp x4, x5, [%0, 8 * 4];	\n\t" \
		"ldr x6,     [%0, 8 * 6];	\n\t" \
		"mov x7, %1			\n\t" \
		"movk x7, %2, lsl #32;		\n\t" \
		"mrs xzr, mdccsr_el0;		\n\t" \
		"stp x0, x1, [%0, 8 * 0];	\n\t" \
		"stp x2, x3, [%0, 8 * 2];	\n\t" \
		"stp x4, x5, [%0, 8 * 4];	\n\t" \
		"str x6,     [%0, 8 * 6];	\n\t" \
		: /* No outputs. */ \
		: "r" (frame), \
		  "r" (op), \
		  "i" (X86_IO_MAGIC) \
		: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", "memory" \
	)

You can probably work around it by commenting out this line from your 
kernel:

vmt0            at cpu0                 # VMware Tools