[Bug 250802] bhyve exited with status 134 when GPU PCI passthrough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250802

--- Comment #35 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to mr.xanto from comment #34)
Ok, so D27138 cannot work because BARs are not mapped into userspace, and patch
caused infinite recursion.  Not to mention Peter' objection.

Lets try to see why EPT violation was translated to instruction assist instead
of being handled by vm_fault().

First, you use stable/12 and you do not have debugging turned on.  Please
enable
at least INVARIANTS in your kernel.

Second, I do not see how to find the cause except by some debugging.  Apply
the following patch for start and report if the printf triggered

diff --git a/sys/amd64/vmm/vmm.c b/sys/amd64/vmm/vmm.c
index 3a1d0d54bca..1e715d458a9 100644
--- a/sys/amd64/vmm/vmm.c
+++ b/sys/amd64/vmm/vmm.c
@@ -650,6 +650,7 @@ vm_mem_allocated(struct vm *vm, int vcpuid, vm_paddr_t gpa)
                        return (true);          /* 'gpa' is sysmem or devmem */
        }

+if (gpa >= 0xd0000000 && gpa < 0xe0000000) printf("ppt_is_mmio %#lx %d\n",
gpa, ppt_is_mmio(vm, gpa));
        if (ppt_is_mmio(vm, gpa))
                return (true);                  /* 'gpa' is pci passthru mmio
*/

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