[Bug 244733] pci passthrough doesn't work upgrading from 12.0 to 12.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244733

            Bug ID: 244733
           Summary: pci passthrough doesn't work upgrading from 12.0 to
                    12.1
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: nospam at ofloo.net

Created attachment 212325
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212325&action=edit
dmesg

When I first install kernel and reboot pci passthrough still works. However
after I've done installworld and mergemaster -iU reboot and I get this error.
In vm-bhyve log

Mar 07 10:16:51: initialising
Mar 07 10:16:51:  [loader: bhyveload]
Mar 07 10:16:51:  [cpu: 4]
Mar 07 10:16:51:  [memory: 2048M]
Mar 07 10:16:51:  [hostbridge: standard]
Mar 07 10:16:51:  [com ports: com1]
Mar 07 10:16:51:  [uuid: ae337462-f766-11e7-8028-ac1f6b45bb3c]
Mar 07 10:16:51:  [utctime: yes]
Mar 07 10:16:51:  [debug mode: no]
Mar 07 10:16:51:  [primary disk: disk0]
Mar 07 10:16:51:  [primary disk dev: sparse-zvol]
Mar 07 10:16:53: fatal; pci passthrough not supported on this system (no VT-d
or amdvi)

acpidump shows

#acpidump -t DMAR
/*
  RSD PTR: OEM=SUPERM, ACPI_Rev=2.0x (2)
    XSDT=0x000000007e172098, length=36, cksum=143
*/
/*
  XSDT: Length=180, Revision=1, Checksum=178,
    OEMID=SUPERM, OEM Table ID=SMCI--MB, OEM Revision=0x1072009,
    Creator ID=AMI, Creator Revision=0x10013
    Entries={ 0x000000007e176b58, 0x000000007e176c70, 0x000000007e176cb8,
0x000000007e176d58, 0x000000007e176da0, 0x000000007e176de0, 0x000000007e176f90,
0x000000007e177008, 0x000000007e177038, 0x000000007e177070, 0x000000007e1770b8,
0x000000007e1789c0, 0x000000007e178a30, 0x000000007e178a68, 0x000000007e178b10,
0x000000007e178b40, 0x000000007e178d70, 0x000000007e178ec0 }
*/
/*
  FACP: Length=276, Revision=6, Checksum=154,
    OEMID=SUPERM, OEM Table ID=SMCI--MB, OEM Revision=0x1072009,
    Creator ID=AMI, Creator Revision=0x10013
     FACS=0x7e1be080, DSDT=0x0
    INT_MODEL=APIC
    Preferred_PM_Profile=Enterprise Server (4)
    SCI_INT=9
    SMI_CMD=0xb2, ACPI_ENABLE=0xa0, ACPI_DISABLE=0xa1, S4BIOS_REQ=0x0
    PSTATE_CNT=0x0
    PM1a_EVT_BLK=0x0-0x3
    PM1a_CNT_BLK=0x0-0x1
    PM_TMR_BLK=0x0-0x3
    P_LVL2_LAT=101 us, P_LVL3_LAT=1001 us
    FLUSH_SIZE=1024, FLUSH_STRIDE=16
    DUTY_OFFSET=1, DUTY_WIDTH=3
    DAY_ALRM=13, MON_ALRM=0, CENTURY=0
    IAPC_BOOT_ARCH={LEGACY_DEVICES}
   
Flags={WBINVD,C1_SUPPORTED,SLEEP_BUTTON,S4_RTC_WAKE,RESET_REGISTER,PLATFORM_CLOCK,REMOTE_POWER_ON}
    RESET_REG=0xcf9:0[8] (IO), RESET_VALUE=0xe
*/
/*
  FACS:    Length=64, HwSig=0x00000060, Firm_Wake_Vec=0x00000000
    Global_Lock=
    Flags=
    Version=2
*/
acpidump: DSDT is corrupt

When I rollback to 12.0 everything works again? So clearly it's not a bios
setting.

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