[Bug 239835] emulators/virtualbox-ose doesn't recognize AMD Ryzen 7 3800X "SVM" feature - won't allow 64-bit guests

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[Bug 239835] emulators/virtualbox-ose doesn't recognize AMD Ryzen 7 3800X "SVM" feature - won't allow 64-bit guests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239835

            Bug ID: 239835
           Summary: emulators/virtualbox-ose doesn't recognize AMD Ryzen 7
                    3800X "SVM" feature - won't allow 64-bit guests
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: [hidden email]
          Reporter: [hidden email]
             Flags: maintainer-feedback?([hidden email])
          Assignee: [hidden email]

Created attachment 206506
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=206506&action=edit
Screen shot showing CPU type selections are now 32-bit only

H/W: AMD Ryzen 7 3800X CPU, MSI MEG X570 ACE MB (no option to enable or disable
virtualization)

Relevant DMESG line:
AMDFeatures2=0x75c237ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX,

AMD Virtualization Reference:
https://en.wikipedia.org/wiki/X86_virtualization#AMD_virtualization_(AMD-V)

Relevant text:
'The CPU flag for AMD-V is "svm". This may be checked in BSD derivatives via
dmesg or sysctl and in Linux via /proc/cpuinfo.'

Previously created 64-bit VBox machines on earlier H/W and VBox are no longer
"defined" as 64-bit machines. All machine type selections are now 32-bit only
(see 'FBSD-VBox-5.2.18_no_64_bit.png' screen shot).

Attempting to start a previously configured 64-bit VM now results in an error
message (see 'FBSD-VBox-5.2.18_no_VTx_AMD-V_HW.png' screen shot) which further
informs that CPU virtualization support is "missing".

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