VirtualBox

Changes between Initial Version and Version 1 of Ticket #19171, comment 15


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Timestamp:
02/01/2020 02:05:20 AM (2 years ago)
Author:
ramshankar
Comment:

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  • Ticket #19171, comment 15

    initial v1  
    33It seems increasing the VCPU count really helps because it seems to drastically increase the chance of the VMM exiting to ring-3. And the bug (regression) is precisely *only* in the exit-to-ring 3 scenario when ICEBP #DB VM-exits occurs. 
    44 
    5 We incorrectly reset the instruction length of the faulting ICEBP instruction while exiting to ring-3 and while restoring it, it would be restored as 0xff. Hence VT-x rightly complained that the instruction length is incorrect (should be 0-15). 
     5The instruction length of the faulting ICEBP instruction while exiting to ring-3 was incorrectly being reset. Thus while restoring it on re-entry in ring-0, it gets restored as 0xff. Hence VT-x rightly complained that the instruction length is incorrect (should be 0-15). 
    66 
    77The fix will be available in the next maintenance release of VirtualBox. 

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