VirtualBox

Changes between Version 2 and Version 3 of Ticket #19171, comment 15


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Timestamp:
02/01/2020 02:06:31 AM (16 months ago)
Author:
ramshankar
Comment:

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  • Ticket #19171, comment 15

    v2 v3  
    11We've finally managed to reproduce this issue. The DATEV program as well as CorelDraw X5 are affected. 
    22 
    3 It 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. 
     3It 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) exits '''only''' in the exit-to-ring 3 case when ICEBP #DB VM-exits occurs. 
    44 
    55The 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). 

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