On 02/05/2019 23:40, Tamas K Lengyel wrote:
>> @@ -211,13 +212,14 @@ struct vm_event_regs_x86 {
>> struct vm_event_x86_selector_reg fs;
>> struct vm_event_x86_selector_reg gs;
>> uint64_t shadow_gs;
>> + uint16_t gdtr_limit;
> Whoops, just noticed that limit actually needs 20-bits. I'll just grow
> this to 32 and drop the pad at the end.
There is no such thing as a GDT or an IDT with a limit beyond 16 bits.
(Furthermore, an IDT with a limit beyond 12 bits is just a waste of memory).
VT-x performs a consistency check on every vmentry that the
VMCS_{G,I}DTR_LIMIT fields are within 16 bits, despite being encoded as
32bit fields. SVM specifies the higher 16 bits as ignored.
~Andrew
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