Comments (6)
tandasat
commented on June 9, 2024
While VM-exit is being processed, any interruptions should not be allowed, as the processor is on the more privileged code and we do not want it to run arbitrary kernel code. So 2 is correct (actually, should not be dispatched to anyone else)
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mutiancheng
commented on June 9, 2024
When VM-exit occurs, if IF=1 and IRQL<DISPATCH_LEVEL, how can you ensure that the current CPU will not to be dispatched to run another thread?
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tandasat
commented on June 9, 2024
A host's (VMM's) flag register is loaded from VMCS and not affected by
guest's status.Also, the IF flag is always cleared for the host if I recall
correctly (I was not able to find the statement in the SDM, so could be
wrong). If interrupts are disabled, a thread is not dispatched as timer
interrupt does not occur.
Best,
Satoshi
…On Fri, Mar 3, 2017 at 5:49 PM, mutiancheng ***@***.***> wrote:
When VM-exit occurs, if IF=1 and IRQL<DISPATCH_LEVEL, how can you ensure
that the current CPU will not to be dispatched to run another thread?
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tandasat
commented on June 9, 2024
Sorry, I gave you an wrong answer. As "Loading Host RIP, RSP, and RFLAGS"
states, RFLAGS is cleared, except bit 1, which is always set. So the TF flag is always zero, unless you manually enable it.
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mutiancheng
commented on June 9, 2024
Yes, I observed it with WinDbg. Thank you for your patience and attentiveness. Is the statement in the SDM? I will read it.
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tandasat
commented on June 9, 2024
No problem :) and yes, that is in the SDM.
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