Messages in this thread | | | Date | Fri, 20 May 2022 14:58:19 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC][PATCH 9/9] arch/idle: Change arch_cpu_idle() IRQ behaviour |
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On Fri, May 20, 2022 at 01:13:22PM +0300, Kirill A. Shutemov wrote:
> So you want to call call the HLT hypercall with .irq_disabled=false and > .do_sti=false, but actual RFLAGS.IF in the guest is 0 and avoid CLI on > wake up expecting it to be cleared already, right?
Yep, just like MWAIT can, avoids pointless IF flipping.
> My reading of the spec is "don't do that". But actual behaviour is up to > VMM and TDX module implementation. VMM doens't have access to the guest > register file, so it *may* work, I donno.
Yeah, it totally *can* work, but I've no idea if they done the right thing.
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