Messages in this thread |  | | Date | Thu, 15 Mar 2018 18:28:52 +0100 | From | Radim Krčmář <> | Subject | Re: [PATCH v3 7/7] x86/kvm: use Enlightened VMCS when running on Hyper-V |
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2018-03-15 18:02+0100, Radim Krčmář: > We actually already have mov in the assembly: > > "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t"
Oh hell, I didn't pay attention to this line before.
> "je 1f \n\t" > "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t" // here > __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
I bet this path is executed only once in VM's lifetime and what we're doing is wasting more resources than we're ever going to save ...
> "1: \n\t"
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