On Fri, 31 Jan 2025 17:55:07 -0800, Sean Christopherson wrote:
> Fix a variety of bugs related to emulating instructions on behalf of L2,
> and (finally) add support for synthesizing nested VM-Exit to L1 when L1
> wants to intercept an instruction (KVM currently injects a #UD into L2).
>
> There's no real motivation behind this series. I spotted the PAUSE_EXITING
> vs. BUS_LOCK_DETECTION goof when sorting out a report/question about HLT
> emulation in L2 doing weird things, and then stupidly thought "how hard can
> it be to generate a VM-Exit?". Turns out, not that hard, but definitely
> a bit harder than I was anticipating due to the annoying RIP vs. next RIP
> flaw.
>
> [...]
Applied to kvm-x86 misc, thanks!
[01/11] KVM: nVMX: Check PAUSE_EXITING, not BUS_LOCK_DETECTION, on PAUSE emulation
https://github.com/kvm-x86/linux/commit/f002a97ec8c9
[02/11] KVM: nSVM: Pass next RIP, not current RIP, for nested VM-Exit on emulation
https://github.com/kvm-x86/linux/commit/c8e612bfedff
[03/11] KVM: nVMX: Allow emulating RDPID on behalf of L2
https://github.com/kvm-x86/linux/commit/3244616aac8d
[04/11] KVM: nVMX: Emulate HLT in L2 if it's not intercepted
https://github.com/kvm-x86/linux/commit/f43f7a215af0
[05/11] KVM: nVMX: Consolidate missing X86EMUL_INTERCEPTED logic in L2 emulation
https://github.com/kvm-x86/linux/commit/08e3d89eb330
[06/11] KVM: x86: Plumb the src/dst operand types through to .check_intercept()
https://github.com/kvm-x86/linux/commit/407d03fe924c
[07/11] KVM: x86: Plumb the emulator's starting RIP into nested intercept checks
https://github.com/kvm-x86/linux/commit/9aeb9d8a6738
[08/11] KVM: x86: Add a #define for the architectural max instruction length
https://github.com/kvm-x86/linux/commit/d4aea23fd0ff
[09/11] KVM: nVMX: Allow the caller to provide instruction length on nested VM-Exit
https://github.com/kvm-x86/linux/commit/fbd1e0f19546
[10/11] KVM: nVMX: Synthesize nested VM-Exit for supported emulation intercepts
https://github.com/kvm-x86/linux/commit/79a14afc6090
[11/11] KVM: selftests: Add a nested (forced) emulation intercept test for x86
https://github.com/kvm-x86/linux/commit/2428865bf0af
--
https://github.com/kvm-x86/linux/tree/next
