Re: [PATCH 2/2] KVM: x86: Fix split-irqchip vs interrupt injection window request

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On 12/04/21 23:43, Sean Christopherson wrote:
where kvm_arch_interrupt_allowed() checks EFLAGS.IF (and an edge case related to
nested virtualization).  KVM also captures EFLAGS.IF in vcpu->run->if_flag.
For whatever reason, QEMU checks both vcpu->run flags before injecting an IRQ,
maybe to handle a case where QEMU itself clears EFLAGS.IF?

It's mostly obsolete code (that will be deprecated in the next version and removed in about a year) so I wouldn't read much into it. if_flag itself is obsolete; it is not provided by SEV-ES, and a useless subset of ready_for_interrupt_injection.

Paolo




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