KVM: x86: WARN if KVM emulates an IPI without clearing the BUSY flag

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WARN if KVM emulates an IPI without clearing the BUSY flag, failure to do
so could hang the guest if it waits for the IPI be sent.

Opportunistically use APIC_ICR_BUSY macro instead of open coding the
magic number, and add a comment to clarify why kvm_recalculate_apic_map()
is unconditionally invoked (it's really, really confusing for IPIs due to
the existence of fast paths that don't trigger a potential recalc).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220204214205.3306634-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Sean Christopherson 2022-02-04 21:42:00 +00:00 • committed by Paolo Bonzini

parent b51818afdc

commit bd17f417c0

2 changed files with 13 additions and 6 deletions

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10

arch/x86/kvm/lapic.c

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9

arch/x86/kvm/x86.c

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