KVM: x86: Explicitly track all possibilities for APIC map's logical modes

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Track all possibilities for the optimized APIC map's logical modes
instead of overloading the pseudo-bitmap and treating any "unknown" value
as "invalid".

As documented by the now-stale comment above the mode values, the values
did have meaning when the optimized map was originally added.  That
dependent logical was removed by commit e45115b62f ("KVM: x86: use
physical LAPIC array for logical x2APIC"), but the obfuscated behavior
and its comment were left behind.

Opportunistically rename "mode" to "logical_mode", partly to make it
clear that the "disabled" case applies only to the logical map, but also
to prove that there is no lurking code that expects "mode" to be a bitmap.

Functionally, this is a glorified nop.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20230106011306.85230-19-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Sean Christopherson 2023-01-06 01:12:51 +00:00 • committed by Paolo Bonzini

parent 6ea567ca00

commit 3536690101

2 changed files with 52 additions and 17 deletions

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29

arch/x86/include/asm/kvm_host.h

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40

arch/x86/kvm/lapic.c

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