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KVM: x86: avoid logical_map when it is invalid

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We want to support mixed modes and the easiest solution is to avoid
optimizing those weird and unlikely scenarios.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Message-Id: <1423766494-26150-4-git-send-email-rkrcmar@redhat.com>
[Add comment above KVM_APIC_MODE_* defines. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář
2015-02-12 19:41:33 +01:00
committed by Paolo Bonzini
parent 9ea369b032
commit 3548a259f6
2 changed files with 35 additions and 1 deletions
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12
arch/x86/include/asm/kvm_host.h
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@@ -548,8 +548,20 @@ struct kvm_arch_memory_slot {
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
};
/*
* We use as the mode the number of bits allocated in the LDR for the
* logical processor ID. It happens that these are all powers of two.
* This makes it is very easy to detect cases where the APICs are
* configured for multiple modes; in that case, we cannot use the map and
* hence cannot use kvm_irq_delivery_to_apic_fast either.
*/
#define KVM_APIC_MODE_XAPIC_CLUSTER 4
#define KVM_APIC_MODE_XAPIC_FLAT 8
#define KVM_APIC_MODE_X2APIC 16
struct kvm_apic_map {
struct rcu_head rcu;
u8 mode;
u8 ldr_bits;
/* fields bellow are used to decode ldr values in different modes */
u32 cid_shift, cid_mask, lid_mask;