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| author | Radim Krčmář <rkrcmar@redhat.com> | 2015-05-22 19:22:10 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-05-28 10:43:36 +0200 |
| commit | c028dd6bb648251b773f900f59e53544278b3b3c (patch) | |
| tree | 719aa8e5f1e8d6ef4545cfbed953da92c77ee461 /arch/x86/kvm/lapic.c | |
| parent | 257b9a5faab5849fa61f1a523b429dc279d33cc3 (diff) | |
| download | linux-c028dd6bb648251b773f900f59e53544278b3b3c.tar.bz2 | |
KVM: x86: preserve x2APIC LDR on INIT
Logical x2APIC stops working if we rewrite it with zeros.
The best references are SDM April 2015: 10.12.10.1 Logical Destination
Mode in x2APIC Mode
[...], the LDR are initialized by hardware based on the value of
x2APIC ID upon x2APIC state transitions.
and SDM April 2015: 10.12.10.2 Deriving Logical x2APIC ID from the Local
x2APIC ID
The LDR initialization occurs whenever the x2APIC mode is enabled
Signed-off-by: Radim KrÄmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/lapic.c')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index c2a7d8a7a414..c789e00dfa8b 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1594,7 +1594,8 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event) apic_set_reg(apic, APIC_DFR, 0xffffffffU); apic_set_spiv(apic, 0xff); apic_set_reg(apic, APIC_TASKPRI, 0); - kvm_apic_set_ldr(apic, 0); + if (!apic_x2apic_mode(apic)) + kvm_apic_set_ldr(apic, 0); apic_set_reg(apic, APIC_ESR, 0); apic_set_reg(apic, APIC_ICR, 0); apic_set_reg(apic, APIC_ICR2, 0); |