From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruce Rogers Subject: [PATCH 2/2] KVM: x86: allow BSP to handle INIT IPIs like APs do Date: Wed, 3 Feb 2016 15:51:16 -0700 Message-ID: <1454539876-8310-2-git-send-email-brogers@suse.com> References: <1454539876-8310-1-git-send-email-brogers@suse.com> Cc: jan.kiszka@siemens.com, namit@cs.technion.ac.il, Bruce Rogers To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1454539876-8310-1-git-send-email-brogers@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org The INIT IPI event handler special cases the boot-strap processor (BSP) handling, avoiding the same mp state handling which is done for the other (AP) processors. Debugging a linux guest usage scenario of avoiding a reboot through the bios for a crash on any processor via eg: kexec -p /boot/vmlinuz --initrd=/boot/initrd --append="$(cat /proc/cmdline)\ maxcpus=1" led to identifying this change as the needed fix. With this change, an AP can now startup the BSP without error. Signed-off-by: Bruce Rogers --- arch/x86/kvm/lapic.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 36591fa..eda6bfb 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2170,10 +2170,7 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu) if (test_bit(KVM_APIC_INIT, &pe)) { kvm_lapic_reset(vcpu, true); kvm_vcpu_reset(vcpu, true); - if (kvm_vcpu_is_bsp(apic->vcpu)) - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; - else - vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; + vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; } if (test_bit(KVM_APIC_SIPI, &pe) && vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { -- 1.9.0