diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-02-26 16:49:16 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 11:53:27 +0300 |
| commit | 71c4dfafc0932d92cc99c7e839d25174b0ce10a1 (patch) | |
| tree | 991320ed3bce4cc2665721454c7f10a69fb98b1a | |
| parent | 3e4bb3ac9e0ada5df5f6729648d403ea9f071d10 (diff) | |
KVM: detect if VCPU triple faults
In the current inject_page_fault path KVM only checks if there is another PF
pending and injects a DF then. But it has to check for a pending DF too to
detect a shutdown condition in the VCPU. If this is not detected the VCPU goes
to a PF -> DF -> PF loop when it should triple fault. This patch detects this
condition and handles it with an KVM_SHUTDOWN exit to userspace.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | arch/x86/kvm/x86.c | 20 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 1 |
2 files changed, 16 insertions, 5 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dbcff38dfcc..491eda30828 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -155,11 +155,16 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr, u32 error_code) { ++vcpu->stat.pf_guest; - if (vcpu->arch.exception.pending && vcpu->arch.exception.nr == PF_VECTOR) { - printk(KERN_DEBUG "kvm: inject_page_fault:" - " double fault 0x%lx\n", addr); - vcpu->arch.exception.nr = DF_VECTOR; - vcpu->arch.exception.error_code = 0; + if (vcpu->arch.exception.pending) { + if (vcpu->arch.exception.nr == PF_VECTOR) { + printk(KERN_DEBUG "kvm: inject_page_fault:" + " double fault 0x%lx\n", addr); + vcpu->arch.exception.nr = DF_VECTOR; + vcpu->arch.exception.error_code = 0; + } else if (vcpu->arch.exception.nr == DF_VECTOR) { + /* triple fault -> shutdown */ + set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests); + } return; } vcpu->arch.cr2 = addr; @@ -2676,6 +2681,11 @@ again: r = 0; goto out; } + if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) { + kvm_run->exit_reason = KVM_EXIT_SHUTDOWN; + r = 0; + goto out; + } } kvm_inject_pending_timer_irqs(vcpu); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 9750bb3c5a7..958e0037151 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -38,6 +38,7 @@ #define KVM_REQ_MIGRATE_TIMER 1 #define KVM_REQ_REPORT_TPR_ACCESS 2 #define KVM_REQ_MMU_RELOAD 3 +#define KVM_REQ_TRIPLE_FAULT 4 struct kvm_vcpu; extern struct kmem_cache *kvm_vcpu_cache; |