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| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-10-02 13:53:24 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-10-02 19:26:11 +0200 |
| commit | f439ed27f8b8b90d243ae15acb193d37f96eebe0 (patch) | |
| tree | 0154d436db2d1ebfdd1e29e41147e745a2380f0b /arch/x86/kvm/x86.c | |
| parent | a74b7d5514d61bca6aee32f60a79dacf1d2b3cac (diff) | |
| download | lwn-f439ed27f8b8b90d243ae15acb193d37f96eebe0.tar.gz lwn-f439ed27f8b8b90d243ae15acb193d37f96eebe0.zip | |
kvm: do not handle APIC access page if in-kernel irqchip is not in use
This fixes the following OOPS:
loaded kvm module (v3.17-rc1-168-gcec26bc)
BUG: unable to handle kernel paging request at fffffffffffffffe
IP: [<ffffffff81168449>] put_page+0x9/0x30
PGD 1e15067 PUD 1e17067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
[<ffffffffa063271d>] ? kvm_vcpu_reload_apic_access_page+0x5d/0x70 [kvm]
[<ffffffffa013b6db>] vmx_vcpu_reset+0x21b/0x470 [kvm_intel]
[<ffffffffa0658816>] ? kvm_pmu_reset+0x76/0xb0 [kvm]
[<ffffffffa064032a>] kvm_vcpu_reset+0x15a/0x1b0 [kvm]
[<ffffffffa06403ac>] kvm_arch_vcpu_setup+0x2c/0x50 [kvm]
[<ffffffffa062e540>] kvm_vm_ioctl+0x200/0x780 [kvm]
[<ffffffff81212170>] do_vfs_ioctl+0x2d0/0x4b0
[<ffffffff8108bd99>] ? __mmdrop+0x69/0xb0
[<ffffffff812123d1>] SyS_ioctl+0x81/0xa0
[<ffffffff8112a6f6>] ? __audit_syscall_exit+0x1f6/0x2a0
[<ffffffff817229e9>] system_call_fastpath+0x16/0x1b
Code: c6 78 ce a3 81 4c 89 e7 e8 d9 80 ff ff 0f 0b 4c 89 e7 e8 8f f6 ff ff e9 fa fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 <48> f7 07 00 c0 00 00 55 48 89 e5 75 1e 8b 47 1c 85 c0 74 27 f0
RIP [<ffffffff81193045>] put_page+0x5/0x50
when not using the in-kernel irqchip ("-machine kernel_irqchip=off"
with QEMU). The fix is to make the same check in
kvm_vcpu_reload_apic_access_page that we already have
in vmx.c's vm_need_virtualize_apic_accesses().
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Fixes: 4256f43f9fab91e1c17b5846a240cf4b66a768a8
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 6857257f3810..5430e4b0af29 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6030,6 +6030,9 @@ void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) { struct page *page = NULL; + if (!irqchip_in_kernel(vcpu->kvm)) + return; + if (!kvm_x86_ops->set_apic_access_page_addr) return; |