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List: kvm-commits
Subject: [COMMIT master] KVM: PIT: fix pit_state copy in set_pit2/get_pit2
From: Avi Kivity <avi () redhat ! com>
Date: 2009-08-26 13:44:55
Message-ID: 20090826134455.5FAD825004A () cleopatra ! tlv ! redhat ! com
[Download RAW message or body]
From: Marcelo Tosatti <mtosatti@redhat.com>
The kvm_pit_state2 structure contains extra space, so the memcpy
in kvm_vm_ioctl_set_pit2 corrupts kvm->arch.vpit->pit_state.
Fix it by memcpy'ing the channel information and assigning flags
manually.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2e92aef..d22400f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2095,7 +2095,9 @@ static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
int r = 0;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
- memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state2));
+ memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
+ sizeof(ps->channels));
+ ps->flags = kvm->arch.vpit->pit_state.flags;
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return r;
}
@@ -2109,7 +2111,9 @@ static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
if (!prev_legacy && cur_legacy)
start = 1;
- memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state2));
+ memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
+ sizeof(kvm->arch.vpit->pit_state.channels));
+ kvm->arch.vpit->pit_state.flags = ps->flags;
kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return r;
--
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