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openSUSE:Evergreen:11.1:kernel-2.6.32
xen
19595-hvm-set-callback-irq-level.patch
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File 19595-hvm-set-callback-irq-level.patch of Package xen
# HG changeset patch # User Keir Fraser <keir.fraser@citrix.com> # Date 1241779812 -3600 # Node ID 2656ab6fa8286832ca7de3082d72e2406097f3ff # Parent bf946cc3008bcb927bf28de87160cc4ec2b180c0 x86 hvm: hvm_set_callback_irq_level() must not be called in IRQ context or with IRQs disabled. Ensure this by deferring to tasklet (softirq) context if required. Signed-off-by: Keir Fraser <keir.fraser@citrix.com> --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -685,6 +685,10 @@ int hvm_vcpu_initialise(struct vcpu *v) if ( rc != 0 ) goto fail3; + tasklet_init(&v->arch.hvm_vcpu.assert_evtchn_irq_tasklet, + (void(*)(unsigned long))hvm_assert_evtchn_irq, + (unsigned long)v); + v->arch.guest_context.user_regs.eflags = 2; if ( v->vcpu_id == 0 ) @@ -714,6 +718,7 @@ int hvm_vcpu_initialise(struct vcpu *v) void hvm_vcpu_destroy(struct vcpu *v) { + tasklet_kill(&v->arch.hvm_vcpu.assert_evtchn_irq_tasklet); hvm_vcpu_cacheattr_destroy(v); vlapic_destroy(v); hvm_funcs.vcpu_destroy(v); --- a/xen/arch/x86/hvm/irq.c +++ b/xen/arch/x86/hvm/irq.c @@ -185,8 +185,16 @@ void hvm_maybe_deassert_evtchn_irq(void) void hvm_assert_evtchn_irq(struct vcpu *v) { - if ( v->vcpu_id == 0 ) - hvm_set_callback_irq_level(v); + if ( v->vcpu_id != 0 ) + return; + + if ( unlikely(in_irq() || !local_irq_is_enabled()) ) + { + tasklet_schedule(&v->arch.hvm_vcpu.assert_evtchn_irq_tasklet); + return; + } + + hvm_set_callback_irq_level(v); } void hvm_set_pci_link_route(struct domain *d, u8 link, u8 isa_irq) --- a/xen/include/asm-x86/hvm/vcpu.h +++ b/xen/include/asm-x86/hvm/vcpu.h @@ -65,6 +65,8 @@ struct hvm_vcpu { struct arch_svm_struct svm; } u; + struct tasklet assert_evtchn_irq_tasklet; + struct mtrr_state mtrr; u64 pat_cr;
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