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Date: Tue, 13 Feb 2018 16:17:01 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: Christian Borntraeger <borntraeger@...ibm.com>, David Rientjes <rientjes@...gle.com>, Radim Krčmář <rkrcmar@...hat.com> Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: Re: [patch] kvm: suppress KVM_SET_GSI_ROUTING allocation failure On 13/02/2018 16:14, Christian Borntraeger wrote: > On 02/08/2018 10:35 PM, David Rientjes wrote: >> The KVM_SET_GSI_ROUTING ioctl does a vmalloc() of >> sizeof(struct kvm_irq_routing_entry) multiplied by a user-supplied value. >> This can be up to 4096 entries on architectures such as arm64 and s390 >> (and the upper bound may be increased on s390 eventually). >> >> This can produce a vmalloc allocation failure warning: >> > [...] >> kvm_vm_ioctl+0x910/0x15e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4153 > > ^^^^^ > >> @@ -3063,7 +3063,8 @@ static long kvm_vm_ioctl(struct file *filp, > > ^^^^^ > > > Are you sure that you got the right vmalloc? Nice catch! But well, it's the only one in the whole file. :) That seems very much like an old patch then. I'm unqueuing it. Paolo
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