On Thu, 21 Mar 2024 11:24:42 +0300 Daniil Tatianin <d-tatianin@xxxxxxxxxxxxxx> wrote: > We would like to be able to create large VMs (up to 224 vCPUs atm) with > up to 128 virtio-net cards, where each card needs a TX+RX queue per vCPU > for optimal performance (as well as config & control interrupts per > card). Adding in extra virtio-blk controllers with a queue per vCPU (up > to 192 disks) yields a total of about ~100k IRQ routes, rounded up to > 128k for extra headroom and flexibility. > > The current limit of 4096 was set in 2018 and is too low for modern > demands. It also seems to be there for no good reason as routes are > allocated lazily by the kernel anyway (depending on the largest GSI > requested by the VM). > > Signed-off-by: Daniil Tatianin <d-tatianin@xxxxxxxxxxxxxx> LGTM Acked-by: Igor Mammedov <imammedo@xxxxxxxxxx> > --- > include/linux/kvm_host.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 48f31dcd318a..10a141add2a8 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -2093,7 +2093,7 @@ static inline bool mmu_invalidate_retry_gfn_unsafe(struct kvm *kvm, > > #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING > > -#define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */ > +#define KVM_MAX_IRQ_ROUTES 131072 /* might need extension/rework in the future */ > > bool kvm_arch_can_set_irq_routing(struct kvm *kvm); > int kvm_set_irq_routing(struct kvm *kvm,
