On Mon, 8 Aug 2016 16:57:14 +0800 Peter Xu <pet...@redhat.com> wrote:
> On Mon, Aug 08, 2016 at 03:41:23PM +0800, Chao Gao wrote: > > HI, everyone. > > > > We have done some tests after merging this patch set into the lastest qemu > > master. In kvm aspect, we use the lastest kvm linux-next branch. Here are > > some problems we have met. > > > > 1. We can't boot up a 288 vcpus linux guest with CLI: > > qemu-system-x86_64 -boot c -m 4096 -sdl -monitor pty --enable-kvm \ > > -M kernel-irqchip=split -serial stdio -bios bios.bin -smp cpus=288 \ > > -hda vdisk.img -device intel-iommu,intremap=on -machine q35. > > The problem exists, even after we only assign 32 vcpus to the linux guest. > > Maybe the output "do_IRQ: 146.113 No irq handler for vector (irq -1)" is a > > clue. > > The output of qemu and kernel is in attachments. Do you have any idea > > about the problem and how to solve it? > > IIUC, we need to wait for Radim's QEMU patches to finally enable 288 > vcpus? > > Btw, could you please try adding this to the QEMU cmdline when testing > with 32 vcpus: > > -global ioapic.version=0x20 > > I see that you were running RHEL 7.2 guest with a default e1000. In > that case, we may need to boost ioapic version to 0x20. > > Thanks, > > -- peterx Peter, Upstream guest kernel 4.7.0+ (d52bd54db) crashes when booting with irq remapping on: ./qemu-system-x86_64 -enable-kvm -smp 1,sockets=9,cores=32,threads=1,maxcpus=288 -device qemu64-x86_64-cpu,socket-id=8,core-id=30,thread-id=0 -bios x2apic_bios.bin -m 1G -nographic -device intel-iommu,intremap=on -machine q35,kernel-irqchip=split -snapshot -global ioapic.version=0x20 /dev/rhel72 [ 0.350669] smpboot: Max logical packages: 9 [ 0.351853] smpboot: APIC(0) Converting physical 0 to logical package 0 [ 0.353160] smpboot: APIC(11e) Converting physical 8 to logical package 1 [ 0.354627] DMAR: Host address width 39 [ 0.355621] DMAR: DRHD base: 0x000000fed90000 flags: 0x1 [ 0.356785] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 12008c22260206 ecap f00f1a [ 0.358721] DMAR-IR: IOAPIC id 0 under DRHD base 0xfed90000 IOMMU 0 [ 0.360029] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping. [ 0.364605] DMAR-IR: Enabled IRQ remapping in x2apic mode [ 0.365805] BUG: unable to handle kernel NULL pointer dereference at (null) [ 0.367965] IP: [<ffffffff8105b025>] x2apic_cluster_probe+0x35/0x70 [ 0.369373] PGD 0 [ 0.370258] Oops: 0002 [#1] SMP [ 0.371140] Modules linked in: [ 0.372150] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.7.0+ #647 [ 0.373485] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.9.0-143-gbac87e4 04/01/2014 [ 0.375622] task: ffff880039ad0000 task.stack: ffff880039ad8000 [ 0.376875] RIP: 0010:[<ffffffff8105b025>] [<ffffffff8105b025>] x2apic_cluster_probe+0x35/0x70 [ 0.379066] RSP: 0000:ffff880039adbe28 EFLAGS: 00010202 [ 0.380299] RAX: 0000000000000000 RBX: ffffffff81f388a8 RCX: ffff880039e00000 [ 0.381677] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000246 [ 0.383096] RBP: ffff880039adbe28 R08: 00000000000000c6 R09: ffff8800000b9b80 [ 0.384579] R10: 00000000000000a0 R11: 0000000000000050 R12: 0000000000002000 [ 0.385990] R13: 000000000000a118 R14: 000000000000011f R15: 0000000000000120 [ 0.387448] FS: 0000000000000000(0000) GS:ffff880039e00000(0000) knlGS:0000000000000000 [ 0.389454] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.390697] CR2: 0000000000000000 CR3: 0000000001c06000 CR4: 00000000000006f0 [ 0.392114] Stack: [ 0.392889] ffff880039adbe40 ffffffff81da277c 000000000000a110 ffff880039adbe78 [ 0.395135] ffffffff81d9c055 ffffffff81f14c60 ffff880039ad0a58 ffffffff81c95ac0 [ 0.397469] ffffffff818232c0 ffff880039ad0000 ffff880039adbf38 ffffffff81d86293 [ 0.399695] Call Trace: [ 0.400529] [<ffffffff81da277c>] default_setup_apic_routing+0x28/0x69 [ 0.401881] [<ffffffff81d9c055>] native_smp_prepare_cpus+0x223/0x2d2 [ 0.403260] [<ffffffff81d86293>] kernel_init_freeable+0xd8/0x249 [ 0.404525] [<ffffffff816d1b2e>] kernel_init+0xe/0x110 [ 0.405703] [<ffffffff816deb3f>] ret_from_fork+0x1f/0x40 [ 0.406966] [<ffffffff816d1b20>] ? rest_init+0x80/0x80 [ 0.408165] Code: 00 31 c0 65 8b 15 2c f1 fa 7e 85 c9 75 01 c3 48 63 ca 55 48 c7 c0 10 d7 00 00 48 8b 0c cd 20 8d d4 81 89 d2 48 89 e5 48 8b 04 08 <f0> 48 0f ab 10 49 c7 c0 60 b0 05 81 48 c7 c1 a0 ae 05 81 ba 01 [ 0.417107] RIP [<ffffffff8105b025>] x2apic_cluster_probe+0x35/0x70 [ 0.418516] RSP <ffff880039adbe28> [ 0.419461] CR2: 0000000000000000 [ 0.420386] ---[ end trace f68728a0d3053b52 ]---