On Wed, Mar 11, 2015 at 10:59 PM, Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx> wrote: > * Andrey Korolyov (andrey@xxxxxxx) wrote: >> On Wed, Mar 11, 2015 at 10:33 PM, Dr. David Alan Gilbert >> <dgilbert@xxxxxxxxxx> wrote: >> > * Kevin O'Connor (kevin@xxxxxxxxxxxx) wrote: >> >> On Wed, Mar 11, 2015 at 02:45:31PM -0400, Kevin O'Connor wrote: >> >> > On Wed, Mar 11, 2015 at 02:40:39PM -0400, Kevin O'Connor wrote: >> >> > > For what it's worth, I can't seem to trigger the problem if I move the >> >> > > cmos read above the SIPI/LAPIC code (see patch below). >> >> > >> >> > Ugh! >> >> > >> >> > That's a seabios bug. Main processor modifies the rtc index >> >> > (rtc_read()) while APs try to clear the NMI bit by modifying the rtc >> >> > index (romlayout.S:transition32). >> >> > >> >> > I'll put together a fix. >> >> >> >> The seabios patch below resolves the issue for me. >> > >> > Thanks! Looks good here. >> > >> > Andrey, Paolo, Bandan: Does it fix it for you as well? >> > >> >> Thanks Kevin, Dave, >> >> I`m afraid that I`m hitting something different not only because >> different suberror code but also because of mine version of seabios - >> I am using 1.7.5 and corresponding code in the proposed patch looks >> different - there is no smp-related code patch is about of. Those >> mentioned devices went to production successfully and I`m afraid I >> cannot afford playing on them anymore, even if I re-trigger the issue >> with patched 1.8.1-rc, there is no way to switch to a different kernel >> and retest due to specific conditions of this production suite. I`ve >> ordered a pair of new shoes^W 2620v2-s which should arrive to me next > > Well I was testing on a pair of 'E5-2620 v2'; but as you saw my test case > was pretty simple. If you can suggest any flags I should add etc to the > test I'd be happy to give it a go. > > Dave Here is mine launch string: qemu-system-x86_64 -enable-kvm -name vmtest -S -machine pc-i440fx-2.1,accel=kvm,usb=off -cpu SandyBridge,+kvm_pv_eoi -m 512 -realtime mlock=off -smp 12,sockets=1,cores=12,threads=12 -numa node,nodeid=0,cpus=0-11,mem=512 -nographic -no-user-config -nodefaults -device sga -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device nec-usb-xhci,id=usb,bus=pci.0,addr=0x4 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -m 512,slots=31,maxmem=16384M -object memory-backend-ram,id=mem0,size=512M -device pc-dimm,id=dimm0,node=0,memdev=mem0 I omitted disk backend in this example, but there is a chance that my problem is not reproducible without some calls made explicitly by a bootloader (not sure what to say for mid-runtime failures). > >> Monday, so I`ll be able to test a) against 1.8.0-release, b) against >> patched bios code, c) reproduce initial error on master/3.19 (may be >> I`ll take them before weekend by going into this computer shop in >> person). Until then, I have a very deep feeling that mine issue is not >> there :) Also I became very curious on how a lack of IDT feature may >> completely eliminate the issue appearance for me, the only possible >> explanation is a clock-related race which is kinda stupid suggestion >> and unlikely to exist in nature. >> >> Thanks again for everyone for throughout testing and ideas! >> >> > >> >> -Kevin >> >> >> >> >> >> --- a/src/romlayout.S >> >> +++ b/src/romlayout.S >> >> @@ -22,7 +22,8 @@ >> >> // %edx = return location (in 32bit mode) >> >> // Clobbers: ecx, flags, segment registers, cr0, idt/gdt >> >> DECLFUNC transition32 >> >> -transition32_for_smi: >> >> +transition32_nmi_off: >> >> + // transition32 when NMI and A20 are already initialized >> >> movl %eax, %ecx >> >> jmp 1f >> >> transition32: >> >> @@ -205,7 +206,7 @@ __farcall16: >> >> entry_smi: >> >> // Transition to 32bit mode. >> >> movl $1f + BUILD_BIOS_ADDR, %edx >> >> - jmp transition32_for_smi >> >> + jmp transition32_nmi_off >> >> .code32 >> >> 1: movl $BUILD_SMM_ADDR + 0x8000, %esp >> >> calll _cfunc32flat_handle_smi - BUILD_BIOS_ADDR >> >> @@ -216,8 +217,10 @@ entry_smi: >> >> DECLFUNC entry_smp >> >> entry_smp: >> >> // Transition to 32bit mode. >> >> + cli >> >> + cld >> >> movl $2f + BUILD_BIOS_ADDR, %edx >> >> - jmp transition32 >> >> + jmp transition32_nmi_off >> >> .code32 >> >> // Acquire lock and take ownership of shared stack >> >> 1: rep ; nop >> > -- >> > Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK > -- > Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
