> Not all PIO operations are DMA. Provide a trace and we can look.
Hi,
here's snippet:
qemu-kvm-16441 [000] 12887154.698329: kvm_pio: pio_read at 0xc002 size 1 count 1
qemu-kvm-16441 [000] 12887154.698331: kvm_userspace_exit: reason KVM_EXIT_IO (2)
qemu-kvm-16441 [000] 12887154.698331: kvm_fpu: unload
qemu-kvm-16441 [000] 12887154.698337: kvm_entry: vcpu 1
qemu-kvm-16441 [000] 12887154.698338: kvm_exit: [FAILED TO PARSE] exit_reason=30 guest_rip=0xfffff88000dabca3 isa=1 info1=3221356552 info2=0
qemu-kvm-16441 [000] 12887154.698339: kvm_emulate_insn: [FAILED TO PARSE] rip=18446735827386678435 csbase=0 len=1 insn=<EC><C3><CC><CC><CC><CC><CC><CC><CC>^O<B7><D1>f<ED><C3> flags=9 failed=0
qemu-kvm-16441 [000] 12887154.698340: kvm_pio: pio_read at 0xc002 size 1 count 1
qemu-kvm-16441 [000] 12887154.698340: kvm_userspace_exit: reason KVM_EXIT_IO (2)
qemu-kvm-16441 [000] 12887154.698343: kvm_entry: vcpu 1
qemu-kvm-16441 [000] 12887154.698344: kvm_exit: [FAILED TO PARSE] exit_reason=30 guest_rip=0xfffff88000dabdbd isa=1 info1=3221225472 info2=0
qemu-kvm-16441 [000] 12887154.698345: kvm_pio: pio_write at 0xc000 size 1 count 1
qemu-kvm-16441 [000] 12887154.698346: kvm_userspace_exit: reason KVM_EXIT_IO (2)
qemu-kvm-16441 [000] 12887154.698348: kvm_entry: vcpu 1
qemu-kvm-16441 [000] 12887154.698349: kvm_exit: [FAILED TO PARSE] exit_reason=30 guest_rip=0xfffff88000dabdbd isa=1 info1=3221356544 info2=0
qemu-kvm-16441 [000] 12887154.698349: kvm_pio: pio_write at 0xc002 size 1 count 1
qemu-kvm-16441 [000] 12887154.698350: kvm_userspace_exit: reason KVM_EXIT_IO (2)
qemu-kvm-16441 [000] 12887154.698352: kvm_entry: vcpu 1
qemu-kvm-16441 [000] 12887154.698353: kvm_exit: [FAILED TO PARSE] exit_reason=30 guest_rip=0xfffff88000dabca3 isa=1 info1=32964616 info2=0
qemu-kvm-16441 [000] 12887154.698354: kvm_emulate_insn: [FAILED TO PARSE] rip=18446735827386678435 csbase=0 len=1 insn=<EC><C3><CC><CC><CC><CC><CC><CC><CC>^O<B7><D1>f<ED><C3> flags=9 failed=0
qemu-kvm-16441 [000] 12887154.698354: kvm_pio: pio_read at 0x1f7 size 1 count 1
qemu-kvm-16441 [000] 12887154.698355: kvm_userspace_exit: reason KVM_EXIT_IO (2)
qemu-kvm-16441 [000] 12887154.698357: kvm_set_irq: gsi 14 level 0 source 0
qemu-kvm-16441 [000] 12887154.698358: kvm_pic_set_irq: chip 1 pin 6 (edge|masked)
qemu-kvm-16441 [000] 12887154.698358: kvm_ioapic_set_irq: pin 14 dst 3 vec=97 (LowPrio|logical|edge)
qemu-kvm-16441 [000] 12887154.698360: kvm_entry: vcpu 1
qemu-kvm-16441 [000] 12887154.698362: kvm_exit: [FAILED TO PARSE] exit_reason=30 guest_rip=0xfffff88000dabca3 isa=1 info1=32964616 info2=0
qemu-kvm-16441 [000] 12887154.698363: kvm_emulate_insn: [FAILED TO PARSE] rip=18446735827386678435 csbase=0 len=1 insn=<EC><C3><CC><CC><CC><CC><CC><CC><CC>^O<B7><D1>f<ED><C3> flags=9 failed=0
qemu-kvm-16441 [000] 12887154.698363: kvm_pio: pio_read at 0x1f7 size 1 count 1
n.
>
> --
> error compiling committee.c: too many arguments to function
>
--
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