On 01/12/2017 18:45, Gonglei (Arei) wrote: > I also think it's windows bug, the problem is that it doesn't occur on > xen platform.
It's a race, it may just be that RTC PIO is faster in Xen because it's implemented in the hypervisor. I will try reporting it to Microsoft. Thanks, Paolo > Thanks, > Gonglei > *发件人：*Paolo Bonzini > *收件人：*龚磊,张海亮,qemu-devel,Michael S. Tsirkin > *抄送：*黄伟栋,王欣,谢祥有 > *时间：*2017-12-02 01:10:08 > *主题:*Re: [BUG] Windows 7 got stuck easily while run PCMark10 application > > On 01/12/2017 08:08, Gonglei (Arei) wrote: >> First write to 0x70, cmos_index = 0xc & 0x7f = 0xc >> CPU 0/KVM-15566 kvm_pio: pio_write at 0x70 size 1 count 1 val 0xc> >> Second write to 0x70, cmos_index = 0x86 & 0x7f = 0x6> CPU 1/KVM-15567 >> kvm_pio: pio_write at 0x70 size 1 count 1 val 0x86> vcpu0 read 0x6 because >> cmos_index is 0x6 now:> CPU 0/KVM-15566 kvm_pio: pio_read at 0x71 >> size 1 count 1 val 0x6> vcpu1 > read 0x6:> CPU 1/KVM-15567 kvm_pio: pio_read at 0x71 size 1 count > 1 val 0x6 > This seems to be a Windows bug. The easiest workaround that I > can think of is to clear the interrupts already when 0xc is written, > without waiting for the read (because REG_C can only be read). > > What do you think? > > Thanks, > > Paolo
