Il 26/08/2014 18:27, Wei Wang ha scritto:
> kvm_ioapic_scan_entry() needs to update tmr. The previous lapic tmr value
> (old_tmr) needs to sync with ioapic to get an accurate updated tmr
> value before the updating work.
> + u32 irr[8];
> + u32 isr[8];
> + u32 old_tmr[8];
These do not need to be arrays. You can use a single variable for each
of irr, isr and old_tmr.
> int i;
>
> - for (i = 0; i < 8; i++)
> + for (i = 0; i < 8; i++) {
> + irr[i] = kvm_apic_get_reg(apic, APIC_IRR + 0x10 * i);
> + isr[i] = kvm_apic_get_reg(apic, APIC_ISR + 0x10 * i);
> + old_tmr[i] = kvm_apic_get_reg(apic, APIC_TMR + 0x10 * i);
> + tmr[i] = (~(irr[i] | isr[i]) & tmr[i])
> + | ((irr[i] | isr[i]) & old_tmr[i]);
Please do not modify the tmr array. Instead, use kvm_apic_get_reg in
the next patch to read the TMR.
Also, please add a comment about how the code works and why the old TMR
is used if IRR=1 || ISR=1.
Paolo
> apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
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