[Xen-devel] Why did Changeset 12028 remove the handling of ESR?

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Hi Keir,
I found you did some clean-up in Changeset 12028.
I noticed you removed the handling of ESR(Error status register). This includes:
1) remove the handling of reading/writing APIC_ESR;
2) removing vlapic_check_vector(); when writing the entries in Local APIC's 
LVT, no calling vlapic_check_vector();
3) In cpu_get_apic_interrupt(), no checking whether the want-to-deliver vector 
number < 0x10;
Could you explain the reason?
When installing x64 windows, we found without the handling of ESR, the 
installation process would hang.
I think we might as well restore the handling of ESR?

Thanks!
 -- Dexuan

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