Re: [Xen-devel] [BUG] x86/hvm/vioapic: 8-Bit IOREGSEL write does not work

2017-09-06 Thread Jan Beulich
>>> On 06.09.17 at 11:58, wrote: > On 05/09/17 19:26, Christian Prochaska wrote: >> I've seen this problem with Xen 4.6.5 from the Xubuntu 16.04 >> distribution and from a quick look over the current vioapic code it >> seems to be still present. >> >> From the IOAPIC datasheet [1]: "To reference a

Re: [Xen-devel] [BUG] x86/hvm/vioapic: 8-Bit IOREGSEL write does not work

2017-09-06 Thread Andrew Cooper
On 05/09/17 19:26, Christian Prochaska wrote: > I've seen this problem with Xen 4.6.5 from the Xubuntu 16.04 > distribution and from a quick look over the current vioapic code it > seems to be still present. > > From the IOAPIC datasheet [1]: "To reference an IOAPIC register, a byte > memory write

Re: [Xen-devel] [BUG] x86/hvm/vioapic: 8-Bit IOREGSEL write does not work

2017-09-06 Thread Roger Pau Monné
On Tue, Sep 05, 2017 at 08:26:20PM +0200, Christian Prochaska wrote: > I've seen this problem with Xen 4.6.5 from the Xubuntu 16.04 > distribution and from a quick look over the current vioapic code it > seems to be still present. > > From the IOAPIC datasheet [1]: "To reference an IOAPIC register

[Xen-devel] [BUG] x86/hvm/vioapic: 8-Bit IOREGSEL write does not work

2017-09-05 Thread Christian Prochaska
I've seen this problem with Xen 4.6.5 from the Xubuntu 16.04 distribution and from a quick look over the current vioapic code it seems to be still present. From the IOAPIC datasheet [1]: "To reference an IOAPIC register, a byte memory write that the PIIX3 decodes for the IOAPIC loads the IOREGSEL