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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-02-09 16:01:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 08:52:31 +0300 |
| commit | 25b69a422b592edd2739fab9150f5d29955043f7 (patch) | |
| tree | 00bb48180e474f9f22903efc2de28d683453ebfb /tools | |
| parent | 982f8f14e704ad07e4093e208723157312620b27 (diff) | |
| download | linux-25b69a422b592edd2739fab9150f5d29955043f7.tar.xz | |
KVM: lapic: stop advertising DIRECTED_EOI when in-kernel IOAPIC is in use
[ Upstream commit 0bcc3fb95b97ac2ca223a5a870287b37f56265ac ]
Devices which use level-triggered interrupts under Windows 2016 with
Hyper-V role enabled don't work: Windows disables EOI broadcast in SPIV
unconditionally. Our in-kernel IOAPIC implementation emulates an old IOAPIC
version which has no EOI register so EOI never happens.
The issue was discovered and discussed a while ago:
https://www.spinics.net/lists/kvm/msg148098.html
While this is a guest OS bug (it should check that IOAPIC has the required
capabilities before disabling EOI broadcast) we can workaround it in KVM:
advertising DIRECTED_EOI with in-kernel IOAPIC makes little sense anyway.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions