blob: db300b21dd5b9466a41abd1711578b9f88f89b6e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
From 2ece92e70fbd29fd14c1add63648b7154521b473 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Fri, 9 Feb 2018 14:01:33 +0100
Subject: [PATCH 85/93] KVM: lapic: stop advertising DIRECTED_EOI when
in-kernel IOAPIC is in use
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
[ 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>
---
arch/x86/kvm/lapic.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 650ff4a..d99e13d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -294,8 +294,16 @@ void kvm_apic_set_version(struct kvm_vcpu *vcpu)
if (!lapic_in_kernel(vcpu))
return;
+ /*
+ * KVM emulates 82093AA datasheet (with in-kernel IOAPIC implementation)
+ * which doesn't have EOI register; Some buggy OSes (e.g. Windows with
+ * Hyper-V role) disable EOI broadcast in lapic not checking for IOAPIC
+ * version first and level-triggered interrupts never get EOIed in
+ * IOAPIC.
+ */
feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
- if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
+ if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))) &&
+ !ioapic_in_kernel(vcpu->kvm))
v |= APIC_LVR_DIRECTED_EOI;
kvm_lapic_set_reg(apic, APIC_LVR, v);
}
--
2.7.4
|
