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[PATCH v8 2/9] i386: clarify 'hv-passthrough' behavior
From: |
Vitaly Kuznetsov |
Subject: |
[PATCH v8 2/9] i386: clarify 'hv-passthrough' behavior |
Date: |
Tue, 8 Jun 2021 14:08:10 +0200 |
Clarify the fact that 'hv-passthrough' only enables features which are
already known to QEMU and that it overrides all other 'hv-*' settings.
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
docs/hyperv.txt | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/docs/hyperv.txt b/docs/hyperv.txt
index e53c581f4586..a51953daa833 100644
--- a/docs/hyperv.txt
+++ b/docs/hyperv.txt
@@ -209,8 +209,11 @@ In some cases (e.g. during development) it may make sense
to use QEMU in
'pass-through' mode and give Windows guests all enlightenments currently
supported by KVM. This pass-through mode is enabled by "hv-passthrough" CPU
flag.
-Note: enabling this flag effectively prevents migration as supported features
-may differ between target and destination.
+Note: "hv-passthrough" flag only enables enlightenments which are known to QEMU
+(have corresponding "hv-*" flag) and copies "hv-spinlocks="/"hv-vendor-id="
+values from KVM to QEMU. "hv-passthrough" overrides all other "hv-*" settings
on
+the command line. Also, enabling this flag effectively prevents migration as
the
+list of enabled enlightenments may differ between target and destination hosts.
4. Useful links
--
2.31.1
- [PATCH v8 0/9] i386: KVM: expand Hyper-V features early, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 1/9] i386: avoid hardcoding '12' as 'hyperv_vendor_id' length, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 2/9] i386: clarify 'hv-passthrough' behavior,
Vitaly Kuznetsov <=
- [PATCH v8 3/9] i386: hardcode supported eVMCS version to '1', Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 4/9] i386: make hyperv_expand_features() return bool, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 5/9] i386: expand Hyper-V features during CPU feature expansion time, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 6/9] i386: kill off hv_cpuid_check_and_set(), Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 7/9] i386: HV_HYPERCALL_AVAILABLE privilege bit is always needed, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 8/9] i386: Hyper-V SynIC requires POST_MESSAGES/SIGNAL_EVENTS privileges, Vitaly Kuznetsov, 2021/06/08
- [PATCH v8 9/9] qtest/hyperv: Introduce a simple hyper-v test, Vitaly Kuznetsov, 2021/06/08