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[Qemu-devel] [PULL v6 38/42] docs: Deprecate CPU model runnability guara
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [PULL v6 38/42] docs: Deprecate CPU model runnability guarantees |
Date: |
Fri, 5 Jul 2019 19:15:00 -0300 |
Document that CPU model runnability guarantees won't apply to
unversioned CPU models anymore.
Signed-off-by: Eduardo Habkost <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>
---
qemu-deprecated.texi | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index e6891c3a93..c90b08d553 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -292,3 +292,22 @@ subset of the image.
In the future, QEMU will require Python 3 to be available at
build time. Support for Python 2 in scripts shipped with QEMU
is deprecated.
+
+@section Backwards compatibility
+
+@subsection Runnability guarantee of CPU models (since 4.1.0)
+
+Previous versions of QEMU never changed existing CPU models in
+ways that introduced additional host software or hardware
+requirements to the VM. This allowed management software to
+safely change the machine type of an existing VM without
+introducing new requirements ("runnability guarantee"). This
+prevented CPU models from being updated to include CPU
+vulnerability mitigations, leaving guests vulnerable in the
+default configuration.
+
+The CPU model runnability guarantee won't apply anymore to
+existing CPU models. Management software that needs runnability
+guarantees must resolve the CPU model aliases using te
+``alias-of'' field returned by the ``query-cpu-definitions'' QMP
+command.
--
2.18.0.rc1.1.g3f1ff2140
- [Qemu-devel] [PULL v6 29/42] qmp: Add deprecation information to query-machines, (continued)
- [Qemu-devel] [PULL v6 29/42] qmp: Add deprecation information to query-machines, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 30/42] i386: Introduce SnowRidge CPU model, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 31/42] qmp: Add "alias-of" field to query-cpu-definitions, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 34/42] i386: Register versioned CPU models, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 42/42] tests: use -numa memdev option in tests instead of legacy 'mem' option, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 32/42] i386: Add x-force-features option for testing, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 33/42] i386: Get model-id from CPU object on "-cpu help", Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 39/42] i386: Add Cascadelake-Server-v2 CPU model, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 40/42] numa: Make deprecation warnings conditional on !qtest_enabled(), Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 38/42] docs: Deprecate CPU model runnability guarantees,
Eduardo Habkost <=
- [Qemu-devel] [PULL v6 36/42] i386: Replace -noTSX, -IBRS, -IBPB CPU models with aliases, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 35/42] i386: Define -IBRS, -noTSX, -IBRS versions of CPU models, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 41/42] numa: allow memory-less nodes when using memdev as backend, Eduardo Habkost, 2019/07/05
- [Qemu-devel] [PULL v6 37/42] i386: Make unversioned CPU models be aliases, Eduardo Habkost, 2019/07/05
- Re: [Qemu-devel] [PULL v6 00/42] Machine and x86 queue, 2019-07-05, no-reply, 2019/07/06
- Re: [Qemu-devel] [PULL v6 00/42] Machine and x86 queue, 2019-07-05, Peter Maydell, 2019/07/08