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[Qemu-devel] [PULL 4/5] docs: clarify that spec-ctrl is only needed for
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [PULL 4/5] docs: clarify that spec-ctrl is only needed for Spectre v2 |
Date: |
Thu, 21 Mar 2019 16:35:59 -0300 |
From: Daniel P. Berrangé <address@hidden>
The docs currently say that the spec-ctrl feature is needed for both
Spectre variants, but it is only used to address Spectre v2. Also
remove the note about retpolines. The guest OS is usually treated
as a blackbox from host mgmt pov, so it won't have knowledge about
use of retpolines and thus should unconditionally expose spec-ctrl,
allowing the guest to decide whether to use it or not.
Signed-off-by: Daniel P. Berrangé <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>
---
docs/qemu-cpu-models.texi | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/docs/qemu-cpu-models.texi b/docs/qemu-cpu-models.texi
index 1b72584161..0ce528806d 100644
--- a/docs/qemu-cpu-models.texi
+++ b/docs/qemu-cpu-models.texi
@@ -158,8 +158,7 @@ support this feature.
@item @code{spec-ctrl}
-Required to enable the Spectre (CVE-2017-5753 and CVE-2017-5715) fix,
-in cases where retpolines are not sufficient.
+Required to enable the Spectre v2 (CVE-2017-5715) fix.
Included by default in Intel CPU models with -IBRS suffix.
@@ -249,8 +248,7 @@ included if using "Host passthrough" or "Host model".
@item @code{ibpb}
-Required to enable the Spectre (CVE-2017-5753 and CVE-2017-5715) fix,
-in cases where retpolines are not sufficient.
+Required to enable the Spectre v2 (CVE-2017-5715) fix.
Included by default in AMD CPU models with -IBPB suffix.
--
2.18.0.rc1.1.g3f1ff2140
- [Qemu-devel] [PULL 0/5] x86 queue for -rc1, Eduardo Habkost, 2019/03/21
- [Qemu-devel] [PULL 1/5] i386: kvm: Disable arch_capabilities if MSR can't be set, Eduardo Habkost, 2019/03/21
- [Qemu-devel] [PULL 2/5] i386: Make arch_capabilities migratable, Eduardo Habkost, 2019/03/21
- [Qemu-devel] [PULL 3/5] i386: Disable OSPKE on CPU model definitions, Eduardo Habkost, 2019/03/21
- [Qemu-devel] [PULL 4/5] docs: clarify that spec-ctrl is only needed for Spectre v2,
Eduardo Habkost <=
- [Qemu-devel] [PULL 5/5] docs: add note about stibp CPU feature for spectre v2, Eduardo Habkost, 2019/03/21
- Re: [Qemu-devel] [PULL 0/5] x86 queue for -rc1, Peter Maydell, 2019/03/22