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| author | Borislav Petkov <bp@suse.de> | 2018-12-20 10:07:32 -0200 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2019-01-14 12:23:36 -0200 |
| commit | 483c6ad426dbab72d912fe4793d7d558671aa727 (patch) | |
| tree | 932027487408540e19337e2902b37d99fbd9e518 /qemu-doc.texi | |
| parent | a2b107dbbd342ff2077aa5af705efaf68c375459 (diff) | |
| download | qemu-483c6ad426dbab72d912fe4793d7d558671aa727.zip qemu-483c6ad426dbab72d912fe4793d7d558671aa727.tar.gz qemu-483c6ad426dbab72d912fe4793d7d558671aa727.tar.bz2 | |
target-i386: Reenable RDTSCP support on Opteron_G[345] CPU models CPU models
The missing functionality was added ~3 years ago with the Linux commit
46896c73c1a4 ("KVM: svm: add support for RDTSCP")
so reenable RDTSCP support on those CPU models.
Opteron_G2 - being family 15, model 6, doesn't have RDTSCP support
(the real hardware doesn't have it. K8 got RDTSCP support with the NPT
models, i.e., models >= 0x40).
Document the host's minimum required kernel version, while at it.
Signed-off-by: Borislav Petkov <bp@suse.de>
Message-ID: <20181212200803.GG6653@zn.tnic>
[ehabkost: moved compat properties code to pc.c]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'qemu-doc.texi')
| -rw-r--r-- | qemu-doc.texi | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi index f7ad1df..16b955c 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -37,6 +37,7 @@ * QEMU System emulator for non PC targets:: * QEMU Guest Agent:: * QEMU User space emulator:: +* System requirements:: * Implementation notes:: * Deprecated features:: * Supported build platforms:: @@ -2813,6 +2814,18 @@ Act as if the host page size was 'pagesize' bytes Run the emulation in single step mode. @end table +@node System requirements +@chapter System requirements + +@section KVM kernel module + +On x86_64 hosts, the default set of CPU features enabled by the KVM accelerator +require the host to be running Linux v4.5 or newer. + +The OpteronG[345] CPU models require KVM support for RDTSCP, which was +added with Linux 4.5 which is supported by the major distros. And even +if RHEL7 has kernel 3.10, KVM there has the required functionality there +to make it close to a 4.5 or newer kernel. @include qemu-tech.texi |