This patch addes a Bulldozer-based Opteron_G4 CPU model.
This version has the ffxsr bit actually disabled, to match what was
documented below. Thanks to Andre Przywara for spotting the bug.
I am trying to be conservative with the new model, so I am enabling only
features known to be useful to guests, and not enabling anything that
was not tested or found to be useful to a guest.
List of missing flags in comparison to real hardware:
- vme: host-specific feature.
- osxsave: it is not set here because it is set by the guest OS, not by KVM
- monitor: this is filtered out by the KVM module, so no point in
enabling it.
- mmxext: untested, so not enabled.
- Perf*, Topology*, lwp, ibs: not emulated by KVM.
- wdt, skinit, osvw, altmovcr8, extapicspace, cmplegacy: untested,
so not enabled.
List of new flags, in comparison to the Opteron_G3 model:
- xsave: xsave feature, already implemented by Qemu
- avx, aes, sse4.x, ssse3, pclmulqdq: all new state the new instructions
could use is handled by the xsave state loading/saving code on Qemu.
- pdpe1gb: 1GB pages, supported by the KVM kernel module.
- ffxsr: untested, so not enabled
- fma4, xop: all new state the new instructions could use is handled by
the xsave loading/saving code on Qemu.
- 3dnowprefetch: safe to pass through, though the flag is not used by
Linux guests, at least.
Below is the comparison between the current Opteron_G3 model
and the new model being added.
- The "full" line contains the flags found on actual hardware.
- The "missing" line shows the flags that are present on actual
hardware, but not on the added Opteron_G4 model.
- The "new" line shows the flags that were not on the Opteron_G3 model
but are on Opteron_G4.
feature_edx:
Opteron_G3: sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu
full: sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu
Opteron_G4: sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu
missing: vme
feature_ecx:
Opteron_G3: popcnt cx16 monitor sse3
full: avx osxsave xsave aes popcnt sse4.2 sse4.1 cx16 ssse3 monitor pclmulqdq sse3
Opteron_G4: avx xsave aes popcnt sse4.2 sse4.1 cx16 ssse3 pclmulqdq sse3
missing: osxsave monitor
new: avx xsave aes sse4.2 sse4.1 ssse3 pclmulqdq
extfeature_edx:
Opteron_G3: lm rdtscp fxsr mmx nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu
full: lm rdtscp pdpe1gb ffxsr fxsr mmx mmxext nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de vme fpu
Opteron_G4: lm rdtscp pdpe1gb fxsr mmx nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu
missing: mmxext vme
new: pdpe1gb
extfeature_ecx:
Opteron_G3: misalignsse sse4a abm svm lahf_lm
full: Perf* Topology* fma4 lwp wdt skinit xop ibs osvw 3dnowprefetch misalignsse sse4a abm altmovcr8 extapicspace svm cmplegacy lahf_lm
Opteron_G4: fma4 xop 3dnowprefetch misalignsse sse4a abm svm lahf_lm
new: fma4 xop 3dnowprefetch
missing: Perf* Topology* lwp wdt skinit ibs osvw altmovcr8 extapicspace cmplegacy
Changes v1 -> v2:
- Actually disable ffxsr bit
Cc: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
885bb0369a