6b0e33be88
9 Commits
| Author | SHA1 | Message | Date | |
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Eduardo Habkost
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885bb0369a |
add Opteron_G4 CPU model (v2)
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> |
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Eduardo Habkost
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c34ea31416 |
add SandyBridge CPU model
This patches add the definition of a SandyBridge CPU model. Summary of differences: Flags present on actual hardware, but not on the added model definition: - pbe, tm, ht, ss, acpi, vme, xTPR, tm2, eist, smx: host-specific features, not exposed to guest. - ds, ds-cpl, dtes64, pdcm: emulation not supported by KVM (although it may be added in the future if implementing PMU virtualization) - pcid, vmx, monitor: not emulated by Qemu/KVM right now. - osxsave: set by the guest OS, not by Qemu. Flags added, that were not present on Westmere model: - xsave: already supported by Qemu - avx, pclmulqdq: all new state the new instructions could use is handled by xsave state loading/saving code. - tsc-deadline, x2apic, rdtscp: already supported by Qemu/KVM. Below there's a comparison of the features on the current Westmere CPU model, and the SandyBridge CPU model. - 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 SandyBridge model. - The "new" line shows the flags that were not on the Westmere model, but are on SandyBridge. feature_edx: Westmere: sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu full: pbe tm ht ss sse2 sse fxsr mmx ds acpi clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pge msr tsc pse de vme fpu SandyBridge: sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu missing: pbe tm ht ss ds acpi vme feature_ecx: Westmere: aes popcnt sse4.2 sse4.1 cx16 ssse3 sse3 full: avx osxsave xsave aes tsc-deadline popcnt x2apic sse4.2 sse4.1 pcid pdcm xTPR cx16 ssse3 tm2 eist smx vmx ds-cpl monitor dtes64 pclmulqdq sse3 SandyBridge: avx xsave aes tsc-deadline popcnt x2apic sse4.2 sse4.1 cx16 ssse3 pclmulqdq sse3 missing: osxsave pcid pdcm xTPR tm2 eist smx vmx ds-cpl monitor dtes64 new: avx xsave tsc-deadline x2apic pclmulqdq extfeature_edx: Westmere: i64 nx syscall full: i64 rdtscp nx syscall SandyBridge: i64 rdtscp nx syscall new: rdtscp extfeature_ecx: Westmere: lahf_lm full: lahf_lm SandyBridge: lahf_lm Cc: "Dugger, Donald D" <donald.d.dugger@intel.com> Cc: "Zhang, Xiantao" <xiantao.zhang@intel.com> Acked-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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adbbdf2484 |
cpu defs: uncomment empty extfeatures_ecx definition for Opteron_G1 (v2)
This should have no visible effect, but it should just clean up the config file a bit. This is based on a previous patch from John Cooper where this was introduced with many other changes at the same time. Original John's patch submission is at Message-ID: <4DDAD5E7.2020002@redhat.com>, <http://marc.info/?l=qemu-devel&m=130618871926030>. Changes v1 -> v2: - Rebase against latest Qemu git tree Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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c58a6694f1 |
add Westmere as a qemu cpu model (v2)
Version 1 of this patch was: Message-Id: <1307041990-26194-11-git-send-email-ehabkost@redhat.com http://marc.info/?l=qemu-devel&m=130704415919346 This version doesn't have the duplicate feature bits on extfeature_edx, though, as they are being removed from the Intel models (as they are reserved bits on Intel CPUs). Version 1 patch description: This patch adds Westmere as a qemu cpu model. The only additional guest visible feature of a Westmere relative to Nehalem is the inclusion of AES instructions. However as other non-ABI visible modifications exist along with fabrication changes, the CPUID data of the corresponding deployed silicon was altered slightly to reflect this. We've seen isolated cases where apparently unrelated yet slightly incoherent CPUID data has caused problems, most notably during guest boot. Providing Westmere as a model separate fro Nehalem allows us to more easily address such quirks. [ehabkost: edited commit message to have a better Subject line] Signed-off-by: john cooper <john.cooper@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Changes version 1 -> version 2: - Remove the duplicate feature bits on extfeature_edx, that are reserved on Intel CPUs - Reorder feature flags - Remove x2apic from the definition because x2apic requires some fixes that have to be resubmitted Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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df07ec5626 |
cpu defs: remove replicated flags from Intel (v2)
This patch removes the replicated feature flags from cpuid 8000_0001:edx (extfeature_edx) from Intel models, as the duplicated feature flags are present only on AMD CPUs. On Intel models, only the i64, syscall, and xd flags are kept on extfeature_edx. This is based on a previous patch from John Cooper where this was introduced with many other changes at the same time. Original John's patch submission is at Message-ID: <4DDAD5E7.2020002@redhat.com>, <http://marc.info/?l=qemu-devel&m=130618871926030>. Original John's patch description was: cpu model bug fixes and definition corrections This patch was intended to address the replicated feature flags in cpuid 8000_0001:edx from cpuid 0000_0001:edx. This is due to AMD's definition where these flags are mostly cloned in the 8000_0001:edx cpuid function. qemu64 attempted to glue together the respective Intel and AMD nearly disjoint features and this propagated to the new Intel models as doing so was believed conservative at the time. However after further soak and test lugging around this cruft doesn't provide any value, could conceivably confuse a guest, and has confused users trying to maintain/add cpu definitions. This also caused issues for libvirt attempting to track this mis-encoding. So we've here tossed out the AMD replicated definitions from the Intel models, added a few replications into AMD definitions which were missing according to AMD's latest CPUID document, and reordered the config file flags to follow intuitive sequential bit ordering. Also two flag name aliases were added for clarity to Intel models. The end result being the models definitions now conform to their respective cpuid specifications sans x2apic which is emulated by kvm. This was tested with the following combinations: [Conroe, Penryn, Nehalem] x [F12-64, win64, win32] -- Intel host [Opteron_G1, Opteron_G2, Opteron_G3] x [F12-64, win64, win32] -- AMD host Yielding successful boots in all cases. Signed-off-by: john cooper <john.cooper@redhat.com> Changes v1 -> v2: - Rebase against latest Qemu git tree Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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0ce01375a2 |
cpu defs: add pse36, mca, mtrr to AMD CPU definitions (v2)
This patch adds some missing flags to extfeature_edx, that were missing according to AMD's latest CPUID document. This is based on a previous patch from John Cooper where this was introduced with many other changes at the same time. Original John's patch submission is at Message-ID: <4DDAD5E7.2020002@redhat.com>, <http://marc.info/?l=qemu-devel&m=130618871926030>. Original John's patch description was: cpu model bug fixes and definition corrections This patch was intended to address the replicated feature flags in cpuid 8000_0001:edx from cpuid 0000_0001:edx. This is due to AMD's definition where these flags are mostly cloned in the 8000_0001:edx cpuid function. qemu64 attempted to glue together the respective Intel and AMD nearly disjoint features and this propagated to the new Intel models as doing so was believed conservative at the time. However after further soak and test lugging around this cruft doesn't provide any value, could conceivably confuse a guest, and has confused users trying to maintain/add cpu definitions. This also caused issues for libvirt attempting to track this mis-encoding. So we've here tossed out the AMD replicated definitions from the Intel models, added a few replications into AMD definitions which were missing according to AMD's latest CPUID document, and reordered the config file flags to follow intuitive sequential bit ordering. Also two flag name aliases were added for clarity to Intel models. The end result being the models definitions now conform to their respective cpuid specifications sans x2apic which is emulated by kvm. This was tested with the following combinations: [Conroe, Penryn, Nehalem] x [F12-64, win64, win32] -- Intel host [Opteron_G1, Opteron_G2, Opteron_G3] x [F12-64, win64, win32] -- AMD host Yielding successful boots in all cases. Signed-off-by: john cooper <john.cooper@redhat.com> Changes v1 -> v2: - Rebase against latest Qemu git tree Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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3ac8ebfe1c |
cpu defs: use Intel flag names for Intel models (v2)
Use 'i64' instead of 'lm' and 'xd' instead of 'nx' on Intel models. The flags have different names on Intel docs, so use those names for clarity. This is based on a previous patch from John Cooper where this was introduced with many other changes at the same time. Original John's patch submission is at Message-ID: <4DDAD5E7.2020002@redhat.com>, <http://marc.info/?l=qemu-devel&m=130618871926030>. Changes v1 -> v2: - Rebase patch against latest Qemu git tree Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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Eduardo Habkost
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f5244e937a |
cpu models: reorder flag list to match bit order
This will make it easier to review and change the flag list in the future. No behaviour change should be introduced by this, as it is just changing the flag order on the config file. To make sure the flag sets are really not changed by this patch, I have used the following stupid script to compare the flag values in the config files: https://gist.github.com/1004885 Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> |
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john cooper
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b5ec5ce0e3 |
Add cpu model configuration support..
This is a reimplementation of prior versions which adds
the ability to define cpu models for contemporary processors.
The added models are likewise selected via -cpu <name>,
and are intended to displace the existing convention
of "-cpu qemu64" augmented with a series of feature flags.
A primary motivation was determination of a least common
denominator within a given processor class to simplify guest
migration. It is still possible to modify an arbitrary model
via additional feature flags however the goal here was to
make doing so unnecessary in typical usage. The other
consideration was providing models names reflective of
current processors. Both AMD and Intel have reviewed the
models in terms of balancing generality of migration vs.
excessive feature downgrade relative to released silicon.
This version of the patch replaces the prior hard wired
definitions with a configuration file approach for new
models. Existing models are thus far left as-is but may
easily be transitioned to (or may be overridden by) the
configuration file representation.
Proposed new model definitions are provided here for current
AMD and Intel processors. Each model consists of a name
used to select it on the command line (-cpu <name>), and a
model_id which corresponds to a least common denominator
commercial instance of the processor class.
A table of names/model_ids may be queried via "-cpu ?model":
:
x86 Opteron_G3 AMD Opteron 23xx (Gen 3 Class Opteron)
x86 Opteron_G2 AMD Opteron 22xx (Gen 2 Class Opteron)
x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron)
x86 Nehalem Intel Core i7 9xx (Nehalem Class Core i7)
x86 Penryn Intel Core 2 Duo P9xxx (Penryn Class Core 2)
x86 Conroe Intel Celeron_4x0 (Conroe/Merom Class Core 2)
:
Also added is "-cpu ?dump" which exhaustively outputs all config
data for all defined models, and "-cpu ?cpuid" which enumerates
all qemu recognized CPUID feature flags.
The pseudo cpuid flag 'check' when added to the feature flag list
will warn when feature flags (either implicit in a cpu model or
explicit on the command line) would have otherwise been quietly
unavailable to a guest:
# qemu-system-x86_64 ... -cpu Nehalem,check
warning: host cpuid 0000_0001 lacks requested flag 'sse4.2|sse4_2' [0x00100000]
warning: host cpuid 0000_0001 lacks requested flag 'popcnt' [0x00800000]
A similar 'enforce' pseudo flag exists which in addition
to the above causes qemu to error exit if requested flags are
unavailable.
Configuration data for a cpu model resides in the target config
file which by default will be installed as:
/usr/local/etc/qemu/target-<arch>.conf
The format of this file should be self explanatory given the
definitions for the above six models and essentially mimics
the structure of the static x86_def_t x86_defs.
Encoding of cpuid flags names now allows aliases for both the
configuration file and the command line which reconciles some
Intel/AMD/Linux/Qemu naming differences.
This patch was tested relative to qemu.git.
Signed-off-by: john cooper <john.cooper@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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