The -cpu check/enforce warnings are printing incorrect information about the
missing flags. There are no feature flags on CPUID leaves 0 and 0x80000000, but
there were references to 0 and 0x80000000 in the table at
kvm_check_features_against_host().
This changes the model_features_t struct to contain the register number as
well, so the error messages print the correct CPUID leaf+register information,
instead of wrong CPUID leaf numbers.
This also changes the format of the error messages, so they follow the
"CPUID.<leaf>.<register>.<name> [bit <offset>]" convention used in Intel
documentation. Example output:
$ qemu-system-x86_64 -machine pc-1.0,accel=kvm -cpu Opteron_G4,+ia64,enforce
warning: host doesn't support requested feature: CPUID.01H:EDX.ia64 [bit 30]
warning: host doesn't support requested feature: CPUID.01H:ECX.xsave [bit 26]
warning: host doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.abm [bit 5]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.sse4a [bit 6]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.misalignsse [bit 7]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.3dnowprefetch [bit 8]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.xop [bit 11]
warning: host doesn't support requested feature: CPUID.80000001H:ECX.fma4 [bit 16]
Unable to find x86 CPU definition
$
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
When using -cpu host, we don't need to use the kvm_default_features
variable, as the user is explicitly asking QEMU to enable all feature
supported by the host.
This changes the kvm_cpu_fill_host() code to use GET_SUPPORTED_CPUID to
initialize the kvm_features field, so we get all host KVM features
enabled.
This will also allow us to properly check/enforce KVM features inside
kvm_check_features_against_host() later. For example, we will be able to
make this:
$ qemu-system-x86_64 -cpu ...,+kvm_pv_eoi,enforce
refuse to start if kvm_pv_eoi is not supported by the host (after we fix
kvm_check_features_against_host() to check KVM flags as well).
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
The existing -cpu host code simply sets every bit inside svm_features
(initializing it to -1), and that makes it impossible to make the
enforce/check options work properly when the user asks for SVM features
explicitly in the command-line.
So, instead of initializing svm_features to -1, use GET_SUPPORTED_CPUID
to fill only the bits that are supported by the host (just like we do
for all other CPUID feature words inside kvm_cpu_fill_host()).
This will keep the existing behavior (as filter_features_for_kvm()
already uses GET_SUPPORTED_CPUID to filter svm_features), but will allow
us to properly check for KVM features inside
kvm_check_features_against_host() later.
For example, we will be able to make this:
$ qemu-system-x86_64 -cpu ...,+pfthreshold,enforce
refuse to start if the SVM "pfthreshold" feature is not supported by the
host (after we fix kvm_check_features_against_host() to check SVM flags
as well).
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
* 'qom-cpu' of git://repo.or.cz/qemu/afaerber:
MAINTAINERS: Include X86CPU in CPU maintenance area
cpu: Move kvm_run into CPUState
cpu: Move kvm_state field into CPUState
ppc_booke: Pass PowerPCCPU to ppc_booke_timers_init()
ppc4xx_devs: Return PowerPCCPU from ppc4xx_init()
ppc_booke: Pass PowerPCCPU to {decr,fit,wdt} timer callbacks
ppc: Pass PowerPCCPU to [h]decr timer callbacks
ppc: Pass PowerPCCPU to [h]decr callbacks
ppc: Pass PowerPCCPU to ppc_set_irq()
kvm: Pass CPUState to kvm_vcpu_ioctl()
kvm: Pass CPUState to kvm_arch_*
cpu: Move kvm_fd into CPUState
qdev-properties.c: Separate core from the code used only by qemu-system-*
qdev: Coding style fixes
cpu: Introduce CPUListState struct
target-alpha: Add support for -cpu ?
target-alpha: Turn CPU definitions into subclasses
target-alpha: Avoid leaking the alarm timer over reset
alpha: Pass AlphaCPU array to Typhoon
target-alpha: Let cpu_alpha_init() return AlphaCPU
This fixes a subtle bug. A bug that probably won't cause trouble for any
existing OS, but a bug anyway:
Intel SDM Volume 2, CPUID Instruction states:
> Two types of information are returned: basic and extended function
> information. If a value entered for CPUID.EAX is higher than the maximum
> input value for basic or extended function for that processor then the
> data for the highest basic information leaf is returned. For example,
> using the Intel Core i7 processor, the following is true:
>
> CPUID.EAX = 05H (* Returns MONITOR/MWAIT leaf. *)
> CPUID.EAX = 0AH (* Returns Architectural Performance Monitoring leaf. *)
> CPUID.EAX = 0BH (* Returns Extended Topology Enumeration leaf. *)
> CPUID.EAX = 0CH (* INVALID: Returns the same information as CPUID.EAX = 0BH. *)
> CPUID.EAX = 80000008H (* Returns linear/physical address size data. *)
> CPUID.EAX = 8000000AH (* INVALID: Returns same information as CPUID.EAX = 0BH. *)
AMD's CPUID Specification, on the other hand, is less specific:
> The CPUID instruction supports two sets or ranges of functions,
> standard and extended.
>
> • The smallest function number of the standard function range is
> Fn0000_0000. The largest function num- ber of the standard function
> range, for a particular implementation, is returned in CPUID
> Fn0000_0000_EAX.
>
> • The smallest function number of the extended function range is
> Fn8000_0000. The largest function num- ber of the extended function
> range, for a particular implementation, is returned in CPUID
> Fn8000_0000_EAX.
>
> Functions that are neither standard nor extended are undefined and
> should not be relied upon.
QEMU's behavior matched Intel's specification before, but this was
changed by commit b3baa152aa. This patch
restores the behavior documented by Intel when cpuid_xlevel2 is 0.
The existing behavior when cpuid_xlevel2 is set (falling back to
level=cpuid_xlevel) is being kept, as I couldn't find any public
documentation on the CPUID 0xC0000000 function range on Centaur CPUs.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
The file is only including error.h and qerror.h. Prefer explicit
inclusion of whatever files are needed.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Delay capping cpuid_level to 7 to realize time so property setters
for cpuid_7_0_ebx_features and "level" could be used in any order/time
between x86_cpu_initfn() and x86_cpu_realize().
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Instead of parsing the whole cpu_model string inside
cpu_x86_find_by_name(), first split it into the CPU model name and the
full feature string, then parse the feature string into pieces.
When using CPU model classes, those two pieces of information will be
used at different moments (CPU model name will be used to find CPU
class, feature string will be used after CPU object was created), so
making the split in two steps will make it easier to refactor the code
later.
This should also help on the CPU properties work, that will just need to
replace the cpu_x86_parse_featurestr() logic (and can keep the CPU model
lookup code as-is).
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
- Use spaces instead of tabs on cpu_x86_cpuid().
- Use braces on 'if' statement cpu_x86_find_by_name().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
SSSE3 support has been added to TCG more than 4 years ago in commit
4242b1bd8a. It has been disabled by
mistake in commit 551a2dec8f.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>
When adding the Haswell CPU model, I intended to make it a superset of the
features present on the SandyBridge model, but I have removed the SEP and
RDTSCP features from the feature list by mistake. This patch adds the
missing SEP and RDTSCP features (that are present on SandyBridge) to
Haswell.
Reported-by: Martin Kletzander <mkletzan@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Add a new base CPU model called Opteron_G5 to model the latest
Opteron CPUs. This increases the model value and model numbers and
adds TBM, F16C and FMA over the latest G4 model.
Signed-off-by: Andre Przywara <osp@andrep.de>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
[ehabkost: edited commit message]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Update QEMU's knowledge of CPUID bit names. This allows to
enable/disable those new features on QEMU's command line when
using KVM and prepares future feature enablement in QEMU.
This adds F16C, RDRAND, LWP, TBM, TopoExt, PerfCtr_Core, PerfCtr_NB,
FSGSBASE, BMI1, AVX2, BMI2, ERMS, PCID, InvPCID, RTM, RDSeed and ADX.
Sources where the AMD BKDG for Family 15h/Model 10h, Intel Software
Developer Manual, and the Linux kernel for the leaf 7 bits.
Signed-off-by: Andre Przywara <osp@andrep.de>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
[ehabkost: added CPUID_EXT_PCID]
[ehabkost: edited commit message]
[ehabkost: rebased against latest qemu.git master]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This fixes the following:
target-i386/cpu.o: In function `kvm_cpu_fill_host':
target-i386/cpu.c:783: undefined reference to `kvm_state'
I didn't notice the problem before because GCC was optimizing the entire
kvm_cpu_fill_host() function out (because all calls are conditional on
kvm_enabled()).
* cpu_x86_fill_model_id() is used only if CONFIG_KVM is set, so #ifdef it
entirely to avoid compiler warnings.
* kvm_cpu_fill_host() should be called only if KVM is enabled, so
use #ifdef CONFIG_KVM around the entire function body.
Reported-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
* qemu-kvm/uq/master: (28 commits)
update-linux-headers.sh: Handle new kernel uapi/ directories
target-i386: kvm_cpu_fill_host: use GET_SUPPORTED_CPUID
target-i386: cpu: make -cpu host/check/enforce code KVM-specific
target-i386: make cpu_x86_fill_host() void
Emulate qemu-kvms -no-kvm option
Issue warning when deprecated -tdf option is used
Issue warning when deprecated drive parameter boot=on|off is used
Use global properties to emulate -no-kvm-pit-reinjection
Issue warning when deprecated -no-kvm-pit is used
Use machine options to emulate -no-kvm-irqchip
cirrus_vga: allow configurable vram size
target-i386: Add missing kvm cpuid feature name
i386: cpu: add missing CPUID[EAX=7,ECX=0] flag names
i386: kvm: filter CPUID leaf 7 based on GET_SUPPORTED_CPUID, too
i386: kvm: reformat filter_features_for_kvm() code
i386: kvm: filter CPUID feature words earlier, on cpu.c
i386: kvm: mask cpuid_ext4_features bits earlier
i386: kvm: mask cpuid_kvm_features earlier
i386: kvm: x2apic is not supported without in-kernel irqchip
i386: kvm: set CPUID_EXT_TSC_DEADLINE_TIMER on kvm_arch_get_supported_cpuid()
...
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Change the kvm_cpu_fill_host() function to use
kvm_arch_get_supported_cpuid() instead of running the CPUID instruction
directly, when checking for supported CPUID features.
This should solve two problems at the same time:
* "-cpu host" was not enabling features that don't need support on
the host CPU (e.g. x2apic);
* "check" and "enforce" options were not detecting problems when the
host CPU did support a feature, but the KVM kernel code didn't
support it.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Rationale:
* "-cpu host" is available only when using KVM
* The current implementation of -cpu check/enforce
(check_features_against_host()) makes sense only when using KVM.
So this makes the functions check_features_against_host() and
cpu_x86_fill_host() KVM-specific, document them as such, and rename them
to kvm_check_features_against_host() and kvm_cpu_fill_host().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
The return value of that function is always 0, and is always ignored.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Currently "-cpu host,-kvmclock,-kvm_nopiodelay,-kvm_mmu" does not
turn off all bits in CPUID 0x40000001 EAX.
The missing ones is KVM_FEATURE_STEAL_TIME.
This adds the name kvm_steal_time.
Signed-off-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Now that CPUID leaf 7 features can be enabled/disabled on the
command-line, we need to filter them properly using GET_SUPPORTED_CPUID,
at the same place where other features are filtered out.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Cosmetic, but it will also help to make futher patches easier to review.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
cpu.c contains the code that will check if all requested CPU features
are available, so the filtering of KVM features must be there, so we can
implement "check" and "enforce" properly.
The only point where kvm_arch_init_vcpu() is called on i386 is:
- cpu_x86_init()
- x86_cpu_realize() (after cpu_x86_register() is called)
- qemu_init_vcpu()
- qemu_kvm_start_vcpu()
- qemu_kvm_thread_fn() (on a new thread)
- kvm_init_vcpu()
- kvm_arch_init_vcpu()
With this patch, the filtering will be done earlier, at:
- cpu_x86_init()
- cpu_x86_register() (before x86_cpu_realize() is called)
Also, the KVM CPUID filtering will now be done at the same place where
the TCG CPUID feature filtering is done. Later, the code can be changed
to use the same filtering code for the "check" and "enforce" modes, as
now the cpu.c code knows exactly which CPU features are going to be
exposed to the guest (and much earlier).
One thing I was worrying about when doing this is that
kvm_arch_get_supported_cpuid() depends on kvm_irqchip_in_kernel(), and
maybe the 'kvm_kernel_irqchip' global variable wasn't initialized yet at
CPU creation time. But kvm_kernel_irqchip is initialized during
kvm_init(), that is called very early (much earlier than the machine
init function), and kvm_init() is already a requirement to run the
GET_SUPPORTED_CPUID ioctl() (as kvm_init() initializes the kvm_state
global variable).
Side note: it would be nice to keep KVM-specific code inside kvm.c. The
problem is that properly implementing -cpu check/enforce code (that's
inside cpu.c) depends directly on the feature bit filtering done using
kvm_arch_get_supported_cpuid(). Currently -cpu check/enforce is broken
because it simply uses the host CPU feature bits instead of
GET_SUPPORTED_CPUID, and we need to fix that.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Prepares for using a link<> property to connect APIC with CPU and for
changing the CPU APIs to CPUState.
Resolve Coding Style warnings by moving the closing parenthesis of
foreach_apic() macro to next line.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
This prepares for changing the variable type from void*.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
(L)APIC is a part of cpu [1] so move APIC initialization inside of
x86_cpu object. Since cpu_model and override flags currently specify
whether APIC should be created or not, APIC creation&initialization is
moved into x86_cpu_apic_init() which is called from x86_cpu_realize().
[1] - all x86 cpus have integrated APIC if we overlook existence of i486,
and it's more convenient to model after majority of them.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Enable KVM PV EOI by default. You can still disable it with
-kvm_pv_eoi cpu flag. To avoid breaking cross-version migration,
enable only for qemu 1.3 (or in the future, newer) machine type.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
I removed a line by mistake on commit
3b671a40ca, containing the flags lm/i64,
3dnow, and 3dnowext. This patch restores the removed line.
Reviewed-by: Don Slutz <Don@cloudswitch.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Move the DUMP_FPU and DUMP_CCOP flags for cpu_dump_state() from being
x86-specific flags to being generic ones. This allows us to drop some
TARGET_I386 ifdefs in various places, and means that we can (potentially)
be more consistent across architectures about which monitor commands or
debug abort printouts include FPU register contents and info about
QEMU's condition-code optimisations.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This patch implements Supervisor Mode Execution Prevention (SMEP) and
Supervisor Mode Access Prevention (SMAP) for x86. The purpose of the
patch, obviously, is to help kernel developers debug the support for
those features.
A fair bit of the code relates to the handling of CPUID features. The
CPUID code probably would get greatly simplified if all the feature
bit words were unified into a single vector object, but in the
interest of producing a minimal patch for SMEP/SMAP, and because I had
very limited time for this project, I followed the existing style.
[ v2: don't change the definition of the qemu64 CPU shorthand, since
that breaks loading old snapshots. Per Anthony Liguori this can be
fixed once the CPU feature set is snapshot.
Change the coding style slightly to conform to checkpatch.pl. ]
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
The -cpu configuration interface is based on a list of feature names or
properties, on a single namespace, so there's no need to mention on
which CPUID leaf/register each flag is located.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Instead of having duplicate feature names on the ext2_feature array for
the AMD feature bit aliases, we keep the feature names only on the
feature_name[] array, and copy the corresponding bits to
cpuid_ext2_features in case the CPU vendor is AMD.
This will:
- Make sure we don't set the feature bit aliases on Intel CPUs;
- Make it easier to convert feature bits to CPU properties, as now we
have a single bit on the x86_def_t struct for each CPU feature.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Both constants have the same value, but CPUID_EXT2_AMD_ALIASES is
defined without using magic numbers.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
* stefanha/trivial-patches:
w32: Always use standard instead of native format strings
net/socket: Fix compiler warning (regression for MinGW)
linux-user: Remove redundant null check and replace free by g_free
qemu-timer: simplify qemu_run_timers
TextConsole: saturate escape parameter in TTY_STATE_CSI
curses: don't initialize curses when qemu is daemonized
dtrace backend: add function to reserved words
pflash_cfi01: Fix warning caused by unreachable code
ioh3420: Remove unreachable code
lm4549: Fix buffer overflow
cadence_uart: Fix buffer overflow
qemu-sockets: Fix potential memory leak
qemu-ga: Remove unreachable code after g_error
target-i386: Allow tsc-frequency to be larger then 2.147G
The check using INT_MAX (2147483647) is wrong in this case.
Signed-off-by: Fred Oliveira <foliveira@cloudswitch.com>
Signed-off-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
It was only used by now removed setfeatures() function.
Suggested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
It's nice to have a flexible system to maintain CPU models as data, but
this is holding us from making improvements in the CPU code because it's
not using the common infra-structure, and because the machine-type data
is still inside C code.
Users who want to configure CPU features directly may simply use the
"-cpu" command-line option (and maybe an equivalent -device option in
the future) to set CPU features.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Those models are maintained by QEMU and may require compatibility code
to be added when making some changes. Keeping the data in the C source
code should make it simpler to handle those details.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Don Slutz <Don@CloudSwitch.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Since the only user of the extended cpu_list_id() format
was the x86 ?model/?dump/?cpuid output, we can drop it
completely.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Commit c8057f95 (accidentally) disabled the ability to pass
option strings starting with '?' to the target-specific
cpu_list function, so the target-i386 specific "-cpu ?dump",
"-cpu ?cpuid" and "-cpu ?model" stopped working.
Since these options are undocumented and not used by libvirt,
simply drop them completely rather than reinstating them
with new style syntax. Instead, we fold the ?model and ?cpuid
output into the output of the plain "-cpu help" output. The
detailed output produced by ?dump is dropped.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Commit ef8621b1a3 added an include
file which is not available for MinGW compilations.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
We have a problem with how we handle migration with KVM paravirt features.
We unconditionally enable paravirt features regardless of whether we know how
to migrate them.
We also don't tie paravirt features to specific machine types so an old QEMU on
a new kernel would expose features that never existed.
The 1.2 cycle is over and as things stand, migration is broken. Michael has
another series that adds support for migrating PV EOI and attempts to make it
work correctly for different machine types.
After speaking with Michael on IRC, we agreed to take this patch plus 1 & 4
from his series. This makes sure QEMU can migrate PV EOI if it's enabled, but
does not enable it by default.
This also means that we won't unconditionally enable new features for guests
future proofing us from this happening again in the future.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
mingw32 seems to want the declaration to also carry the weak attribute.
Strangely, gcc on Linux absolutely does not want the declaration to be marked
as weak. This may not be the right fix, but it seems to do the trick.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* 'x86cpu_qom_tcg_v2' of git://github.com/imammedo/qemu:
target-i386: move tcg initialization into x86_cpu_initfn()
cleanup cpu_set_debug_excp_handler
target-xtensa: drop usage of prev_debug_excp_handler
target-i386: drop usage of prev_debug_excp_handler
Moving reset callback into cpu object from board level and
resetting cpu at the end of x86_cpu_realize() will allow properly
create cpu object during run-time (hotplug) without calling reset externaly.
When reset over QOM hierarchy is implemented, reset callback
should be removed.
v2:
- leave cpu_reset in pc_new_cpu() for now, it's to be cleaned up when APIC
init is moved in cpu.c
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
MP initialization protocol differs between cpu families, and for P6 and
onward models it is up to CPU to decide if it will be BSP using this
protocol, so try to model this. However there is no point in implementing
MP initialization protocol in qemu. Thus first CPU is always marked as BSP.
This patch:
- moves decision to designate BSP from board into cpu, making cpu
self-sufficient in this regard. Later it will allow to cleanup hw/pc.c
and remove cpu_reset and wrappers from there.
- stores flag that CPU is BSP in IA32_APIC_BASE to model behavior
described in Inted SDM vol 3a part 1 chapter 8.4.1
- uses MSR_IA32_APICBASE_BSP flag in apic_base for checking if cpu is BSP
patch is based on Jan Kiszka's proposal:
http://thread.gmane.org/gmane.comp.emulators.qemu/100806
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This patch makes Qemu recognize the PCID feature specified from configuration or command line options.
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Support the new PV EOI flag in kvm - it recently got merged
into kvm.git. Set by default with -cpu kvm.
Set for -cpu qemu by adding +kvm_pv_eoi.
Clear by adding -kvm_pv_eoi to -cpu option.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
In order to make cpu object not depended on external ad-hoc
initialization routines, move tcg initialization from cpu_x86_init
inside cpu object "x86_cpu_initfn()".
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
This new 'QEmu' was recently added.
Replace it by the official all upper case 'QEMU'.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
QEMU exposes its version to the guest's hardware and in some cases that is wrong
(e.g. Windows prints messages about driver updates when you switch
the QEMU version).
There is a new field now on the struct QEmuMachine, hw_version, which may
contain the version that the specific machine should report. If that field is
set, then that machine will report that version to the guest.
Signed-off-by: Crístian Viana <vianac@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Changes v2 -> v3;
- Check for kvm_enabled() before setting cpuid_7_0_ebx_features
Changes v1 -> v2:
- Use kvm_arch_get_supported_cpuid() instead of host_cpuid() on
cpu_x86_fill_host().
We should use GET_SUPPORTED_CPUID for all bits on "-cpu host"
eventually, but I am not changing all the other CPUID leaves because
we may not be able to test such an intrusive change in time for 1.1.
Description of the bug:
Since QEMU 0.15, the CPUID information on CPUID[EAX=7,ECX=0] is being
returned unfiltered to the guest, directly from the GET_SUPPORTED_CPUID
return value.
The problem is that this makes the resulting CPU feature flags
unpredictable and dependent on the host CPU and kernel version. This
breaks live-migration badly if migrating from a host CPU that supports
some features on that CPUID leaf (running a recent kernel) to a kernel
or host CPU that doesn't support it.
Migration also is incorrect (the virtual CPU changes under the guest's
feet) if you migrate in the opposite direction (from an old CPU/kernel
to a new CPU/kernel), but with less serious consequences (guests
normally query CPUID information only once on boot).
Fortunately, the bug affects only users using cpudefs with level >= 7.
The right behavior should be to explicitly enable those features on
[cpudef] config sections or on the "-cpu" command-line arguments. Right
now there is no predefined CPU model on QEMU that has those features:
the latest Intel model we have is Sandy Bridge.
I would like to get this fixed on 1.1, so I am submitting this patch,
that enables those features only if "-cpu host" is being used (as we
don't have any pre-defined CPU model that actually have those features).
After 1.1 is released, we can make those features properly configurable
on [cpudef] and -cpu configuration.
One problem is: with this patch, users with the following setup:
- Running QEMU 1.0;
- Using a cpudef having level >= 7;
- Running a kernel that supports the features on CPUID leaf 7; and
- Running on a CPU that supports some features on CPUID leaf 7
won't be able to live-migrate to QEMU 1.1. But for these users
live-migration is already broken (they can't live-migrate to hosts with
older CPUs or older kernels, already), I don't see how to avoid this
problem.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Commit de024815e3 (target-i386: QOM'ify
CPU init) moved mce_init() call from helper.c:cpu_x86_init() into
X86CPU's cpu.c:x86_cpu_initfn().
mce_init() checks for a family >= 6 though, so we could end up with a
sequence such as for -cpu somecpu,family=6:
x86_cpu_initfn => X86CPU::family == 5
mce_init => no-op
cpu_x86_register => X86CPU::family = 6
=> MCE unexpectedly not init'ed
or for -cpu someothercpu,family=5:
x86_cpu_initfn => X86CPU::family == 6
mce_init => init'ed
cpu_x86_register => X86CPU::family = 5
=> MCE unexpectedly init'ed
Therefore partially revert the above commit. To avoid moving
mce_init() back into helper.c, foresightedly move it into a
new x86_cpu_realize() function and, in lack of ObjectClass::realize,
call it directly from cpu_x86_init().
While at it, move the qemu_init_vcpu() call that used to follow
mce_init() in cpu_x86_init() into the new realizefn as well.
Reported-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Use Hz as unit.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Using it now would incur converting the three x86_def_t vendor words
into a string for object_property_set_str(), then back to three words
in the "vendor" setter.
The built-in CPU definitions use numeric preprocessor defines to
initialize the three words in a charset-safe way, so do not change the
fields to char[12] just to use the setter.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Add the property early in the initfn so that it can be used in helpers
such as mce_init().
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
[AF: Add an error_free(), spotted by Michael Roth]
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
A family field value of 0xf and extended family field value of 0xff is
the maximum representable unsigned family number.
All other CPUID property values are bounds-checked, so add a check here
for symmetry before we adopt it in a property setter.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Avoids an x86_env_get_cpu() call there, to work with QOM properties.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Don't assume zeroed cpuid_model[] fields.
This didn't break anything yet but QOM properties should be able to set
the value to something else without setting an intermediate zero string.
Reviewed-by: Eduardo Habhost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
[AF: Use memset() instead of for loop, suggested by Igor]
Signed-off-by: Andreas Färber <afaerber@suse.de>
Move code from cpu_x86_init() to new QOM x86_cpu_initfn().
Also move mce_init() to cpu.c since it's used nowhere else.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Embed CPUX86State as first member of X86CPU.
Distinguish between "x86_64-cpu" and "i386-cpu".
Drop cpu_x86_close() in favor of calling object_delete() directly.
For now let CPUClass::reset() call cpu_state_reset().
Signed-off-by: Andreas Färber <afaerber@suse.de>
