9 years agoKVM: VMX: Respect interrupt window in big real mode
Avi Kivity [Sun, 19 Sep 2010 12:34:08 +0000]
KVM: VMX: Respect interrupt window in big real mode

If an interrupt is pending, we need to stop emulation so we
can inject it.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: VMX: Emulated real mode interrupt injection
Mohammed Gamal [Sun, 19 Sep 2010 12:34:07 +0000]
KVM: VMX: Emulated real mode interrupt injection

Replace the inject-as-software-interrupt hack we currently have with
emulated injection.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: Add kvm_inject_realmode_interrupt() wrapper
Mohammed Gamal [Sun, 19 Sep 2010 12:34:06 +0000]
KVM: Add kvm_inject_realmode_interrupt() wrapper

This adds a wrapper function kvm_inject_realmode_interrupt() around the
emulator function emulate_int_real() to allow real mode interrupt injection.

[avi: initialize operand and address sizes before emulating interrupts]
[avi: initialize rip for real mode interrupt injection]
[avi: clear interrupt pending flag after emulating interrupt injection]

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: x86 emulator: Expose emulate_int_real()
Mohammed Gamal [Sun, 19 Sep 2010 12:34:05 +0000]
KVM: x86 emulator: Expose emulate_int_real()

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: MMU: fix counting of rmap entries in rmap_add()
Hillf Danton [Sat, 18 Sep 2010 00:41:02 +0000]
KVM: MMU: fix counting of rmap entries in rmap_add()

It seems that rmap entries are under counted.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: document 'kvm.mmu_audit' parameter
Xiao Guangrong [Mon, 20 Sep 2010 14:17:48 +0000]
KVM: document 'kvm.mmu_audit' parameter

Document this parameter into Documentation/kernel-parameters.txt

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: fix the description of kvm-amd.nested in documentation
Xiao Guangrong [Mon, 20 Sep 2010 14:16:45 +0000]
KVM: fix the description of kvm-amd.nested in documentation

The default state of 'kvm-amd.nested' is enabled now, so fix the documentation

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: SVM: do not generate "external interrupt exit" if other exit is pending
Gleb Natapov [Mon, 20 Sep 2010 08:15:32 +0000]
KVM: SVM: do not generate "external interrupt exit" if other exit is pending

Nested SVM checks for external interrupt after injecting nested exception.
In case there is external interrupt pending the code generates "external
interrupt exit" and overwrites previous exit info. If previously injected
exception already generated exit it will be lost.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: Convert PIC lock from raw spinlock to ordinary spinlock
Avi Kivity [Sun, 19 Sep 2010 16:44:07 +0000]
KVM: Convert PIC lock from raw spinlock to ordinary spinlock

The PIC code used to be called from preempt_disable() context, which
wasn't very good for PREEMPT_RT.  That is no longer the case, so move
back from raw_spinlock_t to spinlock_t.

Signed-off-by: Avi Kivity <avi@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: x86: Fix kvmclock bug
Zachary Amsden [Sun, 19 Sep 2010 00:38:12 +0000]
KVM: x86: Fix kvmclock bug

If preempted after kvmclock values are updated, but before hardware
virtualization is entered, the last tsc time as read by the guest is
never set.  It underflows the next time kvmclock is updated if there
has not yet been a successful entry / exit into hardware virt.

Fix this by simply setting last_tsc to the newly read tsc value so
that any computed nsec advance of kvmclock is nulled.

Signed-off-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: MMU: Don't track nested fault info in error-code
Joerg Roedel [Tue, 14 Sep 2010 15:46:12 +0000]
KVM: MMU: Don't track nested fault info in error-code

This patch moves the detection whether a page-fault was
nested or not out of the error code and moves it into a
separate variable in the fault struct.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: VMX: Move fixup_rmode_irq() to avoid forward declaration
Avi Kivity [Thu, 22 Jul 2010 10:09:54 +0000]
KVM: VMX: Move fixup_rmode_irq() to avoid forward declaration

No code changes.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: Non-atomic interrupt injection
Avi Kivity [Tue, 20 Jul 2010 12:06:17 +0000]
KVM: Non-atomic interrupt injection

Change the interrupt injection code to work from preemptible, interrupts
enabled context.  This works by adding a ->cancel_injection() operation
that undoes an injection in case we were not able to actually enter the guest
(this condition could never happen with atomic injection).

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: VMX: Parameterize vmx_complete_interrupts() for both exit and entry
Avi Kivity [Tue, 20 Jul 2010 11:43:23 +0000]
KVM: VMX: Parameterize vmx_complete_interrupts() for both exit and entry

Currently vmx_complete_interrupts() can decode event information from vmx
exit fields into the generic kvm event queues.  Make it able to decode
the information from the entry fields as well by parametrizing it.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: VMX: Move real-mode interrupt injection fixup to vmx_complete_interrupts()
Avi Kivity [Thu, 22 Jul 2010 09:54:21 +0000]
KVM: VMX: Move real-mode interrupt injection fixup to vmx_complete_interrupts()

This allows reuse of vmx_complete_interrupts() for cancelling injections.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: VMX: Split up vmx_complete_interrupts()
Avi Kivity [Tue, 20 Jul 2010 11:31:20 +0000]
KVM: VMX: Split up vmx_complete_interrupts()

vmx_complete_interrupts() does too much, split it up:
 - vmx_vcpu_run() gets the "cache important vmcs fields" part
 - a new vmx_complete_atomic_exit() gets the parts that must be done atomically
 - a new vmx_recover_nmi_blocking() does what its name says
 - vmx_complete_interrupts() retains the event injection recovery code

This helps in reducing the work done in atomic context.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: Check for pending events before attempting injection
Avi Kivity [Tue, 27 Jul 2010 09:30:24 +0000]
KVM: Check for pending events before attempting injection

Instead of blindly attempting to inject an event before each guest entry,
check for a possible event first in vcpu->requests.  Sites that can trigger
event injection are modified to set KVM_REQ_EVENT:

- interrupt, nmi window opening
- ppr updates
- i8259 output changes
- local apic irr changes
- rflags updates
- gif flag set
- event set on exit

This improves non-injecting entry performance, and sets the stage for
non-atomic injection.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Fix regression with ept memory types merged into non-ept page tables
Avi Kivity [Mon, 13 Sep 2010 14:45:28 +0000]
KVM: MMU: Fix regression with ept memory types merged into non-ept page tables

Commit "KVM: MMU: Make tdp_enabled a mmu-context parameter" made real-mode
set ->direct_map, and changed the code that merges in the memory type depend
on direct_map instead of tdp_enabled.  However, in this case what really
matters is tdp, not direct_map, since tdp changes the pte format regardless
of whether the mapping is direct or not.

As a result, real-mode shadow mappings got corrupted with ept memory types.
The result was a huge slowdown, likely due to the cache being disabled.

Change it back as the simplest fix for the regression (real fix is to move
all that to vmx code, and not use tdp_enabled as a synonym for ept).

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: Document that KVM_GET_SUPPORTED_CPUID may return emulated values
Avi Kivity [Sun, 12 Sep 2010 14:39:11 +0000]
KVM: Document that KVM_GET_SUPPORTED_CPUID may return emulated values

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: X86: Report SVM bit to userspace only when supported
Joerg Roedel [Fri, 10 Sep 2010 15:31:06 +0000]
KVM: X86: Report SVM bit to userspace only when supported

This patch fixes a bug in KVM where it _always_ reports the
support of the SVM feature to userspace. But KVM only
supports SVM on AMD hardware and only when it is enabled in
the kernel module. This patch fixes the wrong reporting.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: SVM: Report Nested Paging support to userspace
Joerg Roedel [Fri, 10 Sep 2010 15:31:05 +0000]
KVM: SVM: Report Nested Paging support to userspace

This patch implements the reporting of the nested paging
feature support to userspace.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: SVM: Expect two more candiates for exit_int_info
Joerg Roedel [Fri, 10 Sep 2010 15:31:04 +0000]
KVM: SVM: Expect two more candiates for exit_int_info

This patch adds INTR and NMI intercepts to the list of
expected intercepts with an exit_int_info set. While this
can't happen on bare metal it is architectural legal and may
happen with KVMs SVM emulation.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: SVM: Initialize Nested Nested MMU context on VMRUN
Joerg Roedel [Fri, 10 Sep 2010 15:31:03 +0000]
KVM: SVM: Initialize Nested Nested MMU context on VMRUN

This patch adds code to initialize the Nested Nested Paging
MMU context when the L1 guest executes a VMRUN instruction
and has nested paging enabled in its VMCB.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: SVM: Implement MMU helper functions for Nested Nested Paging
Joerg Roedel [Fri, 10 Sep 2010 15:31:02 +0000]
KVM: SVM: Implement MMU helper functions for Nested Nested Paging

This patch adds the helper functions which will be used in
the mmu context for handling nested nested page faults.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Track NX state in struct kvm_mmu
Joerg Roedel [Fri, 10 Sep 2010 15:31:01 +0000]
KVM: MMU: Track NX state in struct kvm_mmu

With Nested Paging emulation the NX state between the two
MMU contexts may differ. To make sure that always the right
fault error code is recorded this patch moves the NX state
into struct kvm_mmu so that the code can distinguish between
L1 and L2 NX state.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Allow long mode shadows for legacy page tables
Joerg Roedel [Fri, 10 Sep 2010 15:31:00 +0000]
KVM: MMU: Allow long mode shadows for legacy page tables

Currently the KVM softmmu implementation can not shadow a 32
bit legacy or PAE page table with a long mode page table.
This is a required feature for nested paging emulation
because the nested page table must alway be in host format.
So this patch implements the missing pieces to allow long
mode page tables for page table types.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Refactor mmu_alloc_roots function
Joerg Roedel [Fri, 10 Sep 2010 15:30:59 +0000]
KVM: MMU: Refactor mmu_alloc_roots function

This patch factors out the direct-mapping paths of the
mmu_alloc_roots function into a seperate function. This
makes it a lot easier to avoid all the unnecessary checks
done in the shadow path which may break when running direct.
In fact, this patch already fixes a problem when running PAE
guests on a PAE shadow page table.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce kvm_pdptr_read_mmu
Joerg Roedel [Fri, 10 Sep 2010 15:30:58 +0000]
KVM: MMU: Introduce kvm_pdptr_read_mmu

This function is implemented to load the pdptr pointers of
the currently running guest (l1 or l2 guest). Therefore it
takes care about the current paging mode and can read pdptrs
out of l2 guest physical memory.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Add kvm_mmu parameter to load_pdptrs function
Joerg Roedel [Fri, 10 Sep 2010 15:30:57 +0000]
KVM: MMU: Add kvm_mmu parameter to load_pdptrs function

This function need to be able to load the pdptrs from any
mmu context currently in use. So change this function to
take an kvm_mmu parameter to fit these needs.
As a side effect this patch also moves the cached pdptrs
from vcpu_arch into the kvm_mmu struct.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: X86: Propagate fetch faults
Joerg Roedel [Fri, 10 Sep 2010 15:30:56 +0000]
KVM: X86: Propagate fetch faults

KVM currently ignores fetch faults in the instruction
emulator. With nested-npt we could have such faults. This
patch adds the code to handle these.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Propagate the right fault back to the guest after gva_to_gpa
Joerg Roedel [Fri, 10 Sep 2010 15:30:55 +0000]
KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa

This patch implements logic to make sure that either a
page-fault/page-fault-vmexit or a nested-page-fault-vmexit
is propagated back to the guest.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce init_kvm_nested_mmu()
Joerg Roedel [Fri, 10 Sep 2010 15:30:54 +0000]
KVM: MMU: Introduce init_kvm_nested_mmu()

This patch introduces the init_kvm_nested_mmu() function
which is used to re-initialize the nested mmu when the l2
guest changes its paging mode.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce kvm_read_nested_guest_page()
Joerg Roedel [Fri, 10 Sep 2010 15:30:53 +0000]
KVM: MMU: Introduce kvm_read_nested_guest_page()

This patch introduces the kvm_read_guest_page_x86 function
which reads from the physical memory of the guest. If the
guest is running in guest-mode itself with nested paging
enabled it will read from the guest's guest physical memory
instead.
The patch also changes changes the code to use this function
where it is necessary.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Make walk_addr_generic capable for two-level walking
Joerg Roedel [Fri, 10 Sep 2010 15:30:52 +0000]
KVM: MMU: Make walk_addr_generic capable for two-level walking

This patch uses kvm_read_guest_page_tdp to make the
walk_addr_generic functions suitable for two-level page
table walking.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: X86: Add kvm_read_guest_page_mmu function
Joerg Roedel [Fri, 10 Sep 2010 15:30:51 +0000]
KVM: X86: Add kvm_read_guest_page_mmu function

This patch adds a function which can read from the guests
physical memory or from the guest's guest physical memory.
This will be used in the two-dimensional page table walker.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Implement nested gva_to_gpa functions
Joerg Roedel [Fri, 10 Sep 2010 15:30:50 +0000]
KVM: MMU: Implement nested gva_to_gpa functions

This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: X86: Introduce pointer to mmu context used for gva_to_gpa
Joerg Roedel [Fri, 10 Sep 2010 15:30:49 +0000]
KVM: X86: Introduce pointer to mmu context used for gva_to_gpa

This patch introduces the walk_mmu pointer which points to
the mmu-context currently used for gva_to_gpa translations.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Add infrastructure for two-level page walker
Joerg Roedel [Fri, 10 Sep 2010 15:30:48 +0000]
KVM: MMU: Add infrastructure for two-level page walker

This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses into l1_gpa addresses.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce generic walk_addr function
Joerg Roedel [Fri, 10 Sep 2010 15:30:47 +0000]
KVM: MMU: Introduce generic walk_addr function

This is the first patch in the series towards a generic
walk_addr implementation which could walk two-dimensional
page tables in the end. In this first step the walk_addr
function is renamed into walk_addr_generic which takes a
mmu context as an additional parameter.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Track page fault data in struct vcpu
Joerg Roedel [Fri, 10 Sep 2010 15:30:46 +0000]
KVM: MMU: Track page fault data in struct vcpu

This patch introduces a struct with two new fields in
vcpu_arch for x86:

* fault.address
* fault.error_code

This will be used to correctly propagate page faults back
into the guest when we could have either an ordinary page
fault or a nested page fault. In the case of a nested page
fault the fault-address is different from the original
address that should be walked. So we need to keep track
about the real fault-address.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Let is_rsvd_bits_set take mmu context instead of vcpu
Joerg Roedel [Fri, 10 Sep 2010 15:30:45 +0000]
KVM: MMU: Let is_rsvd_bits_set take mmu context instead of vcpu

This patch changes is_rsvd_bits_set() function prototype to
take only a kvm_mmu context instead of a full vcpu.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce kvm_init_shadow_mmu helper function
Joerg Roedel [Fri, 10 Sep 2010 15:30:44 +0000]
KVM: MMU: Introduce kvm_init_shadow_mmu helper function

Some logic of the init_kvm_softmmu function is required to
build the Nested Nested Paging context. So factor the
required logic into a seperate function and export it.
Also make the whole init path suitable for more than one mmu
context.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce inject_page_fault function pointer
Joerg Roedel [Fri, 10 Sep 2010 15:30:43 +0000]
KVM: MMU: Introduce inject_page_fault function pointer

This patch introduces an inject_page_fault function pointer
into struct kvm_mmu which will be used to inject a page
fault. This will be used later when Nested Nested Paging is
implemented.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Introduce get_cr3 function pointer
Joerg Roedel [Fri, 10 Sep 2010 15:30:42 +0000]
KVM: MMU: Introduce get_cr3 function pointer

This function pointer in the MMU context is required to
implement Nested Nested Paging.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: X86: Introduce a tdp_set_cr3 function
Joerg Roedel [Fri, 10 Sep 2010 15:30:41 +0000]
KVM: X86: Introduce a tdp_set_cr3 function

This patch introduces a special set_tdp_cr3 function pointer
in kvm_x86_ops which is only used for tpd enabled mmu
contexts. This allows to remove some hacks from svm code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Make set_cr3 a function pointer in kvm_mmu
Joerg Roedel [Fri, 10 Sep 2010 15:30:40 +0000]
KVM: MMU: Make set_cr3 a function pointer in kvm_mmu

This is necessary to implement Nested Nested Paging. As a
side effect this allows some cleanups in the SVM nested
paging code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Make tdp_enabled a mmu-context parameter
Joerg Roedel [Fri, 10 Sep 2010 15:30:39 +0000]
KVM: MMU: Make tdp_enabled a mmu-context parameter

This patch changes the tdp_enabled flag from its global
meaning to the mmu-context and renames it to direct_map
there. This is necessary for Nested SVM with emulation of
Nested Paging where we need an extra MMU context to shadow
the Nested Nested Page Table.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: Check for root_level instead of long mode
Joerg Roedel [Fri, 10 Sep 2010 15:30:38 +0000]
KVM: MMU: Check for root_level instead of long mode

The walk_addr function checks for !is_long_mode in its 64
bit version. But what is meant here is a check for pae
paging. Change the condition to really check for pae paging
so that it also works with nested nested paging.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: x86: Emulate MSR_EBC_FREQUENCY_ID
Jes Sorensen [Thu, 9 Sep 2010 10:06:46 +0000]
KVM: x86: Emulate MSR_EBC_FREQUENCY_ID

Some operating systems store data about the host processor at the
time of installation, and when booted on a more uptodate cpu tries
to read MSR_EBC_FREQUENCY_ID. This has been found with XP.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agox86: Define MSR_EBC_FREQUENCY_ID
Jes Sorensen [Thu, 9 Sep 2010 10:06:45 +0000]
x86: Define MSR_EBC_FREQUENCY_ID

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: SVM: Clean up rip handling in vmrun emulation
Roedel, Joerg [Fri, 3 Sep 2010 12:21:40 +0000]
KVM: SVM: Clean up rip handling in vmrun emulation

This patch changes the rip handling in the vmrun emulation
path from using next_rip to the generic kvm register access
functions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: SVM: Restore correct registers after sel_cr0 intercept emulation
Joerg Roedel [Thu, 2 Sep 2010 15:29:46 +0000]
KVM: SVM: Restore correct registers after sel_cr0 intercept emulation

This patch implements restoring of the correct rip, rsp, and
rax after the svm emulation in KVM injected a selective_cr0
write intercept into the guest hypervisor. The problem was
that the vmexit is emulated in the instruction emulation
which later commits the registers right after the write-cr0
instruction. So the l1 guest will continue to run with the
l2 rip, rsp and rax resulting in unpredictable behavior.

This patch is not the final word, it is just an easy patch
to fix the issue. The real fix will be done when the
instruction emulator is made aware of nested virtualization.
Until this is done this patch fixes the issue and provides
an easy way to fix this in -stable too.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: MMU: Fix 32 bit legacy paging with NPT
Joerg Roedel [Thu, 2 Sep 2010 15:29:45 +0000]
KVM: MMU: Fix 32 bit legacy paging with NPT

This patch fixes 32 bit legacy paging with NPT enabled. The
mmu_check_root call on the top-level of the loop causes
root_gfn to take values (in the tdp_enabled path) which are
outside of guest memory. So the mmu_check_root call fails at
some point in the loop interation causing the guest to
tiple-fault.
This patch changes the mmu_check_root calls to the places
where they are really necessary. As a side-effect it
introduces a check for the root of a pae page table too.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

9 years agoKVM: PPC: Move of include to __KERNEL__ section
Alexander Graf [Fri, 3 Sep 2010 08:22:19 +0000]
KVM: PPC: Move of include to __KERNEL__ section

We have to protect the include for linux/of.h by __KERNEL__ so it doesn't
accidently get referenced outside.

This patch fixes this and makes the tree compile again.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Add documentation for magic page enhancements
Alexander Graf [Tue, 31 Aug 2010 02:25:39 +0000]
KVM: PPC: Add documentation for magic page enhancements

This documents how to detect additional features inside the magic
page when a guest maps it.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Fix compile error in e500_tlb.c
Alexander Graf [Tue, 31 Aug 2010 01:45:39 +0000]
KVM: PPC: Fix compile error in e500_tlb.c

The e500_tlb.c file didn't compile for me due to the following error:

arch/powerpc/kvm/e500_tlb.c: In function ‘kvmppc_e500_shadow_map’:
arch/powerpc/kvm/e500_tlb.c:300: error: format ‘%lx’ expects type ‘long unsigned int’, but argument 2 has type ‘gfn_t’

So let's explicitly cast the argument to make printk happy.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: e500_tlb: Fix a minor copy-paste tracing bug
Kyle Moffett [Mon, 30 Aug 2010 15:38:39 +0000]
KVM: PPC: e500_tlb: Fix a minor copy-paste tracing bug

The kvmppc_e500_stlbe_invalidate() function was trying to pass too many
parameters to trace_kvm_stlb_inval().  This appears to be a bad
copy-paste from a call to trace_kvm_stlb_write().

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Document KVM_INTERRUPT ioctl
Alexander Graf [Tue, 31 Aug 2010 00:03:32 +0000]
KVM: PPC: Document KVM_INTERRUPT ioctl

This adds some documentation for the KVM_INTERRUPT special cases that
PowerPC now implements.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Implement level interrupts for BookE
Alexander Graf [Mon, 30 Aug 2010 12:03:24 +0000]
KVM: PPC: Implement level interrupts for BookE

BookE also wants to support level based interrupts, so let's implement
all the necessary logic there. We need to trick a bit here because the
irqprios are 1:1 assigned to architecture defined values. But since there
is some space left there, we can just pick a random one and move it later
on - it's internal anyways.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Expose level based interrupt cap
Alexander Graf [Mon, 30 Aug 2010 11:50:45 +0000]
KVM: PPC: Expose level based interrupt cap

Now that we have all the level interrupt magic in place, let's
expose the capability to user space, so it can make use of it!

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Implement Level interrupts on Book3S
Alexander Graf [Mon, 30 Aug 2010 08:44:15 +0000]
KVM: PPC: Implement Level interrupts on Book3S

The current interrupt logic is just completely broken. We get a notification
from user space, telling us that an interrupt is there. But then user space
expects us that we just acknowledge an interrupt once we deliver it to the
guest.

This is not how real hardware works though. On real hardware, the interrupt
controller pulls the external interrupt line until it gets notified that the
interrupt was received.

So in reality we have two events: pulling and letting go of the interrupt line.

To maintain backwards compatibility, I added a new request for the pulling
part. The letting go part was implemented earlier already.

With this in place, we can now finally start guests that do not randomly stall
and stop to work at random times.

This patch implements above logic for Book3S.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Enable napping only for Book3s_64
Alexander Graf [Tue, 17 Aug 2010 20:08:39 +0000]
KVM: PPC: Enable napping only for Book3s_64

Before I incorrectly enabled napping also for BookE, which would result in
needless dcache flushes. Since we only need to force enable napping on
Book3s_64 because it doesn't go into MSR_POW otherwise, we can just #ifdef
that code to this particular platform.

Reported-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: allow ppc440gp to pass the compatibility check
Hollis Blanchard [Sat, 7 Aug 2010 17:33:58 +0000]
KVM: PPC: allow ppc440gp to pass the compatibility check

Match only the first part of cur_cpu_spec->platform.

440GP (the first 440 processor) is identified by the string "ppc440gp", while
all later 440 processors use simply "ppc440".

Signed-off-by: Hollis Blanchard <hollis_blanchard@mentor.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: fix compilation of "dump tlbs" debug function
Hollis Blanchard [Sat, 7 Aug 2010 17:33:57 +0000]
KVM: PPC: fix compilation of "dump tlbs" debug function

Missing local variable.

Signed-off-by: Hollis Blanchard <hollis_blanchard@mentor.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: initialize IVORs in addition to IVPR
Hollis Blanchard [Sat, 7 Aug 2010 17:33:56 +0000]
KVM: PPC: initialize IVORs in addition to IVPR

Developers can now tell at a glace the exact type of the premature interrupt,
instead of just knowing that there was some premature interrupt.

Signed-off-by: Hollis Blanchard <hollis_blanchard@mentor.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Don't put MSR_POW in MSR
Alexander Graf [Sun, 15 Aug 2010 06:39:19 +0000]
KVM: PPC: Don't put MSR_POW in MSR

On Book3S a mtmsr with the MSR_POW bit set indicates that the OS is in
idle and only needs to be waked up on the next interrupt.

Now, unfortunately we let that bit slip into the stored MSR value which
is not what the real CPU does, so that we ended up executing code like
this:

r = mfmsr();
/* r containts MSR_POW */
mtmsr(r | MSR_EE);

This obviously breaks, as we're going into idle mode in code sections that
don't expect to be idling.

This patch masks MSR_POW out of the stored MSR value on wakeup, making
guests happy again.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Implement correct SID mapping on Book3s_32
Alexander Graf [Sun, 15 Aug 2010 06:04:24 +0000]
KVM: PPC: Implement correct SID mapping on Book3s_32

Up until now we were doing segment mappings wrong on Book3s_32. For Book3s_64
we were using a trick where we know that a single mmu_context gives us 16 bits
of context ids.

The mm system on Book3s_32 instead uses a clever algorithm to distribute VSIDs
across the available range, so a context id really only gives us 16 available
VSIDs.

To keep at least a few guest processes in the SID shadow, let's map a number of
contexts that we can use as VSID pool. This makes the code be actually correct
and shouldn't hurt performance too much.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Force enable nap on KVM
Alexander Graf [Tue, 17 Aug 2010 09:41:44 +0000]
KVM: PPC: Force enable nap on KVM

There are some heuristics in the PPC power management code that try to find
out if the particular hardware we're running on supports proper power management
or just hangs the machine when going into nap mode.

Since we know that KVM is safe with nap, let's force enable it in the PV code
once we're certain that we are on a KVM VM.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Make PV mtmsrd L=1 work with r30 and r31
Alexander Graf [Thu, 5 Aug 2010 13:44:41 +0000]
KVM: PPC: Make PV mtmsrd L=1 work with r30 and r31

We had an arbitrary limitation in mtmsrd L=1 that kept us from using r30 and
r31 as input registers. Let's get rid of that and get more potential speedups!

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Update int_pending also on dequeue
Alexander Graf [Thu, 5 Aug 2010 10:24:40 +0000]
KVM: PPC: Update int_pending also on dequeue

When having a decrementor interrupt pending, the dequeuing happens manually
through an mtdec instruction. This instruction simply calls dequeue on that
interrupt, so the int_pending hint doesn't get updated.

This patch enables updating the int_pending hint also on dequeue, thus
correctly enabling guests to stay in guest contexts more often.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Make PV mtmsr work with r30 and r31
Alexander Graf [Thu, 5 Aug 2010 09:26:04 +0000]
KVM: PPC: Make PV mtmsr work with r30 and r31

So far we've been restricting ourselves to r0-r29 as registers an mtmsr
instruction could use. This was bad, as there are some code paths in
Linux actually using r30.

So let's instead handle all registers gracefully and get rid of that
stupid limitation

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Add mtsrin PV code
Alexander Graf [Tue, 3 Aug 2010 08:39:35 +0000]
KVM: PPC: Add mtsrin PV code

This is the guest side of the mtsr acceleration. Using this a guest can now
call mtsrin with almost no overhead as long as it ensures that it only uses
it with (MSR_IR|MSR_DR) == 0. Linux does that, so we're good.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Put segment registers in shared page
Alexander Graf [Tue, 3 Aug 2010 00:29:27 +0000]
KVM: PPC: Put segment registers in shared page

Now that the actual mtsr doesn't do anything anymore, we can move the sr
contents over to the shared page, so a guest can directly read and write
its sr contents from guest context.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Interpret SR registers on demand
Alexander Graf [Mon, 2 Aug 2010 23:06:11 +0000]
KVM: PPC: Interpret SR registers on demand

Right now we're examining the contents of Book3s_32's segment registers when
the register is written and put the interpreted contents into a struct.

There are two reasons this is bad. For starters, the struct has worse real-time
performance, as it occupies more ram. But the more important part is that with
segment registers being interpreted from their raw values, we can put them in
the shared page, allowing guests to mess with them directly.

This patch makes the internal representation of SRs be u32s.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Move BAT handling code into spr handler
Alexander Graf [Mon, 2 Aug 2010 21:23:04 +0000]
KVM: PPC: Move BAT handling code into spr handler

The current approach duplicates the spr->bat finding logic and makes it harder
to reuse the actually used variables. So let's move everything down to the spr
handler.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Add feature bitmap for magic page
Alexander Graf [Tue, 3 Aug 2010 09:32:56 +0000]
KVM: PPC: Add feature bitmap for magic page

We will soon add SR PV support to the shared page, so we need some
infrastructure that allows the guest to query for features KVM exports.

This patch adds a second return value to the magic mapping that
indicated to the guest which features are available.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Remove unused define
Alexander Graf [Mon, 2 Aug 2010 20:05:00 +0000]
KVM: PPC: Remove unused define

The define VSID_ALL is unused. Let's remove it.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Revert "KVM: PPC: Use kernel hash function"
Alexander Graf [Mon, 2 Aug 2010 19:48:53 +0000]
KVM: PPC: Revert "KVM: PPC: Use kernel hash function"

It turns out the in-kernel hash function is sub-optimal for our subtle
hash inputs where every bit is significant. So let's revert to the original
hash functions.

This reverts commit 05340ab4f9a6626f7a2e8f9fe5397c61d494f445.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Move slb debugging to tracepoints
Alexander Graf [Mon, 2 Aug 2010 19:25:33 +0000]
KVM: PPC: Move slb debugging to tracepoints

This patch moves debugging printks for shadow SLB debugging over to tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Make invalidation code more reliable
Alexander Graf [Mon, 2 Aug 2010 19:24:48 +0000]
KVM: PPC: Make invalidation code more reliable

There is a race condition in the pte invalidation code path where we can't
be sure if a pte was invalidated already. So let's move the spin lock around
to get rid of the race.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Don't flush PTEs on NX/RO hit
Alexander Graf [Mon, 2 Aug 2010 18:11:39 +0000]
KVM: PPC: Don't flush PTEs on NX/RO hit

When hitting a no-execute or read-only data/inst storage interrupt we were
flushing the respective PTE so we're sure it gets properly overwritten next.

According to the spec, this is unnecessary though. The guest issues a tlbie
anyways, so we're safe to just keep the PTE around and have it manually removed
from the guest, saving us a flush.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Preload magic page when in kernel mode
Alexander Graf [Mon, 2 Aug 2010 14:08:22 +0000]
KVM: PPC: Preload magic page when in kernel mode

When the guest jumps into kernel mode and has the magic page mapped, theres a
very high chance that it will also use it. So let's detect that scenario and
map the segment accordingly.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Add tracepoints for generic spte flushes
Alexander Graf [Mon, 2 Aug 2010 11:40:30 +0000]
KVM: PPC: Add tracepoints for generic spte flushes

The different ways of flusing shadow ptes have their own debug prints which use
stupid old printk.

Let's move them to tracepoints, making them easier available, faster and
possible to activate on demand

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Fix sid map search after flush
Alexander Graf [Mon, 2 Aug 2010 11:38:18 +0000]
KVM: PPC: Fix sid map search after flush

After a flush the sid map contained lots of entries with 0 for their gvsid and
hvsid value. Unfortunately, 0 can be a real value the guest searches for when
looking up a vsid so it would incorrectly find the host's 0 hvsid mapping which
doesn't belong to our sid space.

So let's also check for the valid bit that indicated that the sid we're
looking at actually contains useful data.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Move pte invalidate debug code to tracepoint
Alexander Graf [Mon, 2 Aug 2010 10:55:19 +0000]
KVM: PPC: Move pte invalidate debug code to tracepoint

This patch moves the SPTE flush debug printk over to tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Add tracepoint for generic mmu map
Alexander Graf [Mon, 2 Aug 2010 10:51:07 +0000]
KVM: PPC: Add tracepoint for generic mmu map

This patch moves the generic mmu map debugging over to tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Move book3s_64 mmu map debug print to trace point
Alexander Graf [Mon, 2 Aug 2010 09:38:54 +0000]
KVM: PPC: Move book3s_64 mmu map debug print to trace point

This patch moves Book3s MMU debugging over to tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: PPC: Move EXIT_DEBUG partially to tracepoints
Alexander Graf [Mon, 2 Aug 2010 09:06:26 +0000]
KVM: PPC: Move EXIT_DEBUG partially to tracepoints

We have a debug printk on every exit that is usually #ifdef'ed out. Using
tracepoints makes a lot more sense here though, as they can be dynamically
enabled.

This patch converts the most commonly used debug printks of EXIT_DEBUG to
tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

9 years agoKVM: ia64: define kvm_lapic_enabled() to fix a compile error
Takuya Yoshikawa [Thu, 2 Sep 2010 08:55:00 +0000]
KVM: ia64: define kvm_lapic_enabled() to fix a compile error

The following patch

  commit 57ce1659316f4ca298919649f9b1b55862ac3826
  KVM: x86: In DM_LOWEST, only deliver interrupts to vcpus with enabled LAPIC's

ignored the fact that kvm_irq_delivery_to_apic() was also used by ia64.

We define kvm_lapic_enabled() to fix a compile error caused by this.
This will have the same effect as reverting the problematic patch for ia64.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: lower the aduit frequency
Xiao Guangrong [Mon, 30 Aug 2010 10:26:33 +0000]
KVM: MMU: lower the aduit frequency

The audit is very high overhead, so we need lower the frequency to assure
the guest is running.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: improve spte audit
Xiao Guangrong [Mon, 30 Aug 2010 10:25:51 +0000]
KVM: MMU: improve spte audit

Both audit_mappings() and audit_sptes_have_rmaps() need to walk vcpu's page
table, so we can do these checking in a spte walking

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: improve active sp audit
Xiao Guangrong [Mon, 30 Aug 2010 10:25:03 +0000]
KVM: MMU: improve active sp audit

Both audit_rmap() and audit_write_protection() need to walk all active sp, so
we can do these checking in a sp walking

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: move audit to a separate file
Xiao Guangrong [Mon, 30 Aug 2010 10:24:10 +0000]
KVM: MMU: move audit to a separate file

Move the audit code from arch/x86/kvm/mmu.c to arch/x86/kvm/mmu_audit.c

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: MMU: support disable/enable mmu audit dynamicly
Xiao Guangrong [Mon, 30 Aug 2010 10:22:53 +0000]
KVM: MMU: support disable/enable mmu audit dynamicly

Add a r/w module parameter named 'mmu_audit', it can control audit
enable/disable:

enable:
  echo 1 > /sys/module/kvm/parameters/mmu_audit

disable:
  echo 0 > /sys/module/kvm/parameters/mmu_audit

This patch not change the logic

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: Fix guest kernel crash on MSR_K7_CLK_CTL
Jes Sorensen [Wed, 1 Sep 2010 09:42:04 +0000]
KVM: Fix guest kernel crash on MSR_K7_CLK_CTL

MSR_K7_CLK_CTL is a no longer documented MSR, which is only relevant
on said old AMD CPU models. This change returns the expected value,
which the Linux kernel is expecting to avoid writing back the MSR,
plus it ignores all writes to the MSR.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: i8259: Make ICW1 conform to spec
Avi Kivity [Mon, 30 Aug 2010 09:18:24 +0000]
KVM: i8259: Make ICW1 conform to spec

ICW is not a full reset, instead it resets a limited number of registers
in the PIC.  Change ICW1 emulation to only reset those registers.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: x86 emulator: clean up control flow in x86_emulate_insn()
Avi Kivity [Mon, 30 Aug 2010 14:12:28 +0000]
KVM: x86 emulator: clean up control flow in x86_emulate_insn()

x86_emulate_insn() is full of things like

    if (rc != X86EMUL_CONTINUE)
        goto done;
    break;

consolidate all of those at the end of the switch statement.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: x86 emulator: fix group 11 decoding for reg != 0
Avi Kivity [Tue, 3 Aug 2010 12:05:46 +0000]
KVM: x86 emulator: fix group 11 decoding for reg != 0

These are all undefined.

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: x86 emulator: use single stage decoding for mov instructions
Avi Kivity [Tue, 3 Aug 2010 11:46:56 +0000]
KVM: x86 emulator: use single stage decoding for mov instructions

Signed-off-by: Avi Kivity <avi@redhat.com>

9 years agoKVM: Don't save/restore MSR_IA32_PERF_STATUS
Avi Kivity [Wed, 1 Sep 2010 07:23:35 +0000]
KVM: Don't save/restore MSR_IA32_PERF_STATUS

It is read/only; restoring it only results in annoying messages.

Signed-off-by: Avi Kivity <avi@redhat.com>