Commit graph

54 commits

Author SHA1 Message Date
Christian Ehrhardt
6f723c7911 KVM: Portability: Move kvm_fpu to asm-x86/kvm.h
This patch moves kvm_fpu asm-x86/kvm.h to allow every architecture to
define an own representation used for KVM_GET_FPU/KVM_SET_FPU.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Acked-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 18:01:22 +02:00
Avi Kivity
b93463aa59 KVM: Accelerated apic support
This adds a mechanism for exposing the virtual apic tpr to the guest, and a
protocol for letting the guest update the tpr without causing a vmexit if
conditions allow (e.g. there is no interrupt pending with a higher priority
than the new tpr).

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 18:01:20 +02:00
Avi Kivity
b209749f52 KVM: local APIC TPR access reporting facility
Add a facility to report on accesses to the local apic tpr even if the
local apic is emulated in the kernel.  This is basically a hack that
allows userspace to patch Windows which tends to bang on the tpr a lot.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 18:01:20 +02:00
Zhang Xiantao
ec10f4750d KVM: Expose ioapic to ia64 save/restore APIs
IA64 also needs to see ioapic structure in irqchip.

Signed-off-by: xiantao.zhang@intel.com <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 18:01:19 +02:00
Jerone Young
51e296258c KVM: Add ifdef in irqchip struct for x86 only structures
This patch fixes a small issue where sturctures:
	kvm_pic_state
	kvm_ioapic_state

are defined inside x86 specific code and may or may not
be defined in anyway for other architectures. The problem
caused is one cannot compile userspace apps (ex. libkvm)
for other archs since a size cannot be determined for these
structures.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:15 +02:00
Dan Kenigsberg
0771671749 KVM: Enhance guest cpuid management
The current cpuid management suffers from several problems, which inhibit
passing through the host feature set to the guest:

 - No way to tell which features the host supports

  While some features can be supported with no changes to kvm, others
  need explicit support.  That means kvm needs to vet the feature set
  before it is passed to the guest.

 - No support for indexed or stateful cpuid entries

  Some cpuid entries depend on ecx as well as on eax, or on internal
  state in the processor (running cpuid multiple times with the same
  input returns different output).  The current cpuid machinery only
  supports keying on eax.

 - No support for save/restore/migrate

  The internal state above needs to be exposed to userspace so it can
  be saved or migrated.

This patch adds extended cpuid support by means of three new ioctls:

 - KVM_GET_SUPPORTED_CPUID: get all cpuid entries the host (and kvm)
   supports

 - KVM_SET_CPUID2: sets the vcpu's cpuid table

 - KVM_GET_CPUID2: gets the vcpu's cpuid table, including hidden state

[avi: fix original KVM_SET_CPUID not removing nx on non-nx hosts as it did
      before]

Signed-off-by: Dan Kenigsberg <danken@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:13 +02:00
Jerone Young
a162dd5873 KVM: Portability: Move cpuid structures to <asm/kvm.h>
This patch moves structures:
	kvm_cpuid_entry
	kvm_cpuid

from include/linux/kvm.h to include/asm-x86/kvm.h

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:08 +02:00
Jerone Young
244d57ece9 KVM: Portability: Move kvm_sregs and msr structures to <asm/kvm.h>
Move structures:
	kvm_sregs
	kvm_msr_entry
	kvm_msrs
	kvm_msr_list

from include/linux/kvm.h to include/asm-x86/kvm.h

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:08 +02:00
Jerone Young
3a56b20104 KVM: Portability: Move kvm_segment & kvm_dtable structure to <asm/kvm.h>
This patch moves structures:
	kvm_segment
	kvm_dtable
from include/linux/kvm.h to include/asm-x86/kvm.h

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:08 +02:00
Jerone Young
d9ecf92810 KVM: Portability: Move structure lapic_state to <asm/kvm.h>
This patch moves structure lapic_state from include/linux/kvm.h
to include/asm-x86/kvm.h

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:08 +02:00
Jerone Young
19d30b1644 KVM: Portability: Move kvm_regs to <asm/kvm.h>
This patch moves structure kvm_regs to include/asm-x86/kvm.h.
Each architecture will need to create there own version of this
structure.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:07 +02:00
Jerone Young
da1386a5bc KVM: Portability: Move x86 pic strutctures
This patch moves structures:
	kvm_pic_state
	kvm_ioapic_state

to inclue/asm-x86/kvm.h.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:07 +02:00
Jerone Young
f6a40e3bdf KVM: Portability: Move kvm_memory_alias to asm/kvm.h
This patch moves sturct kvm_memory_alias from include/linux/kvm.h
to include/asm-x86/kvm.h. Also have include/linux/kvm.h include
include/asm/kvm.h.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:53:07 +02:00
Izik Eidus
cbc9402297 KVM: Add ioctl to tss address from userspace,
Currently kvm has a wart in that it requires three extra pages for use
as a tss when emulating real mode on Intel.  This patch moves the allocation
internally, only requiring userspace to tell us where in the physical address
space we can place the tss.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:56 +02:00
Izik Eidus
6fc138d227 KVM: Support assigning userspace memory to the guest
Instead of having the kernel allocate memory to the guest, let userspace
allocate it and pass the address to the kernel.

This is required for s390 support, but also enables features like memory
sharing and using hugetlbfs backed memory.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:51 +02:00
Izik Eidus
82ce2c9683 KVM: Allow dynamic allocation of the mmu shadow cache size
The user is now able to set how many mmu pages will be allocated to the guest.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:50 +02:00
Avi Kivity
8a45450d0a KVM: Replace enum by #define
Easier for existence test (#ifdef) in userspace.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:29 +02:00
Eddie Dong
96ad2cc613 KVM: in-kernel LAPIC save and restore support
This patch adds a new vcpu-based IOCTL to save and restore the local
apic registers for a single vcpu. The kernel only copies the apic page as
a whole, extraction of registers is left to userspace side. On restore, the
APIC timer is restarted from the initial count, this introduces a little
delay, but works fine.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:25 +02:00
He, Qing
6bf9e962d1 KVM: in-kernel IOAPIC save and restore support
This patch adds support for in-kernel ioapic save and restore (to
and from userspace). It uses the same get/set_irqchip ioctl as
in-kernel PIC.

Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:25 +02:00
He, Qing
6ceb9d791e KVM: Add get/set irqchip ioctls for in-kernel PIC live migration support
This patch adds two new ioctls to dump and write kernel irqchips for
save/restore and live migration. PIC s/r and l/m is implemented in this
patch.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:25 +02:00
Eddie Dong
b6958ce44a KVM: Emulate hlt in the kernel
By sleeping in the kernel when hlt is executed, we simplify the in-kernel
guest interrupt path considerably.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:25 +02:00
Eddie Dong
97222cc831 KVM: Emulate local APIC in kernel
Because lightweight exits (exits which don't involve userspace) are many
times faster than heavyweight exits, it makes sense to emulate high usage
devices in the kernel.  The local APIC is one such device, especially for
Windows and for SMP, so we add an APIC model to kvm.

It also allows in-kernel host-side drivers to inject interrupts without
going through userspace.

[compile fix on i386 from Jindrich Makovicka]

Signed-off-by: Yaozu (Eddie) Dong <Eddie.Dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:25 +02:00
Eddie Dong
85f455f7dd KVM: Add support for in-kernel PIC emulation
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:24 +02:00
Yang, Sheng
253abdee5e KVM: Communicate cr8 changes to userspace
This allows running 64-bit Windows.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:23 +02:00
Jeff Dike
519ef35341 KVM: add hypercall nr to kvm_run
Add the hypercall number to kvm_run and initialize it.  This changes the ABI,
but as this particular ABI was unusable before this no users are affected.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:20 +02:00
Rusty Russell
9eb829ced8 KVM: Trivial: Use standard BITMAP macros, open-code userspace-exposed header
Creating one's own BITMAP macro seems suboptimal: if we use manual
arithmetic in the one place exposed to userspace, we can use standard
macros elsewhere.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:18 +02:00
Rusty Russell
dea8caee7b KVM: Trivial: /dev/kvm interface is no longer experimental.
KVM interface is no longer experimental.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:17 +02:00
Avi Kivity
24cbc7e9cb KVM: Future-proof the exit information union ABI
Note that as the size of struct kvm_run is not part of the ABI, we can add
things at the end.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13 10:18:17 +02:00
Avi Kivity
2ff81f70b5 KVM: Remove unused 'instruction_length'
As we no longer emulate in userspace, this is meaningless.  We don't
compute it on SVM anyway.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:32 +03:00
Avi Kivity
02c8320972 KVM: Don't require explicit indication of completion of mmio or pio
It is illegal not to return from a pio or mmio request without completing
it, as mmio or pio is an atomic operation.  Therefore, we can simplify
the userspace interface by avoiding the completion indication.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:32 +03:00
Avi Kivity
b8836737d9 KVM: Add fpu get/set operations
These are really helpful when migrating an floating point app to another
machine.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:28 +03:00
Avi Kivity
e8207547d2 KVM: Add physical memory aliasing feature
With this, we can specify that accesses to one physical memory range will
be remapped to another.  This is useful for the vga window at 0xa0000 which
is used as a movable window into the (much larger) framebuffer.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:28 +03:00
Avi Kivity
039576c03c KVM: Avoid guest virtual addresses in string pio userspace interface
The current string pio interface communicates using guest virtual addresses,
relying on userspace to translate addresses and to check permissions.  This
interface cannot fully support guest smp, as the check needs to take into
account two pages at one in case an unaligned string transfer straddles a
page boundary.

Change the interface not to communicate guest addresses at all; instead use
a buffer page (mmaped by userspace) and do transfers there.  The kernel
manages the virtual to physical translation and can perform the checks
atomically by taking the appropriate locks.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:25 +03:00
Avi Kivity
07c45a366d KVM: Allow kernel to select size of mmap() buffer
This allows us to store offsets in the kernel/user kvm_run area, and be
sure that userspace has them mapped.  As offsets can be outside the
kvm_run struct, userspace has no way of knowing how much to mmap.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
1961d276c8 KVM: Add guest mode signal mask
Allow a special signal mask to be used while executing in guest mode.  This
allows signals to be used to interrupt a vcpu without requiring signal
delivery to a userspace handler, which is quite expensive.  Userspace still
receives -EINTR and can get the signal via sigwait().

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
1b19f3e61d KVM: Add a special exit reason when exiting due to an interrupt
This is redundant, as we also return -EINTR from the ioctl, but it
allows us to examine the exit_reason field on resume without seeing
old data.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
8eb7d334bd KVM: Fold kvm_run::exit_type into kvm_run::exit_reason
Currently, userspace is told about the nature of the last exit from the
guest using two fields, exit_type and exit_reason, where exit_type has
just two enumerations (and no need for more).  So fold exit_type into
exit_reason, reducing the complexity of determining what really happened.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
b4e63f560b KVM: Allow userspace to process hypercalls which have no kernel handler
This is useful for paravirtualized graphics devices, for example.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
5d308f4550 KVM: Add method to check for backwards-compatible API extensions
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:24 +03:00
Avi Kivity
739872c56f KVM: Renumber ioctls
The recent changes have left the ioctl numbers in complete disarray.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
2a4dac3952 KVM: Remove minor wart from KVM_CREATE_VCPU ioctl
That ioctl does not transfer any data, so it should be an _IO rather than an
_IOW.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
106b552b43 KVM: Remove the 'emulated' field from the userspace interface
We no longer emulate single instructions in userspace.  Instead, we service
mmio or pio requests.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
06465c5a3a KVM: Handle cpuid in the kernel instead of punting to userspace
KVM used to handle cpuid by letting userspace decide what values to
return to the guest.  We now handle cpuid completely in the kernel.  We
still let userspace decide which values the guest will see by having
userspace set up the value table beforehand (this is necessary to allow
management software to set the cpu features to the least common denominator,
so that live migration can work).

The motivation for the change is that kvm kernel code can be impacted by
cpuid features, for example the x86 emulator.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
46fc147788 KVM: Do not communicate to userspace through cpu registers during PIO
Currently when passing the a PIO emulation request to userspace, we
rely on userspace updating %rax (on 'in' instructions) and %rsi/%rdi/%rcx
(on string instructions).  This (a) requires two extra ioctls for getting
and setting the registers and (b) is unfriendly to non-x86 archs, when
they get kvm ports.

So fix by doing the register fixups in the kernel and passing to userspace
only an abstract description of the PIO to be done.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
9a2bb7f486 KVM: Use a shared page for kernel/user communication when runing a vcpu
Instead of passing a 'struct kvm_run' back and forth between the kernel and
userspace, allocate a page and allow the user to mmap() it.  This reduces
needless copying and makes the interface expandable by providing lots of
free space.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:23 +03:00
Avi Kivity
f7e6a45ad9 KVM: Bump API version
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-03-04 11:12:42 +02:00
Avi Kivity
bccf2150fe KVM: Per-vcpu inodes
Allocate a distinct inode for every vcpu in a VM.  This has the following
benefits:

 - the filp cachelines are no longer bounced when f_count is incremented on
   every ioctl()
 - the API and internal code are distinctly clearer; for example, on the
   KVM_GET_REGS ioctl, there is no need to copy the vcpu number from
   userspace and then copy the registers back; the vcpu identity is derived
   from the fd used to make the call

Right now the performance benefits are completely theoretical since (a) we
don't support more than one vcpu per VM and (b) virtualization hardware
inefficiencies completely everwhelm any cacheline bouncing effects.  But
both of these will change, and we need to prepare the API today.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-03-04 11:12:42 +02:00
Avi Kivity
f17abe9a44 KVM: Create an inode per virtual machine
This avoids having filp->f_op and the corresponding inode->i_fop different,
which is a little unorthodox.

The ioctl list is split into two: global kvm ioctls and per-vm ioctls.  A new
ioctl, KVM_CREATE_VM, is used to create VMs and return the VM fd.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-03-04 11:12:42 +02:00
Avi Kivity
8cd133073f [PATCH] kvm: Fix mismatch between 32-bit and 64-bit abi
Unfortunately requiring a version bump.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:40 -08:00
Dor Laor
54810342f1 [PATCH] kvm: Two-way apic tpr synchronization
We report the value of cr8 to userspace on an exit.  Also let userspace change
cr8 when we re-enter the guest.  The lets 64-bit guest code maintain the tpr
correctly.

Thanks for Yaniv Kamay for the idea.

Signed-off-by: Dor Laor <dor.laor@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:40 -08:00