target-i386: Enabling IA32_TSC_ADJUST for QEMU KVM guest VMs

CPUID.7.0.EBX[1]=1 indicates IA32_TSC_ADJUST MSR 0x3b is supported

Basic design is to emulate the MSR by allowing reads and writes to the
hypervisor vcpu specific locations to store the value of the emulated MSRs.
In this way the IA32_TSC_ADJUST value will be included in all reads to
the TSC MSR whether through rdmsr or rdtsc.

As this is a new MSR that the guest may access and modify its value needs
to be migrated along with the other MRSs. The changes here are specifically
for recognizing when IA32_TSC_ADJUST is enabled in CPUID and code added
for migrating its value.

Signed-off-by: Will Auld <will.auld@intel.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Update seabios to a810e4e72a0d42c7bc04eda57382f8e019add901

git shortlog:

Kevin O'Connor (6):
      floppy: Minor - reduce handle_0e code size when CONFIG_FLOPPY is disabled.
      vga: Minor comment spelling fix.
      Don't recursively evaluate CFLAGS variables.
      Don't use gcc's -combine option.
      Add compile checking phase to build.
      acpi: Use prt_slot() macro to describe irq pins of first PCI device.

Laszlo Ersek (1):
      maininit(): print machine UUID under seabios version message

Paolo Bonzini (1):
      acpi: reintroduce LNKS

Paolo's patch fixes the FreeBSD boot failure.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
virtio: make bindings typesafe

Move bindings from opaque to DeviceState.
This gives us better type safety with no performance cost.
Add macros to make future QOM work easier.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
qemu-kvm/pci-assign: 64 bits bar emulation

Enable 64 bits bar emulation.

Test pass with the current seabios which already support 64bit pci bars.

Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
pcie: Fix bug in pcie_ext_cap_set_next

Upper 16 bits of the PCIe Extended Capability Header was truncated during update,
also breaking pcie_add_capability.

Signed-off-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: add API to get notified about pending bit poll

Update all users.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msix: expose access to masked/pending state

For use by poll handler.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio-pci: don't poll masked vectors

At the moment, when irqfd is in use but a vector is masked,
qemu will poll it and handle vector masks in userspace.
Since almost no one ever looks at the pending bits,
it is better to defer this until pending bits
are actually read.
Implement this optimization using the new poll notifier.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Merge remote-tracking branch 'kraxel/seabios-a810e4e' into staging

* kraxel/seabios-a810e4e:
  Update seabios to a810e4e72a0d42c7bc04eda57382f8e019add901

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Merge remote-tracking branch 'mst/tags/for_anthony' into staging

pci,virtio

This optimizes MSIX handling in virtio-pci.
Also included is pci express capability bugfix.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

* mst/tags/for_anthony:
  virtio-pci: don't poll masked vectors
  msix: expose access to masked/pending state
  msi: add API to get notified about pending bit poll
  pcie: Fix bug in pcie_ext_cap_set_next
  virtio: make bindings typesafe
Merge remote-tracking branch 'qemu-kvm/uq/master' into staging

* qemu-kvm/uq/master:
  qemu-kvm/pci-assign: 64 bits bar emulation
  target-i386: Enabling IA32_TSC_ADJUST for QEMU KVM guest VMs

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
raw-posix: add raw_get_aio_fd() for virtio-blk-data-plane

The raw_get_aio_fd() function allows virtio-blk-data-plane to get the
file descriptor of a raw image file with Linux AIO enabled.  This
interface is really a layering violation that can be resolved once the
block layer is able to run outside the global mutex - at that point
virtio-blk-data-plane will switch from custom Linux AIO code to using
the block layer.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
configure: add CONFIG_VIRTIO_BLK_DATA_PLANE

The virtio-blk-data-plane feature only works with Linux AIO.  Therefore
add a ./configure option and necessary checks to implement this
dependency.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
dataplane: add host memory mapping code

The data plane thread needs to map guest physical addresses to host
pointers.  Normally this is done with cpu_physical_memory_map() but the
function assumes the global mutex is held.  The data plane thread does
not touch the global mutex and therefore needs a thread-safe memory
mapping mechanism.

Hostmem registers a MemoryListener similar to how vhost collects and
pushes memory region information into the kernel.  There is a
fine-grained lock on the regions list which is held during lookup and
when installing a new regions list.

When the physical memory map changes the MemoryListener callbacks are
invoked.  They build up a new list of memory regions which is finally
installed when the list has been completed.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
dataplane: add virtqueue vring code

The virtio-blk-data-plane cannot access memory using the usual QEMU
functions since it executes outside the global mutex and the memory APIs
are this time are not thread-safe.

This patch introduces a virtqueue module based on the kernel's vhost
vring code.  The trick is that we map guest memory ahead of time and
access it cheaply outside the global mutex.

Once the hardware emulation code can execute outside the global mutex it
will be possible to drop this code.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
dataplane: add event loop

Outside the safety of the global mutex we need to poll on file
descriptors.  I found epoll(2) is a convenient way to do that, although
other options could replace this module in the future (such as an
AioContext-based loop or glib's GMainLoop).

One important feature of this small event loop implementation is that
the loop can be terminated in a thread-safe way.  This allows QEMU to
stop the data plane thread cleanly.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
dataplane: add Linux AIO request queue

The IOQueue has a pool of iocb structs and a function to add new
read/write requests.  Multiple requests can be added before calling the
submit function to actually tell the host kernel to begin I/O.  This
allows callers to batch requests and submit them in one go.

The actual I/O is performed using Linux AIO.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
iov: add iov_discard_front/back() to remove data

The iov_discard_front/back() functions remove data from the front or
back of the vector.  This is useful when peeling off header/footer
structs.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
test-iov: add iov_discard_front/back() testcases

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
iov: add qemu_iovec_concat_iov()

The qemu_iovec_concat() function copies a subset of a QEMUIOVector.  The
new qemu_iovec_concat_iov() function does the same for a iov/cnt pair.

It is easy to define qemu_iovec_concat() in terms of
qemu_iovec_concat_iov().  The existing code is mostly unchanged, except
for the assertion src->size >= soffset, which cannot be efficiently
checked upfront on a iov/cnt pair.  Instead we assert upon hitting the
end of src with an unsatisfied soffset.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>