linux-toradex.git/include/linux/kvm.h, branch v2.6.22.13

KVM: Remove unused 'instruction_length'

2007-05-03T07:52:32+00:00

As we no longer emulate in userspace, this is meaningless.  We don't
compute it on SVM anyway.

Signed-off-by: Avi Kivity

KVM: Don't require explicit indication of completion of mmio or pio

2007-05-03T07:52:32+00:00

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

KVM: Add fpu get/set operations

2007-05-03T07:52:28+00:00

These are really helpful when migrating an floating point app to another
machine.

Signed-off-by: Avi Kivity

KVM: Add physical memory aliasing feature

2007-05-03T07:52:28+00:00

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

KVM: Avoid guest virtual addresses in string pio userspace interface

2007-05-03T07:52:25+00:00

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

KVM: Allow kernel to select size of mmap() buffer

2007-05-03T07:52:24+00:00

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

KVM: Add guest mode signal mask

2007-05-03T07:52:24+00:00

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

KVM: Add a special exit reason when exiting due to an interrupt

2007-05-03T07:52:24+00:00

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

KVM: Fold kvm_run::exit_type into kvm_run::exit_reason

2007-05-03T07:52:24+00:00

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

KVM: Allow userspace to process hypercalls which have no kernel handler

2007-05-03T07:52:24+00:00

This is useful for paravirtualized graphics devices, for example.

Signed-off-by: Avi Kivity