Save the CPU endianness when the device is reset. It is widely
assumed that the guest won't change its endianness after, or at
least not without reseting the device first.
A default implementation of the endianness sampling just returns
the default "host endianness" value so that unsuspecting architectures
are not affected.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
There's no reason the array of guest specific vcpus is global. Move it into
struct kvm.
Also split up arch specific vcpu init from the generic code and call it from
the kvm_cpu initializer.
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This allows triggering NMI on guests using 'kvm debug -m [cpu]'.
Please note that the default behaviour of 'kvm debug' dumping guest's cpu
state has been modified to require a '-d'/--dump.
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch creates a new function in x86/kvm-cpu.c, kvm_cpu__handle_exit(), in
which arch-specific exit reasons can be handled outside of the common runloop.
Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Create a new arch-specific subdirectory to contain architecture-specific code
and includes.
The Makefile now adds various arch-specific objects based on detected
architecture. That aside, this patch should only contain code moves. These
include:
- x86-specific kvm_cpu setup, kernel loading, memory setup etc. now in
x86/kvm{-cpu}.c
- BIOS now lives in x86/bios/
- ioport setup
- KVM extensions are asserted in arch-specific kvm.c now, so each architecture
can manage its own dependencies.
- Various architecture-specific #defines are moved into $(ARCH)/include/kvm{-cpu}.h
such as struct kvm_cpu, KVM_NR_CPUS, KVM_32BIT_GAP_SIZE.
Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch makes debug output go to a 'debug_fd' instead of stdout.
Doing so allows us to send the output to a different console when
required.
This patch also changes the behaviour of 'kvm debug' to show the debug
output in the console that executed the debug command instead of in the
console of the guest.
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Implement the keyboard reset method which allows guest kernel
to reboot the guest using the keyboard controller.
This will allow guest kernel to reboot the guest when it needs to,
for example - kernel panic (when passing "panic=1" as kernel parameter).
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Coalescing MMIO allows us to avoid an exit every time we have a
MMIO write, instead - MMIO writes are coalesced in a ring which
can be flushed once an exit for a different reason is needed.
A MMIO exit is also trigged once the ring is full.
Coalesce all MMIO regions registered in the MMIO mapper.
Add a coalescing handler under kvm_cpu.
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Allow pausing and unpausing guests running on the host.
Pausing a guest means that none of the VCPU threads are running
KVM_RUN until they are unpaused.
The following API functions are added:
void kvm__pause(void);
void kvm__continue(void);
void kvm__notify_paused(void);
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Currently the VCPU loop would exit when the thread received any signal.
Change behaviour to exit only when SIGKVMEXIT is received. This change
prevents from the guest to terminate when unrelated signals are processed
by the thread (for example, when attaching a debugger).
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch makes the core hypervisor to use per-VCPU threads for execution.
NOTE: We only start one thread right now because we're unable to let the guest
kernel know about more cores at the moment.
Cc: Asias He <asias.hejun@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Tested-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Marc Zyngier