KVM: ARM: Emulation framework and CP15 emulation
authorChristoffer Dall <c.dall@virtualopensystems.com>
Sun, 20 Jan 2013 23:28:09 +0000 (18:28 -0500)
committerChristoffer Dall <c.dall@virtualopensystems.com>
Wed, 23 Jan 2013 18:29:13 +0000 (13:29 -0500)
commit5b3e5e5bf230f56309706dfc05fc0cb173cc83aa
treeda2ed7c2553526469c802c2a7903b1595b8be3ce
parentf7ed45be3ba524e06a6d933f0517dc7ad2d06703
KVM: ARM: Emulation framework and CP15 emulation

Adds a new important function in the main KVM/ARM code called
handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns
from guest execution. This function examines the Hyp-Syndrome-Register
(HSR), which contains information telling KVM what caused the exit from
the guest.

Some of the reasons for an exit are CP15 accesses, which are
not allowed from the guest and this commit handles these exits by
emulating the intended operation in software and skipping the guest
instruction.

Minor notes about the coproc register reset:
1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our
   table, at cost of 4 bytes per vcpu.

2) Added comments on the table indicating how we handle each register, for
   simplicity of understanding.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
arch/arm/include/asm/kvm_arm.h
arch/arm/include/asm/kvm_coproc.h
arch/arm/include/asm/kvm_emulate.h
arch/arm/include/asm/kvm_host.h
arch/arm/kvm/Makefile
arch/arm/kvm/arm.c
arch/arm/kvm/coproc.c
arch/arm/kvm/coproc.h [new file with mode: 0644]
arch/arm/kvm/coproc_a15.c [new file with mode: 0644]
arch/arm/kvm/emulate.c
arch/arm/kvm/trace.h