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| author | Christoffer Dall <c.dall@virtualopensystems.com> | 2013-01-20 18:28:09 -0500 |
|---|---|---|
| committer | Christoffer Dall <c.dall@virtualopensystems.com> | 2013-01-23 13:29:13 -0500 |
| commit | 5b3e5e5bf230f56309706dfc05fc0cb173cc83aa (patch) | |
| tree | da2ed7c2553526469c802c2a7903b1595b8be3ce /arch/arm/include/asm/kvm_coproc.h | |
| parent | f7ed45be3ba524e06a6d933f0517dc7ad2d06703 (diff) | |
| download | lwn-5b3e5e5bf230f56309706dfc05fc0cb173cc83aa.tar.gz lwn-5b3e5e5bf230f56309706dfc05fc0cb173cc83aa.zip | |
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>
Diffstat (limited to 'arch/arm/include/asm/kvm_coproc.h')
| -rw-r--r-- | arch/arm/include/asm/kvm_coproc.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_coproc.h b/arch/arm/include/asm/kvm_coproc.h index b6d023deb426..bd1ace030495 100644 --- a/arch/arm/include/asm/kvm_coproc.h +++ b/arch/arm/include/asm/kvm_coproc.h @@ -21,4 +21,18 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu); +struct kvm_coproc_target_table { + unsigned target; + const struct coproc_reg *table; + size_t num; +}; +void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table); + +int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run); +void kvm_coproc_table_init(void); #endif /* __ARM_KVM_COPROC_H__ */ |