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| author | Alex Bennée <alex.bennee@linaro.org> | 2015-07-07 16:29:57 (GMT) |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-07-21 11:47:08 (GMT) |
| commit | 4bd611ca60afa155bca25b40312ed61c4d46237f (patch) | |
| tree | f90c63e79179c6ce52a2dee5f7e05a14e7d9ce62 /arch/arm64/kvm/guest.c | |
| parent | 56c7f5e77f797fd0dcf2376ce1496f4238e6be33 (diff) | |
| download | linux-4bd611ca60afa155bca25b40312ed61c4d46237f.tar.xz | |
KVM: arm64: guest debug, add SW break point support
This adds support for SW breakpoints inserted by userspace.
We do this by trapping all guest software debug exceptions to the
hypervisor (MDCR_EL2.TDE). The exit handler sets an exit reason of
KVM_EXIT_DEBUG with the kvm_debug_exit_arch structure holding the
exception syndrome information.
It will be up to userspace to extract the PC (via GET_ONE_REG) and
determine if the debug event was for a breakpoint it inserted. If not
userspace will need to re-inject the correct exception restart the
hypervisor to deliver the debug exception to the guest.
Any other guest software debug exception (e.g. single step or HW
assisted breakpoints) will cause an error and the VM to be killed. This
is addressed by later patches which add support for the other debug
types.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kvm/guest.c')
| -rw-r--r-- | arch/arm64/kvm/guest.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 0ba8677..22d22c5 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -332,7 +332,7 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, return -EINVAL; } -#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE) +#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP) /** * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging |