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author | Alex Bennée <alex.bennee@linaro.org> | 2017-11-16 15:39:19 +0000 |
---|---|---|
committer | Christoffer Dall <christoffer.dall@linaro.org> | 2017-11-29 16:46:19 +0100 |
commit | 696673d192f52c2c5a702224ee21f005318a844b (patch) | |
tree | a7a25cf68c0197ab08ccf120b5b16c714092e8a1 /arch/arm64 | |
parent | 5553b142be11e794ebc0805950b2e8313f93d718 (diff) | |
download | linux-696673d192f52c2c5a702224ee21f005318a844b.tar.gz linux-696673d192f52c2c5a702224ee21f005318a844b.tar.bz2 linux-696673d192f52c2c5a702224ee21f005318a844b.zip |
KVM: arm/arm64: debug: Introduce helper for single-step
After emulating instructions we may want return to user-space to handle
single-step debugging. Introduce a helper function, which, if
single-step is enabled, sets the run structure for return and returns
true.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64')
-rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 1 | ||||
-rw-r--r-- | arch/arm64/kvm/debug.c | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 674912d7a571..ea6cb5b24258 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -370,6 +370,7 @@ void kvm_arm_init_debug(void); void kvm_arm_setup_debug(struct kvm_vcpu *vcpu); void kvm_arm_clear_debug(struct kvm_vcpu *vcpu); void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu); +bool kvm_arm_handle_step_debug(struct kvm_vcpu *vcpu, struct kvm_run *run); int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu, diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index dbadfaf850a7..fa63b28c65e0 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -221,3 +221,24 @@ void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) } } } + + +/* + * After successfully emulating an instruction, we might want to + * return to user space with a KVM_EXIT_DEBUG. We can only do this + * once the emulation is complete, though, so for userspace emulations + * we have to wait until we have re-entered KVM before calling this + * helper. + * + * Return true (and set exit_reason) to return to userspace or false + * if no further action is required. + */ +bool kvm_arm_handle_step_debug(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { + run->exit_reason = KVM_EXIT_DEBUG; + run->debug.arch.hsr = ESR_ELx_EC_SOFTSTP_LOW << ESR_ELx_EC_SHIFT; + return true; + } + return false; +} |