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KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl 

This commit adds a stub function to support the KVM_SET_GUEST_DEBUG
ioctl. Any unsupported flag will return -EINVAL. For now, only
KVM_GUESTDBG_ENABLE is supported, although it won't have any effects.

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>
hifive-unleashed-5.1
Alex Bennée 2015-07-07 17:29:55 +01:00 committed by Marc Zyngier
parent 21b6f32f94
commit 0e6f07f29c
4 changed files with 34 additions and 8 deletions
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2
Documentation/virtual/kvm/api.txt
View File

@ -2671,7 +2671,7 @@ handled.
4.87 KVM_SET_GUEST_DEBUG
Capability: KVM_CAP_SET_GUEST_DEBUG
Architectures: x86, s390, ppc
Architectures: x86, s390, ppc, arm64
Type: vcpu ioctl
Parameters: struct kvm_guest_debug (in)
Returns: 0 on success; -1 on error

7
arch/arm/kvm/arm.c
View File

@ -301,13 +301,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
kvm_arm_set_running_vcpu(NULL);
}
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{

6
arch/arm/kvm/guest.c
View File

@ -290,3 +290,9 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
return -EINVAL;
}

27
arch/arm64/kvm/guest.c
View File

@ -331,3 +331,30 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
{
return -EINVAL;
}
#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE)
/**
* kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
* @kvm: pointer to the KVM struct
* @kvm_guest_debug: the ioctl data buffer
*
* This sets up and enables the VM for guest debugging. Userspace
* passes in a control flag to enable different debug types and
* potentially other architecture specific information in the rest of
* the structure.
*/
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
return -EINVAL;
if (dbg->control & KVM_GUESTDBG_ENABLE) {
vcpu->guest_debug = dbg->control;
} else {
/* If not enabled clear all flags */
vcpu->guest_debug = 0;
}
return 0;
}