[PATCH v3 2/4] ARM64: KVM: Implement kvm_vcpu_preferred_target() function

On Thu, Sep 19, 2013 at 7:45 PM, Marc Zyngier [off-list ref] wrote:

On 19/09/13 14:11, Anup Patel wrote:

quoted

This patch implements kvm_vcpu_preferred_target() function for
KVM ARM64 which will help us implement KVM_ARM_PREFERRED_TARGET
ioctl for user space.

Signed-off-by: Anup Patel <redacted>
Signed-off-by: Pranavkumar Sawargaonkar <redacted>
---
 arch/arm/include/asm/kvm_host.h |    1 +

This hunk belongs to patch #1, and the similar hunk in #1 belongs here.

UHH, How did I miss this one !!!

Thanks for pointing.

--Anup

        M.

quoted

 arch/arm64/kvm/guest.c          |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 7d22517..76f3c19 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h

@@ -154,6 +154,7 @@ struct kvm_vcpu_stat {
 struct kvm_vcpu_init;
 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
                      const struct kvm_vcpu_init *init);
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 struct kvm_one_reg;

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index d7bf7d6..4da7882 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c

@@ -254,6 +254,27 @@ int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
      return kvm_reset_vcpu(vcpu);
 }

+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
+{
+     int target = kvm_target_cpu();
+
+     if (target < 0)
+             return -ENODEV;
+
+     memset(init, 0, sizeof(*init));
+
+     /*
+      * For now, we return all optional features are available
+      * for preferred target. In future, we might have features
+      * available based on underlying host.
+      */
+     init->target = (__u32)target;
+     init->features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
+     init->features[0] |= (1 << KVM_ARM_VCPU_EL1_32BIT);
+
+     return 0;
+}
+
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
      return -EINVAL;

--
Jazz is not dead. It just smells funny...


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