Messages in this thread Patch in this message | | | From | Paolo Bonzini <> | Subject | [PATCH 1/5] KVM: x86: support KVM_ENABLE_CAP on vm file descriptors | Date | Tue, 13 May 2014 16:55:37 +0200 |
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We will use it for CPL save/restore; making it an enabled capability lets us reuse a padding field in kvm_segment instead of inventing a new ioctl. This is also simpler because KVM_SET_SREGS already mucks with the CPL.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- arch/x86/kvm/x86.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9e8c74e6a4c1..8e0532fc4d96 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2655,6 +2655,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_READONLY_MEM: case KVM_CAP_HYPERV_TIME: case KVM_CAP_IOAPIC_POLARITY_IGNORED: + case KVM_CAP_ENABLE_CAP_VM: #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT case KVM_CAP_ASSIGN_DEV_IRQ: case KVM_CAP_PCI_2_3: @@ -3673,6 +3674,21 @@ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, return 0; } +static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) +{ + int r; + + if (cap->flags) + return -EINVAL; + + switch (cap->cap) { + default: + r = -EINVAL; + break; + } + return r; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -3709,6 +3725,14 @@ long kvm_arch_vm_ioctl(struct file *filp, case KVM_GET_NR_MMU_PAGES: r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); break; + case KVM_ENABLE_CAP: { + struct kvm_enable_cap cap; + r = -EFAULT; + if (copy_from_user(&cap, argp, sizeof(cap))) + break; + r = kvm_vm_ioctl_enable_cap(kvm, &cap); + break; + } case KVM_CREATE_IRQCHIP: { struct kvm_pic *vpic; -- 1.8.3.1
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