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| author | Paolo Bonzini <pbonzini@redhat.com> | 2024-04-04 08:13:14 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-04-11 13:08:22 -0400 |
| commit | 546d714b0880f20572d21ece5b9544c0e37a7a49 (patch) | |
| tree | 86c5504e9222e8372f3061f58d4cf09329a8fe92 /arch/x86/kvm/x86.c | |
| parent | 8d2aec3b2d7937ed77d2daa8f29c6dfc01100953 (diff) | |
| download | linux-stable-546d714b0880f20572d21ece5b9544c0e37a7a49.tar.gz linux-stable-546d714b0880f20572d21ece5b9544c0e37a7a49.tar.bz2 linux-stable-546d714b0880f20572d21ece5b9544c0e37a7a49.zip | |
KVM: introduce new vendor op for KVM_GET_DEVICE_ATTR
Allow vendor modules to provide their own attributes on /dev/kvm.
To avoid proliferation of vendor ops, implement KVM_HAS_DEVICE_ATTR
and KVM_GET_DEVICE_ATTR in terms of the same function. You're not
supposed to use KVM_GET_DEVICE_ATTR to do complicated computations,
especially on /dev/kvm.
Reviewed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Isaku Yamahata <isaku.yamahata@intel.com>
Message-ID: <20240404121327.3107131-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 38 |
1 files changed, 24 insertions, 14 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3d2029402513..3934e7682734 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4842,34 +4842,44 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) return r; } -static int kvm_x86_dev_get_attr(struct kvm_device_attr *attr) +static int __kvm_x86_dev_get_attr(struct kvm_device_attr *attr, u64 *val) { - u64 __user *uaddr = u64_to_user_ptr(attr->addr); - - if (attr->group) + if (attr->group) { + if (kvm_x86_ops.dev_get_attr) + return static_call(kvm_x86_dev_get_attr)(attr->group, attr->attr, val); return -ENXIO; + } switch (attr->attr) { case KVM_X86_XCOMP_GUEST_SUPP: - if (put_user(kvm_caps.supported_xcr0, uaddr)) - return -EFAULT; + *val = kvm_caps.supported_xcr0; return 0; default: return -ENXIO; } } +static int kvm_x86_dev_get_attr(struct kvm_device_attr *attr) +{ + u64 __user *uaddr = u64_to_user_ptr(attr->addr); + int r; + u64 val; + + r = __kvm_x86_dev_get_attr(attr, &val); + if (r < 0) + return r; + + if (put_user(val, uaddr)) + return -EFAULT; + + return 0; +} + static int kvm_x86_dev_has_attr(struct kvm_device_attr *attr) { - if (attr->group) - return -ENXIO; + u64 val; - switch (attr->attr) { - case KVM_X86_XCOMP_GUEST_SUPP: - return 0; - default: - return -ENXIO; - } + return __kvm_x86_dev_get_attr(attr, &val); } long kvm_arch_dev_ioctl(struct file *filp, |