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authorAvi Kivity <avi@qumranet.com>2007-03-07 13:05:38 +0200
committerAvi Kivity <avi@qumranet.com>2007-05-03 10:52:24 +0300
commit07c45a366d89f8eaec5d9890e810171b408f9a52 (patch)
tree2f54f8c4ba795a1432ee6ac2e8042a472b87550a /drivers/kvm/kvm_main.c
parent1961d276c877b99f5f16aaf36377c75e0e191c3a (diff)
KVM: Allow kernel to select size of mmap() buffer
This allows us to store offsets in the kernel/user kvm_run area, and be sure that userspace has them mapped. As offsets can be outside the kvm_run struct, userspace has no way of knowing how much to mmap. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/kvm_main.c')
-rw-r--r--drivers/kvm/kvm_main.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index df85f5f6548..cba0b87c34e 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2436,7 +2436,7 @@ static long kvm_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
- int r = -EINVAL;
+ long r = -EINVAL;
switch (ioctl) {
case KVM_GET_API_VERSION:
@@ -2478,6 +2478,12 @@ static long kvm_dev_ioctl(struct file *filp,
*/
r = 0;
break;
+ case KVM_GET_VCPU_MMAP_SIZE:
+ r = -EINVAL;
+ if (arg)
+ goto out;
+ r = PAGE_SIZE;
+ break;
default:
;
}