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Subject[PATCH 12/40] KVM: Limit vcpu mmap size to one page on non-x86
Date
The second page is only needed on archs that support pio.

Noted by Carsten Otte.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---
virt/kvm/kvm_main.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 121e65c..7972e3a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1061,7 +1061,10 @@ static long kvm_dev_ioctl(struct file *filp,
r = -EINVAL;
if (arg)
goto out;
- r = 2 * PAGE_SIZE;
+ r = PAGE_SIZE; /* struct kvm_run */
+#ifdef CONFIG_X86
+ r += PAGE_SIZE; /* pio data page */
+#endif
break;
default:
return kvm_arch_dev_ioctl(filp, ioctl, arg);
--
1.5.4.5


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