linux-kernel - [PATCH 12/40] KVM: Limit vcpu mmap size to one page on non-x86

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Date:	Mon, 31 Mar 2008 17:36:56 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 12/40] KVM: Limit vcpu mmap size to one page on non-x86

The second page is only needed on archs that support pio.

Noted by Carsten Otte.

Signed-off-by: Avi Kivity <avi@...ranet.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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