From cd10b206a0bfbc857caee83f682af9ed7f45778f Mon Sep 17 00:00:00 2001 From: Zhang Xiantao Date: Sun, 3 Feb 2008 14:46:02 +0800 Subject: [PATCH] kvm: Let ioctl_get_regs suppot input pararmeters. Since kvm_regs is allocated from kernel stack, and its size is limited. In order to save large register files of some archs, this API should accept input parameters. User need to pass a user-space pointer with large memory, and kernel can copy reigster files to it. Signed-off-by: Xiantao Zhang --- virt/kvm/kvm_main.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a499f50..6d74d0b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -807,7 +807,8 @@ static long kvm_vcpu_ioctl(struct file *filp, case KVM_GET_REGS: { struct kvm_regs kvm_regs; - memset(&kvm_regs, 0, sizeof kvm_regs); + if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) + goto out; r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs); if (r) goto out; -- 1.5.2