From: Zhanghaoyu (A) <haoyu.zhang@huawei.com>
Date: Fri, 14 Jun 2013 07:36:13 +0000 (+0000)
Subject: KVM: x86: remove vcpu's CPL check in host-invoked XCR set
X-Git-Tag: v3.2.48~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7225ebc3c5bba27934da28579931ef46c5012411;p=pandora-kernel.git

KVM: x86: remove vcpu's CPL check in host-invoked XCR set

commit 764bcbc5a6d7a2f3e75c9f0e4caa984e2926e346 upstream.

__kvm_set_xcr function does the CPL check when set xcr. __kvm_set_xcr is
called in two flows, one is invoked by guest, call stack shown as below,

  handle_xsetbv(or xsetbv_interception)
    kvm_set_xcr
      __kvm_set_xcr

the other one is invoked by host, for example during system reset:

  kvm_arch_vcpu_ioctl
    kvm_vcpu_ioctl_x86_set_xcrs
      __kvm_set_xcr

The former does need the CPL check, but the latter does not.

Signed-off-by: Zhang Haoyu <haoyu.zhang@huawei.com>
[Tweaks to commit message. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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