On Tue, Apr 01, 2014 at 05:46:34PM +0800, Feng Wu wrote:
> This patch adds SMAP handling logic when setting CR4 for guests
>
> Thanks a lot to Paolo Bonzini for his suggestion to use the branchless
> way to detect SMAP violation.
>
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
>
> @@ -110,10 +118,30 @@ static inline bool is_write_protection(struct kvm_vcpu *vcpu)
> * Will a fault with a given page-fault error code (pfec) cause a permission
> * fault with the given access (in ACC_* format)?
> */
> -static inline bool permission_fault(struct kvm_mmu *mmu, unsigned pte_access,
> - unsigned pfec)
> +static inline bool permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
> + unsigned pte_access, unsigned pfec)
> {
> - return (mmu->permissions[pfec >> 1] >> pte_access) & 1;
> + int cpl = kvm_x86_ops->get_cpl(vcpu);
> + unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
Some branches added here (can't think of anything useful to avoid them).
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