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KVM: PPC: Book3S PR: Ratelimit copy data failure error messages

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kvm_ppc_mmu_book3s_32/64 xlat() logs "KVM can't copy data" error
upon failing to copy user data to kernel space. This floods kernel
log once such fails occur in short time period. Ratelimit this
error to avoid flooding kernel logs upon copy data failures.

Signed-off-by: Vipin K Parashar <vipin@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Vipin K Parashar 2017-02-16 22:40:26 +05:30 committed by Paul Mackerras
parent 5b73d6347e
commit 4da934dc65
2 changed files with 4 additions and 2 deletions
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3
arch/powerpc/kvm/book3s_32_mmu.c
View file

@ -224,7 +224,8 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
printk_ratelimited(KERN_ERR
"KVM: Can't copy data from 0x%lx!\n", ptegp);
goto no_page_found;
}

3
arch/powerpc/kvm/book3s_64_mmu.c
View file

@ -265,7 +265,8 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
goto no_page_found;
if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
printk_ratelimited(KERN_ERR
"KVM: Can't copy data from 0x%lx!\n", ptegp);
goto no_page_found;
}