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KVM: PPC: Book3S: Replace current->mm by kvm->mm 

Given that in kvm_create_vm() there is:
kvm->mm = current->mm;

And that on every kvm_*_ioctl we have:
if (kvm->mm != current->mm)
	return -EIO;

I see no reason to keep using current->mm instead of kvm->mm.

By doing so, we would reduce the use of 'global' variables on code, relying
more in the contents of kvm struct.

Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Leonardo Bras 2019-11-26 19:36:30 -03:00 committed by Paul Mackerras
parent 4de0a83554
commit 8a9c892514
3 changed files with 13 additions and 11 deletions
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4
arch/powerpc/kvm/book3s_64_mmu_hv.c
View File

@ -284,7 +284,7 @@ static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
/* Protect linux PTE lookup from page table destruction */
rcu_read_lock_sched(); /* this disables preemption too */
ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel,
current->mm->pgd, false, pte_idx_ret);
kvm->mm->pgd, false, pte_idx_ret);
rcu_read_unlock_sched();
if (ret == H_TOO_HARD) {
/* this can't happen */
@ -573,7 +573,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
is_ci = false;
pfn = 0;
page = NULL;
mm = current->mm;
mm = kvm->mm;
pte_size = PAGE_SIZE;
writing = (dsisr & DSISR_ISSTORE) != 0;
/* If writing != 0, then the HPTE must allow writing, if we get here */

10
arch/powerpc/kvm/book3s_64_vio.c
View File

@ -253,10 +253,11 @@ static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
}
}
account_locked_vm(kvm->mm,
kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
kvm_put_kvm(stt->kvm);
account_locked_vm(current->mm,
kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
call_rcu(&stt->rcu, release_spapr_tce_table);
return 0;
@ -272,6 +273,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
{
struct kvmppc_spapr_tce_table *stt = NULL;
struct kvmppc_spapr_tce_table *siter;
struct mm_struct *mm = kvm->mm;
unsigned long npages, size = args->size;
int ret = -ENOMEM;
@ -280,7 +282,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
return -EINVAL;
npages = kvmppc_tce_pages(size);
ret = account_locked_vm(current->mm, kvmppc_stt_pages(npages), true);
ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true);
if (ret)
return ret;
@ -326,7 +328,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
kfree(stt);
fail_acct:
account_locked_vm(current->mm, kvmppc_stt_pages(npages), false);
account_locked_vm(mm, kvmppc_stt_pages(npages), false);
return ret;
}

10
arch/powerpc/kvm/book3s_hv.c
View File

@ -4285,7 +4285,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
user_vrsave = mfspr(SPRN_VRSAVE);
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
vcpu->arch.pgdir = current->mm->pgd;
vcpu->arch.pgdir = kvm->mm->pgd;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
do {
@ -4640,14 +4640,14 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, hva);
down_read(&kvm->mm->mmap_sem);
vma = find_vma(kvm->mm, hva);
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
goto up_out;
psize = vma_kernel_pagesize(vma);
up_read(&current->mm->mmap_sem);
up_read(&kvm->mm->mmap_sem);
/* We can handle 4k, 64k or 16M pages in the VRMA */
if (psize >= 0x1000000)
@ -4680,7 +4680,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
return err;
up_out:
up_read(&current->mm->mmap_sem);
up_read(&kvm->mm->mmap_sem);
goto out_srcu;
}