Commit 20bbea2d authored by yangdepei's avatar yangdepei
Browse files

hct: fix fork issue when use hct in virtual machine 

hygon inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I99ZNA



--------------------------------

fix fork process in virtual env will cause stuck due to inherrit parent
wb info
Fixes: bd4bd8459fe2 ("hct: supporting memory encryption in host and wb set in vm")

Signed-off-by: default avatarYabin Li <liyabin@hygon.cn>
Signed-off-by: default avataryangdepei <yangdepei@hygon.cn>
parent 412ab21b

drivers/crypto/ccp/hygon/hct.c

+15 −1
Original line number Diff line number Diff line
@@ -2085,10 +2085,23 @@ static void hct_device_release(struct device *dev) 
}

#endif /* IS_ENABLED(CONFIG_VFIO_MDEV) */



static void _pfn_vm_pat_flags_moved(unsigned long addr)

{

	struct vm_area_struct *vma = find_vma(current->mm, addr);



	if (!vma) {

		pr_err("vma is NULL.\n");

		return;

	}



	if (vma->vm_flags & VM_PFNMAP)

		vm_flags_clear(vma, VM_PAT);

}



/* set the flags PAT, PCT and PWT of page all to 0

 * for obtaining cache properties.

 */

void hct_noiommu_set_memory_wb(unsigned long address)

static void hct_noiommu_set_memory_wb(unsigned long address)

{

	pgd_t *pgd = current->mm->pgd + pgd_index(address);

	p4d_t *p4d;
@@ -2135,6 +2148,7 @@ void hct_noiommu_set_memory_wb(unsigned long address) 
	pgprot_val(new_prot) &= ~(_PAGE_PAT | _PAGE_PCD | _PAGE_PWT);

	new_pte = pfn_pte(pfn, new_prot);

	set_pte_atomic(pte, new_pte);

	_pfn_vm_pat_flags_moved(address);

}



static DEFINE_MUTEX(hct_noiommu_lock);