From ea08eeccae9297f7aabd2ef7f0c2517ac4549acc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:18:26 +0000
Subject: [PATCH] write in 30M
---
kernel/drivers/xen/xlate_mmu.c | 40 +++++++++++++++++++++++++++++++++++-----
1 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/kernel/drivers/xen/xlate_mmu.c b/kernel/drivers/xen/xlate_mmu.c
index e7df65d..f17c4c0 100644
--- a/kernel/drivers/xen/xlate_mmu.c
+++ b/kernel/drivers/xen/xlate_mmu.c
@@ -93,8 +93,7 @@
info->fgfn++;
}
-static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
- void *data)
+static int remap_pte_fn(pte_t *ptep, unsigned long addr, void *data)
{
struct remap_data *info = data;
struct page *page = info->pages[info->index++];
@@ -233,7 +232,7 @@
kfree(pages);
return -ENOMEM;
}
- rc = alloc_xenballooned_pages(nr_pages, pages);
+ rc = xen_alloc_unpopulated_pages(nr_pages, pages);
if (rc) {
pr_warn("%s Couldn't balloon alloc %ld pages rc:%d\n", __func__,
nr_pages, rc);
@@ -250,7 +249,7 @@
if (!vaddr) {
pr_warn("%s Couldn't map %ld pages rc:%d\n", __func__,
nr_pages, rc);
- free_xenballooned_pages(nr_pages, pages);
+ xen_free_unpopulated_pages(nr_pages, pages);
kfree(pages);
kfree(pfns);
return -ENOMEM;
@@ -262,4 +261,35 @@
return 0;
}
-EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
+
+struct remap_pfn {
+ struct mm_struct *mm;
+ struct page **pages;
+ pgprot_t prot;
+ unsigned long i;
+};
+
+static int remap_pfn_fn(pte_t *ptep, unsigned long addr, void *data)
+{
+ struct remap_pfn *r = data;
+ struct page *page = r->pages[r->i];
+ pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), r->prot));
+
+ set_pte_at(r->mm, addr, ptep, pte);
+ r->i++;
+
+ return 0;
+}
+
+/* Used by the privcmd module, but has to be built-in on ARM */
+int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr, unsigned long len)
+{
+ struct remap_pfn r = {
+ .mm = vma->vm_mm,
+ .pages = vma->vm_private_data,
+ .prot = vma->vm_page_prot,
+ };
+
+ return apply_to_page_range(vma->vm_mm, addr, len, remap_pfn_fn, &r);
+}
+EXPORT_SYMBOL_GPL(xen_remap_vma_range);
--
Gitblit v1.6.2