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Date: Wed, 6 May 2020 17:41:37 -0700 From: Anthony Yznaga <anthony.yznaga@...cle.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: willy@...radead.org, corbet@....net, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com, dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org, rppt@...ux.ibm.com, akpm@...ux-foundation.org, hughd@...gle.com, ebiederm@...ssion.com, masahiroy@...nel.org, ardb@...nel.org, ndesaulniers@...gle.com, dima@...ovin.in, daniel.kiper@...cle.com, nivedita@...m.mit.edu, rafael.j.wysocki@...el.com, dan.j.williams@...el.com, zhenzhong.duan@...cle.com, jroedel@...e.de, bhe@...hat.com, guro@...com, Thomas.Lendacky@....com, andriy.shevchenko@...ux.intel.com, keescook@...omium.org, hannes@...xchg.org, minchan@...nel.org, mhocko@...nel.org, ying.huang@...el.com, yang.shi@...ux.alibaba.com, gustavo@...eddedor.com, ziqian.lzq@...fin.com, vdavydov.dev@...il.com, jason.zeng@...el.com, kevin.tian@...el.com, zhiyuan.lv@...el.com, lei.l.li@...el.com, paul.c.lai@...el.com, ashok.raj@...el.com, linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org, kexec@...ts.infradead.org Subject: [RFC 11/43] PKRAM: pass the preserved pages pagetable to the next kernel Add a pointer to the pagetable to the pkram_super_block page. Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com> --- mm/pkram.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/mm/pkram.c b/mm/pkram.c index 5a7b8f61a55d..54b2779d0813 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -94,6 +94,7 @@ struct pkram_node { */ struct pkram_super_block { __u64 node_pfn; /* first element of the node list */ + __u64 pgd_pfn; }; static unsigned long pkram_sb_pfn __initdata; @@ -769,15 +770,20 @@ static void __pkram_reboot(void) struct page *page; struct pkram_node *node; unsigned long node_pfn = 0; - - list_for_each_entry_reverse(page, &pkram_nodes, lru) { - node = page_address(page); - if (WARN_ON(node->flags & PKRAM_ACCMODE_MASK)) - continue; - node->node_pfn = node_pfn; - node_pfn = page_to_pfn(page); + unsigned long pgd_pfn = 0; + + if (pkram_pgd) { + list_for_each_entry_reverse(page, &pkram_nodes, lru) { + node = page_address(page); + if (WARN_ON(node->flags & PKRAM_ACCMODE_MASK)) + continue; + node->node_pfn = node_pfn; + node_pfn = page_to_pfn(page); + } + pgd_pfn = page_to_pfn(virt_to_page(pkram_pgd)); } pkram_sb->node_pfn = node_pfn; + pkram_sb->pgd_pfn = pgd_pfn; } static int pkram_reboot(struct notifier_block *notifier, -- 2.13.3
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