From: Alexandre Chartre <alexandre.chartre@oracle.com>
To: pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, kvm@vger.kernel.org, x86@kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: konrad.wilk@oracle.com, jan.setjeeilers@oracle.com,
liran.alon@oracle.com, jwadams@google.com, graf@amazon.de,
rppt@linux.vnet.ibm.com, alexandre.chartre@oracle.com
Subject: [RFC v2 06/26] mm/asi: Add ASI page-table entry allocation functions
Date: Thu, 11 Jul 2019 16:25:18 +0200 [thread overview]
Message-ID: <1562855138-19507-7-git-send-email-alexandre.chartre@oracle.com> (raw)
In-Reply-To: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com>
Add functions to allocate p4d/pud/pmd/pte pages for an ASI page-table
and keep track of them.
Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
---
arch/x86/mm/asi_pagetable.c | 111 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 111 insertions(+), 0 deletions(-)
diff --git a/arch/x86/mm/asi_pagetable.c b/arch/x86/mm/asi_pagetable.c
index a89e02e..0fc6d59 100644
--- a/arch/x86/mm/asi_pagetable.c
+++ b/arch/x86/mm/asi_pagetable.c
@@ -4,6 +4,8 @@
*
*/
+#include <linux/mm.h>
+
#include <asm/asi.h>
/*
@@ -159,3 +161,112 @@ static bool asi_valid_offset(struct asi *asi, void *offset)
return p4d;
}
+
+/*
+ * asi_pXX_alloc() functions are equivalent to kernel pXX_alloc() functions
+ * but, in addition, they keep track of new pages allocated for the specified
+ * ASI.
+ */
+
+static pte_t *asi_pte_alloc(struct asi *asi, pmd_t *pmd, unsigned long addr)
+{
+ struct page *page;
+ pte_t *pte;
+ int err;
+
+ if (pmd_none(*pmd)) {
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ pte = (pte_t *)page_address(page);
+ err = asi_add_backend_page(asi, pte, PGT_LEVEL_PTE);
+ if (err) {
+ free_page((unsigned long)pte);
+ return ERR_PTR(err);
+ }
+ set_pmd_safe(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
+ pte = pte_offset_map(pmd, addr);
+ } else {
+ pte = asi_pte_offset(asi, pmd, addr);
+ }
+
+ return pte;
+}
+
+static pmd_t *asi_pmd_alloc(struct asi *asi, pud_t *pud, unsigned long addr)
+{
+ struct page *page;
+ pmd_t *pmd;
+ int err;
+
+ if (pud_none(*pud)) {
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ pmd = (pmd_t *)page_address(page);
+ err = asi_add_backend_page(asi, pmd, PGT_LEVEL_PMD);
+ if (err) {
+ free_page((unsigned long)pmd);
+ return ERR_PTR(err);
+ }
+ set_pud_safe(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
+ pmd = pmd_offset(pud, addr);
+ } else {
+ pmd = asi_pmd_offset(asi, pud, addr);
+ }
+
+ return pmd;
+}
+
+static pud_t *asi_pud_alloc(struct asi *asi, p4d_t *p4d, unsigned long addr)
+{
+ struct page *page;
+ pud_t *pud;
+ int err;
+
+ if (p4d_none(*p4d)) {
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ pud = (pud_t *)page_address(page);
+ err = asi_add_backend_page(asi, pud, PGT_LEVEL_PUD);
+ if (err) {
+ free_page((unsigned long)pud);
+ return ERR_PTR(err);
+ }
+ set_p4d_safe(p4d, __p4d(__pa(pud) | _KERNPG_TABLE));
+ pud = pud_offset(p4d, addr);
+ } else {
+ pud = asi_pud_offset(asi, p4d, addr);
+ }
+
+ return pud;
+}
+
+static p4d_t *asi_p4d_alloc(struct asi *asi, pgd_t *pgd, unsigned long addr)
+{
+ struct page *page;
+ p4d_t *p4d;
+ int err;
+
+ if (!pgtable_l5_enabled())
+ return (p4d_t *)pgd;
+
+ if (pgd_none(*pgd)) {
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ p4d = (p4d_t *)page_address(page);
+ err = asi_add_backend_page(asi, p4d, PGT_LEVEL_P4D);
+ if (err) {
+ free_page((unsigned long)p4d);
+ return ERR_PTR(err);
+ }
+ set_pgd_safe(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE));
+ p4d = p4d_offset(pgd, addr);
+ } else {
+ p4d = asi_p4d_offset(asi, pgd, addr);
+ }
+
+ return p4d;
+}
--
1.7.1
next prev parent reply other threads:[~2019-07-11 14:26 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-11 14:25 [RFC v2 00/27] Kernel Address Space Isolation Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 01/26] mm/x86: Introduce kernel address space isolation Alexandre Chartre
2019-07-11 21:33 ` Thomas Gleixner
2019-07-12 7:43 ` Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 02/26] mm/asi: Abort isolation on interrupt, exception and context switch Alexandre Chartre
2019-07-11 20:11 ` Andi Kleen
2019-07-11 20:17 ` Mike Rapoport
2019-07-11 20:41 ` Alexandre Chartre
2019-07-12 0:05 ` Andy Lutomirski
2019-07-12 7:50 ` Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 03/26] mm/asi: Handle page fault due to address space isolation Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 04/26] mm/asi: Functions to track buffers allocated for an ASI page-table Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 05/26] mm/asi: Add ASI page-table entry offset functions Alexandre Chartre
2019-07-11 14:25 ` Alexandre Chartre [this message]
2019-07-11 14:25 ` [RFC v2 07/26] mm/asi: Add ASI page-table entry set functions Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 08/26] mm/asi: Functions to populate an ASI page-table from a VA range Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 09/26] mm/asi: Helper functions to map module into ASI Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 10/26] mm/asi: Keep track of VA ranges mapped in ASI page-table Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 11/26] mm/asi: Functions to clear ASI page-table entries for a VA range Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 12/26] mm/asi: Function to copy page-table entries for percpu buffer Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 13/26] mm/asi: Add asi_remap() function Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 14/26] mm/asi: Handle ASI mapped range leaks and overlaps Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 15/26] mm/asi: Initialize the ASI page-table with core mappings Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 16/26] mm/asi: Option to map current task into ASI Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 17/26] rcu: Move tree.h static forward declarations to tree.c Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 18/26] rcu: Make percpu rcu_data non-static Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 19/26] mm/asi: Add option to map RCU data Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 20/26] mm/asi: Add option to map cpu_hw_events Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 21/26] mm/asi: Make functions to read cr3/cr4 ASI aware Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 22/26] KVM: x86/asi: Introduce address_space_isolation module parameter Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 23/26] KVM: x86/asi: Introduce KVM address space isolation Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 24/26] KVM: x86/asi: Populate the KVM ASI page-table Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 25/26] KVM: x86/asi: Switch to KVM address space on entry to guest Alexandre Chartre
2019-07-11 14:25 ` [RFC v2 26/26] KVM: x86/asi: Map KVM memslots and IO buses into KVM ASI Alexandre Chartre
2019-07-11 14:40 ` [RFC v2 00/27] Kernel Address Space Isolation Alexandre Chartre
2019-07-11 22:38 ` Dave Hansen
2019-07-12 8:09 ` Alexandre Chartre
2019-07-12 13:51 ` Dave Hansen
2019-07-12 14:06 ` Alexandre Chartre
2019-07-12 15:23 ` Thomas Gleixner
2019-07-12 10:44 ` Thomas Gleixner
2019-07-12 11:56 ` Alexandre Chartre
2019-07-12 12:50 ` Peter Zijlstra
2019-07-12 13:43 ` Alexandre Chartre
2019-07-12 13:58 ` Dave Hansen
2019-07-12 14:36 ` Andy Lutomirski
2019-07-14 18:17 ` Alexander Graf
2019-07-12 13:54 ` Dave Hansen
2019-07-12 15:20 ` Peter Zijlstra
2019-07-12 15:16 ` Thomas Gleixner
2019-07-12 16:37 ` Alexandre Chartre
2019-07-12 16:45 ` Andy Lutomirski
2019-07-14 17:11 ` Mike Rapoport
2019-07-12 19:06 ` Peter Zijlstra
2019-07-14 15:06 ` Andy Lutomirski
2019-07-15 10:33 ` Peter Zijlstra
2019-07-12 19:48 ` Thomas Gleixner
2019-07-15 8:23 ` Alexandre Chartre
2019-07-15 8:28 ` Thomas Gleixner
2019-07-12 16:00 ` Thomas Gleixner
2019-07-12 11:44 ` Peter Zijlstra
2019-07-12 12:17 ` Alexandre Chartre
2019-07-12 12:36 ` Peter Zijlstra
2019-07-12 12:47 ` Alexandre Chartre
2019-07-12 13:07 ` Peter Zijlstra
2019-07-12 13:46 ` Alexandre Chartre
2019-07-31 16:31 ` Dario Faggioli
2019-08-22 12:31 ` Alexandre Chartre
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