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0cbe3e26ab
Patch series "NestMMU pte upgrade workaround for mprotect", v5.
We can upgrade pte access (R -> RW transition) via mprotect. We need to
make sure we follow the recommended pte update sequence as outlined in
commit bd5050e38a ("powerpc/mm/radix: Change pte relax sequence to
handle nest MMU hang") for such updates. This patch series does that.
This patch (of 5):
Some architectures may want to call flush_tlb_range from these helpers.
Link: http://lkml.kernel.org/r/20190116085035.29729-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
29 lines
667 B
C
29 lines
667 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XEN_MMU_H
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#include <linux/linkage.h>
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#include <asm/page.h>
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enum pt_level {
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PT_PGD,
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PT_P4D,
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PT_PUD,
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PT_PMD,
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PT_PTE
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};
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bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
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void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
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pte_t xen_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
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void xen_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
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pte_t *ptep, pte_t pte);
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unsigned long xen_read_cr2_direct(void);
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extern void xen_init_mmu_ops(void);
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extern void xen_hvm_init_mmu_ops(void);
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#endif /* _XEN_MMU_H */
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