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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1fac3cfb9c
In nVHE protected mode, the EL2 code uses a temporary allocator during
boot while re-creating its stage-1 page-table. Unfortunately, the
hyp_vmmemap is not ready to use at this stage, so refcounting pages
is not possible. That is not currently a problem because hyp stage-1
mappings are never removed, which implies refcounting of page-table
pages is unnecessary.
In preparation for allowing hypervisor stage-1 mappings to be removed,
provide stub implementations for {get,put}_page() in the early allocator.
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211215161232.1480836-2-qperret@google.com
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Google LLC
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* Author: Quentin Perret <qperret@google.com>
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*/
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#include <asm/kvm_pgtable.h>
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#include <nvhe/early_alloc.h>
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#include <nvhe/memory.h>
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struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
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s64 __ro_after_init hyp_physvirt_offset;
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static unsigned long base;
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static unsigned long end;
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static unsigned long cur;
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unsigned long hyp_early_alloc_nr_used_pages(void)
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{
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return (cur - base) >> PAGE_SHIFT;
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}
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void *hyp_early_alloc_contig(unsigned int nr_pages)
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{
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unsigned long size = (nr_pages << PAGE_SHIFT);
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void *ret = (void *)cur;
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if (!nr_pages)
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return NULL;
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if (end - cur < size)
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return NULL;
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cur += size;
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memset(ret, 0, size);
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return ret;
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}
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void *hyp_early_alloc_page(void *arg)
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{
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return hyp_early_alloc_contig(1);
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}
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static void hyp_early_alloc_get_page(void *addr) { }
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static void hyp_early_alloc_put_page(void *addr) { }
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void hyp_early_alloc_init(void *virt, unsigned long size)
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{
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base = cur = (unsigned long)virt;
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end = base + size;
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hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
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hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
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hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
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hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page;
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hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page;
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}
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