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12eeb04ab4
Rename to migration_legacy_page_bits, to make it clear that we cannot change the value without causing a migration break. Move to page-vary.h and page-vary-target.c. Define via TARGET_PAGE_BITS if not TARGET_PAGE_BITS_VARY. Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
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* Definitions for cpus with variable page sizes.
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EXEC_PAGE_VARY_H
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#define EXEC_PAGE_VARY_H
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typedef struct {
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bool decided;
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int bits;
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uint64_t mask;
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} TargetPageBits;
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#ifdef IN_PAGE_VARY
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bool set_preferred_target_page_bits_common(int bits);
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void finalize_target_page_bits_common(int min);
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#endif
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/**
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* set_preferred_target_page_bits:
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* @bits: number of bits needed to represent an address within the page
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*
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* Set the preferred target page size (the actual target page
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* size may be smaller than any given CPU's preference).
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* Returns true on success, false on failure (which can only happen
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* if this is called after the system has already finalized its
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* choice of page size and the requested page size is smaller than that).
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*/
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bool set_preferred_target_page_bits(int bits);
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/**
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* finalize_target_page_bits:
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* Commit the final value set by set_preferred_target_page_bits.
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*/
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void finalize_target_page_bits(void);
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/**
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* migration_legacy_page_bits
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*
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* For migration compatibility with qemu v2.9, prior to the introduction
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* of the configuration/target-page-bits section, return the value of
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* TARGET_PAGE_BITS that the target had then.
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*/
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int migration_legacy_page_bits(void);
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#endif /* EXEC_PAGE_VARY_H */
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