a93871d0ea
Move the generic userfaultfd code out of demand_paging_test.c into a common library, userfaultfd_util. This library consists of a setup and a stop function. The setup function starts a thread for handling page faults using the handler callback function. This setup returns a uffd_desc object which is then used in the stop function (to wait and destroy the threads). Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Reviewed-by: Ben Gardon <bgardon@google.com> Signed-off-by: Ricardo Koller <ricarkol@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221017195834.2295901-2-ricarkol@google.com
46 lines
997 B
C
46 lines
997 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* KVM userfaultfd util
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*
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* Copyright (C) 2018, Red Hat, Inc.
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* Copyright (C) 2019-2022 Google LLC
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*/
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#define _GNU_SOURCE /* for pipe2 */
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#include <inttypes.h>
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#include <time.h>
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#include <pthread.h>
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#include <linux/userfaultfd.h>
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#include "test_util.h"
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typedef int (*uffd_handler_t)(int uffd_mode, int uffd, struct uffd_msg *msg);
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struct uffd_desc {
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int uffd_mode;
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int uffd;
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int pipefds[2];
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useconds_t delay;
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uffd_handler_t handler;
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pthread_t thread;
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};
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struct uffd_desc *uffd_setup_demand_paging(int uffd_mode, useconds_t delay,
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void *hva, uint64_t len,
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uffd_handler_t handler);
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void uffd_stop_demand_paging(struct uffd_desc *uffd);
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#ifdef PRINT_PER_PAGE_UPDATES
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#define PER_PAGE_DEBUG(...) printf(__VA_ARGS__)
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#else
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#define PER_PAGE_DEBUG(...) _no_printf(__VA_ARGS__)
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#endif
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#ifdef PRINT_PER_VCPU_UPDATES
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#define PER_VCPU_DEBUG(...) printf(__VA_ARGS__)
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#else
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#define PER_VCPU_DEBUG(...) _no_printf(__VA_ARGS__)
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#endif
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