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https://github.com/xen-project/xen.git
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Ian Campbell
3248691679
libxenforeignmemory will provide a stable API and ABI for mapping foreign domain memory (subject to appropriate privileges). The new library exposes an interface equivalent to xc_map_foreign_memory_bulk, which all the other xc_map_foreign_memory_* functions (which remain in libxc) are implemented in terms of. Upon request (via #define XC_WANT_COMPAT_MAP_FOREIGN_API) libxenctrl will provide a compat API for the old names. This is used by qemu-xen and qemu-trad as well as various in tree things (which required de-dupping various #includes in some too to get the #define before the first). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> [ ijc -- updated MINIOS_UPSTREAM_REVISION and QEMU_TRADITIONAL_REVISION ]
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* Trigger a page-in in a separate thread-of-execution to avoid deadlock */
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#include <pthread.h>
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#include "xenpaging.h"
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struct page_in_args {
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domid_t dom;
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unsigned long *pagein_queue;
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xc_interface *xch;
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};
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static struct page_in_args page_in_args;
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static unsigned long page_in_request;
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static unsigned int page_in_possible;
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static pthread_t page_in_thread;
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static pthread_cond_t page_in_cond = PTHREAD_COND_INITIALIZER;
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static pthread_mutex_t page_in_mutex = PTHREAD_MUTEX_INITIALIZER;
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static void *page_in(void *arg)
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{
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struct page_in_args *pia = arg;
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void *page;
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int i, num;
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xen_pfn_t gfns[XENPAGING_PAGEIN_QUEUE_SIZE];
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while (1)
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{
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pthread_mutex_lock(&page_in_mutex);
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while (!page_in_request)
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pthread_cond_wait(&page_in_cond, &page_in_mutex);
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num = 0;
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for (i = 0; i < XENPAGING_PAGEIN_QUEUE_SIZE; i++)
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{
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if (!pia->pagein_queue[i])
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continue;
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gfns[num] = pia->pagein_queue[i];
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pia->pagein_queue[i] = 0;
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num++;
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}
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page_in_request = 0;
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pthread_mutex_unlock(&page_in_mutex);
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/* Ignore errors */
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page = xc_map_foreign_pages(pia->xch, pia->dom, PROT_READ, gfns, num);
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if (page)
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munmap(page, PAGE_SIZE * num);
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}
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page_in_possible = 0;
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pthread_exit(NULL);
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}
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void page_in_trigger(void)
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{
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if (!page_in_possible)
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return;
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pthread_mutex_lock(&page_in_mutex);
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page_in_request = 1;
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pthread_mutex_unlock(&page_in_mutex);
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pthread_cond_signal(&page_in_cond);
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}
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void create_page_in_thread(struct xenpaging *paging)
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{
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page_in_args.dom = paging->vm_event.domain_id;
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page_in_args.pagein_queue = paging->pagein_queue;
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page_in_args.xch = paging->xc_handle;
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if (pthread_create(&page_in_thread, NULL, page_in, &page_in_args) == 0)
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page_in_possible = 1;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* indent-tabs-mode: nil
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* End:
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*/
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