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Juergen Gross
33be2c3858
Instead of using anonymous memory for hypercall buffers which is then locked into memory, use the hypercall buffer device of the Linux privcmd driver if available. This has the advantage of needing just a single mmap() for allocating the buffer and page migration or compaction can't make the buffer unaccessible for the hypervisor. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
#ifndef XENCALL_PRIVATE_H
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#define XENCALL_PRIVATE_H
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#include <xentoollog.h>
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#include <xentoolcore_internal.h>
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#include <xencall.h>
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#include <xen/xen.h>
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#include <xen/sys/privcmd.h>
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#ifndef PAGE_SHIFT /* Mini-os, Yukk */
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#define PAGE_SHIFT 12
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#endif
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#ifndef __MINIOS__ /* Yukk */
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#endif
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struct xencall_handle {
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xentoollog_logger *logger, *logger_tofree;
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unsigned flags;
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/* partially with /dev/ no /dev/ */
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/* initialised xen/hypercall xen/hypercall */
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int fd; /* any >= 0 >= 0 */
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int buf_fd; /* any >= 0 -1 */
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Xentoolcore__Active_Handle tc_ah;
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/*
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* A simple cache of unused, single page, hypercall buffers
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*
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* Protected by a global lock.
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*/
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#define BUFFER_CACHE_SIZE 4
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int buffer_cache_nr;
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void *buffer_cache[BUFFER_CACHE_SIZE];
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/*
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* Hypercall buffer statistics. All protected by the global
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* buffer_cache lock.
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*/
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int buffer_total_allocations;
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int buffer_total_releases;
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int buffer_current_allocations;
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int buffer_maximum_allocations;
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int buffer_cache_hits;
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int buffer_cache_misses;
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int buffer_cache_toobig;
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};
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int osdep_xencall_open(xencall_handle *xcall);
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int osdep_xencall_close(xencall_handle *xcall);
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int osdep_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall);
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void *osdep_alloc_pages(xencall_handle *xcall, size_t nr_pages);
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void osdep_free_pages(xencall_handle *xcall, void *p, size_t nr_pages);
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void buffer_release_cache(xencall_handle *xcall);
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#define PERROR(_f...) xtl_log(xcall->logger, XTL_ERROR, errno, "xencall", _f)
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#endif
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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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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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