[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 7/8] libxc: add hypercall buffer arrays
From: David Vrabel <david.vrabel@xxxxxxxxxx> Hypercall buffer arrays are used when a hypercall takes a variable length array of buffers. Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> --- tools/libxc/xc_hcall_buf.c | 73 ++++++++++++++++++++++++++++++++++++++++++++ tools/libxc/xenctrl.h | 27 ++++++++++++++++ 2 files changed, 100 insertions(+), 0 deletions(-) diff --git a/tools/libxc/xc_hcall_buf.c b/tools/libxc/xc_hcall_buf.c index ced9abd..3e01f3f 100644 --- a/tools/libxc/xc_hcall_buf.c +++ b/tools/libxc/xc_hcall_buf.c @@ -228,6 +228,79 @@ void xc__hypercall_bounce_post(xc_interface *xch, xc_hypercall_buffer_t *b) xc__hypercall_buffer_free(xch, b); } +struct xc_hypercall_buffer_array { + unsigned max_bufs; + xc_hypercall_buffer_t *bufs; +}; + +xc_hypercall_buffer_array_t *xc_hypercall_buffer_array_create(xc_interface *xch, + unsigned n) +{ + xc_hypercall_buffer_array_t *array; + xc_hypercall_buffer_t *bufs = NULL; + + array = malloc(sizeof(*array)); + if ( array == NULL ) + goto error; + + bufs = calloc(n, sizeof(*bufs)); + if ( bufs == NULL ) + goto error; + + array->max_bufs = n; + array->bufs = bufs; + + return array; + +error: + free(bufs); + free(array); + return NULL; +} + +void *xc__hypercall_buffer_array_alloc(xc_interface *xch, + xc_hypercall_buffer_array_t *array, + unsigned index, + xc_hypercall_buffer_t *hbuf, + size_t size) +{ + void *buf; + + if ( index >= array->max_bufs || array->bufs[index].hbuf ) + abort(); + + buf = xc__hypercall_buffer_alloc(xch, hbuf, size); + if ( buf ) + array->bufs[index] = *hbuf; + return buf; +} + +void *xc__hypercall_buffer_array_get(xc_interface *xch, + xc_hypercall_buffer_array_t *array, + unsigned index, + xc_hypercall_buffer_t *hbuf) +{ + if ( index >= array->max_bufs || array->bufs[index].hbuf == NULL ) + abort(); + + *hbuf = array->bufs[index]; + return array->bufs[index].hbuf; +} + +void xc_hypercall_buffer_array_destroy(xc_interface *xc, + xc_hypercall_buffer_array_t *array) +{ + unsigned i; + + if ( array == NULL ) + return; + + for (i = 0; i < array->max_bufs; i++ ) + xc__hypercall_buffer_free(xc, &array->bufs[i]); + free(array->bufs); + free(array); +} + /* * Local variables: * mode: C diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h index 32122fd..c3b2c28 100644 --- a/tools/libxc/xenctrl.h +++ b/tools/libxc/xenctrl.h @@ -317,6 +317,33 @@ void xc__hypercall_buffer_free_pages(xc_interface *xch, xc_hypercall_buffer_t *b #define xc_hypercall_buffer_free_pages(_xch, _name, _nr) xc__hypercall_buffer_free_pages(_xch, HYPERCALL_BUFFER(_name), _nr) /* + * Array of hypercall buffers. + * + * Create an array with xc_hypercall_buffer_array_create() and + * populate it by declaring one hypercall buffer in a loop and + * allocating the buffer with xc_hypercall_buffer_array_alloc(). + * + * To access a previously allocated buffers, declare a new hypercall + * buffer and call xc_hypercall_buffer_array_get(). + * + * Destroy the array with xc_hypercall_buffer_array_destroy() to free + * the array and all its alocated hypercall buffers. + */ +struct xc_hypercall_buffer_array; +typedef struct xc_hypercall_buffer_array xc_hypercall_buffer_array_t; + +xc_hypercall_buffer_array_t *xc_hypercall_buffer_array_create(xc_interface *xch, unsigned n); +void *xc__hypercall_buffer_array_alloc(xc_interface *xch, xc_hypercall_buffer_array_t *array, + unsigned index, xc_hypercall_buffer_t *hbuf, size_t size); +#define xc_hypercall_buffer_array_alloc(_xch, _array, _index, _name, _size) \ + xc__hypercall_buffer_array_alloc(_xch, _array, _index, HYPERCALL_BUFFER(_name), _size) +void *xc__hypercall_buffer_array_get(xc_interface *xch, xc_hypercall_buffer_array_t *array, + unsigned index, xc_hypercall_buffer_t *hbuf); +#define xc_hypercall_buffer_array_get(_xch, _array, _index, _name, _size) \ + xc__hypercall_buffer_array_get(_xch, _array, _index, HYPERCALL_BUFFER(_name)) +void xc_hypercall_buffer_array_destroy(xc_interface *xc, xc_hypercall_buffer_array_t *array); + +/* * CPUMAP handling */ typedef uint8_t *xc_cpumap_t; -- 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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