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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH qemu] Support grant references in mapping
On Fri, Jan 07, 2011 at 05:09:40PM -0500, Daniel De Graaf wrote:
> This is untested in qemu, but is the same patch as was applied to the
> server I have tested. It applies to the ioemu-remote that I am using.
I lost track of this patchset. I think we need to first have somebody
familiar with QEMU review these patches.
CC-ing Stefano, Ian, Anthony
>
> ---
>
> Request and support using grant references in backends for
> the keyboard and framebuffer.
>
> Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
>
> ---
>
> diff --git a/hw/xenfb.c b/hw/xenfb.c
> index 97960ba..c8d7a3e 100644
> --- a/hw/xenfb.c
> +++ b/hw/xenfb.c
> @@ -61,6 +61,7 @@ struct common {
> struct XenDevice xendev; /* must be first */
> void *page;
> DisplayState *ds;
> + int uses_gref;
> };
>
> struct XenInput {
> @@ -100,22 +101,27 @@ struct XenFB {
>
> static int common_bind(struct common *c)
> {
> - int mfn;
> + int ref;
>
> - if (xenstore_read_fe_int(&c->xendev, "page-ref", &mfn) == -1)
> - return -1;
> if (xenstore_read_fe_int(&c->xendev, "event-channel",
> &c->xendev.remote_port) == -1)
> return -1;
>
> - c->page = xc_map_foreign_range(xen_xc, c->xendev.dom,
> - XC_PAGE_SIZE,
> - PROT_READ | PROT_WRITE, mfn);
> + if (xenstore_read_fe_int(&c->xendev, "page-gref", &ref) == 0) {
> + c->page = xc_gnttab_map_grant_ref(xen_xc, c->xendev.gnttabdev,
> c->xendev.dom, ref, PROT_READ | PROT_WRITE);
> + c->uses_gref = 1;
> + } else if (xenstore_read_fe_int(&c->xendev, "page-ref", &ref) == 0) {
> + xen_pfn_t pfn = ref;
> + c->page = xc_map_foreign_pages(xen_xc, c->xendev.dom, PROT_READ |
> PROT_WRITE, &pfn, 1);
> + c->uses_gref = 0;
> + } else
> + return -1;
> +
> if (c->page == NULL)
> return -1;
>
> xen_be_bind_evtchn(&c->xendev);
> - xen_be_printf(&c->xendev, 1, "ring mfn %d, remote-port %d, local-port
> %d\n",
> - mfn, c->xendev.remote_port, c->xendev.local_port);
> + xen_be_printf(&c->xendev, 1, "ring ref %d, remote-port %d, local-port
> %d\n",
> + ref, c->xendev.remote_port, c->xendev.local_port);
>
> return 0;
> }
> @@ -123,10 +129,12 @@ static int common_bind(struct common *c)
> static void common_unbind(struct common *c)
> {
> xen_be_unbind_evtchn(&c->xendev);
> - if (c->page) {
> + if (c->page && c->uses_gref) {
> + xc_gnttab_munmap(xen_xc, c->xendev.gnttabdev, c->page, 1);
> + } else if (c->page) {
> munmap(c->page, XC_PAGE_SIZE);
> - c->page = NULL;
> }
> + c->page = NULL;
> }
>
> /* -------------------------------------------------------------------- */
> @@ -422,8 +430,6 @@ static int xenfb_map_fb(struct XenFB *xenfb)
> struct xenfb_page *page = xenfb->c.page;
> char *protocol = xenfb->c.xendev.protocol;
> int n_fbdirs;
> - unsigned long *pgmfns = NULL;
> - unsigned long *fbmfns = NULL;
> void *map, *pd;
> int mode, ret = -1;
>
> @@ -472,36 +478,72 @@ static int xenfb_map_fb(struct XenFB *xenfb)
> #endif
> }
>
> - if (xenfb->pixels) {
> + if (xenfb->pixels && xenfb->c.uses_gref) {
> + xc_gnttab_munmap(xen_xc, xenfb->c.xendev.gnttabdev, xenfb->pixels,
> xenfb->fbpages);
> + } else if (xenfb->pixels) {
> munmap(xenfb->pixels, xenfb->fbpages * XC_PAGE_SIZE);
> - xenfb->pixels = NULL;
> }
> + xenfb->pixels = NULL;
>
> xenfb->fbpages = (xenfb->fb_len + (XC_PAGE_SIZE - 1)) / XC_PAGE_SIZE;
> n_fbdirs = xenfb->fbpages * mode / 8;
> n_fbdirs = (n_fbdirs + (XC_PAGE_SIZE - 1)) / XC_PAGE_SIZE;
>
> - pgmfns = qemu_mallocz(sizeof(unsigned long) * n_fbdirs);
> - fbmfns = qemu_mallocz(sizeof(unsigned long) * xenfb->fbpages);
> + if (xenfb->c.uses_gref) {
> + uint32_t* domids = qemu_mallocz(sizeof(uint32_t)*n_fbdirs);
> + uint32_t* refs = qemu_mallocz(sizeof(uint32_t)*n_fbdirs);
> + int i;
> + for(i=0; i < n_fbdirs; i++)
> + {
> + domids[i] = xenfb->c.xendev.dom;
> + refs[i] = (mode == 32) ? ((uint32_t*)pd)[i] : ((uint64_t*)pd)[i];
> + }
>
> - xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
> - map = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
> - PROT_READ, pgmfns, n_fbdirs);
> - if (map == NULL)
> - goto out;
> - xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
> - munmap(map, n_fbdirs * XC_PAGE_SIZE);
> + map = xc_gnttab_map_grant_refs(xen_xc, xenfb->c.xendev.gnttabdev,
> + n_fbdirs, domids, refs, PROT_READ);
> + qemu_free(domids);
> + qemu_free(refs);
> +
> + if (map == NULL)
> + goto out;
> +
> + domids = qemu_mallocz(sizeof(uint32_t)*xenfb->fbpages);
> + refs = qemu_mallocz(sizeof(uint32_t)*xenfb->fbpages);
> + for(i=0; i < xenfb->fbpages; i++)
> + {
> + domids[i] = xenfb->c.xendev.dom;
> + refs[i] = (mode == 32) ? ((uint32_t*)map)[i] : ((uint64_t*)map)[i];
> + }
> +
> + xc_gnttab_munmap(xen_xc, xenfb->c.xendev.gnttabdev, map, n_fbdirs);
> + xenfb->pixels = xc_gnttab_map_grant_refs(xen_xc,
> xenfb->c.xendev.gnttabdev,
> + xenfb->fbpages, domids, refs, PROT_READ);
> + qemu_free(domids);
> + qemu_free(refs);
> + } else {
> + unsigned long *pgmfns = qemu_mallocz(sizeof(unsigned long) * n_fbdirs);
> + xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
> + map = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
> + PROT_READ, pgmfns, n_fbdirs);
> + qemu_free(pgmfns);
> +
> + if (map == NULL)
> + goto out;
> +
> + unsigned long *fbmfns = qemu_mallocz(sizeof(unsigned long) *
> xenfb->fbpages);
> + xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
> + munmap(map, n_fbdirs * XC_PAGE_SIZE);
> + xenfb->pixels = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
> + PROT_READ | PROT_WRITE, fbmfns,
> xenfb->fbpages);
> + qemu_free(fbmfns);
> + }
>
> - xenfb->pixels = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
> - PROT_READ | PROT_WRITE, fbmfns,
> xenfb->fbpages);
> if (xenfb->pixels == NULL)
> goto out;
>
> ret = 0; /* all is fine */
>
> out:
> - qemu_free(pgmfns);
> - qemu_free(fbmfns);
> return ret;
> }
>
> @@ -860,6 +902,8 @@ static int fb_init(struct XenDevice *xendev)
> #ifdef XENFB_TYPE_RESIZE
> xenstore_write_be_int(xendev, "feature-resize", 1);
> #endif
> + xenstore_write_be_int(xendev, "use-grants", 1);
> +
> return 0;
> }
>
> @@ -913,6 +957,13 @@ static void fb_disconnect(struct XenDevice *xendev)
> {
> struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
>
> + if (fb->pixels && fb->c.uses_gref) {
> + xc_gnttab_munmap(xen_xc, fb->c.xendev.gnttabdev, fb->pixels,
> fb->fbpages);
> + } else if (fb->pixels) {
> + // Note: not needed if we are doing the mmap() below
> + // munmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE);
> + }
> +
> /*
> * FIXME: qemu can't un-init gfx display (yet?).
> * Replacing the framebuffer with anonymous shared memory
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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