[PATCH 05/14 v4] xen/arm: vpl011: Allocate a new GFN in the toolstack for vuart

[Bhupinder Thakur <bhupinder.thakur@linaro.org>]

Allocate a new gfn to be used as a ring buffer between xenconsole
and Xen for sending/receiving pl011 console data.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
---
CC: ij
CC: wl
CC: ss
CC: jg

Changes since v3:
- Added a new helper function xc_get_vuart_gfn() to return the GFN allocated for
  vpl011.
- Since a new function has been added in this patch, I have not included Stefano's
  reviewed-by and Wei's acked-by tags.

Changes since v2:
- Removed the DOMCTL call to set the GFN as now this information is passed
  in the DOMCTL call to initialize vpl011 emulation.

 tools/libxc/include/xc_dom.h |  3 +++
 tools/libxc/xc_dom_arm.c     | 12 +++++++++++-
 tools/libxc/xc_dom_boot.c    |  2 ++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index ce47058..1cde2b7 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -216,6 +216,8 @@ struct xc_dom_image {
 
     /* Extra SMBIOS structures passed to HVMLOADER */
     struct xc_hvm_firmware_module smbios_module;
+
+    xen_pfn_t vuart_gfn;
 };
 
 /* --- pluggable kernel loader ------------------------------------- */
@@ -334,6 +336,7 @@ int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
                        domid_t console_domid,
                        domid_t xenstore_domid);
 bool xc_dom_translated(const struct xc_dom_image *dom);
+xen_pfn_t xc_get_vuart_gfn(void);
 
 /* --- debugging bits ---------------------------------------------- */
 
diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index e7d4bd0..89d0d37 100644
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -26,10 +26,11 @@
 #include "xg_private.h"
 #include "xc_dom.h"
 
-#define NR_MAGIC_PAGES 3
+#define NR_MAGIC_PAGES 4
 #define CONSOLE_PFN_OFFSET 0
 #define XENSTORE_PFN_OFFSET 1
 #define MEMACCESS_PFN_OFFSET 2
+#define VUART_PFN_OFFSET 3
 
 #define LPAE_SHIFT 9
 
@@ -64,6 +65,13 @@ static int setup_pgtables_arm(struct xc_dom_image *dom)
 
 /* ------------------------------------------------------------------------ */
 
+xen_pfn_t xc_get_vuart_gfn()
+{
+    const xen_pfn_t base = GUEST_MAGIC_BASE >> XC_PAGE_SHIFT;
+
+    return base + VUART_PFN_OFFSET;
+}
+
 static int alloc_magic_pages(struct xc_dom_image *dom)
 {
     int rc, i;
@@ -85,10 +93,12 @@ static int alloc_magic_pages(struct xc_dom_image *dom)
 
     dom->console_pfn = base + CONSOLE_PFN_OFFSET;
     dom->xenstore_pfn = base + XENSTORE_PFN_OFFSET;
+    dom->vuart_gfn = base + VUART_PFN_OFFSET;
 
     xc_clear_domain_page(dom->xch, dom->guest_domid, dom->console_pfn);
     xc_clear_domain_page(dom->xch, dom->guest_domid, dom->xenstore_pfn);
     xc_clear_domain_page(dom->xch, dom->guest_domid, base + MEMACCESS_PFN_OFFSET);
+    xc_clear_domain_page(dom->xch, dom->guest_domid, base + VUART_PFN_OFFSET);
     xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_CONSOLE_PFN,
             dom->console_pfn);
     xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_STORE_PFN,
diff --git a/tools/libxc/xc_dom_boot.c b/tools/libxc/xc_dom_boot.c
index c3b44dd..8a376d0 100644
--- a/tools/libxc/xc_dom_boot.c
+++ b/tools/libxc/xc_dom_boot.c
@@ -226,6 +226,8 @@ int xc_dom_boot_image(struct xc_dom_image *dom)
         return rc;
     if ( (rc = clear_page(dom, dom->xenstore_pfn)) != 0 )
         return rc;
+    if ( (rc = clear_page(dom, dom->vuart_gfn)) != 0 )
+        return rc;
 
     /* start info page */
     if ( dom->arch_hooks->start_info )
-- 
2.7.4


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