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[Xen-devel] [PATCH 06/27 v10] xen/arm: vpl011: Add a new domctl API to initialize vpl011



Add a new domctl API to initialize vpl011. It takes the GFN and console
backend domid as input and returns an event channel to be used for
sending and receiving events from Xen.

Xen will communicate with xenconsole using GFN as the ring buffer and
the event channel to transmit and receive pl011 data on the guest domain's
behalf.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
---
CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>

Changes since v9:
- Initialized local variable in libxl__arch_build_dom_finish
- Replaced __copy_to_guest with copy_to_guest
- Added comment for console_domid field in vuart_op structure

Changes since v8:
- Added explicit padding in the vuart_op structure
- Moved vuart_op structure after the PSR structure definition
- The input fields moved before the output fields in vuart_op structure
- Checking explicitly that padding fields are initialized to 0

Changes since v6:
- Renamed the vuart initialization function to a generic name xc_dom_vuart_init 
- Used domid_t as a type instead of uint32_t for domid
- Checking the vuart type explicitly against vpl011 enum value

Changes since v5:
- xc_dom_vpl011_init() will be compiled for both x86/arm architectures as there
  is nothing architecture specific in this function. This function will return 
  error when called for x86.
- Fixed coding style issues in libxl.

Changes since v4:
- Removed libxl__arch_domain_create_finish().
- Added a new function libxl__arch_build_dom_finish(), which is called at the 
last
  in libxl__build_dom(). This function calls the vpl011 initialization function 
now.

Changes since v3:
- Added a new arch specific function libxl__arch_domain_create_finish(), which
  calls the vpl011 initialization function. For x86 this function does not do
  anything.
- domain_vpl011_init() takes a pointer to a structure which contains all the 
  required information such as console_domid, gfn instead of passing parameters
  separately.
- Dropped a DOMCTL API defined for de-initializing vpl011 as that should be
  taken care when the domain is destroyed (and not dependent on userspace 
  libraries/applications).

Changes since v2:
- Replaced the DOMCTL APIs defined for get/set of event channel and GFN with 
  a set of DOMCTL APIs for initializing and de-initializing vpl011 emulation.

 tools/libxc/include/xenctrl.h | 20 +++++++++++++++++
 tools/libxc/xc_domain.c       | 27 ++++++++++++++++++++++
 tools/libxl/libxl_arch.h      |  7 ++++++
 tools/libxl/libxl_arm.c       | 27 ++++++++++++++++++++++
 tools/libxl/libxl_dom.c       |  4 ++++
 tools/libxl/libxl_x86.c       |  8 +++++++
 xen/arch/arm/domain.c         |  6 +++++
 xen/arch/arm/domctl.c         | 52 +++++++++++++++++++++++++++++++++++++++++++
 xen/include/public/domctl.h   | 24 ++++++++++++++++++++
 9 files changed, 175 insertions(+)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 073fbc9..2086e71 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -886,6 +886,26 @@ int xc_vcpu_getcontext(xc_interface *xch,
                        vcpu_guest_context_any_t *ctxt);
 
 /**
+ * This function initializes the vuart emulation and returns
+ * the event to be used by the backend for communicating with
+ * the emulation code.
+ *
+ * @parm xch a handle to an open hypervisor interface
+ * #parm type type of vuart
+ * @parm domid the domain to get information from
+ * @parm console_domid the domid of the backend console
+ * @parm gfn the guest pfn to be used as the ring buffer
+ * @parm evtchn the event channel to be used for events
+ * @return 0 on success, negative error on failure
+ */
+int xc_dom_vuart_init(xc_interface *xch,
+                      uint32_t type,
+                      domid_t domid,
+                      domid_t console_domid,
+                      xen_pfn_t gfn,
+                      evtchn_port_t *evtchn);
+
+/**
  * This function returns information about the XSAVE state of a particular
  * vcpu of a domain. If extstate->size and extstate->xfeature_mask are 0,
  * the call is considered a query to retrieve them and the buffer is not
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index f40dc4f..f2e9f0c 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -343,6 +343,33 @@ int xc_domain_get_guest_width(xc_interface *xch, uint32_t 
domid,
     return 0;
 }
 
+int xc_dom_vuart_init(xc_interface *xch,
+                      uint32_t type,
+                      domid_t domid,
+                      domid_t console_domid,
+                      xen_pfn_t gfn,
+                      evtchn_port_t *evtchn)
+{
+    DECLARE_DOMCTL;
+    int rc = 0;
+
+    memset(&domctl, 0, sizeof(domctl));
+
+    domctl.cmd = XEN_DOMCTL_vuart_op;
+    domctl.domain = domid;
+    domctl.u.vuart_op.cmd = XEN_DOMCTL_VUART_OP_INIT;
+    domctl.u.vuart_op.type = type;
+    domctl.u.vuart_op.console_domid = console_domid;
+    domctl.u.vuart_op.gfn = gfn;
+
+    if ( (rc = do_domctl(xch, &domctl)) < 0 )
+        return rc;
+
+    *evtchn = domctl.u.vuart_op.evtchn;
+
+    return rc;
+}
+
 int xc_domain_getinfo(xc_interface *xch,
                       uint32_t first_domid,
                       unsigned int max_doms,
diff --git a/tools/libxl/libxl_arch.h b/tools/libxl/libxl_arch.h
index 5e1fc60..784ec7f 100644
--- a/tools/libxl/libxl_arch.h
+++ b/tools/libxl/libxl_arch.h
@@ -44,6 +44,13 @@ int libxl__arch_domain_finalise_hw_description(libxl__gc *gc,
                                       libxl_domain_build_info *info,
                                       struct xc_dom_image *dom);
 
+/* perform any pending hardware initialization */
+_hidden
+int libxl__arch_build_dom_finish(libxl__gc *gc,
+                                 libxl_domain_build_info *info,
+                                 struct xc_dom_image *dom,
+                                 libxl__domain_build_state *state);
+
 /* build vNUMA vmemrange with arch specific information */
 _hidden
 int libxl__arch_vnuma_build_vmemrange(libxl__gc *gc,
diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
index d842d88..6f5bc3c 100644
--- a/tools/libxl/libxl_arm.c
+++ b/tools/libxl/libxl_arm.c
@@ -1038,6 +1038,33 @@ int libxl__arch_domain_finalise_hw_description(libxl__gc 
*gc,
     return 0;
 }
 
+int libxl__arch_build_dom_finish(libxl__gc *gc,
+                                 libxl_domain_build_info *info,
+                                 struct xc_dom_image *dom,
+                                 libxl__domain_build_state *state)
+{
+    int rc = 0, ret;
+
+    if (info->arch_arm.vuart != LIBXL_VUART_TYPE_SBSA_UART) {
+        rc = 0;
+        goto out;
+    }
+
+    ret = xc_dom_vuart_init(CTX->xch,
+                            XEN_DOMCTL_VUART_TYPE_VPL011,
+                            dom->guest_domid,
+                            dom->console_domid,
+                            dom->vuart_gfn,
+                            &state->vuart_port);
+    if (ret < 0) {
+        rc = ERROR_FAIL;
+        LOG(ERROR, "xc_dom_vuart_init failed\n");
+    }
+
+out:
+    return rc;
+}
+
 int libxl__arch_vnuma_build_vmemrange(libxl__gc *gc,
                                       uint32_t domid,
                                       libxl_domain_build_info *info,
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index e0f0d78..5f92023 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -702,6 +702,10 @@ static int libxl__build_dom(libxl__gc *gc, uint32_t domid,
         LOGE(ERROR, "xc_dom_gnttab_init failed");
         goto out;
     }
+    if ((ret = libxl__arch_build_dom_finish(gc, info, dom, state)) != 0) {
+        LOGE(ERROR, "libxl__arch_build_dom_finish failed");
+        goto out;
+    }
 
 out:
     return ret != 0 ? ERROR_FAIL : 0;
diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
index 455f6f0..0aaeded 100644
--- a/tools/libxl/libxl_x86.c
+++ b/tools/libxl/libxl_x86.c
@@ -391,6 +391,14 @@ int libxl__arch_domain_finalise_hw_description(libxl__gc 
*gc,
     return rc;
 }
 
+int libxl__arch_build_dom_finish(libxl__gc *gc,
+                                 libxl_domain_build_info *info,
+                                 struct xc_dom_image *dom,
+                                 libxl__domain_build_state *state)
+{
+    return 0;
+}
+
 /* Return 0 on success, ERROR_* on failure. */
 int libxl__arch_vnuma_build_vmemrange(libxl__gc *gc,
                                       uint32_t domid,
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 784ae39..0779087 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -874,6 +874,12 @@ int domain_relinquish_resources(struct domain *d)
         if ( ret )
             return ret;
 
+        /*
+         * Release the resources allocated for vpl011 which were
+         * allocated via a DOMCTL call XEN_DOMCTL_vuart_op.
+         */
+        domain_vpl011_deinit(d);
+
         d->arch.relmem = RELMEM_xen;
         /* Fallthrough */
 
diff --git a/xen/arch/arm/domctl.c b/xen/arch/arm/domctl.c
index 8232f44..4587c75 100644
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -5,9 +5,11 @@
  */
 
 #include <xen/errno.h>
+#include <xen/guest_access.h>
 #include <xen/hypercall.h>
 #include <xen/iocap.h>
 #include <xen/lib.h>
+#include <xen/mm.h>
 #include <xen/sched.h>
 #include <xen/types.h>
 #include <xsm/xsm.h>
@@ -20,6 +22,29 @@ void arch_get_domain_info(const struct domain *d,
     info->flags |= XEN_DOMINF_hap;
 }
 
+static int handle_vuart_init(struct domain *d, 
+                             struct xen_domctl_vuart_op *vuart_op)
+{
+    int rc;
+    struct vpl011_init_info info;
+
+    info.console_domid = vuart_op->console_domid;
+    info.gfn = _gfn(vuart_op->gfn);
+
+    if ( d->creation_finished )
+        return -EPERM;
+
+    if ( vuart_op->type != XEN_DOMCTL_VUART_TYPE_VPL011 )
+        return -EOPNOTSUPP;
+
+    rc = domain_vpl011_init(d, &info);
+
+    if ( !rc )
+        vuart_op->evtchn = info.evtchn;
+
+    return rc;
+}
+
 long arch_do_domctl(struct xen_domctl *domctl, struct domain *d,
                     XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
 {
@@ -119,6 +144,33 @@ long arch_do_domctl(struct xen_domctl *domctl, struct 
domain *d,
         d->disable_migrate = domctl->u.disable_migrate.disable;
         return 0;
 
+    case XEN_DOMCTL_vuart_op:
+    {
+        int rc;
+        unsigned int i;
+        struct xen_domctl_vuart_op *vuart_op = &domctl->u.vuart_op;
+
+        /* check that structure padding must be 0. */
+        for ( i = 0; i < sizeof(vuart_op->pad); i++ )
+            if ( vuart_op->pad[i] )
+                return -EINVAL;
+
+        switch( vuart_op->cmd )
+        {
+        case XEN_DOMCTL_VUART_OP_INIT:
+            rc = handle_vuart_init(d, vuart_op);
+            break;
+
+        default:
+            rc = -EINVAL;
+            break;
+        }
+
+        if ( !rc )
+            rc = copy_to_guest(u_domctl, domctl, 1);
+
+        return rc;
+    }
     default:
     {
         int rc;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index e2fd685..9dcc969 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -33,6 +33,7 @@
 #endif
 
 #include "xen.h"
+#include "event_channel.h"
 #include "grant_table.h"
 #include "hvm/save.h"
 #include "memory.h"
@@ -1077,6 +1078,27 @@ struct xen_domctl_set_gnttab_limits {
     uint32_t maptrack_frames;  /* IN */
 };
 
+/* XEN_DOMCTL_vuart_op */
+struct xen_domctl_vuart_op {
+#define XEN_DOMCTL_VUART_OP_INIT  0
+        uint32_t cmd;           /* XEN_DOMCTL_VUART_OP_* */
+#define XEN_DOMCTL_VUART_TYPE_VPL011 0
+        uint32_t type;          /* IN - type of vuart.
+                                 *      Currently only vpl011 supported.
+                                 */
+        uint64_aligned_t  gfn;  /* IN - guest gfn to be used as a
+                                 *      ring buffer.
+                                 */
+        domid_t console_domid;  /* IN - domid of domain running the
+                                 *      backend console.
+                                 */
+        uint8_t pad[2];
+        evtchn_port_t evtchn;   /* OUT - remote port of the event
+                                 *       channel used for sending
+                                 *       ring buffer events.
+                                 */
+};
+
 struct xen_domctl {
     uint32_t cmd;
 #define XEN_DOMCTL_createdomain                   1
@@ -1155,6 +1177,7 @@ struct xen_domctl {
 #define XEN_DOMCTL_psr_cat_op                    78
 #define XEN_DOMCTL_soft_reset                    79
 #define XEN_DOMCTL_set_gnttab_limits             80
+#define XEN_DOMCTL_vuart_op                      81
 #define XEN_DOMCTL_gdbsx_guestmemio            1000
 #define XEN_DOMCTL_gdbsx_pausevcpu             1001
 #define XEN_DOMCTL_gdbsx_unpausevcpu           1002
@@ -1218,6 +1241,7 @@ struct xen_domctl {
         struct xen_domctl_monitor_op        monitor_op;
         struct xen_domctl_psr_cat_op        psr_cat_op;
         struct xen_domctl_set_gnttab_limits set_gnttab_limits;
+        struct xen_domctl_vuart_op          vuart_op;
         uint8_t                             pad[128];
     } u;
 };
-- 
2.7.4


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