@@ -323,12 +323,8 @@ void *xc_dom_boot_domU_map(struct xc_dom_image *dom, xen_pfn_t pfn,
int xc_dom_boot_image(struct xc_dom_image *dom);
int xc_dom_compat_check(struct xc_dom_image *dom);
int xc_dom_gnttab_init(struct xc_dom_image *dom);
-int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gmfn,
- xen_pfn_t xenstore_gmfn,
- domid_t console_domid,
- domid_t xenstore_domid);
-int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
+int xc_dom_gnttab_seed(xc_interface *xch, domid_t guest_domid,
+ bool is_hvm,
xen_pfn_t console_gmfn,
xen_pfn_t xenstore_gmfn,
domid_t console_domid,
@@ -280,11 +280,29 @@ static xen_pfn_t xc_dom_gnttab_setup(xc_interface *xch, domid_t domid)
return gmfn;
}
-int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gmfn,
- xen_pfn_t xenstore_gmfn,
- domid_t console_domid,
- domid_t xenstore_domid)
+static void xc_dom_set_gnttab_entry(xc_interface *xch,
+ grant_entry_v1_t *gnttab,
+ unsigned int idx,
+ domid_t guest_domid,
+ domid_t backend_domid,
+ xen_pfn_t backend_gmfn)
+{
+ if ( guest_domid == backend_domid || backend_gmfn == -1)
+ return;
+
+ xc_dom_printf(xch, "%s: [%u] -> 0x%"PRI_xen_pfn,
+ __FUNCTION__, idx, backend_gmfn);
+
+ gnttab[idx].flags = GTF_permit_access;
+ gnttab[idx].domid = backend_domid;
+ gnttab[idx].frame = backend_gmfn;
+}
+
+static int compat_gnttab_seed(xc_interface *xch, domid_t domid,
+ xen_pfn_t console_gmfn,
+ xen_pfn_t xenstore_gmfn,
+ domid_t console_domid,
+ domid_t xenstore_domid)
{
xen_pfn_t gnttab_gmfn;
@@ -308,18 +326,10 @@ int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
return -1;
}
- if ( domid != console_domid && console_gmfn != -1)
- {
- gnttab[GNTTAB_RESERVED_CONSOLE].flags = GTF_permit_access;
- gnttab[GNTTAB_RESERVED_CONSOLE].domid = console_domid;
- gnttab[GNTTAB_RESERVED_CONSOLE].frame = console_gmfn;
- }
- if ( domid != xenstore_domid && xenstore_gmfn != -1)
- {
- gnttab[GNTTAB_RESERVED_XENSTORE].flags = GTF_permit_access;
- gnttab[GNTTAB_RESERVED_XENSTORE].domid = xenstore_domid;
- gnttab[GNTTAB_RESERVED_XENSTORE].frame = xenstore_gmfn;
- }
+ xc_dom_set_gnttab_entry(xch, gnttab, GNTTAB_RESERVED_CONSOLE,
+ domid, console_domid, console_gmfn);
+ xc_dom_set_gnttab_entry(xch, gnttab, GNTTAB_RESERVED_XENSTORE,
+ domid, xenstore_domid, xenstore_gmfn);
if ( munmap(gnttab, PAGE_SIZE) == -1 )
{
@@ -337,11 +347,11 @@ int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
return 0;
}
-int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gpfn,
- xen_pfn_t xenstore_gpfn,
- domid_t console_domid,
- domid_t xenstore_domid)
+static int compat_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
+ xen_pfn_t console_gpfn,
+ xen_pfn_t xenstore_gpfn,
+ domid_t console_domid,
+ domid_t xenstore_domid)
{
int rc;
xen_pfn_t scratch_gpfn;
@@ -380,7 +390,7 @@ int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
return -1;
}
- rc = xc_dom_gnttab_seed(xch, domid,
+ rc = compat_gnttab_seed(xch, domid,
console_gpfn, xenstore_gpfn,
console_domid, xenstore_domid);
if (rc != 0)
@@ -405,18 +415,60 @@ int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
return 0;
}
-int xc_dom_gnttab_init(struct xc_dom_image *dom)
+int xc_dom_gnttab_seed(xc_interface *xch, domid_t guest_domid,
+ bool is_hvm, xen_pfn_t console_gmfn,
+ xen_pfn_t xenstore_gmfn, domid_t console_domid,
+ domid_t xenstore_domid)
{
- if ( xc_dom_translated(dom) ) {
- return xc_dom_gnttab_hvm_seed(dom->xch, dom->guest_domid,
- dom->console_pfn, dom->xenstore_pfn,
- dom->console_domid, dom->xenstore_domid);
- } else {
- return xc_dom_gnttab_seed(dom->xch, dom->guest_domid,
- xc_dom_p2m(dom, dom->console_pfn),
- xc_dom_p2m(dom, dom->xenstore_pfn),
- dom->console_domid, dom->xenstore_domid);
+ xenforeignmemory_handle* fmem = xch->fmem;
+ xenforeignmemory_resource_handle *fres;
+ void *addr = NULL;
+
+ fres = xenforeignmemory_map_resource(fmem, guest_domid,
+ XENMEM_resource_grant_table,
+ 0, 0, 1,
+ &addr, PROT_READ | PROT_WRITE, 0);
+ if ( !fres )
+ {
+ if ( errno == EOPNOTSUPP )
+ return is_hvm ?
+ compat_gnttab_hvm_seed(xch, guest_domid,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid) :
+ compat_gnttab_seed(xch, guest_domid,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid);
+
+ xc_dom_panic(xch, XC_INTERNAL_ERROR,
+ "%s: failed to acquire grant table "
+ "[errno=%d]\n",
+ __FUNCTION__, errno);
+ return -1;
}
+
+ xc_dom_set_gnttab_entry(xch, addr, GNTTAB_RESERVED_CONSOLE,
+ guest_domid, console_domid, console_gmfn);
+ xc_dom_set_gnttab_entry(xch, addr, GNTTAB_RESERVED_XENSTORE,
+ guest_domid, xenstore_domid, xenstore_gmfn);
+
+ xenforeignmemory_unmap_resource(fmem, fres);
+
+ return 0;
+}
+
+int xc_dom_gnttab_init(struct xc_dom_image *dom)
+{
+ xc_interface *xch = dom->xch;
+ domid_t guest_domid = dom->guest_domid;
+ bool is_hvm = xc_dom_translated(dom);
+ xen_pfn_t console_gmfn = xc_dom_p2m(dom, dom->console_pfn);
+ xen_pfn_t xenstore_gmfn = xc_dom_p2m(dom, dom->xenstore_pfn);
+ domid_t console_domid = dom->console_domid;
+ domid_t xenstore_domid = dom->xenstore_domid;
+
+ return xc_dom_gnttab_seed(xch, guest_domid, is_hvm,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid);
}
/*
@@ -207,11 +207,11 @@ static int x86_hvm_stream_complete(struct xc_sr_context *ctx)
return rc;
}
- rc = xc_dom_gnttab_hvm_seed(xch, ctx->domid,
- ctx->restore.console_gfn,
- ctx->restore.xenstore_gfn,
- ctx->restore.console_domid,
- ctx->restore.xenstore_domid);
+ rc = xc_dom_gnttab_seed(xch, ctx->domid, true,
+ ctx->restore.console_gfn,
+ ctx->restore.xenstore_gfn,
+ ctx->restore.console_domid,
+ ctx->restore.xenstore_domid);
if ( rc )
{
PERROR("Failed to seed grant table");
@@ -1104,7 +1104,7 @@ static int x86_pv_stream_complete(struct xc_sr_context *ctx)
if ( rc )
return rc;
- rc = xc_dom_gnttab_seed(xch, ctx->domid,
+ rc = xc_dom_gnttab_seed(xch, ctx->domid, false,
ctx->restore.console_gfn,
ctx->restore.xenstore_gfn,
ctx->restore.console_domid,
@@ -851,7 +851,6 @@ static int hvm_build_set_params(xc_interface *handle, uint32_t domid,
*store_mfn = str_mfn;
*console_mfn = cons_mfn;
- xc_dom_gnttab_hvm_seed(handle, domid, *console_mfn, *store_mfn, console_domid, store_domid);
return 0;
}
@@ -800,9 +800,9 @@ static PyObject *pyxc_gnttab_hvm_seed(XcObject *self,
&console_domid, &xenstore_domid) )
return NULL;
- if ( xc_dom_gnttab_hvm_seed(self->xc_handle, dom,
- console_gmfn, xenstore_gmfn,
- console_domid, xenstore_domid) != 0 )
+ if ( xc_dom_gnttab_seed(self->xc_handle, dom, true,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid) != 0 )
return pyxc_error_to_exception(self->xc_handle);
return Py_None;
A previous patch added support for priv-mapping guest resources directly (rather than having to foreign-map, which requires P2M modification for HVM guests). This patch makes use of the new API to seed the guest grant table unless the underlying infrastructure (i.e. privcmd) doesn't support it, in which case the old scheme is used. NOTE: The call to xc_dom_gnttab_hvm_seed() in hvm_build_set_params() was actually unnecessary, as the grant table has already been seeded by a prior call to xc_dom_gnttab_init() made by libxl__build_dom(). Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> --- Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Wei Liu <wei.liu2@citrix.com> v3: - Introduced xc_dom_set_gnttab_entry() to avoid duplicated code. --- tools/libxc/include/xc_dom.h | 8 +-- tools/libxc/xc_dom_boot.c | 118 ++++++++++++++++++++++++++---------- tools/libxc/xc_sr_restore_x86_hvm.c | 10 +-- tools/libxc/xc_sr_restore_x86_pv.c | 2 +- tools/libxl/libxl_dom.c | 1 - tools/python/xen/lowlevel/xc/xc.c | 6 +- 6 files changed, 96 insertions(+), 49 deletions(-)