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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] libxl: arm: Add grant_usage parameter for virtio devices
commit c14254065ff4826e34f714e1790eab5217368c38
Author: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
AuthorDate: Mon Jul 24 14:11:35 2023 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 24 14:11:35 2023 +0200
libxl: arm: Add grant_usage parameter for virtio devices
Currently, the grant mapping related device tree properties are added if
the backend domain is not Dom0. While Dom0 is privileged and can do
foreign mapping for the entire guest memory, it is still desired for
Dom0 to access guest's memory via grant mappings and hence map only what
is required.
This commit adds the "grant_usage" parameter for virtio devices, which
provides better control over the functionality.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxx>
---
docs/man/xl.cfg.5.pod.in | 8 ++++++++
tools/golang/xenlight/helpers.gen.go | 6 ++++++
tools/golang/xenlight/types.gen.go | 1 +
tools/libs/light/libxl_arm.c | 22 +++++++++++++---------
tools/libs/light/libxl_types.idl | 1 +
tools/libs/light/libxl_virtio.c | 23 +++++++++++++++++++++--
tools/xl/xl_parse.c | 2 ++
7 files changed, 52 insertions(+), 11 deletions(-)
diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in
index 3979be2a59..b6fc20ef01 100644
--- a/docs/man/xl.cfg.5.pod.in
+++ b/docs/man/xl.cfg.5.pod.in
@@ -1619,6 +1619,14 @@ hexadecimal format, without the "0x" prefix and all in
lower case, like
Specifies the transport mechanism for the Virtio device, only "mmio" is
supported for now.
+=item B<grant_usage=BOOLEAN>
+
+If this option is B<true>, the Xen grants are always enabled.
+If this option is B<false>, the Xen grants are always disabled.
+
+If this option is missing, then the default grant setting will be used,
+i.e. enable grants if backend-domid != 0.
+
=back
=item B<tee="STRING">
diff --git a/tools/golang/xenlight/helpers.gen.go
b/tools/golang/xenlight/helpers.gen.go
index cd1a16e32e..3ecffdf0ef 100644
--- a/tools/golang/xenlight/helpers.gen.go
+++ b/tools/golang/xenlight/helpers.gen.go
@@ -1794,6 +1794,9 @@ func (x *DeviceVirtio) fromC(xc *C.libxl_device_virtio)
error {
x.BackendDomname = C.GoString(xc.backend_domname)
x.Type = C.GoString(xc._type)
x.Transport = VirtioTransport(xc.transport)
+if err := x.GrantUsage.fromC(&xc.grant_usage);err != nil {
+return fmt.Errorf("converting field GrantUsage: %v", err)
+}
x.Devid = Devid(xc.devid)
x.Irq = uint32(xc.irq)
x.Base = uint64(xc.base)
@@ -1811,6 +1814,9 @@ xc.backend_domname = C.CString(x.BackendDomname)}
if x.Type != "" {
xc._type = C.CString(x.Type)}
xc.transport = C.libxl_virtio_transport(x.Transport)
+if err := x.GrantUsage.toC(&xc.grant_usage); err != nil {
+return fmt.Errorf("converting field GrantUsage: %v", err)
+}
xc.devid = C.libxl_devid(x.Devid)
xc.irq = C.uint32_t(x.Irq)
xc.base = C.uint64_t(x.Base)
diff --git a/tools/golang/xenlight/types.gen.go
b/tools/golang/xenlight/types.gen.go
index b131a7eedc..4f40aac28c 100644
--- a/tools/golang/xenlight/types.gen.go
+++ b/tools/golang/xenlight/types.gen.go
@@ -706,6 +706,7 @@ BackendDomid Domid
BackendDomname string
Type string
Transport VirtioTransport
+GrantUsage Defbool
Devid Devid
Irq uint32
Base uint64
diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c
index 35f76dfc21..f98e1affa2 100644
--- a/tools/libs/light/libxl_arm.c
+++ b/tools/libs/light/libxl_arm.c
@@ -930,7 +930,8 @@ static int make_xen_iommu_node(libxl__gc *gc, void *fdt)
/* The caller is responsible to complete / close the fdt node */
static int make_virtio_mmio_node_common(libxl__gc *gc, void *fdt, uint64_t
base,
- uint32_t irq, uint32_t backend_domid)
+ uint32_t irq, uint32_t backend_domid,
+ bool grant_usage)
{
int res;
gic_interrupt intr;
@@ -953,7 +954,7 @@ static int make_virtio_mmio_node_common(libxl__gc *gc, void
*fdt, uint64_t base,
res = fdt_property(fdt, "dma-coherent", NULL, 0);
if (res) return res;
- if (backend_domid != LIBXL_TOOLSTACK_DOMID) {
+ if (grant_usage) {
uint32_t iommus_prop[2];
iommus_prop[0] = cpu_to_fdt32(GUEST_PHANDLE_IOMMU);
@@ -967,11 +968,12 @@ static int make_virtio_mmio_node_common(libxl__gc *gc,
void *fdt, uint64_t base,
}
static int make_virtio_mmio_node(libxl__gc *gc, void *fdt, uint64_t base,
- uint32_t irq, uint32_t backend_domid)
+ uint32_t irq, uint32_t backend_domid,
+ bool grant_usage)
{
int res;
- res = make_virtio_mmio_node_common(gc, fdt, base, irq, backend_domid);
+ res = make_virtio_mmio_node_common(gc, fdt, base, irq, backend_domid,
grant_usage);
if (res) return res;
return fdt_end_node(fdt);
@@ -1027,11 +1029,11 @@ static int make_virtio_mmio_node_gpio(libxl__gc *gc,
void *fdt)
static int make_virtio_mmio_node_device(libxl__gc *gc, void *fdt, uint64_t
base,
uint32_t irq, const char *type,
- uint32_t backend_domid)
+ uint32_t backend_domid, bool
grant_usage)
{
int res;
- res = make_virtio_mmio_node_common(gc, fdt, base, irq, backend_domid);
+ res = make_virtio_mmio_node_common(gc, fdt, base, irq, backend_domid,
grant_usage);
if (res) return res;
/* Add device specific nodes */
@@ -1371,7 +1373,8 @@ next_resize:
iommu_needed = true;
FDT( make_virtio_mmio_node(gc, fdt, disk->base, disk->irq,
- disk->backend_domid) );
+ disk->backend_domid,
+ disk->backend_domid !=
LIBXL_TOOLSTACK_DOMID) );
}
}
@@ -1381,12 +1384,13 @@ next_resize:
if (virtio->transport != LIBXL_VIRTIO_TRANSPORT_MMIO)
continue;
- if (virtio->backend_domid != LIBXL_TOOLSTACK_DOMID)
+ if (libxl_defbool_val(virtio->grant_usage))
iommu_needed = true;
FDT( make_virtio_mmio_node_device(gc, fdt, virtio->base,
virtio->irq, virtio->type,
- virtio->backend_domid) );
+ virtio->backend_domid,
+
libxl_defbool_val(virtio->grant_usage)) );
}
/*
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index 9e48bb7726..700b44a164 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -762,6 +762,7 @@ libxl_device_virtio = Struct("device_virtio", [
("backend_domname", string),
("type", string),
("transport", libxl_virtio_transport),
+ ("grant_usage", libxl_defbool),
("devid", libxl_devid),
# Note that virtio-mmio parameters (irq and base) are for internal
# use by libxl and can't be modified.
diff --git a/tools/libs/light/libxl_virtio.c b/tools/libs/light/libxl_virtio.c
index f8a78e22d1..e5e321adc5 100644
--- a/tools/libs/light/libxl_virtio.c
+++ b/tools/libs/light/libxl_virtio.c
@@ -23,8 +23,16 @@ static int libxl__device_virtio_setdefault(libxl__gc *gc,
uint32_t domid,
libxl_device_virtio *virtio,
bool hotplug)
{
- return libxl__resolve_domid(gc, virtio->backend_domname,
- &virtio->backend_domid);
+ int rc;
+
+ rc = libxl__resolve_domid(gc, virtio->backend_domname,
+ &virtio->backend_domid);
+ if (rc < 0) return rc;
+
+ libxl_defbool_setdefault(&virtio->grant_usage,
+ virtio->backend_domid != LIBXL_TOOLSTACK_DOMID);
+
+ return 0;
}
static int libxl__device_from_virtio(libxl__gc *gc, uint32_t domid,
@@ -53,6 +61,8 @@ static int libxl__set_xenstore_virtio(libxl__gc *gc, uint32_t
domid,
flexarray_append_pair(back, "base", GCSPRINTF("%#"PRIx64, virtio->base));
flexarray_append_pair(back, "type", GCSPRINTF("%s", virtio->type));
flexarray_append_pair(back, "transport", GCSPRINTF("%s", transport));
+ flexarray_append_pair(back, "grant_usage",
+ libxl_defbool_val(virtio->grant_usage) ? "1" : "0");
return 0;
}
@@ -104,6 +114,15 @@ static int libxl__virtio_from_xenstore(libxl__gc *gc,
const char *libxl_path,
}
}
+ tmp = NULL;
+ rc = libxl__xs_read_checked(gc, XBT_NULL,
+ GCSPRINTF("%s/grant_usage", be_path), &tmp);
+ if (rc) goto out;
+
+ if (tmp) {
+ libxl_defbool_set(&virtio->grant_usage, strtoul(tmp, NULL, 0));
+ }
+
tmp = NULL;
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/type", be_path), &tmp);
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index f036e56fc2..dfd432ca02 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -1215,6 +1215,8 @@ static int parse_virtio_config(libxl_device_virtio
*virtio, char *token)
} else if (MATCH_OPTION("transport", token, oparg)) {
rc = libxl_virtio_transport_from_string(oparg, &virtio->transport);
if (rc) return rc;
+ } else if (MATCH_OPTION("grant_usage", token, oparg)) {
+ libxl_defbool_set(&virtio->grant_usage, strtoul(oparg, NULL, 0));
} else {
fprintf(stderr, "Unknown string \"%s\" in virtio spec\n", token);
return -1;
--
generated by git-patchbot for /home/xen/git/xen.git#master
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