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authorRoger Pau Monné <royger@FreeBSD.org>2021-02-12 12:11:34 +0000
committerRoger Pau Monné <royger@FreeBSD.org>2021-02-16 14:26:12 +0000
commit952667da986c8a38720eed5a9d0290de308b23d3 (patch)
tree5f9077da22a0b80b3406002e972075beba2f5d12
parent27d3902679cd6df6404cd402ffc85a9763c449b1 (diff)
downloadsrc-952667da986c8a38720eed5a9d0290de308b23d3.tar.gz
src-952667da986c8a38720eed5a9d0290de308b23d3.zip
xen/efi: introduce a PV interface for EFI run time services for dom0
FreeBSD when running as a dom0 under Xen is not supposed to access the run time services directly, and instead should proxy the calls through Xen using an hypercall interface that exposes access to selected run time services. Implement the efirt interface on top of the Xen provided hypercalls. Sponsored by: Citrix Systems R&D Reviewed by: kib Differential revision: https://reviews.freebsd.org/D28621
-rw-r--r--sys/conf/files1
-rw-r--r--sys/dev/xen/efi/pvefi.c255
2 files changed, 256 insertions, 0 deletions
diff --git a/sys/conf/files b/sys/conf/files
index 459fcddd693b..f1a76b0575d9 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -3534,6 +3534,7 @@ dev/xen/blkfront/blkfront.c optional xenhvm
dev/xen/blkback/blkback.c optional xenhvm
dev/xen/console/xen_console.c optional xenhvm
dev/xen/control/control.c optional xenhvm
+dev/xen/efi/pvefi.c optional xenhvm efirt
dev/xen/grant_table/grant_table.c optional xenhvm
dev/xen/netback/netback.c optional xenhvm
dev/xen/netfront/netfront.c optional xenhvm
diff --git a/sys/dev/xen/efi/pvefi.c b/sys/dev/xen/efi/pvefi.c
new file mode 100644
index 000000000000..65778b7bcee1
--- /dev/null
+++ b/sys/dev/xen/efi/pvefi.c
@@ -0,0 +1,255 @@
+/*-
+ * Copyright (c) 2021 Citrix Systems R&D
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/efi.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/linker.h>
+#include <sys/module.h>
+#include <sys/clock.h>
+#include <sys/sysctl.h>
+#include <sys/systm.h>
+
+#include <xen/xen-os.h>
+#include <xen/error.h>
+#include <xen/hypervisor.h>
+
+#include <xen/interface/platform.h>
+
+extern char bootmethod[16];
+
+static int
+rt_ok(void)
+{
+
+ return (0);
+}
+
+static int
+get_time(struct efi_tm *tm)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_get_time,
+ };
+ struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call;
+ int error;
+
+ error = HYPERVISOR_platform_op(&op);
+ if (error != 0)
+ return (xen_translate_error(error));
+
+ tm->tm_year = call->u.get_time.time.year;
+ tm->tm_mon = call->u.get_time.time.month;
+ tm->tm_mday = call->u.get_time.time.day;
+ tm->tm_hour = call->u.get_time.time.hour;
+ tm->tm_min = call->u.get_time.time.min;
+ tm->tm_sec = call->u.get_time.time.sec;
+ tm->tm_nsec = call->u.get_time.time.ns;
+ tm->tm_tz = call->u.get_time.time.tz;
+ tm->tm_dst = call->u.get_time.time.daylight;
+
+ return (efi_status_to_errno(call->status));
+}
+
+static int
+get_time_capabilities(struct efi_tmcap *tmcap)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_get_time,
+ };
+ struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call;
+ int error;
+
+ error = HYPERVISOR_platform_op(&op);
+ if (error != 0)
+ return (xen_translate_error(error));
+
+ tmcap->tc_res = call->u.get_time.resolution;
+ tmcap->tc_prec = call->u.get_time.accuracy;
+ tmcap->tc_stz = call->misc & XEN_EFI_GET_TIME_SET_CLEARS_NS;
+
+ return (efi_status_to_errno(call->status));
+}
+
+static int
+set_time(struct efi_tm *tm)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_get_time,
+ .u.efi_runtime_call.u.set_time.year = tm->tm_year,
+ .u.efi_runtime_call.u.set_time.month = tm->tm_mon,
+ .u.efi_runtime_call.u.set_time.day = tm->tm_mday,
+ .u.efi_runtime_call.u.set_time.hour = tm->tm_hour,
+ .u.efi_runtime_call.u.set_time.min = tm->tm_min,
+ .u.efi_runtime_call.u.set_time.sec = tm->tm_sec,
+ .u.efi_runtime_call.u.set_time.ns = tm->tm_nsec,
+ .u.efi_runtime_call.u.set_time.tz = tm->tm_tz,
+ .u.efi_runtime_call.u.set_time.daylight = tm->tm_dst,
+ };
+ int error;
+
+ error = HYPERVISOR_platform_op(&op);
+
+ return ((error != 0) ? xen_translate_error(error) :
+ efi_status_to_errno(op.u.efi_runtime_call.status));
+}
+
+static int
+var_get(efi_char *name, struct uuid *vendor, uint32_t *attrib,
+ size_t *datasize, void *data)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_get_variable,
+ .u.efi_runtime_call.u.get_variable.size = *datasize,
+ };
+ struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call;
+ int error;
+
+ CTASSERT(sizeof(*vendor) == sizeof(call->u.get_variable.vendor_guid));
+
+ memcpy(&call->u.get_variable.vendor_guid, vendor,
+ sizeof(*vendor));
+ set_xen_guest_handle(call->u.get_variable.name, name);
+ set_xen_guest_handle(call->u.get_variable.data, data);
+
+ error = HYPERVISOR_platform_op(&op);
+ if (error != 0)
+ return (xen_translate_error(error));
+
+ *attrib = call->misc;
+ *datasize = call->u.get_variable.size;
+
+ return (efi_status_to_errno(call->status));
+}
+
+static int
+var_nextname(size_t *namesize, efi_char *name, struct uuid *vendor)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_get_next_variable_name,
+ .u.efi_runtime_call.u.get_next_variable_name.size = *namesize,
+ };
+ struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call;
+ int error;
+
+ memcpy(&call->u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+ set_xen_guest_handle(call->u.get_next_variable_name.name, name);
+
+ error = HYPERVISOR_platform_op(&op);
+ if (error != 0)
+ return (xen_translate_error(error));
+
+ *namesize = call->u.get_next_variable_name.size;
+ memcpy(vendor, &call->u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return (efi_status_to_errno(call->status));
+}
+
+static int
+var_set(efi_char *name, struct uuid *vendor, uint32_t attrib,
+ size_t datasize, void *data)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_efi_runtime_call,
+ .u.efi_runtime_call.function = XEN_EFI_set_variable,
+ .u.efi_runtime_call.misc = attrib,
+ .u.efi_runtime_call.u.set_variable.size = datasize,
+ };
+ struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call;
+ int error;
+
+ memcpy(&call->u.set_variable.vendor_guid, vendor,
+ sizeof(*vendor));
+ set_xen_guest_handle(call->u.set_variable.name, name);
+ set_xen_guest_handle(call->u.set_variable.data, data);
+
+ error = HYPERVISOR_platform_op(&op);
+
+ return ((error != 0) ? xen_translate_error(error) :
+ efi_status_to_errno(call->status));
+}
+
+const static struct efi_ops pvefi_ops = {
+ .rt_ok = rt_ok,
+ .get_time = get_time,
+ .get_time_capabilities = get_time_capabilities,
+ .set_time = set_time,
+ .var_get = var_get,
+ .var_nextname = var_nextname,
+ .var_set = var_set,
+};
+
+static int
+modevents(module_t m, int event, void *arg __unused)
+{
+ const static struct efi_ops *prev;
+ int rt_disabled;
+
+ switch (event) {
+ case MOD_LOAD:
+ rt_disabled = 0;
+ TUNABLE_INT_FETCH("efi.rt.disabled", &rt_disabled);
+
+ if (!xen_initial_domain() || strcmp("UEFI", bootmethod) != 0 ||
+ rt_disabled == 1)
+ return (0);
+
+ prev = active_efi_ops;
+ active_efi_ops = &pvefi_ops;
+ return (0);
+
+ case MOD_UNLOAD:
+ if (prev != NULL)
+ active_efi_ops = prev;
+ return (0);
+
+ case MOD_SHUTDOWN:
+ return (0);
+
+ default:
+ return (EOPNOTSUPP);
+ }
+}
+
+static moduledata_t moddata = {
+ .name = "pvefirt",
+ .evhand = modevents,
+ .priv = NULL,
+};
+/* After fpuinitstate, before efidev */
+DECLARE_MODULE(pvefirt, moddata, SI_SUB_DRIVERS, SI_ORDER_SECOND);
+MODULE_VERSION(pvefirt, 1);