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[src/netbsd-9]: src/sys Pull up following revision(s) (requested by maxv in t...
details: https://anonhg.NetBSD.org/src/rev/02cafb24cf58
branches: netbsd-9
changeset: 964041:02cafb24cf58
user: martin <martin%NetBSD.org@localhost>
date: Sun Aug 02 08:49:08 2020 +0000
description:
Pull up following revision(s) (requested by maxv in ticket #1032):
sys/dev/nvmm/x86/nvmm_x86_vmx.c: revision 1.60 (patch)
sys/dev/nvmm/x86/nvmm_x86_vmx.c: revision 1.61 (patch)
sys/dev/nvmm/nvmm.c: revision 1.30
sys/dev/nvmm/nvmm.c: revision 1.31
sys/dev/nvmm/nvmm.c: revision 1.32
sys/dev/nvmm/nvmm_internal.h: revision 1.15
sys/dev/nvmm/nvmm_internal.h: revision 1.16
sys/dev/nvmm/files.nvmm: revision 1.3
sys/dev/nvmm/x86/nvmm_x86_svm.c: revision 1.62 (patch)
sys/dev/nvmm/x86/nvmm_x86_svm.c: revision 1.63 (patch)
sys/dev/nvmm/x86/nvmm_x86_vmx.c: revision 1.59 (patch)
sys/modules/nvmm/nvmm.ioconf: revision 1.2
Gather the conditions to return from the VCPU loops in nvmm_return_needed(),
and use it in nvmm_do_vcpu_run() as well. This fixes two undesired behaviors:
- When a VM initializes, the many nested page faults that need processing
could cause the calling thread to occupy the CPU too much if we're unlucky
and are only getting repeated nested page faults thousands of times in a
row.
- When the emulator calls nvmm_vcpu_run() and immediately sends a signal to
stop the VCPU, it's better to check signals earlier and leave right away,
rather than doing a round of VCPU run that could increase the time spent
by the emulator waiting for the return.
style
Register NVMM as an actual pseudo-device. Without PMF handler, to
explicitly disallow ACPI suspend if NVMM is running.
Should fix PR/55406.
Print the backend name when attaching.
diffstat:
sys/dev/nvmm/files.nvmm | 4 +-
sys/dev/nvmm/nvmm.c | 171 ++++++++++++++++++++++++++++++---------
sys/dev/nvmm/nvmm_internal.h | 17 +++-
sys/dev/nvmm/x86/nvmm_x86_svm.c | 13 +--
sys/dev/nvmm/x86/nvmm_x86_vmx.c | 15 +--
sys/modules/nvmm/nvmm.ioconf | 3 +-
6 files changed, 160 insertions(+), 63 deletions(-)
diffs (truncated from 407 to 300 lines):
diff -r eeeaafa67d9d -r 02cafb24cf58 sys/dev/nvmm/files.nvmm
--- a/sys/dev/nvmm/files.nvmm Sun Aug 02 07:49:46 2020 +0000
+++ b/sys/dev/nvmm/files.nvmm Sun Aug 02 08:49:08 2020 +0000
@@ -1,6 +1,6 @@
-# $NetBSD: files.nvmm,v 1.2 2019/03/28 19:00:40 maxv Exp $
+# $NetBSD: files.nvmm,v 1.2.6.1 2020/08/02 08:49:08 martin Exp $
-defpseudo nvmm
+defpseudodev nvmm
file dev/nvmm/nvmm.c nvmm
diff -r eeeaafa67d9d -r 02cafb24cf58 sys/dev/nvmm/nvmm.c
--- a/sys/dev/nvmm/nvmm.c Sun Aug 02 07:49:46 2020 +0000
+++ b/sys/dev/nvmm/nvmm.c Sun Aug 02 08:49:08 2020 +0000
@@ -1,7 +1,7 @@
-/* $NetBSD: nvmm.c,v 1.22.2.4 2020/05/21 10:52:58 martin Exp $ */
+/* $NetBSD: nvmm.c,v 1.22.2.5 2020/08/02 08:49:08 martin Exp $ */
/*
- * Copyright (c) 2018-2019 The NetBSD Foundation, Inc.
+ * Copyright (c) 2018-2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvmm.c,v 1.22.2.4 2020/05/21 10:52:58 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvmm.c,v 1.22.2.5 2020/08/02 08:49:08 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -44,7 +44,7 @@
#include <sys/mman.h>
#include <sys/file.h>
#include <sys/filedesc.h>
-#include <sys/kauth.h>
+#include <sys/device.h>
#include <uvm/uvm.h>
#include <uvm/uvm_page.h>
@@ -570,11 +570,19 @@
int ret;
while (1) {
+ /* Got a signal? Or pending resched? Leave. */
+ if (__predict_false(nvmm_return_needed())) {
+ exit->reason = NVMM_VCPU_EXIT_NONE;
+ return 0;
+ }
+
+ /* Run the VCPU. */
ret = (*nvmm_impl->vcpu_run)(mach, vcpu, exit);
if (__predict_false(ret != 0)) {
return ret;
}
+ /* Process nested page faults. */
if (__predict_true(exit->reason != NVMM_VCPU_EXIT_MEMORY)) {
break;
}
@@ -952,22 +960,27 @@
/* -------------------------------------------------------------------------- */
+static const struct nvmm_impl *
+nvmm_ident(void)
+{
+ size_t i;
+
+ for (i = 0; i < __arraycount(nvmm_impl_list); i++) {
+ if ((*nvmm_impl_list[i]->ident)())
+ return nvmm_impl_list[i];
+ }
+
+ return NULL;
+}
+
static int
nvmm_init(void)
{
size_t i, n;
- for (i = 0; i < __arraycount(nvmm_impl_list); i++) {
- if (!(*nvmm_impl_list[i]->ident)()) {
- continue;
- }
- nvmm_impl = nvmm_impl_list[i];
- break;
- }
- if (nvmm_impl == NULL) {
- printf("NVMM: CPU not supported\n");
+ nvmm_impl = nvmm_ident();
+ if (nvmm_impl == NULL)
return ENOTSUP;
- }
for (i = 0; i < NVMM_MAX_MACHINES; i++) {
machines[i].machid = i;
@@ -1161,6 +1174,54 @@
/* -------------------------------------------------------------------------- */
+static int nvmm_match(device_t, cfdata_t, void *);
+static void nvmm_attach(device_t, device_t, void *);
+static int nvmm_detach(device_t, int);
+
+extern struct cfdriver nvmm_cd;
+
+CFATTACH_DECL_NEW(nvmm, 0, nvmm_match, nvmm_attach, nvmm_detach, NULL);
+
+static struct cfdata nvmm_cfdata[] = {
+ {
+ .cf_name = "nvmm",
+ .cf_atname = "nvmm",
+ .cf_unit = 0,
+ .cf_fstate = FSTATE_STAR,
+ .cf_loc = NULL,
+ .cf_flags = 0,
+ .cf_pspec = NULL,
+ },
+ { NULL, NULL, 0, FSTATE_NOTFOUND, NULL, 0, NULL }
+};
+
+static int
+nvmm_match(device_t self, cfdata_t cfdata, void *arg)
+{
+ return 1;
+}
+
+static void
+nvmm_attach(device_t parent, device_t self, void *aux)
+{
+ int error;
+
+ error = nvmm_init();
+ if (error)
+ panic("%s: impossible", __func__);
+ aprint_normal_dev(self, "attached, using backend %s\n",
+ nvmm_impl->name);
+}
+
+static int
+nvmm_detach(device_t self, int flags)
+{
+ if (nmachines > 0)
+ return EBUSY;
+ nvmm_fini();
+ return 0;
+}
+
void
nvmmattach(int nunits)
{
@@ -1169,51 +1230,83 @@
MODULE(MODULE_CLASS_MISC, nvmm, NULL);
+#if defined(_MODULE)
+CFDRIVER_DECL(nvmm, DV_VIRTUAL, NULL);
+#endif
+
static int
nvmm_modcmd(modcmd_t cmd, void *arg)
{
+#if defined(_MODULE)
+ devmajor_t bmajor = NODEVMAJOR;
+ devmajor_t cmajor = 345;
+#endif
int error;
switch (cmd) {
case MODULE_CMD_INIT:
- error = nvmm_init();
+ if (nvmm_ident() == NULL) {
+ aprint_error("%s: cpu not supported\n",
+ nvmm_cd.cd_name);
+ return ENOTSUP;
+ }
+#if defined(_MODULE)
+ error = config_cfdriver_attach(&nvmm_cd);
if (error)
return error;
+#endif
+ error = config_cfattach_attach(nvmm_cd.cd_name, &nvmm_ca);
+ if (error) {
+ config_cfdriver_detach(&nvmm_cd);
+ aprint_error("%s: config_cfattach_attach failed\n",
+ nvmm_cd.cd_name);
+ return error;
+ }
+
+ error = config_cfdata_attach(nvmm_cfdata, 1);
+ if (error) {
+ config_cfattach_detach(nvmm_cd.cd_name, &nvmm_ca);
+ config_cfdriver_detach(&nvmm_cd);
+ aprint_error("%s: unable to register cfdata\n",
+ nvmm_cd.cd_name);
+ return error;
+ }
+
+ if (config_attach_pseudo(nvmm_cfdata) == NULL) {
+ aprint_error("%s: config_attach_pseudo failed\n",
+ nvmm_cd.cd_name);
+ config_cfattach_detach(nvmm_cd.cd_name, &nvmm_ca);
+ config_cfdriver_detach(&nvmm_cd);
+ return ENXIO;
+ }
#if defined(_MODULE)
- {
- devmajor_t bmajor = NODEVMAJOR;
- devmajor_t cmajor = 345;
-
- /* mknod /dev/nvmm c 345 0 */
- error = devsw_attach("nvmm", NULL, &bmajor,
- &nvmm_cdevsw, &cmajor);
- if (error) {
- nvmm_fini();
- return error;
- }
+ /* mknod /dev/nvmm c 345 0 */
+ error = devsw_attach(nvmm_cd.cd_name, NULL, &bmajor,
+ &nvmm_cdevsw, &cmajor);
+ if (error) {
+ aprint_error("%s: unable to register devsw\n",
+ nvmm_cd.cd_name);
+ config_cfattach_detach(nvmm_cd.cd_name, &nvmm_ca);
+ config_cfdriver_detach(&nvmm_cd);
+ return error;
}
#endif
return 0;
-
case MODULE_CMD_FINI:
- if (nmachines > 0) {
- return EBUSY;
- }
+ error = config_cfdata_detach(nvmm_cfdata);
+ if (error)
+ return error;
+ error = config_cfattach_detach(nvmm_cd.cd_name, &nvmm_ca);
+ if (error)
+ return error;
#if defined(_MODULE)
- {
- error = devsw_detach(NULL, &nvmm_cdevsw);
- if (error) {
- return error;
- }
- }
+ config_cfdriver_detach(&nvmm_cd);
+ devsw_detach(NULL, &nvmm_cdevsw);
#endif
- nvmm_fini();
return 0;
-
case MODULE_CMD_AUTOUNLOAD:
return EBUSY;
-
default:
return ENOTTY;
}
diff -r eeeaafa67d9d -r 02cafb24cf58 sys/dev/nvmm/nvmm_internal.h
--- a/sys/dev/nvmm/nvmm_internal.h Sun Aug 02 07:49:46 2020 +0000
+++ b/sys/dev/nvmm/nvmm_internal.h Sun Aug 02 08:49:08 2020 +0000
@@ -1,7 +1,7 @@
-/* $NetBSD: nvmm_internal.h,v 1.12.2.2 2020/05/13 12:21:56 martin Exp $ */
+/* $NetBSD: nvmm_internal.h,v 1.12.2.3 2020/08/02 08:49:08 martin Exp $ */
/*
- * Copyright (c) 2018-2019 The NetBSD Foundation, Inc.
+ * Copyright (c) 2018-2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
@@ -91,6 +91,7 @@
};
struct nvmm_impl {
+ const char *name;
bool (*ident)(void);
void (*init)(void);
void (*fini)(void);
@@ -121,4 +122,16 @@
extern const struct nvmm_impl nvmm_x86_svm;
extern const struct nvmm_impl nvmm_x86_vmx;
+static inline bool
+nvmm_return_needed(void)
+{
+ if (preempt_needed()) {
+ return true;
+ }
+ if (curlwp->l_flag & LW_USERRET) {
+ return true;
+ }
+ return false;
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