Source-Changes-HG archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
[src/trunk]: src Stop taking care of the INT/NMI windows in the kernel, the e...
details: https://anonhg.NetBSD.org/src/rev/851e5fbee6a2
branches: trunk
changeset: 456254:851e5fbee6a2
user: maxv <maxv%NetBSD.org@localhost>
date: Mon Apr 29 18:54:25 2019 +0000
description:
Stop taking care of the INT/NMI windows in the kernel, the emulator is
supposed to do that itself.
diffstat:
doc/TODO.nvmm | 4 ----
lib/libnvmm/libnvmm.3 | 22 +++++++---------------
sys/dev/nvmm/x86/nvmm_x86_svm.c | 15 ++-------------
sys/dev/nvmm/x86/nvmm_x86_vmx.c | 34 +++++++---------------------------
4 files changed, 16 insertions(+), 59 deletions(-)
diffs (179 lines):
diff -r cbb93869ccf2 -r 851e5fbee6a2 doc/TODO.nvmm
--- a/doc/TODO.nvmm Mon Apr 29 17:27:57 2019 +0000
+++ b/doc/TODO.nvmm Mon Apr 29 18:54:25 2019 +0000
@@ -10,10 +10,6 @@
On Intel that's not complicated, but on old AMD CPUs, we need to disassemble
the instruction, and I don't like that.
- * Maybe we shouldn't modify the INT/NMI windows during event injection. The
- virtualizer is supposed to inject the event only when these windows allow
- it. (Eg Qemu does.)
-
* We need a cleaner way to handle CPUID exits. It is not complicated to solve,
but I'm still not sure which design is the cleanest.
diff -r cbb93869ccf2 -r 851e5fbee6a2 lib/libnvmm/libnvmm.3
--- a/lib/libnvmm/libnvmm.3 Mon Apr 29 17:27:57 2019 +0000
+++ b/lib/libnvmm/libnvmm.3 Mon Apr 29 18:54:25 2019 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: libnvmm.3,v 1.14 2019/04/07 14:13:03 maxv Exp $
+.\" $NetBSD: libnvmm.3,v 1.15 2019/04/29 18:54:25 maxv Exp $
.\"
.\" Copyright (c) 2018, 2019 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -470,15 +470,15 @@
in-NMI context.
.El
.Pp
-In this case,
-.Fn nvmm_vcpu_inject
-will return
-.Er EAGAIN ,
-and NVMM will cause a VM exit with reason
+VMM software can manage interrupt and NMI window-exiting via the
+.Va intr
+component of the VCPU state.
+When such window-exiting is enabled, NVMM will cause a VM exit with reason
.Cd NVMM_EXIT_INT_READY
or
.Cd NVMM_EXIT_NMI_READY
-to indicate that VMM software can now reinject the desired event.
+to indicate that the guest is now able to handle the corresponding class
+of interrupts.
.Ss Assist Callbacks
In order to assist emulation of certain operations,
.Nm
@@ -633,14 +633,6 @@
.It Bq Er EPERM
An attempt was made to access a machine that does not belong to the process.
.El
-.Pp
-In addition,
-.Fn nvmm_vcpu_inject
-uses the following error codes:
-.Bl -tag -width [ENOBUFS]
-.It Bq Er EAGAIN
-The VCPU cannot receive the event immediately.
-.El
.Sh SEE ALSO
.Xr nvmm 4
.Sh AUTHORS
diff -r cbb93869ccf2 -r 851e5fbee6a2 sys/dev/nvmm/x86/nvmm_x86_svm.c
--- a/sys/dev/nvmm/x86/nvmm_x86_svm.c Mon Apr 29 17:27:57 2019 +0000
+++ b/sys/dev/nvmm/x86/nvmm_x86_svm.c Mon Apr 29 18:54:25 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: nvmm_x86_svm.c,v 1.43 2019/04/28 14:22:13 maxv Exp $ */
+/* $NetBSD: nvmm_x86_svm.c,v 1.44 2019/04/29 18:54:25 maxv Exp $ */
/*
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.43 2019/04/28 14:22:13 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.44 2019/04/29 18:54:25 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -677,18 +677,7 @@
type = SVM_EVENT_TYPE_HW_INT;
if (event->vector == 2) {
type = SVM_EVENT_TYPE_NMI;
- }
- if (type == SVM_EVENT_TYPE_NMI) {
- if (cpudata->nmi_window_exit) {
- return EAGAIN;
- }
svm_event_waitexit_enable(vcpu, true);
- } else {
- if (((vmcb->state.rflags & PSL_I) == 0) ||
- ((vmcb->ctrl.intr & VMCB_CTRL_INTR_SHADOW) != 0)) {
- svm_event_waitexit_enable(vcpu, false);
- return EAGAIN;
- }
}
err = 0;
break;
diff -r cbb93869ccf2 -r 851e5fbee6a2 sys/dev/nvmm/x86/nvmm_x86_vmx.c
--- a/sys/dev/nvmm/x86/nvmm_x86_vmx.c Mon Apr 29 17:27:57 2019 +0000
+++ b/sys/dev/nvmm/x86/nvmm_x86_vmx.c Mon Apr 29 18:54:25 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: nvmm_x86_vmx.c,v 1.31 2019/04/28 14:22:13 maxv Exp $ */
+/* $NetBSD: nvmm_x86_vmx.c,v 1.32 2019/04/29 18:54:26 maxv Exp $ */
/*
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_vmx.c,v 1.31 2019/04/28 14:22:13 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_vmx.c,v 1.32 2019/04/29 18:54:26 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -996,8 +996,8 @@
struct nvmm_event *event)
{
struct vmx_cpudata *cpudata = vcpu->cpudata;
- int type = 0, err = 0, ret = 0;
- uint64_t info, intstate, rflags;
+ int type = 0, err = 0, ret = EINVAL;
+ uint64_t info;
if (event->vector >= 256) {
return EINVAL;
@@ -1010,42 +1010,21 @@
type = INTR_TYPE_EXT_INT;
if (event->vector == 2) {
type = INTR_TYPE_NMI;
- }
- intstate = vmx_vmread(VMCS_GUEST_INTERRUPTIBILITY);
- if (type == INTR_TYPE_NMI) {
- if (cpudata->nmi_window_exit) {
- ret = EAGAIN;
- goto out;
- }
vmx_event_waitexit_enable(vcpu, true);
- } else {
- rflags = vmx_vmread(VMCS_GUEST_RFLAGS);
- if ((rflags & PSL_I) == 0 ||
- (intstate & (INT_STATE_STI|INT_STATE_MOVSS)) != 0) {
- vmx_event_waitexit_enable(vcpu, false);
- ret = EAGAIN;
- goto out;
- }
}
err = 0;
break;
case NVMM_EVENT_INTERRUPT_SW:
- ret = EINVAL;
goto out;
case NVMM_EVENT_EXCEPTION:
- if (event->vector == 2 || event->vector >= 32) {
- ret = EINVAL;
+ if (event->vector == 2 || event->vector >= 32)
goto out;
- }
- if (event->vector == 3 || event->vector == 0) {
- ret = EINVAL;
+ if (event->vector == 3 || event->vector == 0)
goto out;
- }
type = INTR_TYPE_HW_EXC;
err = vmx_event_has_error(event->vector);
break;
default:
- ret = EAGAIN;
goto out;
}
@@ -1058,6 +1037,7 @@
vmx_vmwrite(VMCS_ENTRY_EXCEPTION_ERROR, event->u.error);
cpudata->evt_pending = true;
+ ret = 0;
out:
vmx_vmcs_leave(vcpu);
Home |
Main Index |
Thread Index |
Old Index