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[src/trunk]: src/sys/arch Change the way SVS is disabled. Now you have to pas...
details: https://anonhg.NetBSD.org/src/rev/cb4b496e86b9
branches: trunk
changeset: 451317:cb4b496e86b9
user: maxv <maxv%NetBSD.org@localhost>
date: Wed May 15 17:31:41 2019 +0000
description:
Change the way SVS is disabled. Now you have to pass "boot -3" from the
bootloader. The machdep.svs.enabled sysctl becomes read-only, and just
indicates whether SVS is enabled.
Sent on port-amd64@.
diffstat:
sys/arch/amd64/amd64/locore.S | 30 +-------
sys/arch/x86/x86/svs.c | 151 +---------------------------------------
sys/arch/x86/x86/x86_machdep.c | 9 +-
3 files changed, 12 insertions(+), 178 deletions(-)
diffs (278 lines):
diff -r 4f0aa47fb14c -r cb4b496e86b9 sys/arch/amd64/amd64/locore.S
--- a/sys/arch/amd64/amd64/locore.S Wed May 15 16:59:10 2019 +0000
+++ b/sys/arch/amd64/amd64/locore.S Wed May 15 17:31:41 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: locore.S,v 1.181 2019/05/14 16:59:25 maxv Exp $ */
+/* $NetBSD: locore.S,v 1.182 2019/05/15 17:31:41 maxv Exp $ */
/*
* Copyright-o-rama!
@@ -1621,10 +1621,6 @@
.globl svs_enter_altstack, svs_enter_altstack_end
.globl svs_leave, svs_leave_end
.globl svs_leave_altstack, svs_leave_altstack_end
- .globl nosvs_enter, nosvs_enter_end
- .globl nosvs_enter_altstack, nosvs_enter_altstack_end
- .globl nosvs_leave, nosvs_leave_end
- .globl nosvs_leave_altstack, nosvs_leave_altstack_end
LABEL(svs_enter)
movabs SVS_UTLS+UTLS_KPDIRPA,%rax
@@ -1668,30 +1664,6 @@
movq (FRAMESIZE+1*8)(%rsp),%rax /* nmistore->scratch */
movq %rax,%cr3
LABEL(svs_leave_nmi_end)
-
-LABEL(nosvs_enter)
- NOSVS_ENTER
-LABEL(nosvs_enter_end)
-
-LABEL(nosvs_enter_altstack)
- NOSVS_ENTER_ALTSTACK
-LABEL(nosvs_enter_altstack_end)
-
-LABEL(nosvs_enter_nmi)
- NOSVS_ENTER_NMI
-LABEL(nosvs_enter_nmi_end)
-
-LABEL(nosvs_leave)
- NOSVS_LEAVE
-LABEL(nosvs_leave_end)
-
-LABEL(nosvs_leave_altstack)
- NOSVS_LEAVE_ALTSTACK
-LABEL(nosvs_leave_altstack_end)
-
-LABEL(nosvs_leave_nmi)
- NOSVS_LEAVE_NMI
-LABEL(nosvs_leave_nmi_end)
#endif
.globl ibrs_enter, ibrs_enter_end
diff -r 4f0aa47fb14c -r cb4b496e86b9 sys/arch/x86/x86/svs.c
--- a/sys/arch/x86/x86/svs.c Wed May 15 16:59:10 2019 +0000
+++ b/sys/arch/x86/x86/svs.c Wed May 15 17:31:41 2019 +0000
@@ -1,7 +1,7 @@
-/* $NetBSD: svs.c,v 1.25 2019/04/21 06:37:21 maxv Exp $ */
+/* $NetBSD: svs.c,v 1.26 2019/05/15 17:31:41 maxv Exp $ */
/*
- * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * Copyright (c) 2018-2019 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: svs.c,v 1.25 2019/04/21 06:37:21 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: svs.c,v 1.26 2019/05/15 17:31:41 maxv Exp $");
#include "opt_svs.h"
@@ -41,6 +41,7 @@
#include <sys/kauth.h>
#include <sys/sysctl.h>
#include <sys/xcall.h>
+#include <sys/reboot.h>
#include <x86/cputypes.h>
#include <machine/cpuvar.h>
@@ -611,147 +612,6 @@
x86_patch_window_close(psl, cr0);
}
-static void
-svs_disable_hotpatch(void)
-{
- extern uint8_t nosvs_enter, nosvs_enter_end;
- extern uint8_t nosvs_enter_altstack, nosvs_enter_altstack_end;
- extern uint8_t nosvs_enter_nmi, nosvs_enter_nmi_end;
- extern uint8_t nosvs_leave, nosvs_leave_end;
- extern uint8_t nosvs_leave_altstack, nosvs_leave_altstack_end;
- extern uint8_t nosvs_leave_nmi, nosvs_leave_nmi_end;
- u_long psl, cr0;
- uint8_t *bytes;
- size_t size;
-
- x86_patch_window_open(&psl, &cr0);
-
- bytes = &nosvs_enter;
- size = (size_t)&nosvs_enter_end - (size_t)&nosvs_enter;
- x86_hotpatch(HP_NAME_SVS_ENTER, bytes, size);
-
- bytes = &nosvs_enter_altstack;
- size = (size_t)&nosvs_enter_altstack_end -
- (size_t)&nosvs_enter_altstack;
- x86_hotpatch(HP_NAME_SVS_ENTER_ALT, bytes, size);
-
- bytes = &nosvs_enter_nmi;
- size = (size_t)&nosvs_enter_nmi_end -
- (size_t)&nosvs_enter_nmi;
- x86_hotpatch(HP_NAME_SVS_ENTER_NMI, bytes, size);
-
- bytes = &nosvs_leave;
- size = (size_t)&nosvs_leave_end - (size_t)&nosvs_leave;
- x86_hotpatch(HP_NAME_SVS_LEAVE, bytes, size);
-
- bytes = &nosvs_leave_altstack;
- size = (size_t)&nosvs_leave_altstack_end -
- (size_t)&nosvs_leave_altstack;
- x86_hotpatch(HP_NAME_SVS_LEAVE_ALT, bytes, size);
-
- bytes = &nosvs_leave_nmi;
- size = (size_t)&nosvs_leave_nmi_end -
- (size_t)&nosvs_leave_nmi;
- x86_hotpatch(HP_NAME_SVS_LEAVE_NMI, bytes, size);
-
- x86_patch_window_close(psl, cr0);
-}
-
-static volatile unsigned long svs_cpu_barrier1 __cacheline_aligned;
-static volatile unsigned long svs_cpu_barrier2 __cacheline_aligned;
-typedef void (vector)(void);
-
-static void
-svs_disable_cpu(void *arg1, void *arg2)
-{
- struct cpu_info *ci = curcpu();
- extern vector Xsyscall;
- u_long psl;
-
- psl = x86_read_psl();
- x86_disable_intr();
-
- atomic_dec_ulong(&svs_cpu_barrier1);
- while (atomic_cas_ulong(&svs_cpu_barrier1, 0, 0) != 0) {
- x86_pause();
- }
-
- /* cpu0 is the one that does the hotpatch job */
- if (ci == &cpu_info_primary) {
- svs_enabled = false;
- svs_disable_hotpatch();
- }
-
- /* put back the non-SVS syscall entry point */
- wrmsr(MSR_LSTAR, (uint64_t)Xsyscall);
-
- /* enable global pages */
- if (cpu_feature[0] & CPUID_PGE)
- lcr4(rcr4() | CR4_PGE);
-
- atomic_dec_ulong(&svs_cpu_barrier2);
- while (atomic_cas_ulong(&svs_cpu_barrier2, 0, 0) != 0) {
- x86_pause();
- }
-
- /* Write back and invalidate cache, flush pipelines. */
- wbinvd();
- x86_flush();
-
- x86_write_psl(psl);
-}
-
-static int
-svs_disable(void)
-{
- uint64_t xc;
-
- svs_cpu_barrier1 = ncpu;
- svs_cpu_barrier2 = ncpu;
-
- printf("[+] Disabling SVS...");
- xc = xc_broadcast(0, svs_disable_cpu, NULL, NULL);
- xc_wait(xc);
- printf(" done!\n");
-
- return 0;
-}
-
-int sysctl_machdep_svs_enabled(SYSCTLFN_ARGS);
-
-int
-sysctl_machdep_svs_enabled(SYSCTLFN_ARGS)
-{
- struct sysctlnode node;
- int error;
- bool val;
-
- val = *(bool *)rnode->sysctl_data;
-
- node = *rnode;
- node.sysctl_data = &val;
-
- error = sysctl_lookup(SYSCTLFN_CALL(&node));
- if (error != 0 || newp == NULL)
- return error;
-
- if (val == 1) {
- if (svs_enabled)
- error = 0;
- else
- error = EOPNOTSUPP;
- } else if (svs_enabled) {
- error = kauth_authorize_machdep(kauth_cred_get(),
- KAUTH_MACHDEP_SVS_DISABLE, NULL, NULL, NULL, NULL);
- if (!error)
- error = svs_disable();
- } else {
- error = 0;
- }
-
- return error;
-}
-
void
svs_init(void)
{
@@ -760,6 +620,9 @@
if (cpu_vendor != CPUVENDOR_INTEL) {
return;
}
+ if (boothowto & RB_MD3) {
+ return;
+ }
if (cpu_info_primary.ci_feat_val[7] & CPUID_SEF_ARCH_CAP) {
msr = rdmsr(MSR_IA32_ARCH_CAPABILITIES);
if (msr & IA32_ARCH_RDCL_NO) {
diff -r 4f0aa47fb14c -r cb4b496e86b9 sys/arch/x86/x86/x86_machdep.c
--- a/sys/arch/x86/x86/x86_machdep.c Wed May 15 16:59:10 2019 +0000
+++ b/sys/arch/x86/x86/x86_machdep.c Wed May 15 17:31:41 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: x86_machdep.c,v 1.124 2019/02/15 08:54:01 nonaka Exp $ */
+/* $NetBSD: x86_machdep.c,v 1.125 2019/05/15 17:31:41 maxv Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007 YAMAMOTO Takashi,
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.124 2019/02/15 08:54:01 nonaka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.125 2019/05/15 17:31:41 maxv Exp $");
#include "opt_modular.h"
#include "opt_physmem.h"
@@ -1287,7 +1287,6 @@
sysctl_machdep_hypervisor, 0, NULL, 0,
CTL_MACHDEP, CTL_CREATE, CTL_EOL);
#ifdef SVS
- int sysctl_machdep_svs_enabled(SYSCTLFN_ARGS);
const struct sysctlnode *svs_rnode = NULL;
sysctl_createv(clog, 0, NULL, &svs_rnode,
CTLFLAG_PERMANENT,
@@ -1295,10 +1294,10 @@
NULL, 0, NULL, 0,
CTL_MACHDEP, CTL_CREATE);
sysctl_createv(clog, 0, &svs_rnode, &svs_rnode,
- CTLFLAG_READWRITE,
+ CTLFLAG_PERMANENT,
CTLTYPE_BOOL, "enabled",
SYSCTL_DESCR("Whether the kernel uses SVS"),
- sysctl_machdep_svs_enabled, 0, &svs_enabled, 0,
+ NULL, 0, &svs_enabled, 0,
CTL_CREATE, CTL_EOL);
#endif
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