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Use XC_HIGHPRI for SpectreV2 to reduce the CPU downtime. We already do this 

for MDS.
This commit is contained in:
maxv 2019-05-18 08:54:38 +00:00
parent a0ac59c71f
commit d42d172475
1 changed files with 5 additions and 5 deletions
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10
sys/arch/x86/x86/spectre.c
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@ -1,7 +1,7 @@
/* $NetBSD: spectre.c,v 1.27 2019/05/14 16:59:26 maxv Exp $ */ /* $NetBSD: spectre.c,v 1.28 2019/05/18 08:54:38 maxv Exp $ */
/* /*
* Copyright (c) 2018 NetBSD Foundation, Inc. * Copyright (c) 2018-2019 NetBSD Foundation, Inc.
* All rights reserved. * All rights reserved.
* *
* This code is derived from software contributed to The NetBSD Foundation * This code is derived from software contributed to The NetBSD Foundation
@ -30,11 +30,11 @@
*/ */
/* /*
* Mitigations for the SpectreV2 and SpectreV4 CPU flaws. * Mitigations for the SpectreV2, SpectreV4 and MDS CPU flaws.
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.27 2019/05/14 16:59:26 maxv Exp $"); __KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.28 2019/05/18 08:54:38 maxv Exp $");
#include "opt_spectre.h" #include "opt_spectre.h"
@ -328,7 +328,7 @@ mitigation_v2_change(bool enabled)
printf("[+] %s SpectreV2 Mitigation...", printf("[+] %s SpectreV2 Mitigation...",
enabled ? "Enabling" : "Disabling"); enabled ? "Enabling" : "Disabling");
xc = xc_broadcast(0, mitigation_v2_change_cpu, xc = xc_broadcast(XC_HIGHPRI, mitigation_v2_change_cpu,
(void *)enabled, NULL); (void *)enabled, NULL);
xc_wait(xc); xc_wait(xc);
printf(" done!\n"); printf(" done!\n");