Date: Mon, 6 Aug 2018 03:58:56 +0000 (UTC) From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r337370 - in stable/11: stand/man sys/dev/efidev Message-ID: <201808060358.w763wu7I080333@repo.freebsd.org>
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Author: kevans Date: Mon Aug 6 03:58:56 2018 New Revision: 337370 URL: https://svnweb.freebsd.org/changeset/base/337370 Log: MFC r336919, r336924 r336919: efirt: Add tunable to allow disabling EFI Runtime Services Leading up to enabling EFIRT in GENERIC, allow runtime services to be disabled with a new tunable: efi.rt_disabled. This makes it so that EFIRT can be disabled easily in case we run into some buggy UEFI implementation and fail to boot. r336924: Follow up to r336919 and r336921: s/efi.rt_disabled/efi.rt.disabled/ The latter matches the rest of the tree better [0]. The UPDATING entry has been updated to reflect this, and the new tunable is now documented in loader(8) [1]. Reported by: imp [0], Shawn Webb [1] Modified: stable/11/stand/man/loader.8 stable/11/sys/dev/efidev/efirt.c Directory Properties: stable/11/ (props changed) Modified: stable/11/stand/man/loader.8 ============================================================================== --- stable/11/stand/man/loader.8 Mon Aug 6 03:41:52 2018 (r337369) +++ stable/11/stand/man/loader.8 Mon Aug 6 03:58:56 2018 (r337370) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 18, 2015 +.Dd July 30, 2018 .Dt LOADER 8 .Os .Sh NAME @@ -588,6 +588,10 @@ explicitly. Other variables are used to override kernel tunable parameters. The following tunables are available: .Bl -tag -width Va +.It Va efi.rt.disabled +Disable UEFI runtime services in the kernel, if applicable. +Runtime services are only available and used if the kernel is booted in a UEFI +environment. .It Va hw.physmem Limit the amount of physical memory the system will use. By default the size is in bytes, but the Modified: stable/11/sys/dev/efidev/efirt.c ============================================================================== --- stable/11/sys/dev/efidev/efirt.c Mon Aug 6 03:41:52 2018 (r337369) +++ stable/11/sys/dev/efidev/efirt.c Mon Aug 6 03:58:56 2018 (r337370) @@ -133,7 +133,12 @@ efi_init(void) struct efi_md *map; caddr_t kmdp; size_t efisz; + int rt_disabled; + rt_disabled = 0; + TUNABLE_INT_FETCH("efi.rt.disabled", &rt_disabled); + if (rt_disabled == 1) + return (0); mtx_init(&efi_lock, "efi", NULL, MTX_DEF); if (efi_systbl_phys == 0) { @@ -217,6 +222,9 @@ static void efi_uninit(void) { + /* Most likely disabled by tunable */ + if (efi_runtime == NULL) + return; efi_destroy_1t1_map(); efi_systbl = NULL;
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