From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Borislav Petkov <bp@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Ben Hutchings <ben@decadent.org.uk>
Subject: [PATCH 4.9 12/31] x86/tsx: Add "auto" option to the tsx= cmdline parameter
Date: Fri, 15 Nov 2019 14:20:41 +0800 [thread overview]
Message-ID: <20191115062014.685532405@linuxfoundation.org> (raw)
In-Reply-To: <20191115062009.813108457@linuxfoundation.org>
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
commit 7531a3596e3272d1f6841e0d601a614555dc6b65 upstream.
Platforms which are not affected by X86_BUG_TAA may want the TSX feature
enabled. Add "auto" option to the TSX cmdline parameter. When tsx=auto
disable TSX when X86_BUG_TAA is present, otherwise enable TSX.
More details on X86_BUG_TAA can be found here:
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
[ bp: Extend the arg buffer to accommodate "auto\0". ]
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
[bwh: Backported to 4.9: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Documentation/kernel-parameters.txt | 3 +++
arch/x86/kernel/cpu/tsx.c | 7 ++++++-
2 files changed, 9 insertions(+), 1 deletion(-)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -4537,6 +4537,9 @@ bytes respectively. Such letter suffixes
update. This new MSR allows for the reliable
deactivation of the TSX functionality.)
+ auto - Disable TSX if X86_BUG_TAA is present,
+ otherwise enable TSX on the system.
+
Not specifying this option is equivalent to tsx=off.
See Documentation/hw-vuln/tsx_async_abort.rst
--- a/arch/x86/kernel/cpu/tsx.c
+++ b/arch/x86/kernel/cpu/tsx.c
@@ -75,7 +75,7 @@ static bool __init tsx_ctrl_is_supported
void __init tsx_init(void)
{
- char arg[4] = {};
+ char arg[5] = {};
int ret;
if (!tsx_ctrl_is_supported())
@@ -87,6 +87,11 @@ void __init tsx_init(void)
tsx_ctrl_state = TSX_CTRL_ENABLE;
} else if (!strcmp(arg, "off")) {
tsx_ctrl_state = TSX_CTRL_DISABLE;
+ } else if (!strcmp(arg, "auto")) {
+ if (boot_cpu_has_bug(X86_BUG_TAA))
+ tsx_ctrl_state = TSX_CTRL_DISABLE;
+ else
+ tsx_ctrl_state = TSX_CTRL_ENABLE;
} else {
tsx_ctrl_state = TSX_CTRL_DISABLE;
pr_err("tsx: invalid option, defaulting to off\n");
next prev parent reply other threads:[~2019-11-15 6:23 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 6:20 [PATCH 4.9 00/31] 4.9.202-stable review Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 01/31] kvm: mmu: Dont read PDPTEs when paging is not enabled Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 02/31] Bluetooth: hci_ldisc: Postpone HCI_UART_PROTO_READY bit set in hci_uart_set_proto() Greg Kroah-Hartman
2019-11-15 16:10 ` Ralph Siemsen
2019-11-16 7:56 ` Greg Kroah-Hartman
2019-11-18 20:27 ` Ralph Siemsen
2019-11-19 4:47 ` Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 03/31] MIPS: BCM63XX: fix switch core reset on BCM6368 Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 04/31] usb: gadget: core: unmap request from DMA only if previously mapped Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 05/31] KVM: x86: use Intel speculation bugs and features as derived in generic x86 code Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 06/31] x86/msr: Add the IA32_TSX_CTRL MSR Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 07/31] x86/cpu: Add a helper function x86_read_arch_cap_msr() Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 08/31] x86/cpu: Add a "tsx=" cmdline option with TSX disabled by default Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 09/31] x86/speculation/taa: Add mitigation for TSX Async Abort Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 10/31] x86/speculation/taa: Add sysfs reporting " Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 11/31] kvm/x86: Export MDS_NO=0 to guests when TSX is enabled Greg Kroah-Hartman
2019-11-15 6:20 ` Greg Kroah-Hartman [this message]
2019-11-15 6:20 ` [PATCH 4.9 13/31] x86/speculation/taa: Add documentation for TSX Async Abort Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 14/31] x86/tsx: Add config options to set tsx=on|off|auto Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 15/31] x86/speculation/taa: Fix printing of TAA_MSG_SMT on IBRS_ALL CPUs Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 16/31] KVM: x86: simplify ept_misconfig Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 17/31] KVM: x86: extend usage of RET_MMIO_PF_* constants Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 18/31] kvm: Convert kvm_lock to a mutex Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 19/31] kvm: x86: Do not release the page inside mmu_set_spte() Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 20/31] KVM: x86: make FNAME(fetch) and __direct_map more similar Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 21/31] KVM: x86: remove now unneeded hugepage gfn adjustment Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 22/31] KVM: x86: change kvm_mmu_page_get_gfn BUG_ON to WARN_ON Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 23/31] KVM: x86: Add is_executable_pte() Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 24/31] KVM: x86: add tracepoints around __direct_map and FNAME(fetch) Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 25/31] KVM: vmx, svm: always run with EFER.NXE=1 when shadow paging is active Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 26/31] x86/bugs: Add ITLB_MULTIHIT bug infrastructure Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 27/31] cpu/speculation: Uninline and export CPU mitigations helpers Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 28/31] kvm: mmu: ITLB_MULTIHIT mitigation Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 29/31] kvm: Add helper function for creating VM worker threads Greg Kroah-Hartman
2019-11-15 6:20 ` [PATCH 4.9 30/31] kvm: x86: mmu: Recovery of shattered NX large pages Greg Kroah-Hartman
2019-11-15 6:21 ` [PATCH 4.9 31/31] Documentation: Add ITLB_MULTIHIT documentation Greg Kroah-Hartman
2019-11-15 12:00 ` [PATCH 4.9 00/31] 4.9.202-stable review kernelci.org bot
2019-11-15 13:50 ` Jon Hunter
2019-11-15 15:07 ` Greg Kroah-Hartman
2019-11-15 13:56 ` Guenter Roeck
2019-11-15 15:08 ` Greg Kroah-Hartman
2019-11-15 15:52 ` Naresh Kamboju
2019-11-16 8:02 ` Greg Kroah-Hartman
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