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From: Yian Chen <yian.chen@intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ravi Shankar <ravi.v.shankar@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Sohil Mehta <sohil.mehta@intel.com>,
	Paul Lai <paul.c.lai@intel.com>, Yian Chen <yian.chen@intel.com>
Subject: [PATCH 6/7] x86/cpu: Set LASS as pinning sensitive CR4 bit
Date: Mon,  9 Jan 2023 21:52:03 -0800	[thread overview]
Message-ID: <20230110055204.3227669-7-yian.chen@intel.com> (raw)
In-Reply-To: <20230110055204.3227669-1-yian.chen@intel.com>

Security protection features are pinning sensitive.
LASS comes with an effort for security concerns.
Therefore, add it to the set of pinning sensitive
bits

Signed-off-by: Yian Chen <yian.chen@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
 arch/x86/kernel/cpu/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index efc7c7623968..e224cbaf7866 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -432,7 +432,7 @@ static __always_inline void setup_lass(struct cpuinfo_x86 *c)
 /* These bits should not change their value after CPU init is finished. */
 static const unsigned long cr4_pinned_mask =
 	X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_UMIP |
-	X86_CR4_FSGSBASE | X86_CR4_CET;
+	X86_CR4_FSGSBASE | X86_CR4_CET | X86_CR4_LASS;
 static DEFINE_STATIC_KEY_FALSE_RO(cr_pinning);
 static unsigned long cr4_pinned_bits __ro_after_init;
 
-- 
2.34.1


  parent reply	other threads:[~2023-01-10  5:58 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-10  5:51 [PATCH 0/7] Enable LASS (Linear Address space Separation) Yian Chen
2023-01-10  5:51 ` [PATCH 1/7] x86/cpu: Enumerate LASS CPUID and CR4 bits Yian Chen
2023-01-10 20:14   ` Sohil Mehta
2023-01-11  0:13     ` Dave Hansen
2023-01-11 23:23       ` Chen, Yian
2023-01-12  0:06         ` Luck, Tony
2023-01-12  0:15           ` Chen, Yian
2023-01-11 19:21     ` Chen, Yian
2023-01-10  5:51 ` [PATCH 2/7] x86: Add CONFIG option X86_LASS Yian Chen
2023-01-10 21:05   ` Sohil Mehta
2023-01-12  0:13     ` Chen, Yian
2023-01-10  5:52 ` [PATCH 3/7] x86/cpu: Disable kernel LASS when patching kernel alternatives Yian Chen
2023-01-10 21:04   ` Peter Zijlstra
2023-01-11  1:01     ` Chen, Yian
2023-01-11  9:10       ` Peter Zijlstra
2023-01-10 22:41   ` Sohil Mehta
2023-01-12  0:27     ` Chen, Yian
2023-01-12  0:37       ` Dave Hansen
2023-01-12 18:36         ` Chen, Yian
2023-01-12 18:48           ` Dave Hansen
2023-02-01  2:25             ` Sohil Mehta
2023-02-01 18:20               ` Dave Hansen
2023-02-01  2:10         ` Sohil Mehta
2023-01-10  5:52 ` [PATCH 4/7] x86/vsyscall: Setup vsyscall to compromise LASS protection Yian Chen
2023-01-11  0:34   ` Sohil Mehta
2023-01-12  1:43     ` Chen, Yian
2023-01-12  2:49       ` Sohil Mehta
2023-01-21  4:09   ` Andy Lutomirski
2023-01-10  5:52 ` [PATCH 5/7] x86/cpu: Enable LASS (Linear Address Space Separation) Yian Chen
2023-01-11 22:22   ` Sohil Mehta
2023-01-12 17:56     ` Chen, Yian
2023-01-12 18:17   ` Dave Hansen
2023-01-13  1:17     ` Sohil Mehta
2023-01-13 19:39       ` Sohil Mehta
2023-01-10  5:52 ` Yian Chen [this message]
2023-01-10  5:52 ` [PATCH 7/7] x86/kvm: Expose LASS feature to VM guest Yian Chen
2023-02-07  3:21   ` Wang, Lei
2023-02-09 17:18     ` Sean Christopherson
2023-01-10 19:48 ` [PATCH 0/7] Enable LASS (Linear Address space Separation) Sohil Mehta
2023-01-10 22:57 ` Dave Hansen

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