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From: Suleiman Souhlal <suleiman@google.com>
To: stable@vger.kernel.org
Cc: x86@kernel.org, kvm@vger.kernel.org, bp@alien8.de,
	pbonzini@redhat.com, peterz@infradead.org, jpoimboe@kernel.org,
	cascardo@canonical.com, surajjs@amazon.com, ssouhlal@FreeBSD.org,
	suleiman@google.com
Subject: [PATCH 4.19 22/34] x86/speculation: Fix SPEC_CTRL write on SMT state change
Date: Thu, 17 Nov 2022 18:19:40 +0900	[thread overview]
Message-ID: <20221117091952.1940850-23-suleiman@google.com> (raw)
In-Reply-To: <20221117091952.1940850-1-suleiman@google.com>

From: Josh Poimboeuf <jpoimboe@kernel.org>

commit 56aa4d221f1ee2c3a49b45b800778ec6e0ab73c5 upstream.

If the SMT state changes, SSBD might get accidentally disabled.  Fix
that.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Suleiman Souhlal <suleiman@google.com>
---
 arch/x86/kernel/cpu/bugs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 0734f35d1af1..e720dee4d30b 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1335,7 +1335,8 @@ static void __init spectre_v2_select_mitigation(void)
 
 static void update_stibp_msr(void * __unused)
 {
-	write_spec_ctrl_current(x86_spec_ctrl_base, true);
+	u64 val = spec_ctrl_current() | (x86_spec_ctrl_base & SPEC_CTRL_STIBP);
+	write_spec_ctrl_current(val, true);
 }
 
 /* Update x86_spec_ctrl_base in case SMT state changed. */
-- 
2.38.1.431.g37b22c650d-goog


  parent reply	other threads:[~2022-11-17  9:22 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-17  9:19 [PATCH 4.19 00/34] Intel RETBleed mitigations for 4.19 Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 01/34] Revert "x86/speculation: Add RSB VM Exit protections" Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 02/34] Revert "x86/cpu: Add a steppings field to struct x86_cpu_id" Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 03/34] x86/cpufeature: Add facility to check for min microcode revisions Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 04/34] x86/cpufeature: Fix various quality problems in the <asm/cpu_device_hd.h> header Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 05/34] x86/devicetable: Move x86 specific macro out of generic code Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 06/34] x86/cpu: Add consistent CPU match macros Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 07/34] x86/cpu: Add a steppings field to struct x86_cpu_id Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 08/34] x86/cpufeatures: Move RETPOLINE flags to word 11 Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 09/34] x86/bugs: Report AMD retbleed vulnerability Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 10/34] x86/bugs: Add AMD retbleed= boot parameter Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 11/34] x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 12/34] x86/entry: Remove skip_r11rcx Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 13/34] x86/entry: Add kernel IBRS implementation Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 14/34] x86/bugs: Optimize SPEC_CTRL MSR writes Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 15/34] x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 16/34] x86/bugs: Split spectre_v2_select_mitigation() and spectre_v2_user_select_mitigation() Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 17/34] x86/bugs: Report Intel retbleed vulnerability Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 18/34] intel_idle: Disable IBRS during long idle Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 19/34] x86/speculation: Change FILL_RETURN_BUFFER to work with objtool Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 20/34] x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 21/34] x86/speculation: Fix firmware entry SPEC_CTRL handling Suleiman Souhlal
2022-11-17  9:19 ` Suleiman Souhlal [this message]
2022-11-17  9:19 ` [PATCH 4.19 23/34] x86/speculation: Use cached host SPEC_CTRL value for guest entry/exit Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 24/34] x86/speculation: Remove x86_spec_ctrl_mask Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 25/34] KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 26/34] KVM: VMX: Fix IBRS handling after vmexit Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 27/34] x86/speculation: Fill RSB on vmexit for IBRS Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 28/34] x86/common: Stamp out the stepping madness Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 29/34] x86/cpu/amd: Enumerate BTC_NO Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 30/34] x86/bugs: Add Cannon lake to RETBleed affected CPU list Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 31/34] x86/speculation: Disable RRSBA behavior Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 32/34] x86/speculation: Use DECLARE_PER_CPU for x86_spec_ctrl_current Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 33/34] x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts Suleiman Souhlal
2022-11-17  9:19 ` [PATCH 4.19 34/34] x86/speculation: Add RSB VM Exit protections Suleiman Souhlal
2022-11-21 12:26 ` [PATCH 4.19 00/34] Intel RETBleed mitigations for 4.19 Greg KH
2022-11-21 12:43 [PATCH 4.19 00/34] 4.19.266-rc1 review Greg Kroah-Hartman
2022-11-21 12:43 ` [PATCH 4.19 22/34] x86/speculation: Fix SPEC_CTRL write on SMT state change Greg Kroah-Hartman

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