From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
tony.luck@intel.com, ak@linux.intel.com,
tim.c.chen@linux.intel.com,
Andrew Cooper <andrew.cooper3@citrix.com>,
Nikolay Borisov <nik.borisov@suse.com>
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
kvm@vger.kernel.org,
Alyssa Milburn <alyssa.milburn@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
antonio.gomez.iglesias@linux.intel.com
Subject: [PATCH v8 3/6] x86/entry_32: Add VERW just before userspace transition
Date: Tue, 13 Feb 2024 18:22:08 -0800 [thread overview]
Message-ID: <20240213-delay-verw-v8-3-a6216d83edb7@linux.intel.com> (raw)
In-Reply-To: <20240213-delay-verw-v8-0-a6216d83edb7@linux.intel.com>
As done for entry_64, add support for executing VERW late in exit to
user path for 32-bit mode.
Cc: stable@kernel.org
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
arch/x86/entry/entry_32.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 1b0fe4b49ea0..d3a814efbff6 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -881,6 +881,7 @@ SYM_FUNC_START(entry_SYSENTER_32)
BUG_IF_WRONG_CR3 no_user_check=1
popfl
popl %eax
+ CLEAR_CPU_BUFFERS
/*
* Return back to the vDSO, which will pop ecx and edx.
@@ -950,6 +951,7 @@ restore_all_switch_stack:
/* Restore user state */
RESTORE_REGS pop=4 # skip orig_eax/error_code
+ CLEAR_CPU_BUFFERS
.Lirq_return:
/*
* ARCH_HAS_MEMBARRIER_SYNC_CORE rely on IRET core serialization
@@ -1142,6 +1144,7 @@ SYM_CODE_START(asm_exc_nmi)
/* Not on SYSENTER stack. */
call exc_nmi
+ CLEAR_CPU_BUFFERS
jmp .Lnmi_return
.Lnmi_from_sysenter_stack:
--
2.34.1
next prev parent reply other threads:[~2024-02-14 2:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-14 2:21 [PATCH v8 0/6] Delay VERW Pawan Gupta
2024-02-14 2:21 ` [PATCH v8 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2024-02-14 2:21 ` [PATCH v8 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2024-02-14 2:22 ` Pawan Gupta [this message]
2024-02-14 2:22 ` [PATCH v8 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2024-02-14 2:22 ` [PATCH v8 5/6] KVM: VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2024-02-14 2:22 ` [PATCH v8 6/6] KVM: VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
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