| Message ID | 20240111-delay-verw-v5-3-a3b234933ea6@linux.intel.com |
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Date: Thu, 11 Jan 2024 00:56:36 -0800
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,
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Alyssa Milburn <alyssa.milburn@linux.intel.com>,
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Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Subject: [PATCH v5 3/6] x86/entry_32: Add VERW just before userspace
transition
Message-ID: <20240111-delay-verw-v5-3-a3b234933ea6@linux.intel.com>
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|
| Series |
Delay VERW
|
|
Commit Message
Pawan Gupta
Jan. 11, 2024, 8:56 a.m. UTC
As done for entry_64, add support for executing VERW late in exit to
user path for 32-bit mode.
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 c73047bf9f4b..fba427646805 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -885,6 +885,7 @@ 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. @@ -954,6 +955,7 @@ 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 @@ -1146,6 +1148,7 @@ SYM_CODE_START(asm_exc_nmi) /* Not on SYSENTER stack. */ call exc_nmi + CLEAR_CPU_BUFFERS jmp .Lnmi_return .Lnmi_from_sysenter_stack: