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
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,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Subject: [PATCH v2 3/6] x86/entry_32: Add VERW just before userspace transition
Date: Tue, 24 Oct 2023 01:08:33 -0700 [thread overview]
Message-ID: <20231024-delay-verw-v2-3-f1881340c807@linux.intel.com> (raw)
In-Reply-To: <20231024-delay-verw-v2-0-f1881340c807@linux.intel.com>
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 6e6af42e044a..74a4358c7f45 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:
--
2.34.1
next prev parent reply other threads:[~2023-10-24 8:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-24 8:08 [PATCH v2 0/6] Delay VERW Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2023-10-24 10:36 ` Peter Zijlstra
2023-10-24 16:35 ` Pawan Gupta
2023-10-24 16:36 ` Peter Zijlstra
2023-10-24 16:45 ` Pawan Gupta
2023-10-24 17:02 ` Peter Zijlstra
2023-10-24 17:30 ` Pawan Gupta
2023-10-24 18:27 ` H. Peter Anvin
2023-10-24 18:49 ` Luck, Tony
2023-10-24 19:14 ` H. Peter Anvin
2023-10-24 19:40 ` Luck, Tony
2023-10-24 20:30 ` H. Peter Anvin
2023-10-24 22:30 ` Peter Zijlstra
2023-10-24 22:28 ` Peter Zijlstra
2023-10-25 4:00 ` Pawan Gupta
2023-10-25 6:56 ` Peter Zijlstra
2023-10-25 15:06 ` Pawan Gupta
2023-10-25 6:58 ` Peter Zijlstra
2023-10-25 15:10 ` Pawan Gupta
2023-10-24 8:08 ` [PATCH v2 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2023-10-24 8:08 ` Pawan Gupta [this message]
2023-10-24 8:08 ` [PATCH v2 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2023-10-25 22:08 ` kernel test robot
2023-10-24 8:08 ` [PATCH v2 5/6] KVM: VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2023-10-25 8:15 ` Nikolay Borisov
2023-10-24 8:08 ` [PATCH v2 6/6] KVM: VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
2023-10-25 7:47 ` Chao Gao
2023-10-25 15:15 ` Pawan Gupta
2023-10-24 12:26 ` [PATCH v2 0/6] Delay VERW Matthew Wilcox
2023-10-24 17:01 ` Pawan Gupta
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