linux-kernel - [PATCH 4.9 37/92] KVM: VMX: Make indirect call speculation safe

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Date:   Fri,  9 Feb 2018 14:39:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, rga@...zon.de,
        Dave Hansen <dave.hansen@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: [PATCH 4.9 37/92] KVM: VMX: Make indirect call speculation safe

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <peterz@...radead.org>

(cherry picked from commit c940a3fb1e2e9b7d03228ab28f375fb5a47ff699)

Replace indirect call with CALL_NOSPEC.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: David Woodhouse <dwmw@...zon.co.uk>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Jun Nakajima <jun.nakajima@...el.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: rga@...zon.de
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Asit Mallick <asit.k.mallick@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Jason Baron <jbaron@...mai.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@...el.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Link: https://lkml.kernel.org/r/20180125095843.645776917@infradead.org
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/vmx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8676,14 +8676,14 @@ static void vmx_handle_external_intr(str
 #endif
 			"pushf\n\t"
 			__ASM_SIZE(push) " $%c[cs]\n\t"
-			"call *%[entry]\n\t"
+			CALL_NOSPEC
 			:
 #ifdef CONFIG_X86_64
 			[sp]"=&r"(tmp),
 #endif
 			"+r"(__sp)
 			:
-			[entry]"r"(entry),
+			THUNK_TARGET(entry),
 			[ss]"i"(__KERNEL_DS),
 			[cs]"i"(__KERNEL_CS)
 			);