linux-kernel - Re: [PATCH v3 12/16] x86_64,hyperv: Use direct call to hypercall-page

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Message-ID: <aHXf9TZIAS2u5AP8@liuwe-devbox-ubuntu-v2.lamzopl0uupeniq2etz1fddiyg.xx.internal.cloudapp.net>
Date: Tue, 15 Jul 2025 04:58:29 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
	wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
	hpa@...or.com, seanjc@...gle.com, pbonzini@...hat.com,
	ardb@...nel.org, kees@...nel.org, Arnd Bergmann <arnd@...db.de>,
	gregkh@...uxfoundation.org, jpoimboe@...nel.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, linux-efi@...r.kernel.org,
	samitolvanen@...gle.com, ojeda@...nel.org,
	Michael Kelley <mhklinux@...look.com>
Subject: Re: [PATCH v3 12/16] x86_64,hyperv: Use direct call to hypercall-page

On Mon, Jul 14, 2025 at 12:20:23PM +0200, Peter Zijlstra wrote:
> Instead of using an indirect call to the hypercall page, use a direct
> call instead. This avoids all CFI problems, including the one where
> the hypercall page doesn't have IBT on.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Reviewed-by: Michael Kelley <mhklinux@...look.com>

Acked-by: Wei Liu <wei.liu@...nel.org>