linux-kernel - Re: [PATCH v8 1/7] x86/vmware: Move common macros to vmware.h

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 24 Apr 2024 18:06:08 +0200
From: Borislav Petkov <bp@...en8.de>
To: Alexey Makhalov <alexey.makhalov@...adcom.com>
Cc: linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
	hpa@...or.com, dave.hansen@...ux.intel.com, mingo@...hat.com,
	tglx@...utronix.de, x86@...nel.org, netdev@...r.kernel.org,
	richardcochran@...il.com, linux-input@...r.kernel.org,
	dmitry.torokhov@...il.com, zackr@...are.com,
	linux-graphics-maintainer@...are.com, pv-drivers@...are.com,
	timothym@...are.com, akaher@...are.com,
	dri-devel@...ts.freedesktop.org, daniel@...ll.ch, airlied@...il.com,
	tzimmermann@...e.de, mripard@...nel.org,
	maarten.lankhorst@...ux.intel.com, horms@...nel.org,
	kirill.shutemov@...ux.intel.com, Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH v8 1/7] x86/vmware: Move common macros to vmware.h

On Mon, Apr 22, 2024 at 03:56:50PM -0700, Alexey Makhalov wrote:
> Move VMware hypercall macros to vmware.h. This is a prerequisite for
> the introduction of vmware_hypercall API. No functional changes besides
> exporting vmware_hypercall_mode symbol.

Well, I see more.

So code movement patches should be done this way:

* first patch: sole code movement, no changes whatsoever

* follow-on patches: add changes and explain them

Because... (follow me down)...

> @@ -476,8 +431,8 @@ static bool __init vmware_legacy_x2apic_available(void)
>  {
>  	uint32_t eax, ebx, ecx, edx;
>  	VMWARE_CMD(GETVCPU_INFO, eax, ebx, ecx, edx);
> -	return !(eax & BIT(VMWARE_CMD_VCPU_RESERVED)) &&
> -		(eax & BIT(VMWARE_CMD_LEGACY_X2APIC));
> +	return !(eax & BIT(VCPU_RESERVED)) &&
> +		(eax & BIT(VCPU_LEGACY_X2APIC));

.. what is that change for?

Those bit definitions are clearly vmware-specific. So why are you
changing them to something generic-ish?

In any case, this patch needs to be split as outlined above.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette