linux-kernel - Re: [PATCH v9 3/8] x86/vmware: Introduce VMware hypercall API

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Date: Wed, 22 May 2024 16:39:57 -0700
From: Alexey Makhalov <alexey.makhalov@...adcom.com>
To: Simon Horman <horms@...nel.org>
Cc: linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
 bp@...en8.de, 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, kirill.shutemov@...ux.intel.com,
 Nadav Amit <nadav.amit@...il.com>, Jeff Sipek <jsipek@...are.com>
Subject: Re: [PATCH v9 3/8] x86/vmware: Introduce VMware hypercall API

Hi Simon, apologize for long delay

On 5/11/24 8:02 AM, Simon Horman wrote:
>> diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
> 
> ...
> 
>> +static inline
>> +unsigned long vmware_hypercall3(unsigned long cmd, unsigned long in1,
>> +				uint32_t *out1, uint32_t *out2)
> 
> nit: u32 is preferred over uint32_t.
>       Likewise elsewhere in this patch-set.
Good to know. Can you please shed a light on the reason?
I still see bunch of stdint style uint32_t in arch/x86.


> ...
> 
>>   /*
>> - * The high bandwidth in call. The low word of edx is presumed to have the
>> - * HB bit set.
>> + * High bandwidth calls are not supported on encrypted memory guests.
>> + * The caller should check cc_platform_has(CC_ATTR_MEM_ENCRYPT) and use
>> + * low bandwidth hypercall it memory encryption is set.
>> + * This assumption simplifies HB hypercall impementation to just I/O port
> 
> nit: implementation
> 
>       checkpatch.pl --codespell is your friend
Thanks, that is useful!

> 
>> + * based approach without alternative patching.
>>    */
> 
> ...