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Message-ID: <683225e0-1cd3-4dea-bb68-086d46b233e8@broadcom.com>
Date: Wed, 22 May 2024 16:39:57 -0700
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Subject: Re: [PATCH v9 3/8] x86/vmware: Introduce VMware hypercall API
To: Simon Horman <horms@kernel.org>
Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev,
 bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, mingo@redhat.com,
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 Nadav Amit <nadav.amit@gmail.com>, Jeff Sipek <jsipek@vmware.com>
References: <20240505182829.GBZjfPzeEijTsBUth5@fat_crate.local>
 <20240506215305.30756-1-alexey.makhalov@broadcom.com>
 <20240506215305.30756-4-alexey.makhalov@broadcom.com>
 <20240511150225.GK2347895@kernel.org>
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From: Alexey Makhalov <alexey.makhalov@broadcom.com>
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In-Reply-To: <20240511150225.GK2347895@kernel.org>
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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.
>>    */
> 
> ...