linux-kernel - Re: [PATCH 1/6] x86: Add VMWare Host Communication Macros

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Date:	Tue, 1 Dec 2015 14:32:38 -0800
From:	Xavier Deguillard <xdeguillard@...are.com>
To:	Sinclair Yeh <syeh@...are.com>
Cc:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alok Kataria <akataria@...are.com>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/6] x86: Add VMWare Host Communication Macros

Hey Sinclair,

On Tue, Dec 01, 2015 at 02:18:47PM -0800, Sinclair Yeh wrote:
> +/**
> + * Hypervisor-specific bi-directional communication channel.  Should never
> + * execute on bare metal hardware.  The caller must make sure to check for
> + * supported hypervisor before using these macros.
> + *
> + * Several of the parameters are both input and output and must be initialized.
> + *
> + * @in1: [IN] Message Len or Message Cmd (HB)
> + * @in2: [IN] Message Len (HB) or Message Cmd

Can you make in1 always be the "Message Cmd" and in2 always be the
"Message len"?

> + * @port_num: [IN] port number + [channel id]
> + * @magic: [IN] hypervisor magic value
> + * @eax: [OUT] value of EAX register
> + * @ebx: [OUT] e.g. status from an HB message status command
> + * @ecx: [OUT] e.g. status from a non-HB message status command
> + * @edx: [OUT] e.g. channel id
> + * @si: [INOUT] set to 0 if not used
> + * @di: [INOUT] set to 0 if not used
> + * @bp: [INOUT] set to 0 if not used
> + */
> +#define VMW_PORT(in1, in2, port_num, magic, eax, ebx, ecx, edx, si, di) \
> +({                                                                      \
> +	__asm__ __volatile__ ("inl %%dx" :                              \

Are those '\' aligned in the code?

> +
> +#define VMW_PORT_HB_OUT(in1, in2, port_num, magic,      \
> +			eax, ebx, ecx, edx, si, di, bp) \
> +({                                                      \
> +	__asm__ __volatile__ ("movq %13, %%rbp;"        \

Same here.

> +
> +#define VMW_PORT_HB_IN(in1, in2, port_num, magic,            \
> +		       eax, ebx, ecx, edx, si, di, bp)       \
> +({                                                           \
> +	__asm__ __volatile__ ("push %%rbp; movq %13, %%rbp;" \

Same.

Xavier
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