RE: [PATCH 2/4] x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI

Michael Kelley (EOSG)
2018-06-25T23:54:32Z

> -----Original Message-----
> From: Vitaly Kuznetsov <vkuznets@redhat.com>
> Sent: Friday, June 22, 2018 10:06 AM
> To: x86@kernel.org
> Cc: devel@linuxdriverproject.org; linux-kernel@vger.kernel.org; KY Srinivasan
> <kys@microsoft.com>; Haiyang Zhang <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; Thomas Gleixner <tglx@linutronix.de>; Ingo Molnar
> <mingo@redhat.com>; H. Peter Anvin <hpa@zytor.com>; Tianyu Lan
> <Tianyu.Lan@microsoft.com>; Michael Kelley (EOSG) <Michael.H.Kelley@microsoft.com>
> Subject: [PATCH 2/4] x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI
>
> Current Hyper-V TLFS (v5.0b) claims that HvCallSendSyntheticClusterIpi
> hypercall can't be 'fast' (passing parameters through registers) but
> apparently this is not true, Windows always uses 'fast' version. We can
> do the same in Linux too.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Reviewed-by: Michael Kelley <mikelley@microsoft.com>