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From: Paolo Bonzini <pbonzini@redhat.com>
To: Wei Liu <wei.liu@kernel.org>,
	Siddharth Chandrasekaran <sidcha@amazon.de>
Cc: kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, x86@kernel.org, hpa@zytor.com, seanjc@google.com,
	vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com,
	joro@8bytes.org, graf@amazon.com, eyakovl@amazon.de,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Subject: Re: [PATCH 0/4] Add support for XMM fast hypercalls
Date: Thu, 8 Apr 2021 17:30:26 +0200	[thread overview]
Message-ID: <033e7d77-d640-2c12-4918-da6b5b7f4e21@redhat.com> (raw)
In-Reply-To: <20210408152817.k4d4hjdqu7hsjllo@liuwe-devbox-debian-v2>

On 08/04/21 17:28, Wei Liu wrote:
>> Although the Hyper-v TLFS mentions that a guest cannot use this feature
>> unless the hypervisor advertises support for it, some hypercalls which
>> we plan on upstreaming in future uses them anyway.
>
> No, please don't do this. Check the feature bit(s) before you issue
> hypercalls which rely on the extended interface.

Perhaps Siddharth should clarify this, but I read it as Hyper-V being 
buggy and using XMM arguments unconditionally.

Paolo


  reply	other threads:[~2021-04-08 15:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 21:29 [PATCH 0/4] Add support for XMM fast hypercalls Siddharth Chandrasekaran
2021-04-08 15:28 ` Wei Liu
2021-04-08 15:30   ` Paolo Bonzini [this message]
2021-04-08 15:38     ` Wei Liu
2021-04-08 16:21       ` Siddharth Chandrasekaran
2021-04-08 15:40     ` Siddharth Chandrasekaran
2021-04-08 15:48       ` Paolo Bonzini
2021-04-08 15:54         ` Siddharth Chandrasekaran
2021-04-08 16:30           ` Wei Liu
2021-04-08 17:45             ` Siddharth Chandrasekaran
2021-04-09  7:42               ` Vitaly Kuznetsov
2021-04-09  7:59                 ` Siddharth Chandrasekaran

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