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From: Joerg Roedel <joro@8bytes.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-coco@lists.linux.dev, Joerg Roedel <jroedel@suse.de>
Subject: Re: [PATCH v2 1/4] KVM: SVM: Get rid of *ghcb_msr_bits() functions
Date: Thu, 9 Sep 2021 15:32:21 +0200	[thread overview]
Message-ID: <YToM5akzNrlqHTJz@8bytes.org> (raw)
In-Reply-To: <YS/sqmgbS6ACRfSD@google.com>

On Wed, Sep 01, 2021 at 09:12:10PM +0000, Sean Christopherson wrote:
> On Thu, Jul 22, 2021, Joerg Roedel wrote:
> >  	case GHCB_MSR_TERM_REQ: {
> >  		u64 reason_set, reason_code;
> >  
> > -		reason_set = get_ghcb_msr_bits(svm,
> > -					       GHCB_MSR_TERM_REASON_SET_MASK,
> > -					       GHCB_MSR_TERM_REASON_SET_POS);
> > -		reason_code = get_ghcb_msr_bits(svm,
> > -						GHCB_MSR_TERM_REASON_MASK,
> > -						GHCB_MSR_TERM_REASON_POS);
> > +		reason_set  = GHCB_MSR_TERM_REASON_SET(control->ghcb_gpa);
> > +		reason_code = GHCB_MSR_TERM_REASON(control->ghcb_gpa);
> > +
> >  		pr_info("SEV-ES guest requested termination: %#llx:%#llx\n",
> >  			reason_set, reason_code);
> > +
> >  		fallthrough;
> 
> Not related to this patch, but why use fallthrough and more importantly, why is
> this an -EINVAL return?  Why wouldn't KVM forward the request to userspace instead
> of returning an opaque -EINVAL?

I guess it is to signal an error condition up the call-chain to get the
guest terminated, like requested.

Regards,

	Joerg

  parent reply	other threads:[~2021-09-09 13:32 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 11:52 [PATCH v2 0/4] KVM: SVM: Add initial GHCB protocol version 2 support Joerg Roedel
2021-07-22 11:52 ` [PATCH v2 1/4] KVM: SVM: Get rid of *ghcb_msr_bits() functions Joerg Roedel
2021-09-01 21:12   ` Sean Christopherson
2021-09-01 21:31     ` Sean Christopherson
2021-09-09 13:22       ` Joerg Roedel
2021-09-09 13:32     ` Joerg Roedel [this message]
2021-09-20 16:10       ` Sean Christopherson
2021-07-22 11:52 ` [PATCH v2 2/4] KVM: SVM: Add support to handle AP reset MSR protocol Joerg Roedel
2021-09-01 21:45   ` Sean Christopherson
2021-07-22 11:52 ` [PATCH v2 3/4] KVM: SVM: Add support for Hypervisor Feature support " Joerg Roedel
2021-07-22 12:01   ` [PATCH v2.1 " Joerg Roedel
2021-09-01 22:41     ` Sean Christopherson
2021-07-22 11:52 ` [PATCH v2 4/4] KVM: SVM: Increase supported GHCB protocol version Joerg Roedel

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