linux-kernel - Re: [PATCH v9 25/27] KVM: nVMX: Introduce new VMX_BASIC bit for event error

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Date: Fri, 26 Jan 2024 15:54:00 +0800
From: Chao Gao <chao.gao@...el.com>
To: Yang Weijiang <weijiang.yang@...el.com>
CC: <seanjc@...gle.com>, <pbonzini@...hat.com>, <dave.hansen@...el.com>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
	<yuan.yao@...ux.intel.com>, <peterz@...radead.org>,
	<rick.p.edgecombe@...el.com>, <mlevitsk@...hat.com>, <john.allen@....com>
Subject: Re: [PATCH v9 25/27] KVM: nVMX: Introduce new VMX_BASIC bit for
 event error_code delivery to L1

On Tue, Jan 23, 2024 at 06:41:58PM -0800, Yang Weijiang wrote:
>Per SDM description(Vol.3D, Appendix A.1):
>"If bit 56 is read as 1, software can use VM entry to deliver a hardware
>exception with or without an error code, regardless of vector"
>
>Modify has_error_code check before inject events to nested guest. Only
>enforce the check when guest is in real mode, the exception is not hard
>exception and the platform doesn't enumerate bit56 in VMX_BASIC, in all
>other case ignore the check to make the logic consistent with SDM.
>
>Suggested-by: Chao Gao <chao.gao@...el.com>
>Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
>Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Reviewed-by: Chao Gao <chao.gao@...el.com>