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mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DS0PR11MB7529.namprd11.prod.outlook.com (2603:10b6:8:141::20) by SA1PR11MB8595.namprd11.prod.outlook.com (2603:10b6:806:3a9::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8114.30; Tue, 5 Nov 2024 06:48:04 +0000 Received: from DS0PR11MB7529.namprd11.prod.outlook.com ([fe80::d244:15cd:1060:941a]) by DS0PR11MB7529.namprd11.prod.outlook.com ([fe80::d244:15cd:1060:941a%6]) with mapi id 15.20.8114.028; Tue, 5 Nov 2024 06:48:04 +0000 Message-ID: <8c6cf228-a024-41d7-ad9d-57a28ea91b29@intel.com> Date: Tue, 5 Nov 2024 14:52:41 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] intel_iommu: Send IQE event when setting reserved bit in IQT_TAIL To: Zhenzhong Duan , CC: , , , , Marcel Apfelbaum , Paolo Bonzini , "Richard Henderson" , Eduardo Habkost References: <20241104125536.1236118-1-zhenzhong.duan@intel.com> <20241104125536.1236118-2-zhenzhong.duan@intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: <20241104125536.1236118-2-zhenzhong.duan@intel.com> Content-Type: text/plain; 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envelope-from=yi.l.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.34, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 2024/11/4 20:55, Zhenzhong Duan wrote: > According to VTD spec, Figure 11-22, Invalidation Queue Tail Register, > "When Descriptor Width (DW) field in Invalidation Queue Address Register > (IQA_REG) is Set (256-bit descriptors), hardware treats bit-4 as reserved > and a value of 1 in the bit will result in invalidation queue error." > > Current code missed to send IQE event to guest, fix it. a nit: mention the spec revision as well since the Figure number may be modified. Reviewed-by: Yi Liu > > Fixes: c0c1d351849b ("intel_iommu: add 256 bits qi_desc support") > Suggested-by: Yi Liu > Signed-off-by: Zhenzhong Duan > --- > hw/i386/intel_iommu.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c > index 8612d0917b..1ecfe47963 100644 > --- a/hw/i386/intel_iommu.c > +++ b/hw/i386/intel_iommu.c > @@ -2847,6 +2847,7 @@ static void vtd_handle_iqt_write(IntelIOMMUState *s) > if (s->iq_dw && (val & VTD_IQT_QT_256_RSV_BIT)) { > error_report_once("%s: RSV bit is set: val=0x%"PRIx64, > __func__, val); > + vtd_handle_inv_queue_error(s); > return; > } > s->iq_tail = VTD_IQT_QT(s->iq_dw, val); -- Regards, Yi Liu