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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 SJ0PR11MB4798.namprd11.prod.outlook.com (2603:10b6:a03:2d5::12) by PH0PR11MB7168.namprd11.prod.outlook.com (2603:10b6:510:1e9::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9228.11; Thu, 16 Oct 2025 12:11:19 +0000 Received: from SJ0PR11MB4798.namprd11.prod.outlook.com ([fe80::d946:6abf:6e7e:fd1e]) by SJ0PR11MB4798.namprd11.prod.outlook.com ([fe80::d946:6abf:6e7e:fd1e%7]) with mapi id 15.20.9228.012; Thu, 16 Oct 2025 12:11:19 +0000 Message-ID: <4205373d-b583-4d6b-8004-d86e51082375@intel.com> Date: Thu, 16 Oct 2025 20:18:05 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] intel_iommu: Reset pasid cache when system level reset To: Zhenzhong Duan , CC: , , , References: <20251016074544.377637-1-zhenzhong.duan@intel.com> <20251016074544.377637-3-zhenzhong.duan@intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: <20251016074544.377637-3-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: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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, 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 2025/10/16 15:45, Zhenzhong Duan wrote: > Reset pasid cache when system level reset. Currently we don't have any > device supporting PASID yet. So all are PASID_0, its vtd_as is allocated > by PCI system and never removed, just mark pasid cache invalid. > > Signed-off-by: Yi Liu > Signed-off-by: Zhenzhong Duan > --- > hw/i386/intel_iommu.c | 16 ++++++++++++++++ > hw/i386/trace-events | 1 + > 2 files changed, 17 insertions(+) > > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c > index c47f13b659..07bc0a749c 100644 > --- a/hw/i386/intel_iommu.c > +++ b/hw/i386/intel_iommu.c > @@ -87,6 +87,21 @@ struct vtd_iotlb_key { > static void vtd_address_space_refresh_all(IntelIOMMUState *s); > static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n); > > +static void vtd_pasid_cache_reset_locked(IntelIOMMUState *s) > +{ > + VTDAddressSpace *vtd_as; > + GHashTableIter as_it; > + > + trace_vtd_pasid_cache_reset(); > + > + g_hash_table_iter_init(&as_it, s->vtd_address_spaces); > + while (g_hash_table_iter_next(&as_it, NULL, (void **)&vtd_as)) { > + VTDPASIDCacheEntry *pc_entry = &vtd_as->pasid_cache_entry; > + pc_entry->valid = false; > + } do you have any special reason to use this version? To me, the prior version looks better. I think global reset also need to be followed by switch as and as sync. right? The prior version supports it once patch 03 is applied. > +} > + > + > static void vtd_define_quad(IntelIOMMUState *s, hwaddr addr, uint64_t val, > uint64_t wmask, uint64_t w1cmask) > { > @@ -381,6 +396,7 @@ static void vtd_reset_caches(IntelIOMMUState *s) > vtd_iommu_lock(s); > vtd_reset_iotlb_locked(s); > vtd_reset_context_cache_locked(s); > + vtd_pasid_cache_reset_locked(s); > vtd_iommu_unlock(s); > } > > diff --git a/hw/i386/trace-events b/hw/i386/trace-events > index 298addb24d..b704f4f90c 100644 > --- a/hw/i386/trace-events > +++ b/hw/i386/trace-events > @@ -24,6 +24,7 @@ vtd_inv_qi_head(uint16_t head) "read head %d" > vtd_inv_qi_tail(uint16_t head) "write tail %d" > vtd_inv_qi_fetch(void) "" > vtd_context_cache_reset(void) "" > +vtd_pasid_cache_reset(void) "" > vtd_inv_desc_pasid_cache_gsi(void) "" > vtd_inv_desc_pasid_cache_dsi(uint16_t domain) "Domain selective PC invalidation domain 0x%"PRIx16 > vtd_inv_desc_pasid_cache_psi(uint16_t domain, uint32_t pasid) "PASID selective PC invalidation domain 0x%"PRIx16" pasid 0x%"PRIx32