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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1714154146916100002 QEMU needs to know whether clearing maskbit of a vector is really clearing, or was already cleared before. Currently Xen sends only clearing that bit to the device model, but not setting it, so QEMU cannot detect it. Because of that, QEMU is working this around by checking via /dev/mem, but that isn't the proper approach. Give all necessary information to QEMU by passing all ctrl writes, including masking a vector. Advertise the new behavior via XENVER_get_features, so QEMU can know it doesn't need to access /dev/mem anymore. While this commit doesn't move the whole maskbit handling to QEMU (as discussed on xen-devel as one of the possibilities), it is a necessary first step anyway. Including telling QEMU it will get all the required information to do so. The actual implementation would need to include: - a hypercall for QEMU to control just maskbit (without (re)binding the interrupt again - a methor for QEMU to tell Xen it will actually do the work Those are not part of this series. Signed-off-by: Marek Marczykowski-G=C3=B3recki Reviewed-by: Jan Beulich --- I did not added any control to enable/disable this new behavior (as Roger have suggested for possible non-QEMU ioreqs). I don't see how the new behavior could be problematic for some existing ioreq server (they already received writes to those addresses, just not all of them), but if that's really necessary, I can probably add a command line option to restore previous behavior system-wide. Changes in v5: - announce the feature only on x86 - style fixes Changes in v4: - ignore unaligned writes with X86EMUL_OKAY - restructure the code to forward all writes in _msixtbl_write() instead of manipulating return value of msixtbl_write() - this makes WRITE_LEN4_COMPLETION special case unnecessary - advertise the changed behavior via XENVER_get_features instead of DMOP v3: - advertise changed behavior in XEN_DMOP_get_ioreq_server_info - make "flags" parameter IN/OUT - move len check back to msixtbl_write() - will be needed there anyway in a later patch v2: - passthrough quad writes to emulator too (Jan) - (ab)use len=3D=3D0 for write len=3D4 completion (Jan), but add descripti= ve #define for this magic value --- xen/arch/x86/hvm/vmsi.c | 19 ++++++++++++++----- xen/common/kernel.c | 1 + xen/include/public/features.h | 8 ++++++++ 3 files changed, 23 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c index adbac965f9f7..999917983789 100644 --- a/xen/arch/x86/hvm/vmsi.c +++ b/xen/arch/x86/hvm/vmsi.c @@ -283,8 +283,8 @@ static int msixtbl_write(struct vcpu *v, unsigned long = address, unsigned long flags; struct irq_desc *desc; =20 - if ( (len !=3D 4 && len !=3D 8) || (address & (len - 1)) ) - return r; + if ( !IS_ALIGNED(address, len) ) + return X86EMUL_OKAY; =20 rcu_read_lock(&msixtbl_rcu_lock); =20 @@ -345,8 +345,7 @@ static int msixtbl_write(struct vcpu *v, unsigned long = address, =20 unlock: spin_unlock_irqrestore(&desc->lock, flags); - if ( len =3D=3D 4 ) - r =3D X86EMUL_OKAY; + r =3D X86EMUL_OKAY; =20 out: rcu_read_unlock(&msixtbl_rcu_lock); @@ -357,7 +356,17 @@ static int cf_check _msixtbl_write( const struct hvm_io_handler *handler, uint64_t address, uint32_t len, uint64_t val) { - return msixtbl_write(current, address, len, val); + /* Ignore invalid length or unaligned writes. */ + if ( (len !=3D 4 && len !=3D 8) || !IS_ALIGNED(address, len) ) + return X86EMUL_OKAY; + + /* + * This function returns X86EMUL_UNHANDLEABLE even if write is properly + * handled, to propagate it to the device model (so it can keep its + * internal state in sync). + */ + msixtbl_write(current, address, len, val); + return X86EMUL_UNHANDLEABLE; } =20 static bool cf_check msixtbl_range( diff --git a/xen/common/kernel.c b/xen/common/kernel.c index 08dbaa2a054c..b44b2439ca8e 100644 --- a/xen/common/kernel.c +++ b/xen/common/kernel.c @@ -637,6 +637,7 @@ long do_xen_version(int cmd, XEN_GUEST_HANDLE_PARAM(voi= d) arg) fi.submap |=3D (1U << XENFEAT_hvm_safe_pvclock) | (1U << XENFEAT_hvm_callback_vector) | (has_pirq(d) ? (1U << XENFEAT_hvm_pirqs) : 0); + fi.submap |=3D (1U << XENFEAT_dm_msix_all_writes); #endif if ( !paging_mode_translate(d) || is_domain_direct_mapped(d) ) fi.submap |=3D (1U << XENFEAT_direct_mapped); diff --git a/xen/include/public/features.h b/xen/include/public/features.h index 4437f25d2532..880193094713 100644 --- a/xen/include/public/features.h +++ b/xen/include/public/features.h @@ -120,6 +120,14 @@ #define XENFEAT_runstate_phys_area 18 #define XENFEAT_vcpu_time_phys_area 19 =20 +/* + * If set, Xen will passthrough all MSI-X vector ctrl writes to device mod= el, + * not only those unmasking an entry. This allows device model to properly= keep + * track of the MSI-X table without having to read it from the device behi= nd + * Xen's backs. This information is relevant only for device models. + */ +#define XENFEAT_dm_msix_all_writes 20 + #define XENFEAT_NR_SUBMAPS 1 =20 #endif /* __XEN_PUBLIC_FEATURES_H__ */ --=20 git-series 0.9.1 From nobody Sun May 19 21:02:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1714154150111802.5671929907103; Fri, 26 Apr 2024 10:55:50 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.712995.1113935 (Exim 4.92) (envelope-from ) id 1s0Pn4-00050Q-9S; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1714154150900100009 The arch_msix struct had a single "warned" field with a domid for which warning was issued. Upcoming patch will need similar mechanism for few more warnings, so change it to save a bit field of issued warnings. Signed-off-by: Marek Marczykowski-G=C3=B3recki Reviewed-by: Jan Beulich --- Changes in v6: - add MSIX_CHECK_WARN macro (Jan) - drop struct name from warned_kind union (Jan) New in v5 --- xen/arch/x86/include/asm/msi.h | 17 ++++++++++++++++- xen/arch/x86/msi.c | 5 +---- 2 files changed, 17 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/include/asm/msi.h b/xen/arch/x86/include/asm/msi.h index 997ccb87be0c..bcfdfd35345d 100644 --- a/xen/arch/x86/include/asm/msi.h +++ b/xen/arch/x86/include/asm/msi.h @@ -208,6 +208,15 @@ struct msg_address { PCI_MSIX_ENTRY_SIZE + \ (~PCI_MSIX_BIRMASK & (PAGE_SIZE - 1= ))) =20 +#define MSIX_CHECK_WARN(msix, domid, which) ({ \ + if ( (msix)->warned_domid !=3D (domid) ) \ + { \ + (msix)->warned_domid =3D (domid); \ + (msix)->warned_kind.all =3D 0; \ + } \ + (msix)->warned_kind.which ? false : ((msix)->warned_kind.which =3D tru= e); \ +}) + struct arch_msix { unsigned int nr_entries, used_entries; struct { @@ -217,7 +226,13 @@ struct arch_msix { int table_idx[MAX_MSIX_TABLE_PAGES]; spinlock_t table_lock; bool host_maskall, guest_maskall; - domid_t warned; + domid_t warned_domid; + union { + uint8_t all; + struct { + bool maskall : 1; + }; + } warned_kind; }; =20 void early_msi_init(void); diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c index e721aaf5c001..42c793426da3 100644 --- a/xen/arch/x86/msi.c +++ b/xen/arch/x86/msi.c @@ -364,13 +364,10 @@ static bool msi_set_mask_bit(struct irq_desc *desc, b= ool host, bool guest) domid_t domid =3D pdev->domain->domain_id; =20 maskall =3D true; - if ( pdev->msix->warned !=3D domid ) - { - pdev->msix->warned =3D domid; + if ( MSIX_CHECK_WARN(pdev->msix, domid, maskall) ) printk(XENLOG_G_WARNING "cannot mask IRQ %d: masking MSI-X on Dom%d's %pp\n= ", desc->irq, domid, &pdev->sbdf); - } } pdev->msix->host_maskall =3D maskall; if ( maskall || pdev->msix->guest_maskall ) --=20 git-series 0.9.1 From nobody Sun May 19 21:02:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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s=fm3; t=1714154116; x= 1714240516; bh=4hT2or0Itip5jFfCLVRRh827QMnfJPeWI2OQoU3RIPw=; b=h UVQvVwAj947lUYO6bA2M41Mu+v63wA3C0+7+CD4FOsDLm1Ck8P3oKOulag8sBHvK 9qf/rAecyyDIklsr6lfex8bVS67s9VgYJPUI91AoqBw5zBGBKB41Iqg64urKZZDz vx9DxSb/YZdIeFNipG+6dapr1jIsTFErnrajdluvKo7OZcIcexy/WMbwPzlvFLms Cec/bqwMD98oQQF25NuyxlIwd/mo3sHFuzv2RGnyuzWYBHwMciUxgy6A1s6yh8nc SbKDNK/ySoC8jdbnzpp0rFZOM0spYf3FAITO2wcmMbQrLHuZ6bWNtnxx7Xg6O8Kj um+qrP2j0/59L6xTKEg8g== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvledrudelledguddukecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd enucfjughrpefhvfevufffkffojghfgggtgfesthekredtredtjeenucfhrhhomhepofgr rhgvkhcuofgrrhgtiiihkhhofihskhhiqdfikphrvggtkhhiuceomhgrrhhmrghrvghkse hinhhvihhsihgslhgvthhhihhnghhslhgrsgdrtghomheqnecuggftrfgrthhtvghrnhep hfeihffghefgkeetiefgtdeivdfgvefhhfefvdduleetvdfggedtkeetfeefgeehnecuff homhgrihhnpehmshhigihtsghlpghlihhsthdrnhgvgihtnecuvehluhhsthgvrhfuihii vgeptdenucfrrghrrghmpehmrghilhhfrhhomhepmhgrrhhmrghrvghksehinhhvihhsih gslhgvthhhihhnghhslhgrsgdrtghomh X-ME-Proxy: Feedback-ID: i1568416f:Fastmail From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= To: xen-devel@lists.xenproject.org Cc: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v6 3/7] x86/hvm: Allow access to registers on the same page as MSI-X table Date: Fri, 26 Apr 2024 19:54:00 +0200 Message-ID: X-Mailer: git-send-email 2.44.0 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1714154152926100013 Some devices (notably Intel Wifi 6 AX210 card) keep auxiliary registers on the same page as MSI-X table. Device model (especially one in stubdomain) cannot really handle those, as direct writes to that page is refused (page is on the mmio_ro_ranges list). Instead, extend msixtbl_mmio_ops to handle such accesses too. Doing this, requires correlating read/write location with guest of MSI-X table address. Since QEMU doesn't map MSI-X table to the guest, it requires msixtbl_entry->gtable, which is HVM-only. Similar feature for PV would need to be done separately. This will be also used to read Pending Bit Array, if it lives on the same page, making QEMU not needing /dev/mem access at all (especially helpful with lockdown enabled in dom0). If PBA lives on another page, QEMU will map it to the guest directly. If PBA lives on the same page, discard writes and log a message. Technically, writes outside of PBA could be allowed, but at this moment the precise location of PBA isn't saved, and also no known device abuses the spec in this way (at least yet). To access those registers, msixtbl_mmio_ops need the relevant page mapped. MSI handling already has infrastructure for that, using fixmap, so try to map first/last page of the MSI-X table (if necessary) and save their fixmap indexes. Note that msix_get_fixmap() does reference counting and reuses existing mapping, so just call it directly, even if the page was mapped before. Also, it uses a specific range of fixmap indexes which doesn't include 0, so use 0 as default ("not mapped") value - which simplifies code a bit. GCC 12.2.1 gets confused about 'desc' variable: arch/x86/hvm/vmsi.c: In function =E2=80=98msixtbl_range=E2=80=99: arch/x86/hvm/vmsi.c:553:8: error: =E2=80=98desc=E2=80=99 may be used un= initialized [-Werror=3Dmaybe-uninitialized] 553 | if ( desc ) | ^ arch/x86/hvm/vmsi.c:537:28: note: =E2=80=98desc=E2=80=99 was declared h= ere 537 | const struct msi_desc *desc; | ^~~~ It's conditional initialization is actually correct (in the case where it isn't initialized, function returns early), but to avoid build failure initialize it explicitly to NULL anyway. Signed-off-by: Marek Marczykowski-G=C3=B3recki Reviewed-by: Jan Beulich --- Changes in v6: - use MSIX_CHECK_WARN macro - extend assert on fixmap_idx - add break in default label, after ASSERT_UNREACHABLE(), and move setting default there - style fixes Changes in v5: - style fixes - include GCC version in the commit message - warn only once (per domain, per device) about failed adjacent access Changes in v4: - drop same_page parameter of msixtbl_find_entry(), distinguish two cases in relevant callers - rename adj_access_table_idx to adj_access_idx - code style fixes - drop alignment check in adjacent_{read,write}() - all callers already have it earlier - delay mapping first/last MSI-X pages until preparing device for a passthrough v3: - merge handling into msixtbl_mmio_ops - extend commit message v2: - adjust commit message - pass struct domain to msixtbl_page_handler_get_hwaddr() - reduce local variables used only once - log a warning if write is forbidden if MSI-X and PBA lives on the same page - do not passthrough unaligned accesses - handle accesses both before and after MSI-X table --- xen/arch/x86/hvm/vmsi.c | 200 ++++++++++++++++++++++++++++++++-- xen/arch/x86/include/asm/msi.h | 5 +- xen/arch/x86/msi.c | 41 +++++++- 3 files changed, 236 insertions(+), 10 deletions(-) diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c index 999917983789..230e3a5dee3f 100644 --- a/xen/arch/x86/hvm/vmsi.c +++ b/xen/arch/x86/hvm/vmsi.c @@ -180,6 +180,10 @@ static bool msixtbl_initialised(const struct domain *d) return d->arch.hvm.msixtbl_list.next; } =20 +/* + * Lookup an msixtbl_entry on the same page as given addr. It's up to the + * caller to check if address is strictly part of the table - if relevant. + */ static struct msixtbl_entry *msixtbl_find_entry( struct vcpu *v, unsigned long addr) { @@ -187,8 +191,8 @@ static struct msixtbl_entry *msixtbl_find_entry( struct domain *d =3D v->domain; =20 list_for_each_entry( entry, &d->arch.hvm.msixtbl_list, list ) - if ( addr >=3D entry->gtable && - addr < entry->gtable + entry->table_len ) + if ( PFN_DOWN(addr) >=3D PFN_DOWN(entry->gtable) && + PFN_DOWN(addr) <=3D PFN_DOWN(entry->gtable + entry->table_len= - 1) ) return entry; =20 return NULL; @@ -213,6 +217,138 @@ static struct msi_desc *msixtbl_addr_to_desc( return NULL; } =20 +/* + * Returns: + * - ADJACENT_DONT_HANDLE if no handling should be done + * - ADJACENT_DISCARD_WRITE if write should be discarded + * - a fixmap idx to use for handling + */ +#define ADJACENT_DONT_HANDLE UINT_MAX +#define ADJACENT_DISCARD_WRITE (UINT_MAX - 1) +static unsigned int adjacent_handle( + const struct msixtbl_entry *entry, unsigned long addr, bool write) +{ + unsigned int adj_type; + struct arch_msix *msix; + + if ( !entry || !entry->pdev ) + return ADJACENT_DONT_HANDLE; + + if ( PFN_DOWN(addr) =3D=3D PFN_DOWN(entry->gtable) && addr < entry->gt= able ) + adj_type =3D ADJ_IDX_FIRST; + else if ( PFN_DOWN(addr) =3D=3D PFN_DOWN(entry->gtable + entry->table_= len - 1) && + addr >=3D entry->gtable + entry->table_len ) + adj_type =3D ADJ_IDX_LAST; + else + return ADJACENT_DONT_HANDLE; + + msix =3D entry->pdev->msix; + ASSERT(msix); + + if ( !msix->adj_access_idx[adj_type] ) + { + if ( MSIX_CHECK_WARN(msix, entry->pdev->domain->domain_id, + adjacent_not_initialized) ) + gprintk(XENLOG_WARNING, + "Page for adjacent(%d) MSI-X table access not initiali= zed for %pp (addr %#lx, gtable %#lx\n", + adj_type, &entry->pdev->sbdf, addr, entry->gtable); + return ADJACENT_DONT_HANDLE; + } + + /* If PBA lives on the same page too, discard writes. */ + if ( write && + ((adj_type =3D=3D ADJ_IDX_LAST && + msix->table.last =3D=3D msix->pba.first) || + (adj_type =3D=3D ADJ_IDX_FIRST && + msix->table.first =3D=3D msix->pba.last)) ) + { + if ( MSIX_CHECK_WARN(msix, entry->pdev->domain->domain_id, + adjacent_pba) ) + gprintk(XENLOG_WARNING, + "MSI-X table and PBA of %pp live on the same page, " + "writing to other registers there is not implemented\n= ", + &entry->pdev->sbdf); + return ADJACENT_DISCARD_WRITE; + } + + return msix->adj_access_idx[adj_type]; +} + +static int adjacent_read( + unsigned int fixmap_idx, + paddr_t address, unsigned int len, uint64_t *pval) +{ + const void __iomem *hwaddr; + + ASSERT(fixmap_idx <=3D FIX_MSIX_IO_RESERV_END); + + hwaddr =3D fix_to_virt(fixmap_idx) + PAGE_OFFSET(address); + + switch ( len ) + { + case 1: + *pval =3D readb(hwaddr); + break; + + case 2: + *pval =3D readw(hwaddr); + break; + + case 4: + *pval =3D readl(hwaddr); + break; + + case 8: + *pval =3D readq(hwaddr); + break; + + default: + ASSERT_UNREACHABLE(); + *pval =3D ~0UL; + break; + } + + return X86EMUL_OKAY; +} + +static int adjacent_write( + unsigned int fixmap_idx, + paddr_t address, unsigned int len, uint64_t val) +{ + void __iomem *hwaddr; + + if ( fixmap_idx =3D=3D ADJACENT_DISCARD_WRITE ) + return X86EMUL_OKAY; + + ASSERT(fixmap_idx <=3D FIX_MSIX_IO_RESERV_END); + + hwaddr =3D fix_to_virt(fixmap_idx) + PAGE_OFFSET(address); + + switch ( len ) + { + case 1: + writeb(val, hwaddr); + break; + + case 2: + writew(val, hwaddr); + break; + + case 4: + writel(val, hwaddr); + break; + + case 8: + writeq(val, hwaddr); + break; + + default: + ASSERT_UNREACHABLE(); + } + + return X86EMUL_OKAY; +} + static int cf_check msixtbl_read( const struct hvm_io_handler *handler, uint64_t address, uint32_t len, uint64_t *pval) @@ -220,9 +356,10 @@ static int cf_check msixtbl_read( unsigned long offset; struct msixtbl_entry *entry; unsigned int nr_entry, index; + unsigned int adjacent_fixmap; int r =3D X86EMUL_UNHANDLEABLE; =20 - if ( (len !=3D 4 && len !=3D 8) || (address & (len - 1)) ) + if ( !IS_ALIGNED(address, len) ) return r; =20 rcu_read_lock(&msixtbl_rcu_lock); @@ -230,6 +367,21 @@ static int cf_check msixtbl_read( entry =3D msixtbl_find_entry(current, address); if ( !entry ) goto out; + + adjacent_fixmap =3D adjacent_handle(entry, address, false); + if ( adjacent_fixmap !=3D ADJACENT_DONT_HANDLE ) + { + r =3D adjacent_read(adjacent_fixmap, address, len, pval); + goto out; + } + + if ( address < entry->gtable || + address >=3D entry->gtable + entry->table_len ) + goto out; + + if ( len !=3D 4 && len !=3D 8 ) + goto out; + offset =3D address & (PCI_MSIX_ENTRY_SIZE - 1); =20 if ( offset !=3D PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET ) @@ -282,6 +434,7 @@ static int msixtbl_write(struct vcpu *v, unsigned long = address, int r =3D X86EMUL_UNHANDLEABLE; unsigned long flags; struct irq_desc *desc; + unsigned int adjacent_fixmap; =20 if ( !IS_ALIGNED(address, len) ) return X86EMUL_OKAY; @@ -291,6 +444,21 @@ static int msixtbl_write(struct vcpu *v, unsigned long= address, entry =3D msixtbl_find_entry(v, address); if ( !entry ) goto out; + + adjacent_fixmap =3D adjacent_handle(entry, address, true); + if ( adjacent_fixmap !=3D ADJACENT_DONT_HANDLE ) + { + r =3D adjacent_write(adjacent_fixmap, address, len, val); + goto out; + } + + if ( address < entry->gtable || + address >=3D entry->gtable + entry->table_len ) + goto out; + + if ( len !=3D 4 && len !=3D 8 ) + goto out; + nr_entry =3D array_index_nospec(((address - entry->gtable) / PCI_MSIX_ENTRY_SIZE), MAX_MSIX_TABLE_ENTRIES); @@ -356,8 +524,8 @@ static int cf_check _msixtbl_write( const struct hvm_io_handler *handler, uint64_t address, uint32_t len, uint64_t val) { - /* Ignore invalid length or unaligned writes. */ - if ( (len !=3D 4 && len !=3D 8) || !IS_ALIGNED(address, len) ) + /* Ignore unaligned writes. */ + if ( !IS_ALIGNED(address, len) ) return X86EMUL_OKAY; =20 /* @@ -374,14 +542,22 @@ static bool cf_check msixtbl_range( { struct vcpu *curr =3D current; unsigned long addr =3D r->addr; - const struct msi_desc *desc; + const struct msixtbl_entry *entry; + const struct msi_desc *desc =3D NULL; + unsigned int adjacent_fixmap; =20 ASSERT(r->type =3D=3D IOREQ_TYPE_COPY); =20 rcu_read_lock(&msixtbl_rcu_lock); - desc =3D msixtbl_addr_to_desc(msixtbl_find_entry(curr, addr), addr); + entry =3D msixtbl_find_entry(curr, addr); + adjacent_fixmap =3D adjacent_handle(entry, addr, false); + if ( adjacent_fixmap =3D=3D ADJACENT_DONT_HANDLE ) + desc =3D msixtbl_addr_to_desc(entry, addr); rcu_read_unlock(&msixtbl_rcu_lock); =20 + if ( adjacent_fixmap !=3D ADJACENT_DONT_HANDLE ) + return 1; + if ( desc ) return 1; =20 @@ -622,12 +798,16 @@ void msix_write_completion(struct vcpu *v) v->arch.hvm.hvm_io.msix_snoop_gpa ) { unsigned int token =3D hvmemul_cache_disable(v); - const struct msi_desc *desc; + const struct msi_desc *desc =3D NULL; + const struct msixtbl_entry *entry; uint32_t data; =20 rcu_read_lock(&msixtbl_rcu_lock); - desc =3D msixtbl_addr_to_desc(msixtbl_find_entry(v, snoop_addr), - snoop_addr); + entry =3D msixtbl_find_entry(v, snoop_addr); + if ( entry && + snoop_addr >=3D entry->gtable && + snoop_addr < entry->gtable + entry->table_len ) + desc =3D msixtbl_addr_to_desc(entry, snoop_addr); rcu_read_unlock(&msixtbl_rcu_lock); =20 if ( desc && diff --git a/xen/arch/x86/include/asm/msi.h b/xen/arch/x86/include/asm/msi.h index bcfdfd35345d..923b730d48b8 100644 --- a/xen/arch/x86/include/asm/msi.h +++ b/xen/arch/x86/include/asm/msi.h @@ -224,6 +224,9 @@ struct arch_msix { } table, pba; int table_refcnt[MAX_MSIX_TABLE_PAGES]; int table_idx[MAX_MSIX_TABLE_PAGES]; +#define ADJ_IDX_FIRST 0 +#define ADJ_IDX_LAST 1 + unsigned int adj_access_idx[2]; spinlock_t table_lock; bool host_maskall, guest_maskall; domid_t warned_domid; @@ -231,6 +234,8 @@ struct arch_msix { uint8_t all; struct { bool maskall : 1; + bool adjacent_not_initialized : 1; + bool adjacent_pba : 1; }; } warned_kind; }; diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c index 42c793426da3..c77b81896269 100644 --- a/xen/arch/x86/msi.c +++ b/xen/arch/x86/msi.c @@ -913,6 +913,36 @@ static int msix_capability_init(struct pci_dev *dev, list_add_tail(&entry->list, &dev->msi_list); *desc =3D entry; } + else + { + /* + * If the MSI-X table doesn't start at the page boundary, map the = first page for + * passthrough accesses. + */ + if ( PAGE_OFFSET(table_paddr) ) + { + int idx =3D msix_get_fixmap(msix, table_paddr, table_paddr); + + if ( idx > 0 ) + msix->adj_access_idx[ADJ_IDX_FIRST] =3D idx; + else + gprintk(XENLOG_ERR, "Failed to map first MSI-X table page:= %d\n", idx); + } + /* + * If the MSI-X table doesn't end on the page boundary, map the la= st page + * for passthrough accesses. + */ + if ( PAGE_OFFSET(table_paddr + msix->nr_entries * PCI_MSIX_ENTRY_S= IZE) ) + { + uint64_t entry_paddr =3D table_paddr + msix->nr_entries * PCI_= MSIX_ENTRY_SIZE; + int idx =3D msix_get_fixmap(msix, table_paddr, entry_paddr); + + if ( idx > 0 ) + msix->adj_access_idx[ADJ_IDX_LAST] =3D idx; + else + gprintk(XENLOG_ERR, "Failed to map last MSI-X table page: = %d\n", idx); + } + } =20 if ( !msix->used_entries ) { @@ -1079,6 +1109,17 @@ static void _pci_cleanup_msix(struct arch_msix *msix) msix->table.first =3D 0; msix->table.last =3D 0; =20 + if ( msix->adj_access_idx[ADJ_IDX_FIRST] ) + { + msix_put_fixmap(msix, msix->adj_access_idx[ADJ_IDX_FIRST]); + msix->adj_access_idx[ADJ_IDX_FIRST] =3D 0; + } + if ( msix->adj_access_idx[ADJ_IDX_LAST] ) + { + msix_put_fixmap(msix, msix->adj_access_idx[ADJ_IDX_LAST]); + msix->adj_access_idx[ADJ_IDX_LAST] =3D 0; + } + if ( rangeset_remove_range(mmio_ro_ranges, msix->pba.first, msix->pba.last) ) WARN(); 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1714154148915100005 /dev/mem access doesn't work in dom0 in lockdown and in stubdomain. Simulate this environment with removing /dev/mem device node. Full test for lockdown and stubdomain will come later, when all requirements will be in place. Signed-off-by: Marek Marczykowski-G=C3=B3recki Acked-by: Stefano Stabellini --- This can be applied only after QEMU change is committed. Otherwise the test will fail. --- automation/scripts/qubes-x86-64.sh | 2 ++ 1 file changed, 2 insertions(+) diff --git a/automation/scripts/qubes-x86-64.sh b/automation/scripts/qubes-= x86-64.sh index d81ed7b931cf..7eabc1bd6ad4 100755 --- a/automation/scripts/qubes-x86-64.sh +++ b/automation/scripts/qubes-x86-64.sh @@ -163,6 +163,8 @@ ifconfig eth0 up ifconfig xenbr0 up ifconfig xenbr0 192.168.0.1 =20 +# ensure QEMU wont have access /dev/mem +rm -f /dev/mem # get domU console content into test log tail -F /var/log/xen/console/guest-domU.log 2>/dev/null | sed -e \"s/^/(do= mU) /\" & xl create /etc/xen/domU.cfg --=20 git-series 0.9.1 From nobody Sun May 19 21:02:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1714154146628260.02076906245395; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1714154146908100001 Switch to a wifi card that has registers on a MSI-X page. This tests the "x86/hvm: Allow writes to registers on the same page as MSI-X table" feature. Switch it only for HVM test, because MSI-X adjacent write is not supported on PV. This requires also including drivers and firmware in system for tests. Remove firmware unrelated to the test, to not increase initrd size too much (all firmware takes over 100MB compressed). And finally adjusts test script to handle not only eth0 as a test device, but also wlan0 and connect it to the wifi network. Signed-off-by: Marek Marczykowski-G=C3=B3recki Reviewed-by: Stefano Stabellini --- This needs two new gitlab variables: WIFI_HW2_SSID and WIFI_HW2_PSK. I'll provide them in private. This change requires rebuilding test containers. This can be applied only after QEMU change is committed. Otherwise the test will fail. --- automation/gitlab-ci/test.yaml | 4 ++++ automation/scripts/qubes-x86-64.sh | 7 +++++++ automation/tests-artifacts/alpine/3.18.dockerfile | 7 +++++++ automation/tests-artifacts/kernel/6.1.19.dockerfile | 2 ++ 4 files changed, 20 insertions(+) diff --git a/automation/gitlab-ci/test.yaml b/automation/gitlab-ci/test.yaml index 8b7b2e4da92d..23a183fad967 100644 --- a/automation/gitlab-ci/test.yaml +++ b/automation/gitlab-ci/test.yaml @@ -193,6 +193,10 @@ adl-pci-pv-x86-64-gcc-debug: =20 adl-pci-hvm-x86-64-gcc-debug: extends: .adl-x86-64 + variables: + PCIDEV: "00:14.3" + WIFI_SSID: "$WIFI_HW2_SSID" + WIFI_PSK: "$WIFI_HW2_PSK" script: - ./automation/scripts/qubes-x86-64.sh pci-hvm 2>&1 | tee ${LOGFILE} needs: diff --git a/automation/scripts/qubes-x86-64.sh b/automation/scripts/qubes-= x86-64.sh index 7eabc1bd6ad4..60498ef1e89a 100755 --- a/automation/scripts/qubes-x86-64.sh +++ b/automation/scripts/qubes-x86-64.sh @@ -94,6 +94,13 @@ on_reboot =3D "destroy" domU_check=3D" set -x -e interface=3Deth0 +if [ -e /sys/class/net/wlan0 ]; then + interface=3Dwlan0 + set +x + wpa_passphrase "$WIFI_SSID" "$WIFI_PSK" > /etc/wpa_supplicant.conf + set -x + wpa_supplicant -B -iwlan0 -c /etc/wpa_supplicant.conf +fi ip link set \"\$interface\" up timeout 30s udhcpc -i \"\$interface\" pingip=3D\$(ip -o -4 r show default|cut -f 3 -d ' ') diff --git a/automation/tests-artifacts/alpine/3.18.dockerfile b/automation= /tests-artifacts/alpine/3.18.dockerfile index 9cde6c9ad4da..c323e266c7da 100644 --- a/automation/tests-artifacts/alpine/3.18.dockerfile +++ b/automation/tests-artifacts/alpine/3.18.dockerfile @@ -34,6 +34,13 @@ RUN \ apk add udev && \ apk add pciutils && \ apk add libelf && \ + apk add wpa_supplicant && \ + # Select firmware for hardware tests + apk add linux-firmware-other && \ + mkdir /lib/firmware-preserve && \ + mv /lib/firmware/iwlwifi-so-a0-gf-a0* /lib/firmware-preserve/ && \ + rm -rf /lib/firmware && \ + mv /lib/firmware-preserve /lib/firmware && \ \ # Xen cd / && \ diff --git a/automation/tests-artifacts/kernel/6.1.19.dockerfile b/automati= on/tests-artifacts/kernel/6.1.19.dockerfile index 3a4096780d20..84ed5dff23ae 100644 --- a/automation/tests-artifacts/kernel/6.1.19.dockerfile +++ b/automation/tests-artifacts/kernel/6.1.19.dockerfile @@ -32,6 +32,8 @@ RUN curl -fsSLO https://cdn.kernel.org/pub/linux/kernel/v= 6.x/linux-"$LINUX_VERSI make xen.config && \ scripts/config --enable BRIDGE && \ scripts/config --enable IGC && \ + scripts/config --enable IWLWIFI && \ + scripts/config --enable IWLMVM && \ cp .config .config.orig && \ cat .config.orig | grep XEN | grep =3Dm |sed 's/=3Dm/=3Dy/g' >> .confi= g && \ make -j$(nproc) bzImage && \ --=20 git-series 0.9.1 From nobody Sun May 19 21:02:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" This makes tests to use patched QEMU, to actually test the new behavior. --- Config.mk | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Config.mk b/Config.mk index a962f095ca16..5e220a1284e4 100644 --- a/Config.mk +++ b/Config.mk @@ -220,8 +220,8 @@ endif OVMF_UPSTREAM_URL ?=3D https://xenbits.xen.org/git-http/ovmf.git OVMF_UPSTREAM_REVISION ?=3D ba91d0292e593df8528b66f99c1b0b14fadc8e16 =20 -QEMU_UPSTREAM_URL ?=3D https://xenbits.xen.org/git-http/qemu-xen.git -QEMU_UPSTREAM_REVISION ?=3D master +QEMU_UPSTREAM_URL ?=3D https://github.com/marmarek/qemu +QEMU_UPSTREAM_REVISION ?=3D origin/msix =20 MINIOS_UPSTREAM_URL ?=3D https://xenbits.xen.org/git-http/mini-os.git MINIOS_UPSTREAM_REVISION ?=3D b6a5b4d72b88e5c4faed01f5a44505de022860fc --=20 git-series 0.9.1 From nobody Sun May 19 21:02:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" For testing, switch to my containers registry that includes containers rebuilt with changes in this series. --- automation/gitlab-ci/build.yaml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.y= aml index aac29ee13ab6..6957f06016b7 100644 --- a/automation/gitlab-ci/build.yaml +++ b/automation/gitlab-ci/build.yaml @@ -320,7 +320,7 @@ qemu-system-ppc64-8.1.0-ppc64-export: =20 alpine-3.18-rootfs-export: extends: .test-jobs-artifact-common - image: registry.gitlab.com/xen-project/xen/tests-artifacts/alpine:3.18 + image: registry.gitlab.com/xen-project/people/marmarek/xen/tests-artifac= ts/alpine:3.18 script: - mkdir binaries && cp /initrd.tar.gz binaries/initrd.tar.gz artifacts: @@ -331,7 +331,7 @@ alpine-3.18-rootfs-export: =20 kernel-6.1.19-export: extends: .test-jobs-artifact-common - image: registry.gitlab.com/xen-project/xen/tests-artifacts/kernel:6.1.19 + image: registry.gitlab.com/xen-project/people/marmarek/xen/tests-artifac= ts/kernel:6.1.19 script: - mkdir binaries && cp /bzImage binaries/bzImage artifacts: --=20 git-series 0.9.1