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b=RGYMcy2eytKPGBT5BQ7jLhlcxY5nIFpgLUdjZTM7592fp2FZJuMLFpBf0cBczqUDT2oq9MFhBDiYm3/lZUvdFHTAEyGuXHw0ifl8zHFviPM8WwiHHyZX6je20qX5jML9WKhMS4/S2+z7GaLXof34F6XpU5+MxjiOhediTQG1aCxl3ZDjZu9MtWlXs9H/x1TPxlB4kZvdvsVWOOrAykJy3YfwPbqafRXTJTKEbi4C/Z2De7G5NU4WFki+3cuPlQzwn3FcYaOoDfBrknIL8lCnlP2GGMhpJne6yclNv1wkYJtDdaQllXZIN3HPt9Jcll9V286kXP9t94fcANKOd7JYow== From: Volodymyr Babchuk To: "xen-devel@lists.xenproject.org" CC: Stewart Hildebrand , Oleksandr Andrushchenko , Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Wei Liu , Jun Nakajima , Kevin Tian , Paul Durrant , Volodymyr Babchuk Subject: [PATCH v9 02/16] vpci: use per-domain PCI lock to protect vpci structure Thread-Topic: [PATCH v9 02/16] vpci: use per-domain PCI lock to protect vpci structure Thread-Index: AQHZ2s9KfUsugiaE80OWAJ/SuT82fA== Date: Tue, 29 Aug 2023 23:19:42 +0000 Message-ID: <20230829231912.4091958-3-volodymyr_babchuk@epam.com> References: <20230829231912.4091958-1-volodymyr_babchuk@epam.com> In-Reply-To: <20230829231912.4091958-1-volodymyr_babchuk@epam.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.41.0 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: VI1PR03MB3710:EE_|AM7PR03MB6371:EE_ x-ms-office365-filtering-correlation-id: 3c7aa324-2cd4-4e57-048c-08dba8e66d6f x-ld-processed: b41b72d0-4e9f-4c26-8a69-f949f367c91d,ExtAddr x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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This lock can be used (and in a few cases is used right away) so that vpci removal can be performed while holding the lock in write mode. Previously such removal could race with vpci_read for example. When taking both d->pci_lock and pdev->vpci->lock they are should be taken in this exact order: d->pci_lock then pdev->vpci->lock to avoid possible deadlock situations. 1. Per-domain's pci_rwlock is used to protect pdev->vpci structure from being removed. 2. Writing the command register and ROM BAR register may trigger modify_bars to run, which in turn may access multiple pdevs while checking for the existing BAR's overlap. The overlapping check, if done under the read lock, requires vpci->lock to be acquired on both devices being compared, which may produce a deadlock. It is not possible to upgrade read lock to write lock in such a case. So, in order to prevent the deadlock, use d->pci_lock instead. To prevent deadlock while locking both hwdom->pci_lock and dom_xen->pci_lock, always lock hwdom first. All other code, which doesn't lead to pdev->vpci destruction and does not access multiple pdevs at the same time, can still use a combination of the read lock and pdev->vpci->lock. 3. Drop const qualifier where the new rwlock is used and this is appropriate. 4. Do not call process_pending_softirqs with any locks held. For that unlock prior the call and re-acquire the locks after. After re-acquiring the lock there is no need to check if pdev->vpci exists: - in apply_map because of the context it is called (no race condition possible) - for MSI/MSI-X debug code because it is called at the end of pdev->vpci access and no further access to pdev->vpci is made 5. Use d->pci_lock around for_each_pdev and pci_get_pdev_by_domain while accessing pdevs in vpci code. There is a possible lock inversion in MSI code, as some parts of it acquire pcidevs_lock() while already holding d->pci_lock. Suggested-by: Roger Pau Monné Suggested-by: Jan Beulich Signed-off-by: Oleksandr Andrushchenko Signed-off-by: Volodymyr Babchuk --- Changes in v9: - extended locked region to protect vpci_remove_device and vpci_add_handlers() calls - vpci_write() takes lock in the write mode to protect potential call to modify_bars() - renamed lock releasing function - removed ASSERT()s from msi code - added trylock in vpci_dump_msi Changes in v8: - changed d->vpci_lock to d->pci_lock - introducing d->pci_lock in a separate patch - extended locked region in vpci_process_pending - removed pcidevs_lockis vpci_dump_msi() - removed some changes as they are not needed with the new locking scheme - added handling for hwdom && dom_xen case --- xen/arch/x86/hvm/vmsi.c | 24 ++++++++-------- xen/arch/x86/hvm/vmx/vmx.c | 2 -- xen/arch/x86/irq.c | 15 +++++++--- xen/arch/x86/msi.c | 8 ++---- xen/drivers/passthrough/pci.c | 7 +++-- xen/drivers/vpci/header.c | 18 ++++++++++++ xen/drivers/vpci/msi.c | 22 +++++++++++++-- xen/drivers/vpci/msix.c | 52 ++++++++++++++++++++++++++++++----- xen/drivers/vpci/vpci.c | 46 +++++++++++++++++++++++++++++-- 9 files changed, 154 insertions(+), 40 deletions(-) diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c index 128f236362..fde76cc6b4 100644 --- a/xen/arch/x86/hvm/vmsi.c +++ b/xen/arch/x86/hvm/vmsi.c @@ -468,7 +468,7 @@ int msixtbl_pt_register(struct domain *d, struct pirq *pirq, uint64_t gtable) struct msixtbl_entry *entry, *new_entry; int r = -EINVAL; - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&d->pci_lock)); ASSERT(rw_is_write_locked(&d->event_lock)); if ( !msixtbl_initialised(d) ) @@ -538,7 +538,7 @@ void msixtbl_pt_unregister(struct domain *d, struct pirq *pirq) struct pci_dev *pdev; struct msixtbl_entry *entry; - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&d->pci_lock)); ASSERT(rw_is_write_locked(&d->event_lock)); if ( !msixtbl_initialised(d) ) @@ -684,7 +684,7 @@ static int vpci_msi_update(const struct pci_dev *pdev, uint32_t data, { unsigned int i; - ASSERT(pcidevs_locked()); + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); if ( (address & MSI_ADDR_BASE_MASK) != MSI_ADDR_HEADER ) { @@ -725,8 +725,8 @@ void vpci_msi_arch_update(struct vpci_msi *msi, const struct pci_dev *pdev) int rc; ASSERT(msi->arch.pirq != INVALID_PIRQ); + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); - pcidevs_lock(); for ( i = 0; i < msi->vectors && msi->arch.bound; i++ ) { struct xen_domctl_bind_pt_irq unbind = { @@ -745,7 +745,6 @@ void vpci_msi_arch_update(struct vpci_msi *msi, const struct pci_dev *pdev) msi->arch.bound = !vpci_msi_update(pdev, msi->data, msi->address, msi->vectors, msi->arch.pirq, msi->mask); - pcidevs_unlock(); } static int vpci_msi_enable(const struct pci_dev *pdev, unsigned int nr, @@ -778,15 +777,13 @@ int vpci_msi_arch_enable(struct vpci_msi *msi, const struct pci_dev *pdev, int rc; ASSERT(msi->arch.pirq == INVALID_PIRQ); + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); rc = vpci_msi_enable(pdev, vectors, 0); if ( rc < 0 ) return rc; msi->arch.pirq = rc; - - pcidevs_lock(); msi->arch.bound = !vpci_msi_update(pdev, msi->data, msi->address, vectors, msi->arch.pirq, msi->mask); - pcidevs_unlock(); return 0; } @@ -797,8 +794,8 @@ static void vpci_msi_disable(const struct pci_dev *pdev, int pirq, unsigned int i; ASSERT(pirq != INVALID_PIRQ); + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); - pcidevs_lock(); for ( i = 0; i < nr && bound; i++ ) { struct xen_domctl_bind_pt_irq bind = { @@ -814,7 +811,6 @@ static void vpci_msi_disable(const struct pci_dev *pdev, int pirq, write_lock(&pdev->domain->event_lock); unmap_domain_pirq(pdev->domain, pirq); write_unlock(&pdev->domain->event_lock); - pcidevs_unlock(); } void vpci_msi_arch_disable(struct vpci_msi *msi, const struct pci_dev *pdev) @@ -854,6 +850,8 @@ int vpci_msix_arch_enable_entry(struct vpci_msix_entry *entry, int rc; ASSERT(entry->arch.pirq == INVALID_PIRQ); + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); + rc = vpci_msi_enable(pdev, vmsix_entry_nr(pdev->vpci->msix, entry), table_base); if ( rc < 0 ) @@ -861,7 +859,6 @@ int vpci_msix_arch_enable_entry(struct vpci_msix_entry *entry, entry->arch.pirq = rc; - pcidevs_lock(); rc = vpci_msi_update(pdev, entry->data, entry->addr, 1, entry->arch.pirq, entry->masked); if ( rc ) @@ -869,7 +866,6 @@ int vpci_msix_arch_enable_entry(struct vpci_msix_entry *entry, vpci_msi_disable(pdev, entry->arch.pirq, 1, false); entry->arch.pirq = INVALID_PIRQ; } - pcidevs_unlock(); return rc; } @@ -895,6 +891,8 @@ int vpci_msix_arch_print(const struct vpci_msix *msix) { unsigned int i; + ASSERT(rw_is_locked(&msix->pdev->domain->pci_lock)); + for ( i = 0; i < msix->max_entries; i++ ) { const struct vpci_msix_entry *entry = &msix->entries[i]; @@ -913,7 +911,9 @@ int vpci_msix_arch_print(const struct vpci_msix *msix) struct pci_dev *pdev = msix->pdev; spin_unlock(&msix->pdev->vpci->lock); + read_unlock(&pdev->domain->pci_lock); process_pending_softirqs(); + read_lock(&pdev->domain->pci_lock); /* NB: we assume that pdev cannot go away for an alive domain. */ if ( !pdev->vpci || !spin_trylock(&pdev->vpci->lock) ) return -EBUSY; diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index 1edc7f1e91..545a27796e 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -413,8 +413,6 @@ static int cf_check vmx_pi_update_irte(const struct vcpu *v, spin_unlock_irq(&desc->lock); - ASSERT(pcidevs_locked()); - return iommu_update_ire_from_msi(msi_desc, &msi_desc->msg); unlock_out: diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c index 6abfd81621..cb99ae5392 100644 --- a/xen/arch/x86/irq.c +++ b/xen/arch/x86/irq.c @@ -2157,7 +2157,7 @@ int map_domain_pirq( struct pci_dev *pdev; unsigned int nr = 0; - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&d->pci_lock)); ret = -ENODEV; if ( !cpu_has_apic ) @@ -2314,7 +2314,7 @@ int unmap_domain_pirq(struct domain *d, int pirq) if ( (pirq < 0) || (pirq >= d->nr_pirqs) ) return -EINVAL; - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&d->pci_lock)); ASSERT(rw_is_write_locked(&d->event_lock)); info = pirq_info(d, pirq); @@ -2908,7 +2908,13 @@ int allocate_and_map_msi_pirq(struct domain *d, int index, int *pirq_p, msi->irq = irq; - pcidevs_lock(); + /* + * If we are called via vPCI->vMSI path, we already are holding + * d->pci_lock so there is no need to take pcidevs_lock, as it + * will cause lock inversion. + */ + if ( !rw_is_locked(&d->pci_lock) ) + pcidevs_lock(); /* Verify or get pirq. */ write_lock(&d->event_lock); pirq = allocate_pirq(d, index, *pirq_p, irq, type, &msi->entry_nr); @@ -2924,7 +2930,8 @@ int allocate_and_map_msi_pirq(struct domain *d, int index, int *pirq_p, done: write_unlock(&d->event_lock); - pcidevs_unlock(); + if ( !rw_is_locked(&d->pci_lock) ) + pcidevs_unlock(); if ( ret ) { switch ( type ) diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c index d0bf63df1d..ba2963b7d2 100644 --- a/xen/arch/x86/msi.c +++ b/xen/arch/x86/msi.c @@ -613,7 +613,7 @@ static int msi_capability_init(struct pci_dev *dev, u8 slot = PCI_SLOT(dev->devfn); u8 func = PCI_FUNC(dev->devfn); - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&dev->domain->pci_lock)); pos = pci_find_cap_offset(seg, bus, slot, func, PCI_CAP_ID_MSI); if ( !pos ) return -ENODEV; @@ -783,7 +783,7 @@ static int msix_capability_init(struct pci_dev *dev, if ( !pos ) return -ENODEV; - ASSERT(pcidevs_locked()); + ASSERT(pcidevs_locked() || rw_is_locked(&dev->domain->pci_lock)); control = pci_conf_read16(dev->sbdf, msix_control_reg(pos)); /* @@ -1000,7 +1000,6 @@ static int __pci_enable_msi(struct msi_info *msi, struct msi_desc **desc) struct pci_dev *pdev; struct msi_desc *old_desc; - ASSERT(pcidevs_locked()); pdev = pci_get_pdev(NULL, msi->sbdf); if ( !pdev ) return -ENODEV; @@ -1055,7 +1054,6 @@ static int __pci_enable_msix(struct msi_info *msi, struct msi_desc **desc) struct pci_dev *pdev; struct msi_desc *old_desc; - ASSERT(pcidevs_locked()); pdev = pci_get_pdev(NULL, msi->sbdf); if ( !pdev || !pdev->msix ) return -ENODEV; @@ -1170,8 +1168,6 @@ int pci_prepare_msix(u16 seg, u8 bus, u8 devfn, bool off) */ int pci_enable_msi(struct msi_info *msi, struct msi_desc **desc) { - ASSERT(pcidevs_locked()); - if ( !use_msi ) return -EPERM; diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index 79ca928672..4f18293900 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -752,7 +752,6 @@ int pci_add_device(u16 seg, u8 bus, u8 devfn, pdev->domain = hardware_domain; write_lock(&hardware_domain->pci_lock); list_add(&pdev->domain_list, &hardware_domain->pdev_list); - write_unlock(&hardware_domain->pci_lock); /* * For devices not discovered by Xen during boot, add vPCI handlers @@ -762,17 +761,17 @@ int pci_add_device(u16 seg, u8 bus, u8 devfn, if ( ret ) { printk(XENLOG_ERR "Setup of vPCI failed: %d\n", ret); - write_lock(&hardware_domain->pci_lock); list_del(&pdev->domain_list); write_unlock(&hardware_domain->pci_lock); pdev->domain = NULL; goto out; } + write_unlock(&hardware_domain->pci_lock); ret = iommu_add_device(pdev); if ( ret ) { - vpci_remove_device(pdev); write_lock(&hardware_domain->pci_lock); + vpci_remove_device(pdev); list_del(&pdev->domain_list); write_unlock(&hardware_domain->pci_lock); pdev->domain = NULL; @@ -1147,7 +1146,9 @@ static void __hwdom_init setup_one_hwdom_device(const struct setup_hwdom *ctxt, } while ( devfn != pdev->devfn && PCI_SLOT(devfn) == PCI_SLOT(pdev->devfn) ); + write_lock(&ctxt->d->pci_lock); err = vpci_add_handlers(pdev); + write_unlock(&ctxt->d->pci_lock); if ( err ) printk(XENLOG_ERR "setup of vPCI for d%d failed: %d\n", ctxt->d->domain_id, err); diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 60f7049e34..177a6b57a5 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -172,6 +172,7 @@ bool vpci_process_pending(struct vcpu *v) if ( rc == -ERESTART ) return true; + write_lock(&v->domain->pci_lock); spin_lock(&v->vpci.pdev->vpci->lock); /* Disable memory decoding unconditionally on failure. */ modify_decoding(v->vpci.pdev, @@ -190,6 +191,7 @@ bool vpci_process_pending(struct vcpu *v) * failure. */ vpci_remove_device(v->vpci.pdev); + write_unlock(&v->domain->pci_lock); } return false; @@ -201,8 +203,20 @@ static int __init apply_map(struct domain *d, const struct pci_dev *pdev, struct map_data data = { .d = d, .map = true }; int rc; + ASSERT(rw_is_locked(&d->pci_lock)); + while ( (rc = rangeset_consume_ranges(mem, map_range, &data)) == -ERESTART ) + { + /* + * It's safe to drop and reacquire the lock in this context + * without risking pdev disappearing because devices cannot be + * removed until the initial domain has been started. + */ + read_unlock(&d->pci_lock); process_pending_softirqs(); + read_lock(&d->pci_lock); + } + rangeset_destroy(mem); if ( !rc ) modify_decoding(pdev, cmd, false); @@ -243,6 +257,8 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) unsigned int i; int rc; + ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); + if ( !mem ) return -ENOMEM; @@ -522,6 +538,8 @@ static int cf_check init_bars(struct pci_dev *pdev) struct vpci_bar *bars = header->bars; int rc; + ASSERT(rw_is_locked(&pdev->domain->pci_lock)); + switch ( pci_conf_read8(pdev->sbdf, PCI_HEADER_TYPE) & 0x7f ) { case PCI_HEADER_TYPE_NORMAL: diff --git a/xen/drivers/vpci/msi.c b/xen/drivers/vpci/msi.c index 8f2b59e61a..a0733bb2cb 100644 --- a/xen/drivers/vpci/msi.c +++ b/xen/drivers/vpci/msi.c @@ -265,7 +265,7 @@ REGISTER_VPCI_INIT(init_msi, VPCI_PRIORITY_LOW); void vpci_dump_msi(void) { - const struct domain *d; + struct domain *d; rcu_read_lock(&domlist_read_lock); for_each_domain ( d ) @@ -277,6 +277,9 @@ void vpci_dump_msi(void) printk("vPCI MSI/MSI-X d%d\n", d->domain_id); + if ( !read_trylock(&d->pci_lock) ) + continue; + for_each_pdev ( d, pdev ) { const struct vpci_msi *msi; @@ -318,15 +321,28 @@ void vpci_dump_msi(void) * holding the lock. */ printk("unable to print all MSI-X entries: %d\n", rc); - process_pending_softirqs(); - continue; + goto pdev_done; } } spin_unlock(&pdev->vpci->lock); + pdev_done: + /* + * Unlock lock to process pending softirqs. This is + * potentially unsafe, as d->pdev_list can be changed in + * meantime. + */ + read_unlock(&d->pci_lock); process_pending_softirqs(); + if ( !read_trylock(&d->pci_lock) ) + { + printk("unable to access other devices for the domain\n"); + goto domain_done; + } } + read_unlock(&d->pci_lock); } + domain_done: rcu_read_unlock(&domlist_read_lock); } diff --git a/xen/drivers/vpci/msix.c b/xen/drivers/vpci/msix.c index f9df506f29..f8c5bd393b 100644 --- a/xen/drivers/vpci/msix.c +++ b/xen/drivers/vpci/msix.c @@ -147,6 +147,8 @@ static struct vpci_msix *msix_find(const struct domain *d, unsigned long addr) { struct vpci_msix *msix; + ASSERT(rw_is_locked(&d->pci_lock)); + list_for_each_entry ( msix, &d->arch.hvm.msix_tables, next ) { const struct vpci_bar *bars = msix->pdev->vpci->header.bars; @@ -163,7 +165,13 @@ static struct vpci_msix *msix_find(const struct domain *d, unsigned long addr) static int cf_check msix_accept(struct vcpu *v, unsigned long addr) { - return !!msix_find(v->domain, addr); + int rc; + + read_lock(&v->domain->pci_lock); + rc = !!msix_find(v->domain, addr); + read_unlock(&v->domain->pci_lock); + + return rc; } static bool access_allowed(const struct pci_dev *pdev, unsigned long addr, @@ -358,21 +366,35 @@ static int adjacent_read(const struct domain *d, const struct vpci_msix *msix, static int cf_check msix_read( struct vcpu *v, unsigned long addr, unsigned int len, unsigned long *data) { - const struct domain *d = v->domain; - struct vpci_msix *msix = msix_find(d, addr); + struct domain *d = v->domain; + struct vpci_msix *msix; const struct vpci_msix_entry *entry; unsigned int offset; *data = ~0ul; + read_lock(&d->pci_lock); + + msix = msix_find(d, addr); if ( !msix ) + { + read_unlock(&d->pci_lock); return X86EMUL_RETRY; + } if ( adjacent_handle(msix, addr) ) - return adjacent_read(d, msix, addr, len, data); + { + int rc = adjacent_read(d, msix, addr, len, data); + + read_unlock(&d->pci_lock); + return rc; + } if ( !access_allowed(msix->pdev, addr, len) ) + { + read_unlock(&d->pci_lock); return X86EMUL_OKAY; + } spin_lock(&msix->pdev->vpci->lock); entry = get_entry(msix, addr); @@ -404,6 +426,7 @@ static int cf_check msix_read( break; } spin_unlock(&msix->pdev->vpci->lock); + read_unlock(&d->pci_lock); return X86EMUL_OKAY; } @@ -491,19 +514,33 @@ static int adjacent_write(const struct domain *d, const struct vpci_msix *msix, static int cf_check msix_write( struct vcpu *v, unsigned long addr, unsigned int len, unsigned long data) { - const struct domain *d = v->domain; - struct vpci_msix *msix = msix_find(d, addr); + struct domain *d = v->domain; + struct vpci_msix *msix; struct vpci_msix_entry *entry; unsigned int offset; + read_lock(&d->pci_lock); + + msix = msix_find(d, addr); if ( !msix ) + { + read_unlock(&d->pci_lock); return X86EMUL_RETRY; + } if ( adjacent_handle(msix, addr) ) - return adjacent_write(d, msix, addr, len, data); + { + int rc = adjacent_write(d, msix, addr, len, data); + + read_unlock(&d->pci_lock); + return rc; + } if ( !access_allowed(msix->pdev, addr, len) ) + { + read_unlock(&d->pci_lock); return X86EMUL_OKAY; + } spin_lock(&msix->pdev->vpci->lock); entry = get_entry(msix, addr); @@ -579,6 +616,7 @@ static int cf_check msix_write( break; } spin_unlock(&msix->pdev->vpci->lock); + read_unlock(&d->pci_lock); return X86EMUL_OKAY; } diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index d73fa76302..34fff2ef2d 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -38,6 +38,8 @@ extern vpci_register_init_t *const __end_vpci_array[]; void vpci_remove_device(struct pci_dev *pdev) { + ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); + if ( !has_vpci(pdev->domain) || !pdev->vpci ) return; @@ -73,6 +75,8 @@ int vpci_add_handlers(struct pci_dev *pdev) const unsigned long *ro_map; int rc = 0; + ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); + if ( !has_vpci(pdev->domain) ) return 0; @@ -326,11 +330,12 @@ static uint32_t merge_result(uint32_t data, uint32_t new, unsigned int size, uint32_t vpci_read(pci_sbdf_t sbdf, unsigned int reg, unsigned int size) { - const struct domain *d = current->domain; + struct domain *d = current->domain; const struct pci_dev *pdev; const struct vpci_register *r; unsigned int data_offset = 0; uint32_t data = ~(uint32_t)0; + rwlock_t *lock; if ( !size ) { @@ -342,11 +347,21 @@ uint32_t vpci_read(pci_sbdf_t sbdf, unsigned int reg, unsigned int size) * Find the PCI dev matching the address, which for hwdom also requires * consulting DomXEN. Passthrough everything that's not trapped. */ + lock = &d->pci_lock; + read_lock(lock); pdev = pci_get_pdev(d, sbdf); if ( !pdev && is_hardware_domain(d) ) + { + read_unlock(lock); + lock = &dom_xen->pci_lock; + read_lock(lock); pdev = pci_get_pdev(dom_xen, sbdf); + } if ( !pdev || !pdev->vpci ) + { + read_unlock(lock); return vpci_read_hw(sbdf, reg, size); + } spin_lock(&pdev->vpci->lock); @@ -392,6 +407,7 @@ uint32_t vpci_read(pci_sbdf_t sbdf, unsigned int reg, unsigned int size) ASSERT(data_offset < size); } spin_unlock(&pdev->vpci->lock); + read_unlock(lock); if ( data_offset < size ) { @@ -431,10 +447,23 @@ static void vpci_write_helper(const struct pci_dev *pdev, r->private); } +/* Helper function to unlock locks taken by vpci_write in proper order */ +static void release_domain_locks(struct domain *d) +{ + ASSERT(rw_is_write_locked(&d->pci_lock)); + + if ( is_hardware_domain(d) ) + { + ASSERT(rw_is_write_locked(&dom_xen->pci_lock)); + write_unlock(&dom_xen->pci_lock); + } + write_unlock(&d->pci_lock); +} + void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, uint32_t data) { - const struct domain *d = current->domain; + struct domain *d = current->domain; const struct pci_dev *pdev; const struct vpci_register *r; unsigned int data_offset = 0; @@ -447,8 +476,16 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, /* * Find the PCI dev matching the address, which for hwdom also requires - * consulting DomXEN. Passthrough everything that's not trapped. + * consulting DomXEN. Passthrough everything that's not trapped. + * If this is hwdom, we need to hold locks for both domain in case if + * modify_bars() is called */ + write_lock(&d->pci_lock); + + /* dom_xen->pci_lock always should be taken second to prevent deadlock */ + if ( is_hardware_domain(d) ) + write_lock(&dom_xen->pci_lock); + pdev = pci_get_pdev(d, sbdf); if ( !pdev && is_hardware_domain(d) ) pdev = pci_get_pdev(dom_xen, sbdf); @@ -459,6 +496,8 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, if ( !ro_map || !test_bit(sbdf.bdf, ro_map) ) vpci_write_hw(sbdf, reg, size, data); + + release_domain_locks(d); return; } @@ -498,6 +537,7 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, ASSERT(data_offset < size); } spin_unlock(&pdev->vpci->lock); + release_domain_locks(d); if ( data_offset < size ) /* Tailing gap, write the remaining. */