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[176.36.245.220]) by smtp.gmail.com with ESMTPSA id 13sm251099ljf.51.2021.09.30.00.52.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 00:52:30 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: b232defa-7f1f-4f21-a814-d8a592319df9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=UYb/ANGHKxQ/isBZ8jDr5PIwHDVyjvEKH2Wdujmg3Lc=; b=WsHQwrDr4Uem1Ds+1pFynepoQjyxeZ3K137PcLJmgDm7Mrrm1d4dj6crZNwwcehEsM rGxflMhwppxr+6Em7Ci3Czif9QiZf01ignkNZku1A2kDqHxa5dAstqUNVHxYq4DrTdAe FA6fxmriL3u0ohz55idRcIQB7Hof+Ysk65j+f8vxzl9zHHj/ESrkw3INkTBsub6Nc2uN ZgEi2Q2Y+Uqdgi7FhVG5x/sfpr1/QFBKHfNzcXPy4itnubQpBs585W8SvHSQF0HeBWNK wRF+reCZw69rw/RCSITlGRJwLzXYfOEH4H0fLtextUzkDroqcXaPYTayGMsYeLMXoG5M tfiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=UYb/ANGHKxQ/isBZ8jDr5PIwHDVyjvEKH2Wdujmg3Lc=; b=4zAgsL6XanX8+iKOPhsRXjsQlYX/hUouKk6oyNSNTbs6sb8Rl5/b1TFX+WGj6CQ04t 6602IAcLo65bYVIWWmNAkBiSJwyw9Iw8o1cKQBDogATvh3dACclIxwFFCD/VyfBE2ZYI JQeBOLMvJd+T1BLFPvIA5T4FnyL1NrKbw7JRvMLA3Ng+rnSzgmNa39lgmsRuQkmm+urB 3fA9SFbay3JoPM3ifX6n4GJqSNcajW098UjhYaofQhCaFCln6yFxbIDYJDKbhaUuTpNN B7ga0FmEYwq2qfVg6C8PhFxmjjfDIZODhirwWtdoM/ZmNgnG3/2FmgCargyb6G35vGsI /9wg== X-Gm-Message-State: AOAM530O8wjJY05sKi9HCdsCe+GuNhpnXAA0V5SrKyb0WQIlTHiFx2Sf B7pducG1RTtofNuGpj3lWTJONTp0g68= X-Google-Smtp-Source: ABdhPJxtPd0OLutL4StYyqSyghgjofxpr4rhGLOzhT+xWd9gDCurFN9nBS2/pZyCBlB8otMRHCex5g== X-Received: by 2002:a05:6512:c9:: with SMTP id c9mr4363608lfp.142.1632988351070; Thu, 30 Sep 2021 00:52:31 -0700 (PDT) From: Oleksandr Andrushchenko To: xen-devel@lists.xenproject.org Cc: julien@xen.org, sstabellini@kernel.org, oleksandr_tyshchenko@epam.com, volodymyr_babchuk@epam.com, Artem_Mygaiev@epam.com, roger.pau@citrix.com, jbeulich@suse.com, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v3 06/11] vpci/header: Handle p2m range sets per BAR Date: Thu, 30 Sep 2021 10:52:18 +0300 Message-Id: <20210930075223.860329-7-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210930075223.860329-1-andr2000@gmail.com> References: <20210930075223.860329-1-andr2000@gmail.com> MIME-Version: 1.0 From: Oleksandr Andrushchenko Instead of handling a single range set, that contains all the memory regions of all the BARs and ROM, have them per BAR. This is in preparation of making non-identity mappings in p2m for the MMIOs/ROM. Signed-off-by: Oleksandr Andrushchenko --- xen/drivers/vpci/header.c | 172 ++++++++++++++++++++++++++------------ xen/include/xen/vpci.h | 3 +- 2 files changed, 122 insertions(+), 53 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index ec4d215f36ff..9c603d26d302 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -131,49 +131,75 @@ static void modify_decoding(const struct pci_dev *pdev, uint16_t cmd, bool vpci_process_pending(struct vcpu *v) { - if ( v->vpci.mem ) + if ( v->vpci.num_mem_ranges ) { struct map_data data = { .d = v->domain, .map = v->vpci.cmd & PCI_COMMAND_MEMORY, }; - int rc = rangeset_consume_ranges(v->vpci.mem, map_range, &data); + struct pci_dev *pdev = v->vpci.pdev; + struct vpci_header *header = &pdev->vpci->header; + unsigned int i; - if ( rc == -ERESTART ) - return true; + for ( i = 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar = &header->bars[i]; + int rc; - spin_lock(&v->vpci.pdev->vpci->lock); - /* Disable memory decoding unconditionally on failure. */ - modify_decoding(v->vpci.pdev, - rc ? v->vpci.cmd & ~PCI_COMMAND_MEMORY : v->vpci.cmd, - !rc && v->vpci.rom_only); - spin_unlock(&v->vpci.pdev->vpci->lock); + if ( !bar->mem ) + continue; - rangeset_destroy(v->vpci.mem); - v->vpci.mem = NULL; - if ( rc ) - /* - * FIXME: in case of failure remove the device from the domain. - * Note that there might still be leftover mappings. While this is - * safe for Dom0, for DomUs the domain will likely need to be - * killed in order to avoid leaking stale p2m mappings on - * failure. - */ - vpci_remove_device(v->vpci.pdev); + rc = rangeset_consume_ranges(bar->mem, map_range, &data); + + if ( rc == -ERESTART ) + return true; + + spin_lock(&pdev->vpci->lock); + /* Disable memory decoding unconditionally on failure. */ + modify_decoding(pdev, + rc ? v->vpci.cmd & ~PCI_COMMAND_MEMORY : v->vpci.cmd, + !rc && v->vpci.rom_only); + spin_unlock(&pdev->vpci->lock); + + rangeset_destroy(bar->mem); + bar->mem = NULL; + v->vpci.num_mem_ranges--; + if ( rc ) + /* + * FIXME: in case of failure remove the device from the domain. + * Note that there might still be leftover mappings. While this is + * safe for Dom0, for DomUs the domain will likely need to be + * killed in order to avoid leaking stale p2m mappings on + * failure. + */ + vpci_remove_device(pdev); + } } return false; } static int __init apply_map(struct domain *d, const struct pci_dev *pdev, - struct rangeset *mem, uint16_t cmd) + uint16_t cmd) { struct map_data data = { .d = d, .map = true }; - int rc; + struct vpci_header *header = &pdev->vpci->header; + int rc = 0; + unsigned int i; + + for ( i = 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar = &header->bars[i]; - while ( (rc = rangeset_consume_ranges(mem, map_range, &data)) == -ERESTART ) - process_pending_softirqs(); - rangeset_destroy(mem); + if ( !bar->mem ) + continue; + + while ( (rc = rangeset_consume_ranges(bar->mem, map_range, + &data)) == -ERESTART ) + process_pending_softirqs(); + rangeset_destroy(bar->mem); + bar->mem = NULL; + } if ( !rc ) modify_decoding(pdev, cmd, false); @@ -181,7 +207,7 @@ static int __init apply_map(struct domain *d, const struct pci_dev *pdev, } static void defer_map(struct domain *d, struct pci_dev *pdev, - struct rangeset *mem, uint16_t cmd, bool rom_only) + uint16_t cmd, bool rom_only, uint8_t num_mem_ranges) { struct vcpu *curr = current; @@ -192,9 +218,9 @@ static void defer_map(struct domain *d, struct pci_dev *pdev, * started for the same device if the domain is not well-behaved. */ curr->vpci.pdev = pdev; - curr->vpci.mem = mem; curr->vpci.cmd = cmd; curr->vpci.rom_only = rom_only; + curr->vpci.num_mem_ranges = num_mem_ranges; /* * Raise a scheduler softirq in order to prevent the guest from resuming * execution with pending mapping operations, to trigger the invocation @@ -206,42 +232,47 @@ static void defer_map(struct domain *d, struct pci_dev *pdev, static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) { struct vpci_header *header = &pdev->vpci->header; - struct rangeset *mem = rangeset_new(NULL, NULL, 0); struct pci_dev *tmp, *dev = NULL; const struct vpci_msix *msix = pdev->vpci->msix; - unsigned int i; + unsigned int i, j; int rc; - - if ( !mem ) - return -ENOMEM; + uint8_t num_mem_ranges; /* - * Create a rangeset that represents the current device BARs memory region + * Create a rangeset per BAR that represents the current device memory region * and compare it against all the currently active BAR memory regions. If * an overlap is found, subtract it from the region to be mapped/unmapped. * - * First fill the rangeset with all the BARs of this device or with the ROM + * First fill the rangesets with all the BARs of this device or with the ROM * BAR only, depending on whether the guest is toggling the memory decode * bit of the command register, or the enable bit of the ROM BAR register. */ for ( i = 0; i < ARRAY_SIZE(header->bars); i++ ) { - const struct vpci_bar *bar = &header->bars[i]; + struct vpci_bar *bar = &header->bars[i]; unsigned long start = PFN_DOWN(bar->addr); unsigned long end = PFN_DOWN(bar->addr + bar->size - 1); + bar->mem = NULL; + if ( !MAPPABLE_BAR(bar) || (rom_only ? bar->type != VPCI_BAR_ROM : (bar->type == VPCI_BAR_ROM && !header->rom_enabled)) ) continue; - rc = rangeset_add_range(mem, start, end); + bar->mem = rangeset_new(NULL, NULL, 0); + if ( !bar->mem ) + { + rc = -ENOMEM; + goto fail; + } + + rc = rangeset_add_range(bar->mem, start, end); if ( rc ) { printk(XENLOG_G_WARNING "Failed to add [%lx, %lx]: %d\n", start, end, rc); - rangeset_destroy(mem); - return rc; + goto fail; } } @@ -252,14 +283,21 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) unsigned long end = PFN_DOWN(vmsix_table_addr(pdev->vpci, i) + vmsix_table_size(pdev->vpci, i) - 1); - rc = rangeset_remove_range(mem, start, end); - if ( rc ) + for ( j = 0; j < ARRAY_SIZE(header->bars); j++ ) { - printk(XENLOG_G_WARNING - "Failed to remove MSIX table [%lx, %lx]: %d\n", - start, end, rc); - rangeset_destroy(mem); - return rc; + const struct vpci_bar *bar = &header->bars[j]; + + if ( !bar->mem ) + continue; + + rc = rangeset_remove_range(bar->mem, start, end); + if ( rc ) + { + printk(XENLOG_G_WARNING + "Failed to remove MSIX table [%lx, %lx]: %d\n", + start, end, rc); + goto fail; + } } } @@ -291,7 +329,8 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) unsigned long start = PFN_DOWN(bar->addr); unsigned long end = PFN_DOWN(bar->addr + bar->size - 1); - if ( !bar->enabled || !rangeset_overlaps_range(mem, start, end) || + if ( !bar->enabled || + !rangeset_overlaps_range(bar->mem, start, end) || /* * If only the ROM enable bit is toggled check against other * BARs in the same device for overlaps, but not against the @@ -300,13 +339,12 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) (rom_only && tmp == pdev && bar->type == VPCI_BAR_ROM) ) continue; - rc = rangeset_remove_range(mem, start, end); + rc = rangeset_remove_range(bar->mem, start, end); if ( rc ) { printk(XENLOG_G_WARNING "Failed to remove [%lx, %lx]: %d\n", start, end, rc); - rangeset_destroy(mem); - return rc; + goto fail; } } } @@ -324,12 +362,42 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only) * will always be to establish mappings and process all the BARs. */ ASSERT((cmd & PCI_COMMAND_MEMORY) && !rom_only); - return apply_map(pdev->domain, pdev, mem, cmd); + return apply_map(pdev->domain, pdev, cmd); } - defer_map(dev->domain, dev, mem, cmd, rom_only); + /* Find out how many memory ranges has left after MSI and overlaps. */ + num_mem_ranges = 0; + for ( i = 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar = &header->bars[i]; + + if ( !rangeset_is_empty(bar->mem) ) + num_mem_ranges++; + } + + /* + * There are cases when PCI device, root port for example, has neither + * memory space nor IO. In this case PCI command register write is + * missed resulting in the underlying PCI device not functional, so: + * - if there are no regions write the command register now + * - if there are regions then defer work and write later on + */ + if ( !num_mem_ranges ) + pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd); + else + defer_map(dev->domain, dev, cmd, rom_only, num_mem_ranges); return 0; + +fail: + for ( i = 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar = &header->bars[i]; + + rangeset_destroy(bar->mem); + bar->mem = NULL; + } + return rc; } static void cmd_write(const struct pci_dev *pdev, unsigned int reg, diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index a0320b22cb36..352e02d0106d 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -80,6 +80,7 @@ struct vpci { /* Guest view of the BAR. */ uint64_t guest_addr; uint64_t size; + struct rangeset *mem; enum { VPCI_BAR_EMPTY, VPCI_BAR_IO, @@ -154,9 +155,9 @@ struct vpci { struct vpci_vcpu { /* Per-vcpu structure to store state while {un}mapping of PCI BARs. */ - struct rangeset *mem; struct pci_dev *pdev; uint16_t cmd; + uint8_t num_mem_ranges; bool rom_only : 1; };