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Thu, 04 Nov 2021 23:56:33 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 01/11] vpci: fix function attributes for vpci_process_pending Date: Fri, 5 Nov 2021 08:56:19 +0200 Message-Id: <20211105065629.940943-2-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095425921100004 From: Oleksandr Andrushchenko vpci_process_pending is defined with different attributes, e.g. with __must_check if CONFIG_HAS_VPCI enabled and not otherwise. Fix this by defining both of the definitions with __must_check. Fixes: 14583a590783 ("7fbb096bf345 kconfig: don't select VPCI if building a= shim-only binary") Signed-off-by: Oleksandr Andrushchenko --- Cc: Roger Pau Monn=C3=A9 New in v4 --- xen/include/xen/vpci.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 9ea66e033f11..3f32de9d7eb3 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -247,7 +247,7 @@ static inline void vpci_write(pci_sbdf_t sbdf, unsigned= int reg, ASSERT_UNREACHABLE(); } =20 -static inline bool vpci_process_pending(struct vcpu *v) +static inline bool __must_check vpci_process_pending(struct vcpu *v) { ASSERT_UNREACHABLE(); return false; --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; 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Thu, 04 Nov 2021 23:56:34 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 02/11] vpci: cancel pending map/unmap on vpci removal Date: Fri, 5 Nov 2021 08:56:20 +0200 Message-Id: <20211105065629.940943-3-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095424364100001 From: Oleksandr Andrushchenko When a vPCI is removed for a PCI device it is possible that we have scheduled a delayed work for map/unmap operations for that device. For example, the following scenario can illustrate the problem: pci_physdev_op pci_add_device init_bars -> modify_bars -> defer_map -> raise_softirq(SCHEDULE_SOFT= IRQ) iommu_add_device <- FAILS vpci_remove_device -> xfree(pdev->vpci) leave_hypervisor_to_guest vpci_process_pending: v->vpci.mem !=3D NULL; v->vpci.pdev->vpci =3D=3D N= ULL For the hardware domain we continue execution as the worse that could happen is that MMIO mappings are left in place when the device has been deassigned For unprivileged domains that get a failure in the middle of a vPCI {un}map operation we need to destroy them, as we don't know in which state the p2m is. This can only happen in vpci_process_pending for DomUs as they won't be allowed to call pci_add_device. Signed-off-by: Oleksandr Andrushchenko --- Cc: Roger Pau Monn=C3=A9 New in v4 --- xen/drivers/vpci/header.c | 15 +++++++++++++-- xen/drivers/vpci/vpci.c | 2 ++ xen/include/xen/vpci.h | 6 ++++++ 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 40ff79c33f8f..ef538386e95d 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -149,8 +149,7 @@ bool vpci_process_pending(struct vcpu *v) !rc && v->vpci.rom_only); spin_unlock(&v->vpci.pdev->vpci->lock); =20 - rangeset_destroy(v->vpci.mem); - v->vpci.mem =3D NULL; + vpci_cancel_pending(v->vpci.pdev); if ( rc ) /* * FIXME: in case of failure remove the device from the domain. @@ -165,6 +164,18 @@ bool vpci_process_pending(struct vcpu *v) return false; } =20 +void vpci_cancel_pending(const struct pci_dev *pdev) +{ + struct vcpu *v =3D current; + + /* Cancel any pending work now. */ + if ( v->vpci.mem && v->vpci.pdev =3D=3D pdev) + { + rangeset_destroy(v->vpci.mem); + v->vpci.mem =3D NULL; + } +} + static int __init apply_map(struct domain *d, const struct pci_dev *pdev, struct rangeset *mem, uint16_t cmd) { diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 657697fe3406..4e24956419aa 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -51,6 +51,8 @@ void vpci_remove_device(struct pci_dev *pdev) xfree(r); } spin_unlock(&pdev->vpci->lock); + + vpci_cancel_pending(pdev); xfree(pdev->vpci->msix); xfree(pdev->vpci->msi); xfree(pdev->vpci); diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 3f32de9d7eb3..609d6383b252 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -56,6 +56,7 @@ uint32_t vpci_hw_read32(const struct pci_dev *pdev, unsig= ned int reg, * should not run. */ bool __must_check vpci_process_pending(struct vcpu *v); +void vpci_cancel_pending(const struct pci_dev *pdev); =20 struct vpci { /* List of vPCI handlers for a device. */ @@ -252,6 +253,11 @@ static inline bool __must_check vpci_process_pending(s= truct vcpu *v) ASSERT_UNREACHABLE(); return false; } + +static inline void vpci_cancel_pending(const struct pci_dev *pdev) +{ + ASSERT_UNREACHABLE(); +} #endif =20 #endif --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1636095423; cv=none; d=zohomail.com; s=zohoarc; b=ZtDh+Fiu30Oq+OyxPwxhy4b/+M7DZH5HjnX+7OciYtNdrSWfchzca1M5I6cGpWc58xllbQ2+EUOv/roby5j93ya3iL9y9pHEfo6dc4e7aJHjJu3TcU83/6e5AOxrz3Uc7X2qKbrPHk0aoPAvQDmyXWENu/DUhFq0M3E9232RnXA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; 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charset="utf-8" From: Oleksandr Andrushchenko This is in preparation for dynamic assignment of the vpci register handlers depending on the domain: hwdom or guest. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - remove all R-b's due to changes - s/vpci_remove_device_registers/vpci_remove_device_handlers - minor comment cleanup Since v1: - constify struct pci_dev where possible --- xen/drivers/vpci/vpci.c | 6 +++++- xen/include/xen/vpci.h | 2 ++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 4e24956419aa..d7f033a0811f 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -35,7 +35,7 @@ extern vpci_register_init_t *const __start_vpci_array[]; extern vpci_register_init_t *const __end_vpci_array[]; #define NUM_VPCI_INIT (__end_vpci_array - __start_vpci_array) =20 -void vpci_remove_device(struct pci_dev *pdev) +void vpci_remove_device_handlers(const struct pci_dev *pdev) { if ( !has_vpci(pdev->domain) ) return; @@ -51,8 +51,12 @@ void vpci_remove_device(struct pci_dev *pdev) xfree(r); } spin_unlock(&pdev->vpci->lock); +} =20 +void vpci_remove_device(struct pci_dev *pdev) +{ vpci_cancel_pending(pdev); + vpci_remove_device_handlers(pdev); xfree(pdev->vpci->msix); xfree(pdev->vpci->msi); xfree(pdev->vpci); diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 609d6383b252..1883b9d08a70 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -30,6 +30,8 @@ int __must_check vpci_add_handlers(struct pci_dev *dev); =20 /* Remove all handlers and free vpci related structures. */ void vpci_remove_device(struct pci_dev *pdev); +/* Remove all handlers for the device. */ +void vpci_remove_device_handlers(const struct pci_dev *pdev); =20 /* Add/remove a register handler. */ int __must_check vpci_add_register(struct vpci *vpci, --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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Thu, 04 Nov 2021 23:56:37 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 04/11] vpci: add hooks for PCI device assign/de-assign Date: Fri, 5 Nov 2021 08:56:22 +0200 Message-Id: <20211105065629.940943-5-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095425954100006 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko When a PCI device gets assigned/de-assigned some work on vPCI side needs to be done for that device. Introduce a pair of hooks so vPCI can handle that. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - remove toolstack roll-back description from the commit message as error are to be handled with proper cleanup in Xen itself - remove __must_check - remove redundant rc check while assigning devices - fix redundant CONFIG_HAS_VPCI check for CONFIG_HAS_VPCI_GUEST_SUPPORT - use REGISTER_VPCI_INIT machinery to run required steps on device init/assign: add run_vpci_init helper Since v2: - define CONFIG_HAS_VPCI_GUEST_SUPPORT so dead code is not compiled for x86 Since v1: - constify struct pci_dev where possible - do not open code is_system_domain() - extended the commit message --- xen/drivers/Kconfig | 4 +++ xen/drivers/passthrough/pci.c | 6 ++++ xen/drivers/vpci/vpci.c | 57 ++++++++++++++++++++++++++++++----- xen/include/xen/vpci.h | 16 ++++++++++ 4 files changed, 75 insertions(+), 8 deletions(-) diff --git a/xen/drivers/Kconfig b/xen/drivers/Kconfig index db94393f47a6..780490cf8e39 100644 --- a/xen/drivers/Kconfig +++ b/xen/drivers/Kconfig @@ -15,4 +15,8 @@ source "drivers/video/Kconfig" config HAS_VPCI bool =20 +config HAS_VPCI_GUEST_SUPPORT + bool + depends on HAS_VPCI + endmenu diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index a9d31293ac09..529a4f50aa80 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -873,6 +873,10 @@ static int deassign_device(struct domain *d, uint16_t = seg, uint8_t bus, if ( ret ) goto out; =20 + ret =3D vpci_deassign_device(d, pdev); + if ( ret ) + goto out; + if ( pdev->domain =3D=3D hardware_domain ) pdev->quarantine =3D false; =20 @@ -1445,6 +1449,8 @@ static int assign_device(struct domain *d, u16 seg, u= 8 bus, u8 devfn, u32 flag) rc =3D hd->platform_ops->assign_device(d, devfn, pci_to_dev(pdev),= flag); } =20 + rc =3D vpci_assign_device(d, pdev); + done: if ( rc ) printk(XENLOG_G_WARNING "%pd: assign (%pp) failed (%d)\n", diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index d7f033a0811f..5f086398a98c 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -63,11 +63,25 @@ void vpci_remove_device(struct pci_dev *pdev) pdev->vpci =3D NULL; } =20 -int vpci_add_handlers(struct pci_dev *pdev) +static int run_vpci_init(struct pci_dev *pdev) { unsigned int i; int rc =3D 0; =20 + for ( i =3D 0; i < NUM_VPCI_INIT; i++ ) + { + rc =3D __start_vpci_array[i](pdev); + if ( rc ) + break; + } + + return rc; +} + +int vpci_add_handlers(struct pci_dev *pdev) +{ + int rc; + if ( !has_vpci(pdev->domain) ) return 0; =20 @@ -81,18 +95,45 @@ int vpci_add_handlers(struct pci_dev *pdev) INIT_LIST_HEAD(&pdev->vpci->handlers); spin_lock_init(&pdev->vpci->lock); =20 - for ( i =3D 0; i < NUM_VPCI_INIT; i++ ) - { - rc =3D __start_vpci_array[i](pdev); - if ( rc ) - break; - } - + rc =3D run_vpci_init(pdev); if ( rc ) vpci_remove_device(pdev); =20 return rc; } + +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +/* Notify vPCI that device is assigned to guest. */ +int vpci_assign_device(struct domain *d, struct pci_dev *pdev) +{ + int rc; + + /* It only makes sense to assign for hwdom or guest domain. */ + if ( is_system_domain(d) || !has_vpci(d) ) + return 0; + + vpci_remove_device_handlers(pdev); + + rc =3D run_vpci_init(pdev); + if ( rc ) + vpci_deassign_device(d, pdev); + + return rc; +} + +/* Notify vPCI that device is de-assigned from guest. */ +int vpci_deassign_device(struct domain *d, struct pci_dev *pdev) +{ + /* It only makes sense to de-assign from hwdom or guest domain. */ + if ( is_system_domain(d) || !has_vpci(d) ) + return 0; + + vpci_remove_device_handlers(pdev); + + return 0; +} +#endif /* CONFIG_HAS_VPCI_GUEST_SUPPORT */ + #endif /* __XEN__ */ =20 static int vpci_register_cmp(const struct vpci_register *r1, diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 1883b9d08a70..a016b4197801 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -262,6 +262,22 @@ static inline void vpci_cancel_pending(const struct pc= i_dev *pdev) } #endif =20 +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +/* Notify vPCI that device is assigned/de-assigned to/from guest. */ +int vpci_assign_device(struct domain *d, struct pci_dev *pdev); +int vpci_deassign_device(struct domain *d, struct pci_dev *pdev); +#else +static inline int vpci_assign_device(struct domain *d, struct pci_dev *pde= v) +{ + return 0; +}; + +static inline int vpci_deassign_device(struct domain *d, struct pci_dev *p= dev) +{ + return 0; +}; +#endif + #endif =20 /* --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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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Thu, 04 Nov 2021 23:56:38 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 05/11] vpci/header: implement guest BAR register handlers Date: Fri, 5 Nov 2021 08:56:23 +0200 Message-Id: <20211105065629.940943-6-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095425976100009 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko Add relevant vpci register handlers when assigning PCI device to a domain and remove those when de-assigning. This allows having different handlers for different domains, e.g. hwdom and other guests. Emulate guest BAR register values: this allows creating a guest view of the registers and emulates size and properties probe as it is done during PCI device enumeration by the guest. ROM BAR is only handled for the hardware domain and for guest domains there is a stub: at the moment PCI expansion ROM is x86 only, so it might not be used by other architectures without emulating x86. Other use-cases may include using that expansion ROM before Xen boots, hence no emulation is needed in Xen itself. Or when a guest wants to use the ROM code which seems to be rare. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - squashed two patches: dynamic add/remove handlers and guest BAR handler implementation - fix guest BAR read of the high part of a 64bit BAR (Roger) - add error handling to vpci_assign_device - s/dom%pd/%pd - blank line before return Since v2: - remove unneeded ifdefs for CONFIG_HAS_VPCI_GUEST_SUPPORT as more code has been eliminated from being built on x86 Since v1: - constify struct pci_dev where possible - do not open code is_system_domain() - simplify some code3. simplify - use gdprintk + error code instead of gprintk - gate vpci_bar_{add|remove}_handlers with CONFIG_HAS_VPCI_GUEST_SUPPORT, so these do not get compiled for x86 - removed unneeded is_system_domain check - re-work guest read/write to be much simpler and do more work on write than read which is expected to be called more frequently - removed one too obvious comment --- xen/drivers/vpci/header.c | 72 +++++++++++++++++++++++++++++++++++---- xen/include/xen/vpci.h | 3 ++ 2 files changed, 69 insertions(+), 6 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index ef538386e95d..1239051ee8ff 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -408,6 +408,48 @@ static void bar_write(const struct pci_dev *pdev, unsi= gned int reg, pci_conf_write32(pdev->sbdf, reg, val); } =20 +static void guest_bar_write(const struct pci_dev *pdev, unsigned int reg, + uint32_t val, void *data) +{ + struct vpci_bar *bar =3D data; + bool hi =3D false; + + if ( bar->type =3D=3D VPCI_BAR_MEM64_HI ) + { + ASSERT(reg > PCI_BASE_ADDRESS_0); + bar--; + hi =3D true; + } + else + { + val &=3D PCI_BASE_ADDRESS_MEM_MASK; + val |=3D bar->type =3D=3D VPCI_BAR_MEM32 ? PCI_BASE_ADDRESS_MEM_TY= PE_32 + : PCI_BASE_ADDRESS_MEM_TYPE_64; + val |=3D bar->prefetchable ? PCI_BASE_ADDRESS_MEM_PREFETCH : 0; + } + + bar->guest_addr &=3D ~(0xffffffffull << (hi ? 32 : 0)); + bar->guest_addr |=3D (uint64_t)val << (hi ? 32 : 0); + + bar->guest_addr &=3D ~(bar->size - 1) | ~PCI_BASE_ADDRESS_MEM_MASK; +} + +static uint32_t guest_bar_read(const struct pci_dev *pdev, unsigned int re= g, + void *data) +{ + const struct vpci_bar *bar =3D data; + bool hi =3D false; + + if ( bar->type =3D=3D VPCI_BAR_MEM64_HI ) + { + ASSERT(reg > PCI_BASE_ADDRESS_0); + bar--; + hi =3D true; + } + + return bar->guest_addr >> (hi ? 32 : 0); +} + static void rom_write(const struct pci_dev *pdev, unsigned int reg, uint32_t val, void *data) { @@ -456,6 +498,17 @@ static void rom_write(const struct pci_dev *pdev, unsi= gned int reg, rom->addr =3D val & PCI_ROM_ADDRESS_MASK; } =20 +static void guest_rom_write(const struct pci_dev *pdev, unsigned int reg, + uint32_t val, void *data) +{ +} + +static uint32_t guest_rom_read(const struct pci_dev *pdev, unsigned int re= g, + void *data) +{ + return 0xffffffff; +} + static int init_bars(struct pci_dev *pdev) { uint16_t cmd; @@ -464,6 +517,7 @@ static int init_bars(struct pci_dev *pdev) struct vpci_header *header =3D &pdev->vpci->header; struct vpci_bar *bars =3D header->bars; int rc; + bool is_hwdom =3D is_hardware_domain(pdev->domain); =20 switch ( pci_conf_read8(pdev->sbdf, PCI_HEADER_TYPE) & 0x7f ) { @@ -503,8 +557,10 @@ static int init_bars(struct pci_dev *pdev) if ( i && bars[i - 1].type =3D=3D VPCI_BAR_MEM64_LO ) { bars[i].type =3D VPCI_BAR_MEM64_HI; - rc =3D vpci_add_register(pdev->vpci, vpci_hw_read32, bar_write= , reg, - 4, &bars[i]); + rc =3D vpci_add_register(pdev->vpci, + is_hwdom ? vpci_hw_read32 : guest_bar_r= ead, + is_hwdom ? bar_write : guest_bar_write, + reg, 4, &bars[i]); if ( rc ) { pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd); @@ -544,8 +600,10 @@ static int init_bars(struct pci_dev *pdev) bars[i].size =3D size; bars[i].prefetchable =3D val & PCI_BASE_ADDRESS_MEM_PREFETCH; =20 - rc =3D vpci_add_register(pdev->vpci, vpci_hw_read32, bar_write, re= g, 4, - &bars[i]); + rc =3D vpci_add_register(pdev->vpci, + is_hwdom ? vpci_hw_read32 : guest_bar_read, + is_hwdom ? bar_write : guest_bar_write, + reg, 4, &bars[i]); if ( rc ) { pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd); @@ -565,8 +623,10 @@ static int init_bars(struct pci_dev *pdev) header->rom_enabled =3D pci_conf_read32(pdev->sbdf, rom_reg) & PCI_ROM_ADDRESS_ENABLE; =20 - rc =3D vpci_add_register(pdev->vpci, vpci_hw_read32, rom_write, ro= m_reg, - 4, rom); + rc =3D vpci_add_register(pdev->vpci, + is_hwdom ? vpci_hw_read32 : guest_rom_read, + is_hwdom ? rom_write : guest_rom_write, + rom_reg, 4, rom); if ( rc ) rom->type =3D VPCI_BAR_EMPTY; } diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index a016b4197801..3e7428da822c 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -70,7 +70,10 @@ struct vpci { struct vpci_header { /* Information about the PCI BARs of this device. */ struct vpci_bar { + /* Physical view of the BAR. */ uint64_t addr; + /* Guest view of the BAR. */ + uint64_t guest_addr; 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Thu, 04 Nov 2021 23:56:39 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 06/11] vpci/header: handle p2m range sets per BAR Date: Fri, 5 Nov 2021 08:56:24 +0200 Message-Id: <20211105065629.940943-7-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095428036100013 Content-Type: text/plain; charset="utf-8" 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 --- Since v3: - re-work vpci_cancel_pending accordingly to the per-BAR handling - s/num_mem_ranges/map_pending and s/uint8_t/bool - ASSERT(bar->mem) in modify_bars - create and destroy the rangesets on add/remove --- xen/drivers/vpci/header.c | 178 ++++++++++++++++++++++++++------------ xen/drivers/vpci/vpci.c | 26 +++++- xen/include/xen/vpci.h | 3 +- 3 files changed, 150 insertions(+), 57 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 1239051ee8ff..5fc2dfbbc864 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -131,34 +131,50 @@ static void modify_decoding(const struct pci_dev *pde= v, uint16_t cmd, =20 bool vpci_process_pending(struct vcpu *v) { - if ( v->vpci.mem ) + if ( v->vpci.map_pending ) { struct map_data data =3D { .d =3D v->domain, .map =3D v->vpci.cmd & PCI_COMMAND_MEMORY, }; - int rc =3D rangeset_consume_ranges(v->vpci.mem, map_range, &data); + struct pci_dev *pdev =3D v->vpci.pdev; + struct vpci_header *header =3D &pdev->vpci->header; + unsigned int i; =20 - if ( rc =3D=3D -ERESTART ) - return true; + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar =3D &header->bars[i]; + int rc; =20 - 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.c= md, - !rc && v->vpci.rom_only); - spin_unlock(&v->vpci.pdev->vpci->lock); + if ( rangeset_is_empty(bar->mem) ) + continue; =20 - vpci_cancel_pending(v->vpci.pdev); - if ( rc ) - /* - * FIXME: in case of failure remove the device from the domain. - * Note that there might still be leftover mappings. While thi= s 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 =3D rangeset_consume_ranges(bar->mem, map_range, &data); + + if ( rc =3D=3D -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->vp= ci.cmd, + !rc && v->vpci.rom_only); + spin_unlock(&pdev->vpci->lock); + + if ( rc ) + { + /* + * FIXME: in case of failure remove the device from the do= main. + * 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); + break; + } + } + v->vpci.map_pending =3D false; } =20 return false; @@ -169,22 +185,48 @@ void vpci_cancel_pending(const struct pci_dev *pdev) struct vcpu *v =3D current; =20 /* Cancel any pending work now. */ - if ( v->vpci.mem && v->vpci.pdev =3D=3D pdev) + if ( v->vpci.map_pending && v->vpci.pdev =3D=3D pdev) { - rangeset_destroy(v->vpci.mem); - v->vpci.mem =3D NULL; + struct vpci_header *header =3D &pdev->vpci->header; + unsigned int i; + int rc; + + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar =3D &header->bars[i]; + + if ( rangeset_is_empty(bar->mem) ) + continue; + + rc =3D rangeset_remove_range(bar->mem, 0, ~0ULL); + if ( !rc ) + printk(XENLOG_ERR + "%pd %pp failed to remove range set for BAR: %d\n", + v->domain, &pdev->sbdf, rc); + } + v->vpci.map_pending =3D false; } } =20 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 =3D { .d =3D d, .map =3D true }; - int rc; + struct vpci_header *header =3D &pdev->vpci->header; + int rc =3D 0; + unsigned int i; + + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar =3D &header->bars[i]; + + if ( rangeset_is_empty(bar->mem) ) + continue; =20 - while ( (rc =3D rangeset_consume_ranges(mem, map_range, &data)) =3D=3D= -ERESTART ) - process_pending_softirqs(); - rangeset_destroy(mem); + while ( (rc =3D rangeset_consume_ranges(bar->mem, map_range, + &data)) =3D=3D -ERESTART ) + process_pending_softirqs(); + } if ( !rc ) modify_decoding(pdev, cmd, false); =20 @@ -192,7 +234,7 @@ static int __init apply_map(struct domain *d, const str= uct pci_dev *pdev, } =20 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) { struct vcpu *curr =3D current; =20 @@ -203,9 +245,9 @@ 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 =3D pdev; - curr->vpci.mem =3D mem; curr->vpci.cmd =3D cmd; curr->vpci.rom_only =3D rom_only; + curr->vpci.map_pending =3D true; /* * Raise a scheduler softirq in order to prevent the guest from resumi= ng * execution with pending mapping operations, to trigger the invocation @@ -217,42 +259,40 @@ static void defer_map(struct domain *d, struct pci_de= v *pdev, static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_= only) { struct vpci_header *header =3D &pdev->vpci->header; - struct rangeset *mem =3D rangeset_new(NULL, NULL, 0); struct pci_dev *tmp, *dev =3D NULL; const struct vpci_msix *msix =3D pdev->vpci->msix; - unsigned int i; + unsigned int i, j; int rc; - - if ( !mem ) - return -ENOMEM; + bool map_pending; =20 /* - * Create a rangeset that represents the current device BARs memory re= gion + * 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/unmap= ped. * - * First fill the rangeset with all the BARs of this device or with th= e ROM + * First fill the rangesets with all the BARs of this device or with t= he ROM * BAR only, depending on whether the guest is toggling the memory dec= ode * bit of the command register, or the enable bit of the ROM BAR regis= ter. */ for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) { - const struct vpci_bar *bar =3D &header->bars[i]; + struct vpci_bar *bar =3D &header->bars[i]; unsigned long start =3D PFN_DOWN(bar->addr); unsigned long end =3D PFN_DOWN(bar->addr + bar->size - 1); =20 + ASSERT(bar->mem); + if ( !MAPPABLE_BAR(bar) || (rom_only ? bar->type !=3D VPCI_BAR_ROM : (bar->type =3D=3D VPCI_BAR_ROM && !header->rom_en= abled)) ) continue; =20 - rc =3D rangeset_add_range(mem, start, end); + rc =3D 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; } } =20 @@ -263,14 +303,21 @@ static int modify_bars(const struct pci_dev *pdev, ui= nt16_t cmd, bool rom_only) unsigned long end =3D PFN_DOWN(vmsix_table_addr(pdev->vpci, i) + vmsix_table_size(pdev->vpci, i) - 1); =20 - rc =3D rangeset_remove_range(mem, start, end); - if ( rc ) + for ( j =3D 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 =3D &header->bars[j]; + + if ( rangeset_is_empty(bar->mem) ) + continue; + + rc =3D 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; + } } } =20 @@ -302,7 +349,8 @@ static int modify_bars(const struct pci_dev *pdev, uint= 16_t cmd, bool rom_only) unsigned long start =3D PFN_DOWN(bar->addr); unsigned long end =3D PFN_DOWN(bar->addr + bar->size - 1); =20 - 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 ot= her * BARs in the same device for overlaps, but not against = the @@ -311,13 +359,12 @@ static int modify_bars(const struct pci_dev *pdev, ui= nt16_t cmd, bool rom_only) (rom_only && tmp =3D=3D pdev && bar->type =3D=3D VPCI_BAR= _ROM) ) continue; =20 - rc =3D rangeset_remove_range(mem, start, end); + rc =3D 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; } } } @@ -335,12 +382,35 @@ static int modify_bars(const struct pci_dev *pdev, ui= nt16_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); } =20 - defer_map(dev->domain, dev, mem, cmd, rom_only); + /* Find out how many memory ranges has left after MSI and overlaps. */ + map_pending =3D false; + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + if ( !rangeset_is_empty(header->bars[i].mem) ) + { + map_pending =3D true; + break; + } + + /* + * 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 ( !map_pending ) + pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd); + else + defer_map(dev->domain, dev, cmd, rom_only); =20 return 0; + +fail: + vpci_cancel_pending(pdev); + return rc; } =20 static void cmd_write(const struct pci_dev *pdev, unsigned int reg, diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 5f086398a98c..45733300f00b 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -55,7 +55,12 @@ void vpci_remove_device_handlers(const struct pci_dev *p= dev) =20 void vpci_remove_device(struct pci_dev *pdev) { + struct vpci_header *header =3D &pdev->vpci->header; + unsigned int i; + vpci_cancel_pending(pdev); + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + rangeset_destroy(header->bars[i].mem); vpci_remove_device_handlers(pdev); xfree(pdev->vpci->msix); xfree(pdev->vpci->msi); @@ -80,6 +85,8 @@ static int run_vpci_init(struct pci_dev *pdev) =20 int vpci_add_handlers(struct pci_dev *pdev) { + struct vpci_header *header; + unsigned int i; int rc; =20 if ( !has_vpci(pdev->domain) ) @@ -95,10 +102,25 @@ int vpci_add_handlers(struct pci_dev *pdev) INIT_LIST_HEAD(&pdev->vpci->handlers); spin_lock_init(&pdev->vpci->lock); =20 + header =3D &pdev->vpci->header; + for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) + { + struct vpci_bar *bar =3D &header->bars[i]; + + bar->mem =3D rangeset_new(NULL, NULL, 0); + if ( !bar->mem ) + { + rc =3D -ENOMEM; + goto fail; + } + } + rc =3D run_vpci_init(pdev); - if ( rc ) - vpci_remove_device(pdev); + if ( !rc ) + return 0; =20 + fail: + vpci_remove_device(pdev); return rc; } =20 diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 3e7428da822c..143f3166a730 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -75,6 +75,7 @@ struct vpci { /* Guest view of the BAR. */ uint64_t guest_addr; uint64_t size; + struct rangeset *mem; enum { VPCI_BAR_EMPTY, VPCI_BAR_IO, @@ -149,9 +150,9 @@ struct vpci { =20 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; + bool map_pending : 1; bool rom_only : 1; }; =20 --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1636095426; cv=none; d=zohomail.com; s=zohoarc; b=dm66DFU1sFKZK1MIgl1HiZCRmlxxdbDXF+uWLfK+Suyv+ca3DO8dnyB8Wg9HzcAJDZb3wgQyYyJNmOFtvTZyyjQKQiAo3GLC/oFcVzu74RShfkGckw7IwSKSnTo2KZxFiO+ortPdI08OvNxz4i1Egi/6s+Kx5PRaLuSFez0B1O0= ARC-Message-Signature: i=1; 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charset="utf-8" From: Oleksandr Andrushchenko Take into account guest's BAR view and program its p2m accordingly: gfn is guest's view of the BAR and mfn is the physical BAR value as set up by the host bridge in the hardware domain. This way hardware doamin sees physical BAR values and guest sees emulated ones. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - updated comment (Roger) - removed gfn_add(map->start_gfn, rc); which is wrong - use v->domain instead of v->vpci.pdev->domain - removed odd e.g. in comment - s/d%d/%pd in altered code - use gdprintk for map/unmap logs Since v2: - improve readability for data.start_gfn and restructure ?: construct Since v1: - s/MSI/MSI-X in comments --- xen/drivers/vpci/header.c | 33 +++++++++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 4 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 5fc2dfbbc864..34158da2d5f6 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -30,6 +30,10 @@ =20 struct map_data { struct domain *d; + /* Start address of the BAR as seen by the guest. */ + gfn_t start_gfn; + /* Physical start address of the BAR. */ + mfn_t start_mfn; bool map; }; =20 @@ -37,12 +41,24 @@ static int map_range(unsigned long s, unsigned long e, = void *data, unsigned long *c) { const struct map_data *map =3D data; + gfn_t start_gfn; int rc; =20 for ( ; ; ) { unsigned long size =3D e - s + 1; =20 + /* + * Ranges to be mapped don't always start at the BAR start address= , as + * there can be holes or partially consumed ranges. Account for the + * offset of the current address from the BAR start. + */ + start_gfn =3D gfn_add(map->start_gfn, s - mfn_x(map->start_mfn)); + + gdprintk(XENLOG_G_DEBUG, + "%smap [%lx, %lx] -> %#"PRI_gfn" for %pd\n", + map->map ? "" : "un", s, e, gfn_x(start_gfn), + map->d); /* * ARM TODOs: * - On ARM whether the memory is prefetchable or not should be pa= ssed @@ -52,8 +68,10 @@ static int map_range(unsigned long s, unsigned long e, v= oid *data, * - {un}map_mmio_regions doesn't support preemption. */ =20 - rc =3D map->map ? map_mmio_regions(map->d, _gfn(s), size, _mfn(s)) - : unmap_mmio_regions(map->d, _gfn(s), size, _mfn(s)); + rc =3D map->map ? map_mmio_regions(map->d, start_gfn, + size, _mfn(s)) + : unmap_mmio_regions(map->d, start_gfn, + size, _mfn(s)); if ( rc =3D=3D 0 ) { *c +=3D size; @@ -62,8 +80,8 @@ static int map_range(unsigned long s, unsigned long e, vo= id *data, if ( rc < 0 ) { printk(XENLOG_G_WARNING - "Failed to identity %smap [%lx, %lx] for d%d: %d\n", - map->map ? "" : "un", s, e, map->d->domain_id, rc); + "Failed to identity %smap [%lx, %lx] for %pd: %d\n", + map->map ? "" : "un", s, e, map->d, rc); break; } ASSERT(rc < size); @@ -149,6 +167,10 @@ bool vpci_process_pending(struct vcpu *v) if ( rangeset_is_empty(bar->mem) ) continue; =20 + data.start_gfn =3D + _gfn(PFN_DOWN(is_hardware_domain(v->domain) + ? bar->addr : bar->guest_addr)); + data.start_mfn =3D _mfn(PFN_DOWN(bar->addr)); rc =3D rangeset_consume_ranges(bar->mem, map_range, &data); =20 if ( rc =3D=3D -ERESTART ) @@ -223,6 +245,9 @@ static int __init apply_map(struct domain *d, const str= uct pci_dev *pdev, if ( rangeset_is_empty(bar->mem) ) continue; =20 + data.start_gfn =3D _gfn(PFN_DOWN(is_hardware_domain(d) + ? bar->addr : bar->guest_addr)); + data.start_mfn =3D _mfn(PFN_DOWN(bar->addr)); while ( (rc =3D rangeset_consume_ranges(bar->mem, map_range, &data)) =3D=3D -ERESTART ) process_pending_softirqs(); --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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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Thu, 04 Nov 2021 23:56:41 -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, andrew.cooper3@citrix.com, george.dunlap@citrix.com, paul@xen.org, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v4 08/11] vpci/header: emulate PCI_COMMAND register for guests Date: Fri, 5 Nov 2021 08:56:26 +0200 Message-Id: <20211105065629.940943-9-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211105065629.940943-1-andr2000@gmail.com> References: <20211105065629.940943-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1636095428107100014 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko Add basic emulation support for guests. At the moment only emulate PCI_COMMAND_INTX_DISABLE bit, the rest is not emulated yet and left as TODO. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - gate more code on CONFIG_HAS_MSI - removed logic for the case when MSI/MSI-X not enabled --- xen/drivers/vpci/header.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 34158da2d5f6..64cfc268c341 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -459,6 +459,22 @@ static void cmd_write(const struct pci_dev *pdev, unsi= gned int reg, pci_conf_write16(pdev->sbdf, reg, cmd); } =20 +static void guest_cmd_write(const struct pci_dev *pdev, unsigned int reg, + uint32_t cmd, void *data) +{ + /* TODO: Add proper emulation for all bits of the command register. */ + +#ifdef CONFIG_HAS_PCI_MSI + if ( pdev->vpci->msi->enabled ) + { + /* Guest wants to enable INTx. It can't be enabled if MSI/MSI-X en= abled. */ + cmd |=3D PCI_COMMAND_INTX_DISABLE; + } +#endif + + cmd_write(pdev, reg, cmd, data); +} + static void bar_write(const struct pci_dev *pdev, unsigned int reg, uint32_t val, void *data) { @@ -631,8 +647,9 @@ static int init_bars(struct pci_dev *pdev) } =20 /* Setup a handler for the command register. */ - rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, cmd_write, PCI_CO= MMAND, - 2, header); + rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, + is_hwdom ? cmd_write : guest_cmd_write, + PCI_COMMAND, 2, header); if ( rc ) return rc; =20 --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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; 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charset="utf-8" From: Oleksandr Andrushchenko Reset the command register when passing through a PCI device: it is possible that when passing through a PCI device its memory decoding bits in the command register are already set. Thus, a guest OS may not write to the command register to update memory decoding, so guest mappings (guest's view of the BARs) are left not updated. Signed-off-by: Oleksandr Andrushchenko --- Since v1: - do not write 0 to the command register, but respect host settings. --- xen/drivers/vpci/header.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 64cfc268c341..680319b3a63f 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -459,8 +459,7 @@ static void cmd_write(const struct pci_dev *pdev, unsig= ned int reg, pci_conf_write16(pdev->sbdf, reg, cmd); } =20 -static void guest_cmd_write(const struct pci_dev *pdev, unsigned int reg, - uint32_t cmd, void *data) +static uint32_t emulate_cmd_reg(const struct pci_dev *pdev, uint32_t cmd) { /* TODO: Add proper emulation for all bits of the command register. */ =20 @@ -472,7 +471,13 @@ static void guest_cmd_write(const struct pci_dev *pdev= , unsigned int reg, } #endif =20 - cmd_write(pdev, reg, cmd, data); + return cmd; +} + +static void guest_cmd_write(const struct pci_dev *pdev, unsigned int reg, + uint32_t cmd, void *data) +{ + cmd_write(pdev, reg, emulate_cmd_reg(pdev, cmd), data); } =20 static void bar_write(const struct pci_dev *pdev, unsigned int reg, @@ -646,6 +651,10 @@ static int init_bars(struct pci_dev *pdev) return -EOPNOTSUPP; } =20 + /* Reset the command register for the guest. */ + if ( !is_hwdom ) + pci_conf_write16(pdev->sbdf, PCI_COMMAND, emulate_cmd_reg(pdev, 0)= ); + /* Setup a handler for the command register. */ rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, is_hwdom ? cmd_write : guest_cmd_write, --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; 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charset="utf-8" From: Oleksandr Andrushchenko Assign SBDF to the PCI devices being passed through with bus 0. The resulting topology is where PCIe devices reside on the bus 0 of the root complex itself (embedded endpoints). This implementation is limited to 32 devices which are allowed on a single PCI bus. Please note, that at the moment only function 0 of a multifunction device can be passed through. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - make use of VPCI_INIT - moved all new code to vpci.c which belongs to it - changed open-coded 31 to PCI_SLOT(~0) - revisited locking: add dedicated vdev list's lock - added comments and code to reject multifunction devices with functions other than 0 - updated comment about vpci_dev_next and made it unsigned int - implement roll back in case of error while assigning/deassigning devices - s/dom%pd/%pd Since v2: - remove casts that are (a) malformed and (b) unnecessary - add new line for better readability - remove CONFIG_HAS_VPCI_GUEST_SUPPORT ifdef's as the relevant vPCI functions are now completely gated with this config - gate common code with CONFIG_HAS_VPCI_GUEST_SUPPORT New in v2 --- xen/drivers/vpci/vpci.c | 52 +++++++++++++++++++++++++++++++++++++++++ xen/include/xen/sched.h | 8 +++++++ xen/include/xen/vpci.h | 4 ++++ 3 files changed, 64 insertions(+) diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 45733300f00b..6657d236dc1a 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -101,6 +101,9 @@ int vpci_add_handlers(struct pci_dev *pdev) =20 INIT_LIST_HEAD(&pdev->vpci->handlers); spin_lock_init(&pdev->vpci->lock); +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + pdev->vpci->guest_sbdf.sbdf =3D ~0; +#endif =20 header =3D &pdev->vpci->header; for ( i =3D 0; i < ARRAY_SIZE(header->bars); i++ ) @@ -125,6 +128,54 @@ int vpci_add_handlers(struct pci_dev *pdev) } =20 #ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +int vpci_add_virtual_device(struct pci_dev *pdev) +{ + struct domain *d =3D pdev->domain; + pci_sbdf_t sbdf; + unsigned long new_dev_number; + + /* + * Each PCI bus supports 32 devices/slots at max or up to 256 when + * there are multi-function ones which are not yet supported. + */ + if ( pdev->info.is_extfn ) + { + gdprintk(XENLOG_ERR, "%pp: only function 0 passthrough supported\n= ", + &pdev->sbdf); + return -EOPNOTSUPP; + } + + new_dev_number =3D find_first_zero_bit(&d->vpci_dev_assigned_map, + PCI_SLOT(~0) + 1); + if ( new_dev_number > PCI_SLOT(~0) ) + return -ENOSPC; + + set_bit(new_dev_number, &d->vpci_dev_assigned_map); + + /* + * Both segment and bus number are 0: + * - we emulate a single host bridge for the guest, e.g. segment 0 + * - with bus 0 the virtual devices are seen as embedded + * endpoints behind the root complex + * + * TODO: add support for multi-function devices. + */ + sbdf.sbdf =3D 0; + sbdf.devfn =3D PCI_DEVFN(new_dev_number, 0); + pdev->vpci->guest_sbdf =3D sbdf; + + return 0; + +} +REGISTER_VPCI_INIT(vpci_add_virtual_device, VPCI_PRIORITY_MIDDLE); + +static void vpci_remove_virtual_device(struct domain *d, + const struct pci_dev *pdev) +{ + clear_bit(pdev->vpci->guest_sbdf.dev, &d->vpci_dev_assigned_map); + pdev->vpci->guest_sbdf.sbdf =3D ~0; +} + /* Notify vPCI that device is assigned to guest. */ int vpci_assign_device(struct domain *d, struct pci_dev *pdev) { @@ -150,6 +201,7 @@ int vpci_deassign_device(struct domain *d, struct pci_d= ev *pdev) if ( is_system_domain(d) || !has_vpci(d) ) return 0; =20 + vpci_remove_virtual_device(d, pdev); vpci_remove_device_handlers(pdev); =20 return 0; diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 28146ee404e6..10bff103317c 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -444,6 +444,14 @@ struct domain =20 #ifdef CONFIG_HAS_PCI struct list_head pdev_list; +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* + * The bitmap which shows which device numbers are already used by the + * virtual PCI bus topology and is used to assign a unique SBDF to the + * next passed through virtual PCI device. + */ + unsigned long vpci_dev_assigned_map; +#endif #endif =20 #ifdef CONFIG_HAS_PASSTHROUGH diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 143f3166a730..9cc7071bc0af 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -145,6 +145,10 @@ struct vpci { struct vpci_arch_msix_entry arch; } entries[]; } *msix; +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* Virtual SBDF of the device. */ + pci_sbdf_t guest_sbdf; +#endif #endif }; =20 --=20 2.25.1 From nobody Sun Apr 28 23:07:14 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; dkim=pass; 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; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; 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charset="utf-8" From: Oleksandr Andrushchenko There are three originators for the PCI configuration space access: 1. The domain that owns physical host bridge: MMIO handlers are there so we can update vPCI register handlers with the values written by the hardware domain, e.g. physical view of the registers vs guest's view on the configuration space. 2. Guest access to the passed through PCI devices: we need to properly map virtual bus topology to the physical one, e.g. pass the configuration space access to the corresponding physical devices. 3. Emulated host PCI bridge access. It doesn't exist in the physical topology, e.g. it can't be mapped to some physical host bridge. So, all access to the host bridge itself needs to be trapped and emulated. Signed-off-by: Oleksandr Andrushchenko --- Since v3: - revisit locking - move code to vpci.c Since v2: - pass struct domain instead of struct vcpu - constify arguments where possible - gate relevant code with CONFIG_HAS_VPCI_GUEST_SUPPORT New in v2 --- xen/arch/arm/vpci.c | 18 ++++++++++++++++++ xen/drivers/vpci/vpci.c | 30 ++++++++++++++++++++++++++++++ xen/include/xen/vpci.h | 1 + 3 files changed, 49 insertions(+) diff --git a/xen/arch/arm/vpci.c b/xen/arch/arm/vpci.c index 5a6ebd8b9868..6a37f770f8f0 100644 --- a/xen/arch/arm/vpci.c +++ b/xen/arch/arm/vpci.c @@ -41,6 +41,15 @@ static int vpci_mmio_read(struct vcpu *v, mmio_info_t *i= nfo, /* data is needed to prevent a pointer cast on 32bit */ unsigned long data; =20 +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* + * For the passed through devices we need to map their virtual SBDF + * to the physical PCI device being passed through. + */ + if ( !bridge && !vpci_translate_virtual_device(v->domain, &sbdf) ) + return 1; +#endif + if ( vpci_ecam_read(sbdf, ECAM_REG_OFFSET(info->gpa), 1U << info->dabt.size, &data) ) { @@ -59,6 +68,15 @@ static int vpci_mmio_write(struct vcpu *v, mmio_info_t *= info, struct pci_host_bridge *bridge =3D p; pci_sbdf_t sbdf =3D vpci_sbdf_from_gpa(bridge, info->gpa); =20 +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* + * For the passed through devices we need to map their virtual SBDF + * to the physical PCI device being passed through. + */ + if ( !bridge && !vpci_translate_virtual_device(v->domain, &sbdf) ) + return 1; +#endif + return vpci_ecam_write(sbdf, ECAM_REG_OFFSET(info->gpa), 1U << info->dabt.size, r); } diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 6657d236dc1a..cb0bde35b6a6 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -94,6 +94,7 @@ int vpci_add_handlers(struct pci_dev *pdev) =20 /* We should not get here twice for the same device. */ ASSERT(!pdev->vpci); + ASSERT(pcidevs_locked()); =20 pdev->vpci =3D xzalloc(struct vpci); if ( !pdev->vpci ) @@ -134,6 +135,8 @@ int vpci_add_virtual_device(struct pci_dev *pdev) pci_sbdf_t sbdf; unsigned long new_dev_number; =20 + ASSERT(pcidevs_locked()); + /* * Each PCI bus supports 32 devices/slots at max or up to 256 when * there are multi-function ones which are not yet supported. @@ -172,10 +175,37 @@ REGISTER_VPCI_INIT(vpci_add_virtual_device, VPCI_PRIO= RITY_MIDDLE); static void vpci_remove_virtual_device(struct domain *d, const struct pci_dev *pdev) { + ASSERT(pcidevs_locked()); + clear_bit(pdev->vpci->guest_sbdf.dev, &d->vpci_dev_assigned_map); pdev->vpci->guest_sbdf.sbdf =3D ~0; } =20 +/* + * Find the physical device which is mapped to the virtual device + * and translate virtual SBDF to the physical one. + */ +bool vpci_translate_virtual_device(struct domain *d, pci_sbdf_t *sbdf) +{ + const struct pci_dev *pdev; + bool found =3D false; + + pcidevs_lock(); + for_each_pdev( d, pdev ) + { + if ( pdev->vpci->guest_sbdf.sbdf =3D=3D sbdf->sbdf ) + { + /* Replace virtual SBDF with the physical one. */ + *sbdf =3D pdev->sbdf; + found =3D true; + break; + } + } + pcidevs_unlock(); + + return found; +} + /* Notify vPCI that device is assigned to guest. */ int vpci_assign_device(struct domain *d, struct pci_dev *pdev) { diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 9cc7071bc0af..d5765301e442 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -274,6 +274,7 @@ static inline void vpci_cancel_pending(const struct pci= _dev *pdev) /* Notify vPCI that device is assigned/de-assigned to/from guest. */ int vpci_assign_device(struct domain *d, struct pci_dev *pdev); int vpci_deassign_device(struct domain *d, struct pci_dev *pdev); +bool vpci_translate_virtual_device(struct domain *d, pci_sbdf_t *sbdf); #else static inline int vpci_assign_device(struct domain *d, struct pci_dev *pde= v) { --=20 2.25.1