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Thu, 01 Feb 2024 09:02:13 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCXa7/kBApDrW+9oLGL5JuXgqFjsL7REMMsbCNkqEymxKzmK6rPiWX8gjFOgJ9L8ciruSynzi2zHvP4pAUa5PQrrhSdSTpsLNI5FKIRo7qkN7zxWhxL5+OreNCiZeAN0U91XWHZnH50iqfzKV8M= From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper , oxjo@proton.me Subject: [PATCH 1/4] amd-vi: fix IVMD memory type checks Date: Thu, 1 Feb 2024 18:01:56 +0100 Message-ID: <20240201170159.66330-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240201170159.66330-1-roger.pau@citrix.com> References: <20240201170159.66330-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1706806954190100003 The current code that parses the IVMD blocks is relaxed with regard to the restriction that such unity regions should always fall into memory ranges marked as reserved in the memory map. However the type checks for the IVMD addresses are inverted, and as a result IVMD ranges falling into RAM areas are accepted. Note that having such ran= ges in the first place is a firmware bug, as IVMD should always fall into reser= ved ranges. Fixes: ed6c77ebf0c1 ('AMD/IOMMU: check / convert IVMD ranges for being / to= be reserved') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich Tested-by: oxjo --- Cc: oxjo@proton.me --- xen/drivers/passthrough/amd/iommu_acpi.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c b/xen/drivers/passthr= ough/amd/iommu_acpi.c index 2e3b83014beb..ca70f4f3ae2c 100644 --- a/xen/drivers/passthrough/amd/iommu_acpi.c +++ b/xen/drivers/passthrough/amd/iommu_acpi.c @@ -426,9 +426,14 @@ static int __init parse_ivmd_block(const struct acpi_i= vrs_memory *ivmd_block) return -EIO; } =20 - /* Types which won't be handed out are considered good enough.= */ - if ( !(type & (RAM_TYPE_RESERVED | RAM_TYPE_ACPI | - RAM_TYPE_UNUSABLE)) ) + /* + * Types which aren't RAM are considered good enough. + * Note that a page being partially RESERVED, ACPI or UNUSABLE= will + * force Xen into assuming the whole page as having that type = in + * practice. + */ + if ( type & (RAM_TYPE_RESERVED | RAM_TYPE_ACPI | + RAM_TYPE_UNUSABLE) ) continue; =20 AMD_IOMMU_ERROR("IVMD: page at %lx can't be converted\n", addr= ); --=20 2.43.0 From nobody Sat May 18 05:34:48 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=reject dis=none) header.from=citrix.com ARC-Seal: i=1; a=rsa-sha256; t=1706806955; cv=none; d=zohomail.com; s=zohoarc; b=f7BWyDRQhi54JGm+BBPCnnqTc8zS1hodrwGkUaUx5Vb4Ftxm8YjKwhJmt+mqFWMCp1zmtSKaU7Gp6B8byM86gdDn+HCdCFAXPqlVKK9HgMpor17ixQGbonLINJvm5C9jzXX/5uPxD6qVtDy7soQxkHJGg8Gl3SXpDJtiC4/QWCw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1706806955; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Thu, 01 Feb 2024 09:02:14 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCXz9y6qNecsuzFbhqWvYu586TWh1h6wyME4CUQvvl+rXnQoYcXO6n+vN0EpxXhLKl8Wiu3E8XwBAwUKxc2D8TZVTyBcQfdIoGy5xyisZNJMxu6cseqarQdNLbEAC101yEK4quN+35e9TF0/CLdY3xHpZRi1M43P From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper , Wei Liu , Paul Durrant Subject: [PATCH 2/4] iommu/x86: introduce a generic IVMD/RMRR range validity helper Date: Thu, 1 Feb 2024 18:01:57 +0100 Message-ID: <20240201170159.66330-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240201170159.66330-1-roger.pau@citrix.com> References: <20240201170159.66330-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1706806956458100001 IVMD and RMRR ranges are functionally equivalent, and as so could use the s= ame validity checker. Move the IVMD to x86 common IOMMU code and adjust the function to take a pa= ir of [start, end) mfn parameters. So far only the AMD-Vi side is adjusted to use the newly introduced helper,= the VT-d side will be adjusted in a further change. No functional change intended. Signed-off-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/include/asm/iommu.h | 3 ++ xen/drivers/passthrough/amd/iommu_acpi.c | 38 ++------------------ xen/drivers/passthrough/x86/iommu.c | 46 ++++++++++++++++++++++++ 3 files changed, 52 insertions(+), 35 deletions(-) diff --git a/xen/arch/x86/include/asm/iommu.h b/xen/arch/x86/include/asm/io= mmu.h index 15a848ddc329..5c7e37331aad 100644 --- a/xen/arch/x86/include/asm/iommu.h +++ b/xen/arch/x86/include/asm/iommu.h @@ -135,6 +135,9 @@ struct page_info *__must_check iommu_alloc_pgtable(stru= ct domain_iommu *hd, uint64_t contig_mask); void iommu_queue_free_pgtable(struct domain_iommu *hd, struct page_info *p= g); =20 +/* Check [start, end) unity map range for correctness. */ +bool iommu_unity_region_ok(mfn_t start, mfn_t end); + #endif /* !__ARCH_X86_IOMMU_H__ */ /* * Local variables: diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c b/xen/drivers/passthr= ough/amd/iommu_acpi.c index ca70f4f3ae2c..40468dbbccf3 100644 --- a/xen/drivers/passthrough/amd/iommu_acpi.c +++ b/xen/drivers/passthrough/amd/iommu_acpi.c @@ -405,41 +405,9 @@ static int __init parse_ivmd_block(const struct acpi_i= vrs_memory *ivmd_block) return 0; } =20 - if ( !e820_all_mapped(base, limit + PAGE_SIZE, E820_RESERVED) ) - { - paddr_t addr; - - AMD_IOMMU_WARN("IVMD: [%lx,%lx) is not (entirely) in reserved memo= ry\n", - base, limit + PAGE_SIZE); - - for ( addr =3D base; addr <=3D limit; addr +=3D PAGE_SIZE ) - { - unsigned int type =3D page_get_ram_type(maddr_to_mfn(addr)); - - if ( type =3D=3D RAM_TYPE_UNKNOWN ) - { - if ( e820_add_range(addr, addr + PAGE_SIZE, - E820_RESERVED) ) - continue; - AMD_IOMMU_ERROR("IVMD: page at %lx couldn't be reserved\n", - addr); - return -EIO; - } - - /* - * Types which aren't RAM are considered good enough. - * Note that a page being partially RESERVED, ACPI or UNUSABLE= will - * force Xen into assuming the whole page as having that type = in - * practice. - */ - if ( type & (RAM_TYPE_RESERVED | RAM_TYPE_ACPI | - RAM_TYPE_UNUSABLE) ) - continue; - - AMD_IOMMU_ERROR("IVMD: page at %lx can't be converted\n", addr= ); - return -EIO; - } - } + if ( !iommu_unity_region_ok(maddr_to_mfn(base), + maddr_to_mfn(limit + PAGE_SIZE)) ) + return -EIO; =20 if ( ivmd_block->header.flags & ACPI_IVMD_EXCLUSION_RANGE ) exclusion =3D true; diff --git a/xen/drivers/passthrough/x86/iommu.c b/xen/drivers/passthrough/= x86/iommu.c index c90755ff58fa..63d4cb898218 100644 --- a/xen/drivers/passthrough/x86/iommu.c +++ b/xen/drivers/passthrough/x86/iommu.c @@ -792,6 +792,52 @@ static int __init cf_check adjust_irq_affinities(void) } __initcall(adjust_irq_affinities); =20 +bool __init iommu_unity_region_ok(mfn_t start, mfn_t end) +{ + mfn_t addr; + + if ( e820_all_mapped(mfn_to_maddr(start), mfn_to_maddr(end), + E820_RESERVED) ) + return true; + + printk(XENLOG_WARNING "IOMMU: [%#" PRI_mfn " ,%#" PRI_mfn + ") is not (entirely) in reserved memory\n", + mfn_x(start), mfn_x(end)); + + for ( addr =3D start; !mfn_eq(addr, end); mfn_add(addr, 1) ) + { + unsigned int type =3D page_get_ram_type(addr); + + if ( type =3D=3D RAM_TYPE_UNKNOWN ) + { + if ( e820_add_range(mfn_to_maddr(addr), + mfn_to_maddr(addr) + PAGE_SIZE, E820_RESER= VED) ) + continue; + printk(XENLOG_WARNING + "IOMMU: page at %#" PRI_mfn " couldn't be reserved\n", + mfn_x(addr)); + return false; + } + + /* + * Types which aren't RAM are considered good enough. + * Note that a page being partially RESERVED, ACPI or UNUSABLE will + * force Xen into assuming the whole page as having that type in + * practice. + */ + if ( type & (RAM_TYPE_RESERVED | RAM_TYPE_ACPI | + RAM_TYPE_UNUSABLE) ) + continue; + + printk(XENLOG_WARNING + "IOMMU: page at %#" PRI_mfn " can't be converted\n", + mfn_x(addr)); + return false; + } + + return true; +} + /* * Local variables: * mode: C --=20 2.43.0 From nobody Sat May 18 05:34:48 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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Thu, 01 Feb 2024 09:02:16 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCXRcHbpgIR2NyN9m6tWAgLtB7nbJPyYIh6UIkvdWkRs8hEq9Bn5Xp1NNCrN4gxyPsb4MxHHLpBB+H/4soWBdQS6v6r3gQ== From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Kevin Tian Subject: [PATCH 3/4] iommu/vt-d: switch to common RMRR checker Date: Thu, 1 Feb 2024 18:01:58 +0100 Message-ID: <20240201170159.66330-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240201170159.66330-1-roger.pau@citrix.com> References: <20240201170159.66330-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1706806960208100001 Use the newly introduced generic unity map checker. Also drop the message recommending the usage of iommu_inclusive_mapping: the ranges would end up being mapped anyway even if some of the checks above failed, regardless of whether iommu_inclusive_mapping is set. Signed-off-by: Roger Pau Monn=C3=A9 --- xen/drivers/passthrough/vtd/dmar.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/xen/drivers/passthrough/vtd/dmar.c b/xen/drivers/passthrough/v= td/dmar.c index 07772f178fe6..005b42706a34 100644 --- a/xen/drivers/passthrough/vtd/dmar.c +++ b/xen/drivers/passthrough/vtd/dmar.c @@ -642,17 +642,9 @@ acpi_parse_one_rmrr(struct acpi_dmar_header *header) return -EEXIST; } =20 - /* This check is here simply to detect when RMRR values are - * not properly represented in the system memory map and - * inform the user - */ - if ( !e820_all_mapped(base_addr, end_addr + 1, E820_RESERVED) && - !e820_all_mapped(base_addr, end_addr + 1, E820_NVS) && - !e820_all_mapped(base_addr, end_addr + 1, E820_ACPI) ) - printk(XENLOG_WARNING VTDPREFIX - " RMRR [%"PRIx64",%"PRIx64"] not in reserved memory;" - " need \"iommu_inclusive_mapping=3D1\"?\n", - base_addr, end_addr); + if ( !iommu_unity_region_ok(maddr_to_mfn(base_addr), + maddr_to_mfn(end_addr + PAGE_SIZE)) ) + return -EIO; =20 rmrru =3D xzalloc(struct acpi_rmrr_unit); if ( !rmrru ) --=20 2.43.0 From nobody Sat May 18 05:34:48 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=reject dis=none) header.from=citrix.com ARC-Seal: i=1; a=rsa-sha256; t=1706806960; cv=none; d=zohomail.com; s=zohoarc; b=fWaQSuJVvAOpF5WKfWQs4fInGHBa1MDlTp7SWW+GiTOqn5Fwg3GwUlOpLct50bIEeZGMvATzuODba1XQG+oEGNCoDFJl77hnoyE3emLdhvPnqfgqPQ5cjg7KNLVj8KRMKq9W1pJDYfwqRd58MrWneDJw8Odl13A9dsTjPLaqmUs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1706806960; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Thu, 01 Feb 2024 09:02:17 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCWf11yDgkYofRYjl5BKyx2LV56+rtBBpdJEdCgo5EHCP2ZvruGsNYEccw5XEHxjhlu/nPxBONNJtNXsvcabLciBZDfjnbZ8t8I6raIVlOXf From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Paul Durrant Subject: [PATCH 4/4] iommu/x86: make unity range checking more strict Date: Thu, 1 Feb 2024 18:01:59 +0100 Message-ID: <20240201170159.66330-5-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240201170159.66330-1-roger.pau@citrix.com> References: <20240201170159.66330-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1706806962236100003 Currently when a unity range overlaps with memory being used as RAM by the hypervisor the result would be that the IOMMU gets disabled. However that's not enough, as even with the IOMMU disabled the device will still access the affected RAM areas. Note that IVMD or RMRR ranges being placed over RAM is a firmware bug. Doing so also allows to simplify the code and use a switch over the reported memory type(s). Signed-off-by: Roger Pau Monn=C3=A9 --- xen/drivers/passthrough/x86/iommu.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/xen/drivers/passthrough/x86/iommu.c b/xen/drivers/passthrough/= x86/iommu.c index 63d4cb898218..9b977f84582f 100644 --- a/xen/drivers/passthrough/x86/iommu.c +++ b/xen/drivers/passthrough/x86/iommu.c @@ -806,10 +806,14 @@ bool __init iommu_unity_region_ok(mfn_t start, mfn_t = end) =20 for ( addr =3D start; !mfn_eq(addr, end); mfn_add(addr, 1) ) { - unsigned int type =3D page_get_ram_type(addr); - - if ( type =3D=3D RAM_TYPE_UNKNOWN ) + /* + * Any page that's at least partially of type RESERVED, UNUSABLE or + * ACPI will be considered by Xen of being all of that type, and h= ence + * the problematic pages are those that are fully holes or RAM. + */ + switch ( page_get_ram_type(addr) ) { + case RAM_TYPE_UNKNOWN: if ( e820_add_range(mfn_to_maddr(addr), mfn_to_maddr(addr) + PAGE_SIZE, E820_RESER= VED) ) continue; @@ -817,7 +821,10 @@ bool __init iommu_unity_region_ok(mfn_t start, mfn_t e= nd) "IOMMU: page at %#" PRI_mfn " couldn't be reserved\n", mfn_x(addr)); return false; - } + + case RAM_TYPE_CONVENTIONAL: + panic("IOMMU: page at %#" PRI_mfn " overlaps RAM range\n", + mfn_x(addr)); =20 /* * Types which aren't RAM are considered good enough. @@ -825,14 +832,7 @@ bool __init iommu_unity_region_ok(mfn_t start, mfn_t e= nd) * force Xen into assuming the whole page as having that type in * practice. */ - if ( type & (RAM_TYPE_RESERVED | RAM_TYPE_ACPI | - RAM_TYPE_UNUSABLE) ) - continue; - - printk(XENLOG_WARNING - "IOMMU: page at %#" PRI_mfn " can't be converted\n", - mfn_x(addr)); - return false; + } } =20 return true; --=20 2.43.0