From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Richard Henderson <rth@twiddle.net>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
James E J Bottomley <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
"David S . Miller" <davem@davemloft.net>,
Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>,
"Michael S . Tsirkin" <mst@redhat.com>
Cc: Peter H Anvin <hpa@zytor.com>,
Dave Hansen <dave.hansen@intel.com>,
Tony Luck <tony.luck@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Sean Christopherson <seanjc@google.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,
linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
sparclinux@vger.kernel.org, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range}
Date: Wed, 4 Aug 2021 17:52:14 -0700 [thread overview]
Message-ID: <20210805005218.2912076-12-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com>
From: Andi Kleen <ak@linux.intel.com>
Add a new variant of pci_iomap for mapping all PCI resources
of a devices as shared memory with a hypervisor in a confidential
guest.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
include/asm-generic/pci_iomap.h | 6 +++++
lib/pci_iomap.c | 46 +++++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+)
diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index d4f16dcc2ed7..0178ddd7ad88 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h
@@ -18,6 +18,12 @@ extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
unsigned long offset,
unsigned long maxlen);
+extern void __iomem *pci_iomap_shared(struct pci_dev *dev, int bar,
+ unsigned long max);
+extern void __iomem *pci_iomap_shared_range(struct pci_dev *dev, int bar,
+ unsigned long offset,
+ unsigned long maxlen);
+
/* Create a virtual mapping cookie for a port on a given PCI device.
* Do not call this directly, it exists to make it easier for architectures
* to override */
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index 6251c3f651c6..b04e8689eab3 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -25,6 +25,11 @@ static void __iomem *map_ioremap_wc(phys_addr_t addr, size_t size)
return ioremap_wc(addr, size);
}
+static void __iomem *map_ioremap_shared(phys_addr_t addr, size_t size)
+{
+ return ioremap_shared(addr, size);
+}
+
static void __iomem *pci_iomap_range_map(struct pci_dev *dev,
int bar,
unsigned long offset,
@@ -101,6 +106,47 @@ void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
}
EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
+/**
+ * pci_iomap_shared_range - create a virtual shared mapping cookie for a
+ * PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @offset: map memory at the given offset in BAR
+ * @maxlen: max length of the memory to map
+ *
+ * Remap a pci device's resources shared in a confidential guest.
+ * For more details see pci_iomap_range's documentation.
+ *
+ * @maxlen specifies the maximum length to map. To get access to
+ * the complete BAR from offset to the end, pass %0 here.
+ */
+void __iomem *pci_iomap_shared_range(struct pci_dev *dev, int bar,
+ unsigned long offset, unsigned long maxlen)
+{
+ return pci_iomap_range_map(dev, bar, offset, maxlen,
+ map_ioremap_shared);
+}
+EXPORT_SYMBOL_GPL(pci_iomap_shared_range);
+
+/**
+ * pci_iomap_shared - create a virtual shared mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @maxlen: length of the memory to map
+ *
+ * See pci_iomap for details. This function creates a shared mapping
+ * with the host for confidential hosts.
+ *
+ * @maxlen specifies the maximum length to map. To get access to the
+ * complete BAR without checking for its length first, pass %0 here.
+ */
+void __iomem *pci_iomap_shared(struct pci_dev *dev, int bar,
+ unsigned long maxlen)
+{
+ return pci_iomap_shared_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL_GPL(pci_iomap_shared);
+
/**
* pci_iomap - create a virtual mapping cookie for a PCI BAR
* @dev: PCI device that owns the BAR
--
2.25.1
next prev parent reply other threads:[~2021-08-05 0:54 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 0:52 [PATCH v4 00/15] Add TDX Guest Support (shared-mm support) Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 01/15] x86/mm: Move force_dma_unencrypted() to common code Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 02/15] x86/tdx: Exclude Shared bit from physical_mask Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 03/15] x86/tdx: Make pages shared in ioremap() Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 04/15] x86/tdx: Add helper to do MapGPA hypercall Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 05/15] x86/tdx: Make DMA pages shared Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 06/15] x86/kvm: Use bounce buffers for TD guest Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 07/15] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 08/15] x86/tdx: Enable shared memory protected guest flags for TDX guest Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 09/15] pci: Consolidate pci_iomap* and pci_iomap*wc Kuppuswamy Sathyanarayanan
2021-08-12 19:43 ` Bjorn Helgaas
2021-08-12 22:11 ` Andi Kleen
2021-08-12 22:29 ` Kuppuswamy, Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 10/15] asm/io.h: Add ioremap_shared fallback Kuppuswamy Sathyanarayanan
2021-08-12 19:46 ` Bjorn Helgaas
2021-08-13 7:58 ` Christoph Hellwig
2021-08-05 0:52 ` Kuppuswamy Sathyanarayanan [this message]
2021-08-13 8:02 ` [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} Christoph Hellwig
2021-08-23 23:56 ` Michael S. Tsirkin
2021-08-24 0:30 ` Kuppuswamy, Sathyanarayanan
2021-08-24 1:04 ` Dan Williams
2021-08-24 2:14 ` Andi Kleen
2021-08-24 9:47 ` Michael S. Tsirkin
2021-08-24 17:20 ` Andi Kleen
2021-08-24 18:55 ` Bjorn Helgaas
2021-08-24 20:14 ` Andi Kleen
2021-08-24 20:31 ` Bjorn Helgaas
2021-08-24 20:50 ` Andi Kleen
2021-08-24 21:05 ` Dan Williams
2021-08-25 14:52 ` Bjorn Helgaas
2021-08-24 21:55 ` Rajat Jain
2021-08-29 15:27 ` Michael S. Tsirkin
2021-08-29 16:17 ` Andi Kleen
2021-08-29 22:26 ` Michael S. Tsirkin
2021-08-30 5:11 ` Andi Kleen
2021-08-30 20:59 ` Michael S. Tsirkin
2021-08-31 0:23 ` Andi Kleen
2021-09-10 9:54 ` Michael S. Tsirkin
2021-09-10 16:34 ` Andi Kleen
2021-09-11 23:54 ` Michael S. Tsirkin
2021-09-13 5:53 ` Michael S. Tsirkin
2021-09-24 22:43 ` Andi Kleen
2021-09-27 9:07 ` Michael S. Tsirkin
2021-08-24 21:56 ` Rajat Jain
2021-08-24 21:59 ` Dan Williams
2021-08-24 7:07 ` Christoph Hellwig
2021-08-24 17:04 ` Andi Kleen
2021-08-29 15:34 ` Michael S. Tsirkin
2021-08-29 16:43 ` Andi Kleen
2021-08-24 9:12 ` Michael S. Tsirkin
2021-08-05 0:52 ` [PATCH v4 12/15] pci: Mark MSI data shared Kuppuswamy Sathyanarayanan
2021-08-13 8:07 ` Christoph Hellwig
2021-08-05 0:52 ` [PATCH v4 13/15] virtio: Use shared mappings for virtio PCI devices Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 14/15] x86/tdx: Implement ioremap_shared for x86 Kuppuswamy Sathyanarayanan
2021-08-05 0:52 ` [PATCH v4 15/15] x86/tdx: Add cmdline option to force use of ioremap_shared Kuppuswamy Sathyanarayanan
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