Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared

[PATCH v5 00/16] Add TDX Guest Support (shared-mm support) · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 01/16] x86/mm: Move force_dma_unencrypted() to common code · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 01/16] x86/mm: Move force_dma_unencrypted() to common code · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
Re: [PATCH v5 01/16] x86/mm: Move force_dma_unencrypted() to common code · Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-20
[PATCH v5 02/16] x86/tdx: Get TD execution environment information via TDINFO · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 03/16] x86/tdx: Exclude Shared bit from physical_mask · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 03/16] x86/tdx: Exclude Shared bit from physical_mask · Sean Christopherson <seanjc@google.com> · 2021-11-05
Re: [PATCH v5 03/16] x86/tdx: Exclude Shared bit from physical_mask · Kirill A. Shutemov <hidden> · 2021-11-08
[PATCH v5 04/16] x86/tdx: Make pages shared in ioremap() · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 04/16] x86/tdx: Make pages shared in ioremap() · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
Re: [PATCH v5 04/16] x86/tdx: Make pages shared in ioremap() · Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-20
[PATCH v5 05/16] x86/tdx: Add helper to do MapGPA hypercall · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 06/16] x86/tdx: Make DMA pages shared · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 06/16] x86/tdx: Make DMA pages shared · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
Re: [PATCH v5 06/16] x86/tdx: Make DMA pages shared · Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-20
Re: [PATCH v5 06/16] x86/tdx: Make DMA pages shared · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
Re: [PATCH v5 06/16] x86/tdx: Make DMA pages shared · Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-20
[PATCH v5 08/16] x86/tdx: ioapic: Add shared bit for IOAPIC base address · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 09/16] x86/tdx: Enable shared memory confidential guest flags for TDX guest · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 07/16] x86/kvm: Use bounce buffers for TD guest · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 07/16] x86/kvm: Use bounce buffers for TD guest · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
Re: [PATCH v5 07/16] x86/kvm: Use bounce buffers for TD guest · Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-20
Re: [PATCH v5 07/16] x86/kvm: Use bounce buffers for TD guest · Tom Lendacky <thomas.lendacky@amd.com> · 2021-10-20
[PATCH v5 10/16] PCI: Consolidate pci_iomap_range(), pci_iomap_wc_range() · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 11/16] asm/io.h: Add ioremap_host_shared fallback · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-09
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Dan Williams <hidden> · 2021-10-09
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-10
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Dan Williams <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Dan Williams <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Dan Williams <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Greg KH <gregkh@linuxfoundation.org> · 2021-10-18
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Dan Williams <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-12
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-14
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-14
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-14
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-14
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-14
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-17
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-14
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Thomas Gleixner <hidden> · 2021-10-17
RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Reshetova, Elena" <elena.reshetova@intel.com> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Thomas Gleixner <hidden> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Thomas Gleixner <hidden> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Greg KH <gregkh@linuxfoundation.org> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-10
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Greg KH <gregkh@linuxfoundation.org> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-18
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Christoph Hellwig <hch@infradead.org> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-11
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Christoph Hellwig <hch@infradead.org> · 2021-10-12
Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range() · Andi Kleen <hidden> · 2021-10-12
[PATCH v5 13/16] PCI: Mark MSI data shared · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 14/16] virtio: Use shared mappings for virtio PCI devices · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 15/16] x86/tdx: Implement ioremap_host_shared for x86 · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
[PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Randy Dunlap <hidden> · 2021-10-09
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@linux.intel.com> · 2021-10-09
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-09
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Andi Kleen <hidden> · 2021-10-11
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-11
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Andi Kleen <hidden> · 2021-10-11
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-11
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-12
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Andi Kleen <hidden> · 2021-10-12
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-12
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · Andi Kleen <hidden> · 2021-10-15
Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared · "Michael S. Tsirkin" <mst@redhat.com> · 2021-10-15

From: Andi Kleen <hidden>
Date: 2021-10-15 05:51:07
Also in: linux-arch, linux-doc, linux-mips, linux-pci, lkml, sparclinux, virtualization

I thought you basically create an OperationRegion of SystemMemory type,
and off you go. Maybe the OSPM in Linux is clever and protects
some memory, I wouldn't know.


I investigated this now, and it looks like acpi is using 
ioremap_cache(). We can hook into that and force non sharing. It's 
probably safe to assume that this is not used on real IO devices.

I think there are still some other BIOS mappings that use just plain 
ioremap() though.


-Andi

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