kernel.git/arch/x86/include/asm/mshyperv.h, branch linux-5.12.y

iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition

2021-02-11T08:47:07Z

Just like MSI/MSI-X, IO-APIC interrupts are remapped by Microsoft Hypervisor when Linux runs as the root partition. Implement an IRQ domain to handle mapping and unmapping of IO-APIC interrupts. Signed-off-by: Wei Liu Acked-by: Joerg Roedel Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-17-wei.liu@kernel.org

x86/hyperv: implement an MSI domain for root partition

2021-02-11T08:47:07Z

When Linux runs as the root partition on Microsoft Hypervisor, its interrupts are remapped. Linux will need to explicitly map and unmap interrupts for hardware. Implement an MSI domain to issue the correct hypercalls. And initialize this irq domain as the default MSI irq domain. Signed-off-by: Sunil Muthuswamy Co-Developed-by: Sunil Muthuswamy Signed-off-by: Wei Liu Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-16-wei.liu@kernel.org

asm-generic/hyperv: update hv_msi_entry

2021-02-11T08:47:06Z

We will soon need to access fields inside the MSI address and MSI data fields. Introduce hv_msi_address_register and hv_msi_data_register. Fix up one user of hv_msi_entry in mshyperv.h. No functional change expected. Signed-off-by: Wei Liu Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-12-wei.liu@kernel.org

x86/hyperv: provide a bunch of helper functions

2021-02-11T08:47:06Z

They are used to deposit pages into Microsoft Hypervisor and bring up logical and virtual processors. Signed-off-by: Lillian Grassin-Drake Signed-off-by: Sunil Muthuswamy Signed-off-by: Nuno Das Neves Co-Developed-by: Lillian Grassin-Drake Co-Developed-by: Sunil Muthuswamy Co-Developed-by: Nuno Das Neves Signed-off-by: Wei Liu Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-10-wei.liu@kernel.org

x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary

2021-02-11T08:47:06Z

We will need the partition ID for executing some hypercalls later. Signed-off-by: Lillian Grassin-Drake Co-Developed-by: Sunil Muthuswamy Signed-off-by: Wei Liu Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-7-wei.liu@kernel.org

x86/hyperv: allocate output arg pages if required

2021-02-11T08:47:06Z

When Linux runs as the root partition, it will need to make hypercalls which return data from the hypervisor. Allocate pages for storing results when Linux runs as the root partition. Signed-off-by: Lillian Grassin-Drake Co-Developed-by: Lillian Grassin-Drake Signed-off-by: Wei Liu Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-6-wei.liu@kernel.org

x86/hyperv: detect if Linux is the root partition

2021-02-11T08:47:05Z

For now we can use the privilege flag to check. Stash the value to be used later. Put in a bunch of defines for future use when we want to have more fine-grained detection. Signed-off-by: Wei Liu Reviewed-by: Pavel Tatashin Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20210203150435.27941-3-wei.liu@kernel.org

x86/hyperv: Fix kexec panic/hang issues

2021-01-05T17:52:04Z

Currently the kexec kernel can panic or hang due to 2 causes: 1) hv_cpu_die() is not called upon kexec, so the hypervisor corrupts the old VP Assist Pages when the kexec kernel runs. The same issue is fixed for hibernation in commit 421f090c819d ("x86/hyperv: Suspend/resume the VP assist page for hibernation"). Now fix it for kexec. 2) hyperv_cleanup() is called too early. In the kexec path, the other CPUs are stopped in hv_machine_shutdown() -> native_machine_shutdown(), so between hv_kexec_handler() and native_machine_shutdown(), the other CPUs can still try to access the hypercall page and cause panic. The workaround "hv_hypercall_pg = NULL;" in hyperv_cleanup() is unreliabe. Move hyperv_cleanup() to a better place. Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20201222065541.24312-1-decui@microsoft.com Signed-off-by: Wei Liu

Drivers: hv: vmbus: Add parsing of VMbus interrupt in ACPI DSDT

2020-10-14T19:14:51Z

On ARM64, Hyper-V now specifies the interrupt to be used by VMbus in the ACPI DSDT. This information is not used on x86 because the interrupt vector must be hardcoded. But update the generic VMbus driver to do the parsing and pass the information to the architecture specific code that sets up the Linux IRQ. Update consumers of the interrupt to get it from an architecture specific function. Signed-off-by: Michael Kelley Link: https://lore.kernel.org/r/1597434304-40631-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu

x86/hyperv: Make hv_setup_sched_clock inline

2020-08-11T10:41:15Z

Make hv_setup_sched_clock inline so the reference to pv_ops works correctly with objtool updates to detect noinstr violations. See https://lore.kernel.org/patchwork/patch/1283635/ Signed-off-by: Michael Kelley Acked-by: Peter Zijlstra (Intel) Acked-by: Thomas Gleixner Link: https://lore.kernel.org/r/1597022991-24088-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu