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2c6978ea1a
Secure AVIC hardware accelerates only Self-IPI, i.e. on WRMSR to APIC_SELF_IPI and APIC_ICR (with destination shorthand equal to Self) registers, hardware takes care of updating the APIC_IRR in the APIC backing page of the vCPU. For other IPI types (cross-vCPU, broadcast IPIs), software needs to take care of updating the APIC_IRR state of the target vCPUs and to ensure that the target vCPUs notice the new pending interrupt. Add new callbacks in the Secure AVIC driver for sending IPI requests. These callbacks update the IRR in the target guest vCPU's APIC backing page. To ensure that the remote vCPU notices the new pending interrupt, reuse the GHCB MSR handling code in vc_handle_msr() to issue APIC_ICR MSR-write GHCB protocol event to the hypervisor. For Secure AVIC guests, on APIC_ICR write MSR exits, the hypervisor notifies the target vCPU by either sending an AVIC doorbell (if target vCPU is running) or by waking up the non-running target vCPU. Co-developed-by: Kishon Vijay Abraham I <kvijayab@amd.com> Signed-off-by: Kishon Vijay Abraham I <kvijayab@amd.com> Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tianyu Lan <tiala@microsoft.com> Link: https://lore.kernel.org/20250828110824.208851-1-Neeraj.Upadhyay@amd.com |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.