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Dexuan Cui 2337829504 Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor 
The post_msg_page was removed in
commit 9a6b1a170c ("Drivers: hv: vmbus: Remove the per-CPU post_msg_page")

However, it turns out that we need to bring it back, but only for a TDX VM
with the paravisor: in such a VM, the hyperv_pcpu_input_arg is not decrypted,
but the HVCALL_POST_MESSAGE in such a VM needs a decrypted page as the
hypercall input page: see the comments in hyperv_init() for a detailed
explanation.

Except for HVCALL_POST_MESSAGE and HVCALL_SIGNAL_EVENT, the other hypercalls
in a TDX VM with the paravisor still use hv_hypercall_pg and must use the
hyperv_pcpu_input_arg (which is encrypted in such a VM), when a hypercall
input page is used.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230824080712.30327-8-decui@microsoft.com
2023-08-25 00:04:57 +00:00
arch Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor 2023-08-25 00:04:57 +00:00
block
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Documentation TTY/Serial fixes for 6.5-rc4 2023-07-30 11:51:36 -07:00
drivers Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor 2023-08-25 00:04:57 +00:00
fs
include x86/hyperv: Support hypercalls for fully enlightened TDX guests 2023-08-25 00:04:56 +00:00
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lib Char driver and Documentation fixes for 6.5-rc4 2023-07-30 11:44:00 -07:00
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README

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 Restructured Text 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.