[PATCH 0/4] x86/vmware: Hypercall refactoring and improved guest support

[Alexey Makhalov <alexey.makhalov@broadcom.com>]

This series improves VMware guest support on x86 by refactoring the
hypercall infrastructure and adding better crash diagnostics, along
with encrypted guest support for the steal time clock.

The first patch introduces a common vmware_hypercall() backend selected
via static calls. It consolidates the existing hypercall mechanisms
(backdoor, VMCALL/VMMCALL, and TDX) behind a single interface and
selects the optimal implementation at boot. This reduces duplication
and simplifies future extensions.

Building on top of the new hypercall infrastructure, the next two
patches improve post-mortem debugging of VMware guests. They export
panic information to the hypervisor by dumping kernel messages to the
VM vmware.log on the host and explicitly reporting guest crash event
to the hypervisor.

The final patch adds support for encrypted guests by ensuring that the
shared memory used for the steal time clock is mapped as decrypted
before being shared with the hypervisor. This enables steal time
accounting to function correctly when guest memory encryption is
enabled.

Patch overview:

1. x86/vmware: Introduce common vmware_hypercall

   * Consolidate hypercall implementations behind a common API
   * Select backend via static_call at boot

2. x86/vmware: Log kmsg dump on panic

   * Register a kmsg dumper
   * Export panic logs to the host

3. x86/vmware: Report guest crash to the hypervisor

   * Register a panic notifier
   * Notify the hypervisor about guest crashes

4. x86/vmware: Support steal time clock for encrypted guests

   * Mark shared steal time memory as decrypted early in boot


Alexey Makhalov (4):
  x86/vmware: Introduce common vmware_hypercall()
  x86/vmware: Log kmsg dump on panic
  x86/vmware: Report guest crash to the hypervisor
  x86/vmware: Support steal time clock for encrypted guests

 arch/x86/include/asm/vmware.h | 276 ++++++++------------
 arch/x86/kernel/cpu/vmware.c  | 470 +++++++++++++++++++++++++---------
 2 files changed, 463 insertions(+), 283 deletions(-)

-- 
2.43.7