Re: [PATCH v2 0/4] x86/vmware: Hypercall refactoring and improved guest support

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

On 3/9/26 4:52 PM, Alexey Makhalov wrote:
> 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
> 
> 
> Changelog:
> 
> V1 -> V2
>     * Fix compilation warnings in patch 2 "x86/vmware: Log kmsg dump on panic"
>       reported by kernel test robot <lkp@intel.com>
> 
> 
> 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(-)
> 
> 
> base-commit: 7d08a6ad25f85c9bb7d0382142838cb54713f1a3

Gentle reminder to review this change. Thanks,
--Alexey