Re: [PATCH 6.6.y] KVM: VMX: Preserve negative return value in vmx_handle_exit() with bus lock detected

[Sean Christopherson <seanjc@google.com>]

On Thu, Nov 05, 2026, Xiaoyao Li wrote:
> [ Upstream commit cef48693da1e964e9f192bfc16cd0ed287c48337 ]
> 
> Preserve the negative return value from __vmx_handle_exit() when a bus
> lock is detected, instead of always overwriting it with 0.
> 
> The purpose of bus_lock_detected handling is to force a userspace exit to
> inform userspace that a bus lock happened. The negative return value can
> achieve this purpose, and changing the negative value to 0 fails to return
> an error to userspace. So, preserve the negative return value.
> 
> Fixes: fe6b6bc802b4 ("KVM: VMX: Enable bus lock VM exit")
> Cc: stable@vger.kernel.org
> Reported-by: sashiko-bot@kernel.org
> Closes: https://lore.kernel.org/all/20260805034602.5B2BB1F000E9@smtp.kernel.org/
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> Link: https://patch.msgid.link/20260819094903.3060020-7-xiaoyao.li@intel.com
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---

Conflict on the exit_reason field due to lack of 7172c753c26a5 ("KVM: VMX: Move
common fields of struct vcpu_{vmx,tdx} to a struct").

Acked-by: Sean Christopherson <seanjc@google.com>