linux-kernel - [PATCH V4 0/1] KVM: TDX: Decrease TDX VM shutdown time

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Message-ID: <20250611095158.19398-1-adrian.hunter@intel.com>
Date: Wed, 11 Jun 2025 12:51:57 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: pbonzini@...hat.com,
	seanjc@...gle.com
Cc: kvm@...r.kernel.org,
	rick.p.edgecombe@...el.com,
	kirill.shutemov@...ux.intel.com,
	kai.huang@...el.com,
	reinette.chatre@...el.com,
	xiaoyao.li@...el.com,
	tony.lindgren@...ux.intel.com,
	binbin.wu@...ux.intel.com,
	isaku.yamahata@...el.com,
	linux-kernel@...r.kernel.org,
	yan.y.zhao@...el.com,
	chao.gao@...el.com
Subject: [PATCH V4 0/1] KVM: TDX: Decrease TDX VM shutdown time

Hi

Changes in V4:

	Drop TDX_FLUSHVP_NOT_DONE change.  It will be done separately.
	Use KVM_BUG_ON() instead of WARN_ON().
	Correct kvm_trylock_all_vcpus() return value.

Changes in V3:
	Refer:
            https://lore.kernel.org/r/aAL4dT1pWG5dDDeo@google.com

	Remove KVM_BUG_ON() from tdx_mmu_release_hkid() because it would
	trigger on the error path from __tdx_td_init()

	Put cpus_read_lock() handling back into tdx_mmu_release_hkid()

	Handle KVM_TDX_TERMINATE_VM in the switch statement, i.e. let
	tdx_vm_ioctl() deal with kvm->lock


The version 1 RFC:

	https://lore.kernel.org/all/20250313181629.17764-1-adrian.hunter@intel.com/

listed 3 options and implemented option 2.  Sean replied with code for
option 1, which tested out OK, so here it is plus a commit log.

It depends upon kvm_trylock_all_vcpus(kvm) which is now upstream:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4a454ced74c0ac97c8bd32f086ee3ad74528780


Sean Christopherson (1):
      KVM: TDX: Add sub-ioctl KVM_TDX_TERMINATE_VM

 Documentation/virt/kvm/x86/intel-tdx.rst | 16 +++++++++++++++
 arch/x86/include/uapi/asm/kvm.h          |  1 +
 arch/x86/kvm/vmx/tdx.c                   | 34 ++++++++++++++++++++++++--------
 3 files changed, 43 insertions(+), 8 deletions(-)


Regards
Adrian