linux-kernel - [PATCH v4 0/4] KVM: x86: User-return MSR cleanups

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Message-ID: <20251016222816.141523-1-seanjc@google.com>
Date: Thu, 16 Oct 2025 15:28:12 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	"Kirill A. Shutemov" <kas@...nel.org>
Cc: kvm@...r.kernel.org, x86@...nel.org, linux-coco@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Yan Zhao <yan.y.zhao@...el.com>, 
	Xiaoyao Li <xiaoyao.li@...el.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, 
	Hou Wenlong <houwenlong.hwl@...group.com>
Subject: [PATCH v4 0/4] KVM: x86: User-return MSR cleanups

This is a combo of Hou's series to clean up the "IRQs disabled" mess(es), and
my one-off patch to drop "cache" from a few names that escalated.  I tagged it
v4 since Hou's last posting was v3, and this is much closer to Hou's series
than anything else.

v4:
 - Tweak changelog regarding the "cache" rename to try and better capture
   the details of how .curr is used. [Yan]
 - Synchronize the cache immediately after TD-Exit to minimize the window
   where the cache is stale (even with the reboot change, it's still nice to
   minimize the window). [Yan]
 - Leave the user-return notifier registered on reboot/shutdown so that the
   common code doesn't have to be paranoid about being interrupted.

v3: https://lore.kernel.org/all/15fa59ba7f6f849082fb36735e784071539d5ad2.1758002303.git.houwenlong.hwl@antgroup.com

v1 (cache): https://lore.kernel.org/all/20250919214259.1584273-1-seanjc@google.com

Hou Wenlong (1):
  KVM: x86: Don't disable IRQs when unregistering user-return notifier

Sean Christopherson (3):
  KVM: TDX: Synchronize user-return MSRs immediately after VP.ENTER
  KVM: x86: Leave user-return notifier registered on reboot/shutdown
  KVM: x86: Drop "cache" from user return MSR setter that skips WRMSR

 arch/x86/include/asm/kvm_host.h |  4 +--
 arch/x86/kvm/vmx/tdx.c          | 28 ++++++++++-------
 arch/x86/kvm/vmx/tdx.h          |  2 +-
 arch/x86/kvm/x86.c              | 56 +++++++++++++++++++--------------
 4 files changed, 53 insertions(+), 37 deletions(-)


base-commit: f222788458c8a7753d43befef2769cd282dc008e
-- 
2.51.0.858.gf9c4a03a3a-goog