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

Sean Christopherson
2025-10-16T22:28:19Z

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