linux-kernel - [PATCH v2 0/3] KVM: VMX: MSR intercept/passthrough cleanup and simplification

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Date: Fri, 23 Feb 2024 12:21:01 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Dongli Zhang <dongli.zhang@...cle.com>
Subject: [PATCH v2 0/3] KVM: VMX: MSR intercept/passthrough cleanup and simplification

Clean up VMX's MSR passthrough code, in particular the portion that deals with
userspace MSR filters (KVM needs to force interception if userspace wants to
intercept even if KVM wants to passthrough).  As pointed out by Dongli, KVM
does a linear walk twice in quick succession, which is wasteful, confuing, and
unnecessarily brittle.

Same exact idea as Dongli's v1[*], just a different approach to cleaning up the
API for dealing with MSR filters.

v2: Combine "check and get" into a single API instead of adding an out param.

Dongli Zhang (2):
  KVM: VMX: fix comment to add LBR to passthrough MSRs
  KVM: VMX: return early if msr_bitmap is not supported

Sean Christopherson (1):
  KVM: VMX: Combine "check" and "get" APIs for passthrough MSR lookups

 arch/x86/kvm/vmx/vmx.c | 68 ++++++++++++++++++------------------------
 1 file changed, 29 insertions(+), 39 deletions(-)

base-commit: ec1e3d33557babed2c2c2c7da6e84293c2f56f58
-- 
2.44.0.rc0.258.g7320e95886-goog