Add dedicated helpers to emulate RESET (or at least, the parts of RESET that KVM actually emulates) instead of having the relevant code scattered throughout vcpu_create() and vcpu_reset(). Vitaly's innocuous suggestion to WARN on non-zero CR0 led to a wonderful bit of git archaeology after, to my complete surprise, it fired on RESET due to fx_init() setting CR0.ET (and XCR0.FP). v2: - Add patches to drop defunct fx_init() code. - Add patch to zero CR3 at RESET/INIT. - Add patch to mark all regs avail/dirty at creation, not at RESET/INIT. - Add patch to WARN if CRs are non-zero at RESET. [Vitaly] v1: https://lkml.kernel.org/r/20210914230840.3030620-1-seanjc@xxxxxxxxxx Sean Christopherson (10): KVM: x86: Mark all registers as avail/dirty at vCPU creation KVM: x86: Clear KVM's cached guest CR3 at RESET/INIT KVM: x86: Do not mark all registers as avail/dirty during RESET/INIT KVM: x86: Remove defunct setting of CR0.ET for guests during vCPU create KVM: x86: Remove defunct setting of XCR0 for guest during vCPU create KVM: x86: Fold fx_init() into kvm_arch_vcpu_create() KVM: VMX: Drop explicit zeroing of MSR guest values at vCPU creation KVM: VMX: Move RESET emulation to vmx_vcpu_reset() KVM: SVM: Move RESET emulation to svm_vcpu_reset() KVM: x86: WARN on non-zero CRs at RESET to detect improper initalization arch/x86/kvm/svm/sev.c | 6 ++-- arch/x86/kvm/svm/svm.c | 29 ++++++++++-------- arch/x86/kvm/svm/svm.h | 2 +- arch/x86/kvm/vmx/vmx.c | 68 ++++++++++++++++++++---------------------- arch/x86/kvm/x86.c | 44 +++++++++++++-------------- 5 files changed, 76 insertions(+), 73 deletions(-) -- 2.33.0.464.g1972c5931b-goog
