From: Sean Christopherson Date: Fri, 5 Mar 2021 01:10:58 +0000 (-0800) Subject: KVM: x86: Defer the MMU unload to the normal path on an global INVPCID X-Git-Tag: microblaze-v5.14~78^2~237 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=f66c53b3b94f658590e1012bf6d922f8b7e01bda;p=linux-2.6-microblaze.git KVM: x86: Defer the MMU unload to the normal path on an global INVPCID Defer unloading the MMU after a INVPCID until the instruction emulation has completed, i.e. until after RIP has been updated. On VMX, this is a benign bug as VMX doesn't touch the MMU when skipping an emulated instruction. However, on SVM, if nrip is disabled, the emulator is used to skip an instruction, which would lead to fireworks if the emulator were invoked without a valid MMU. Fixes: eb4b248e152d ("kvm: vmx: Support INVPCID in shadow paging mode") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Message-Id: <20210305011101.3597423-15-seanjc@google.com> Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3ef64959a443..5c235b4dd74e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11504,7 +11504,7 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva) fallthrough; case INVPCID_TYPE_ALL_INCL_GLOBAL: - kvm_mmu_unload(vcpu); + kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu); return kvm_skip_emulated_instruction(vcpu); default: