From: Maxim Levitsky mlevitsk@redhat.com
commit c53bbe2145f51d3bc0438c2db02e737b9b598bf3 upstream.
When the guest doesn't enable paging, and NPT/EPT is disabled, we use guest't paging CR3's as KVM's shadow paging pointer and we are technically in direct mode as if we were to use NPT/EPT.
In direct mode we create SPTEs with user mode permissions because usually in the direct mode the NPT/EPT doesn't need to restrict access based on guest CPL (there are MBE/GMET extenstions for that but KVM doesn't use them).
In this special "use guest paging as direct" mode however, and if CR4.SMAP/CR4.SMEP are enabled, that will make the CPU fault on each access and KVM will enter endless loop of page faults.
Since page protection doesn't have any meaning in !PG case, just don't passthrough these bits.
The fix is the same as was done for VMX in commit: commit 656ec4a4928a ("KVM: VMX: fix SMEP and SMAP without EPT")
This fixes the boot of windows 10 without NPT for good. (Without this patch, BSP boots, but APs were stuck in endless loop of page faults, causing the VM boot with 1 CPU)
Signed-off-by: Maxim Levitsky mlevitsk@redhat.com Cc: stable@vger.kernel.org Message-Id: 20220207155447.840194-2-mlevitsk@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/svm/svm.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1795,6 +1795,7 @@ void svm_set_cr0(struct kvm_vcpu *vcpu, { struct vcpu_svm *svm = to_svm(vcpu); u64 hcr0 = cr0; + bool old_paging = is_paging(vcpu);
#ifdef CONFIG_X86_64 if (vcpu->arch.efer & EFER_LME && !vcpu->arch.guest_state_protected) { @@ -1811,8 +1812,11 @@ void svm_set_cr0(struct kvm_vcpu *vcpu, #endif vcpu->arch.cr0 = cr0;
- if (!npt_enabled) + if (!npt_enabled) { hcr0 |= X86_CR0_PG | X86_CR0_WP; + if (old_paging != is_paging(vcpu)) + svm_set_cr4(vcpu, kvm_read_cr4(vcpu)); + }
/* * re-enable caching here because the QEMU bios @@ -1856,8 +1860,12 @@ void svm_set_cr4(struct kvm_vcpu *vcpu, svm_flush_tlb(vcpu);
vcpu->arch.cr4 = cr4; - if (!npt_enabled) + if (!npt_enabled) { cr4 |= X86_CR4_PAE; + + if (!is_paging(vcpu)) + cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE); + } cr4 |= host_cr4_mce; to_svm(vcpu)->vmcb->save.cr4 = cr4; vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);