This is a note to let you know that I've just added the patch titled KVM: nVMX: Let userspace set nVMX MSR to any _host_ supported value to the 5.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-nvmx-let-userspace-set-nvmx-msr-to-any-_host_-supported-value.patch and it can be found in the queue-5.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f8ae08f9789ad59d318ea75b570caa454aceda81 Mon Sep 17 00:00:00 2001 From: Sean Christopherson <seanjc@xxxxxxxxxx> Date: Tue, 7 Jun 2022 21:35:54 +0000 Subject: KVM: nVMX: Let userspace set nVMX MSR to any _host_ supported value From: Sean Christopherson <seanjc@xxxxxxxxxx> commit f8ae08f9789ad59d318ea75b570caa454aceda81 upstream. Restrict the nVMX MSRs based on KVM's config, not based on the guest's current config. Using the guest's config to audit the new config prevents userspace from restoring the original config (KVM's config) if at any point in the past the guest's config was restricted in any way. Fixes: 62cc6b9dc61e ("KVM: nVMX: support restore of VMX capability MSRs") Cc: stable@xxxxxxxxxxxxxxx Cc: David Matlack <dmatlack@xxxxxxxxxx> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Message-Id: <20220607213604.3346000-6-seanjc@xxxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kvm/vmx/nested.c | 70 ++++++++++++++++++++++++---------------------- 1 file changed, 37 insertions(+), 33 deletions(-) --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -1224,7 +1224,7 @@ static int vmx_restore_vmx_basic(struct BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) | /* reserved */ BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56); - u64 vmx_basic = vmx->nested.msrs.basic; + u64 vmx_basic = vmcs_config.nested.basic; if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved)) return -EINVAL; @@ -1247,36 +1247,42 @@ static int vmx_restore_vmx_basic(struct return 0; } -static int -vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) +static void vmx_get_control_msr(struct nested_vmx_msrs *msrs, u32 msr_index, + u32 **low, u32 **high) { - u64 supported; - u32 *lowp, *highp; - switch (msr_index) { case MSR_IA32_VMX_TRUE_PINBASED_CTLS: - lowp = &vmx->nested.msrs.pinbased_ctls_low; - highp = &vmx->nested.msrs.pinbased_ctls_high; + *low = &msrs->pinbased_ctls_low; + *high = &msrs->pinbased_ctls_high; break; case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: - lowp = &vmx->nested.msrs.procbased_ctls_low; - highp = &vmx->nested.msrs.procbased_ctls_high; + *low = &msrs->procbased_ctls_low; + *high = &msrs->procbased_ctls_high; break; case MSR_IA32_VMX_TRUE_EXIT_CTLS: - lowp = &vmx->nested.msrs.exit_ctls_low; - highp = &vmx->nested.msrs.exit_ctls_high; + *low = &msrs->exit_ctls_low; + *high = &msrs->exit_ctls_high; break; case MSR_IA32_VMX_TRUE_ENTRY_CTLS: - lowp = &vmx->nested.msrs.entry_ctls_low; - highp = &vmx->nested.msrs.entry_ctls_high; + *low = &msrs->entry_ctls_low; + *high = &msrs->entry_ctls_high; break; case MSR_IA32_VMX_PROCBASED_CTLS2: - lowp = &vmx->nested.msrs.secondary_ctls_low; - highp = &vmx->nested.msrs.secondary_ctls_high; + *low = &msrs->secondary_ctls_low; + *high = &msrs->secondary_ctls_high; break; default: BUG(); } +} + +static int +vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) +{ + u32 *lowp, *highp; + u64 supported; + + vmx_get_control_msr(&vmcs_config.nested, msr_index, &lowp, &highp); supported = vmx_control_msr(*lowp, *highp); @@ -1288,6 +1294,7 @@ vmx_restore_control_msr(struct vcpu_vmx if (!is_bitwise_subset(supported, data, GENMASK_ULL(63, 32))) return -EINVAL; + vmx_get_control_msr(&vmx->nested.msrs, msr_index, &lowp, &highp); *lowp = data; *highp = data >> 32; return 0; @@ -1301,10 +1308,8 @@ static int vmx_restore_vmx_misc(struct v BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) | /* reserved */ GENMASK_ULL(13, 9) | BIT_ULL(31); - u64 vmx_misc; - - vmx_misc = vmx_control_msr(vmx->nested.msrs.misc_low, - vmx->nested.msrs.misc_high); + u64 vmx_misc = vmx_control_msr(vmcs_config.nested.misc_low, + vmcs_config.nested.misc_high); if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits)) return -EINVAL; @@ -1332,10 +1337,8 @@ static int vmx_restore_vmx_misc(struct v static int vmx_restore_vmx_ept_vpid_cap(struct vcpu_vmx *vmx, u64 data) { - u64 vmx_ept_vpid_cap; - - vmx_ept_vpid_cap = vmx_control_msr(vmx->nested.msrs.ept_caps, - vmx->nested.msrs.vpid_caps); + u64 vmx_ept_vpid_cap = vmx_control_msr(vmcs_config.nested.ept_caps, + vmcs_config.nested.vpid_caps); /* Every bit is either reserved or a feature bit. */ if (!is_bitwise_subset(vmx_ept_vpid_cap, data, -1ULL)) @@ -1346,20 +1349,21 @@ static int vmx_restore_vmx_ept_vpid_cap( return 0; } -static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) +static u64 *vmx_get_fixed0_msr(struct nested_vmx_msrs *msrs, u32 msr_index) { - u64 *msr; - switch (msr_index) { case MSR_IA32_VMX_CR0_FIXED0: - msr = &vmx->nested.msrs.cr0_fixed0; - break; + return &msrs->cr0_fixed0; case MSR_IA32_VMX_CR4_FIXED0: - msr = &vmx->nested.msrs.cr4_fixed0; - break; + return &msrs->cr4_fixed0; default: BUG(); } +} + +static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) +{ + const u64 *msr = vmx_get_fixed0_msr(&vmcs_config.nested, msr_index); /* * 1 bits (which indicates bits which "must-be-1" during VMX operation) @@ -1368,7 +1372,7 @@ static int vmx_restore_fixed0_msr(struct if (!is_bitwise_subset(data, *msr, -1ULL)) return -EINVAL; - *msr = data; + *vmx_get_fixed0_msr(&vmx->nested.msrs, msr_index) = data; return 0; } @@ -1429,7 +1433,7 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcp vmx->nested.msrs.vmcs_enum = data; return 0; case MSR_IA32_VMX_VMFUNC: - if (data & ~vmx->nested.msrs.vmfunc_controls) + if (data & ~vmcs_config.nested.vmfunc_controls) return -EINVAL; vmx->nested.msrs.vmfunc_controls = data; return 0; Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are queue-5.18/kvm-put-the-extra-pfn-reference-when-reusing-a-pfn-in-the-gpc-cache.patch queue-5.18/kvm-drop-unused-gpa-param-from-gfn-pfn-cache-s-__release_gpc-helper.patch queue-5.18/kvm-nvmx-let-userspace-set-nvmx-msr-to-any-_host_-supported-value.patch queue-5.18/kvm-x86-set-error-code-to-segment-selector-on-lldt-ltr-non-canonical-gp.patch queue-5.18/kvm-nvmx-inject-ud-if-vmxon-is-attempted-with-incompatible-cr0-cr4.patch queue-5.18/kvm-do-not-incorporate-page-offset-into-gfn-pfn-cache-user-address.patch queue-5.18/kvm-svm-don-t-bug-if-userspace-injects-an-interrupt-with-gif-0.patch queue-5.18/kvm-nvmx-snapshot-pre-vm-enter-bndcfgs-for-nested_run_pending-case.patch queue-5.18/kvm-x86-split-kvm_is_valid_cr4-and-export-only-the-non-vendor-bits.patch queue-5.18/kvm-fix-multiple-races-in-gfn-pfn-cache-refresh.patch queue-5.18/kvm-fully-serialize-gfn-pfn-cache-refresh-via-mutex.patch queue-5.18/kvm-x86-mark-tss-busy-during-ltr-emulation-_after_-all-fault-checks.patch queue-5.18/kvm-nvmx-account-for-kvm-reserved-cr4-bits-in-consistency-checks.patch queue-5.18/kvm-nvmx-snapshot-pre-vm-enter-debugctl-for-nested_run_pending-case.patch