diff options
| author | Krish Sadhukhan <krish.sadhukhan@oracle.com> | 2020-09-21 08:10:25 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-28 07:57:18 -0400 |
| commit | bddd82d19e2e580b11e62f7a1d86ee52d8e437b6 (patch) | |
| tree | 57e9b8a1de95aa67a3bf696327bfefb8beedf7d2 /arch/x86/kvm/vmx/vmx.c | |
| parent | cc5b54dd58d0420c1b1f1e9b29f53327076e9355 (diff) | |
KVM: nVMX: KVM needs to unset "unrestricted guest" VM-execution control in vmcs02 if vmcs12 doesn't set it
Currently, prepare_vmcs02_early() does not check if the "unrestricted guest"
VM-execution control in vmcs12 is turned off and leaves the corresponding
bit on in vmcs02. Due to this setting, vmentry checks which are supposed to
render the nested guest state as invalid when this VM-execution control is
not set, are passing in hardware.
This patch turns off the "unrestricted guest" VM-execution control in vmcs02
if vmcs12 has turned it off.
Suggested-by: Jim Mattson <jmattson@google.com>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <20200921081027.23047-2-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 1d20705193c2..b73901699ecc 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1441,7 +1441,7 @@ void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long old_rflags; - if (enable_unrestricted_guest) { + if (is_unrestricted_guest(vcpu)) { kvm_register_mark_available(vcpu, VCPU_EXREG_RFLAGS); vmx->rflags = rflags; vmcs_writel(GUEST_RFLAGS, rflags); @@ -2240,7 +2240,8 @@ static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & guest_owned_bits; break; case VCPU_EXREG_CR3: - if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) + if (is_unrestricted_guest(vcpu) || + (enable_ept && is_paging(vcpu))) vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); break; case VCPU_EXREG_CR4: @@ -3006,7 +3007,7 @@ void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) unsigned long hw_cr0; hw_cr0 = (cr0 & ~KVM_VM_CR0_ALWAYS_OFF); - if (enable_unrestricted_guest) + if (is_unrestricted_guest(vcpu)) hw_cr0 |= KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; else { hw_cr0 |= KVM_VM_CR0_ALWAYS_ON; @@ -3027,7 +3028,7 @@ void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) } #endif - if (enable_ept && !enable_unrestricted_guest) + if (enable_ept && !is_unrestricted_guest(vcpu)) ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); vmcs_writel(CR0_READ_SHADOW, cr0); @@ -3107,7 +3108,7 @@ int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) unsigned long hw_cr4; hw_cr4 = (cr4_read_shadow() & X86_CR4_MCE) | (cr4 & ~X86_CR4_MCE); - if (enable_unrestricted_guest) + if (is_unrestricted_guest(vcpu)) hw_cr4 |= KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST; else if (vmx->rmode.vm86_active) hw_cr4 |= KVM_RMODE_VM_CR4_ALWAYS_ON; @@ -3142,7 +3143,7 @@ int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) vcpu->arch.cr4 = cr4; kvm_register_mark_available(vcpu, VCPU_EXREG_CR4); - if (!enable_unrestricted_guest) { + if (!is_unrestricted_guest(vcpu)) { if (enable_ept) { if (!is_paging(vcpu)) { hw_cr4 &= ~X86_CR4_PAE; @@ -3282,7 +3283,7 @@ void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) * tree. Newer qemu binaries with that qemu fix would not need this * kvm hack. */ - if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) + if (is_unrestricted_guest(vcpu) && (seg != VCPU_SREG_LDTR)) var->type |= 0x1; /* Accessed */ vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var)); @@ -3473,7 +3474,7 @@ static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) */ static bool guest_state_valid(struct kvm_vcpu *vcpu) { - if (enable_unrestricted_guest) + if (is_unrestricted_guest(vcpu)) return true; /* real mode guest state checks */ |