KVM: VMX: Support Unrestricted Guest feature

"Unrestricted Guest" feature is added in the VMX specification.
Intel Westmere and onwards processors will support this feature.

    It allows kvm guests to run real mode and unpaged mode
code natively in the VMX mode when EPT is turned on. With the
unrestricted guest there is no need to emulate the guest real mode code
in the vm86 container or in the emulator. Also the guest big real mode
code works like native.

  The attached patch enhances KVM to use the unrestricted guest feature
if available on the processor. It also adds a new kernel/module
parameter to disable the unrestricted guest feature at the boot time.

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 54 insertions, 6 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 959cb59cfaeb..f0f9773f0b0f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -51,6 +51,10 @@ module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
 static int __read_mostly enable_ept = 1;
 module_param_named(ept, enable_ept, bool, S_IRUGO);
 
+static int __read_mostly enable_unrestricted_guest = 1;
+module_param_named(unrestricted_guest,
+                        enable_unrestricted_guest, bool, S_IRUGO);
+
 static int __read_mostly emulate_invalid_guest_state = 0;
 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
 
@@ -279,6 +283,12 @@ static inline int cpu_has_vmx_ept(void)
                 SECONDARY_EXEC_ENABLE_EPT;
 }
 
+static inline int cpu_has_vmx_unrestricted_guest(void)
+{
+        return vmcs_config.cpu_based_2nd_exec_ctrl &
+                SECONDARY_EXEC_UNRESTRICTED_GUEST;
+}
+
 static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
 {
         return flexpriority_enabled &&
@@ -1210,7 +1220,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
                 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
                         SECONDARY_EXEC_WBINVD_EXITING |
                         SECONDARY_EXEC_ENABLE_VPID |
-                        SECONDARY_EXEC_ENABLE_EPT;
+                        SECONDARY_EXEC_ENABLE_EPT |
+                        SECONDARY_EXEC_UNRESTRICTED_GUEST;
                 if (adjust_vmx_controls(min2, opt2,
                                         MSR_IA32_VMX_PROCBASED_CTLS2,
                                         &_cpu_based_2nd_exec_control) < 0)
@@ -1340,8 +1351,13 @@ static __init int hardware_setup(void)
         if (!cpu_has_vmx_vpid())
                 enable_vpid = 0;
 
-        if (!cpu_has_vmx_ept())
+        if (!cpu_has_vmx_ept()) {
                 enable_ept = 0;
+                enable_unrestricted_guest = 0;
+        }
+
+        if (!cpu_has_vmx_unrestricted_guest())
+                enable_unrestricted_guest = 0;
 
         if (!cpu_has_vmx_flexpriority())
                 flexpriority_enabled = 0;
@@ -1440,6 +1456,9 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
         unsigned long flags;
         struct vcpu_vmx *vmx = to_vmx(vcpu);
 
+        if (enable_unrestricted_guest)
+                return;
+
         vmx->emulation_required = 1;
         vcpu->arch.rmode.vm86_active = 1;
 
@@ -1593,7 +1612,6 @@ static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
                               CPU_BASED_CR3_STORE_EXITING));
                 vcpu->arch.cr0 = cr0;
                 vmx_set_cr4(vcpu, vcpu->arch.cr4);
-                *hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
                 *hw_cr0 &= ~X86_CR0_WP;
         } else if (!is_paging(vcpu)) {
                 /* From nonpaging to paging */
@@ -1620,8 +1638,13 @@ static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
 
 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
-        unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
-                                KVM_VM_CR0_ALWAYS_ON;
+        unsigned long hw_cr0;
+
+        if (enable_unrestricted_guest)
+                hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
+                        | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
+        else
+                hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
 
         vmx_fpu_deactivate(vcpu);
 
@@ -1786,6 +1809,21 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
                 ar = 0xf3;
         } else
                 ar = vmx_segment_access_rights(var);
+
+        /*
+         *   Fix the "Accessed" bit in AR field of segment registers for older
+         * qemu binaries.
+         *   IA32 arch specifies that at the time of processor reset the
+         * "Accessed" bit in the AR field of segment registers is 1. And qemu
+         * is setting it to 0 in the usedland code. This causes invalid guest
+         * state vmexit when "unrestricted guest" mode is turned on.
+         *    Fix for this setup issue in cpu_reset is being pushed in the qemu
+         * tree. Newer qemu binaries with that qemu fix would not need this
+         * kvm hack.
+         */
+        if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
+                ar |= 0x1; /* Accessed */
+
         vmcs_write32(sf->ar_bytes, ar);
 }
 
@@ -2082,11 +2120,19 @@ out:
 static void seg_setup(int seg)
 {
         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+        unsigned int ar;
 
         vmcs_write16(sf->selector, 0);
         vmcs_writel(sf->base, 0);
         vmcs_write32(sf->limit, 0xffff);
-        vmcs_write32(sf->ar_bytes, 0xf3);
+        if (enable_unrestricted_guest) {
+                ar = 0x93;
+                if (seg == VCPU_SREG_CS)
+                        ar |= 0x08; /* code segment */
+        } else
+                ar = 0xf3;
+
+        vmcs_write32(sf->ar_bytes, ar);
 }
 
 static int alloc_apic_access_page(struct kvm *kvm)
@@ -2229,6 +2275,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
                         exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
                 if (!enable_ept)
                         exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
+                if (!enable_unrestricted_guest)
+                        exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
         }