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Date: Mon, 27 Nov 2006 12:38:38 -0000
From: Avi Kivity <avi@...ranet.com>
To: kvm-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, akpm@...l.org
Subject: [PATCH 28/38] KVM: Add an arch accessor for cs d/b and l bits
These are used for detecting the current processor mode.
Signed-off-by: Avi Kivity <avi@...ranet.com>
Index: linux-2.6/drivers/kvm/kvm.h
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm.h
+++ linux-2.6/drivers/kvm/kvm.h
@@ -269,6 +269,7 @@ struct kvm_arch_ops {
struct kvm_segment *var, int seg);
void (*set_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
+ void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -517,15 +517,16 @@ void set_cr0(struct kvm_vcpu *vcpu, unsi
if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
#ifdef __x86_64__
if ((vcpu->shadow_efer & EFER_LME)) {
- u32 guest_cs_ar;
+ int cs_db, cs_l;
+
if (!is_pae(vcpu)) {
printk(KERN_DEBUG "set_cr0: #GP, start paging "
"in long mode while PAE is disabled\n");
inject_gp(vcpu);
return;
}
- guest_cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
- if (guest_cs_ar & SEGMENT_AR_L_MASK) {
+ kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+ if (cs_l) {
printk(KERN_DEBUG "set_cr0: #GP, start paging "
"in long mode while CS.L == 1\n");
inject_gp(vcpu);
@@ -1109,18 +1110,18 @@ int emulate_instruction(struct kvm_vcpu
{
struct x86_emulate_ctxt emulate_ctxt;
int r;
- u32 cs_ar;
+ int cs_db, cs_l;
kvm_arch_ops->cache_regs(vcpu);
- cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
+ kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
emulate_ctxt.vcpu = vcpu;
emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
emulate_ctxt.cr2 = cr2;
emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
- ? X86EMUL_MODE_REAL : (cs_ar & AR_L_MASK)
- ? X86EMUL_MODE_PROT64 : (cs_ar & AR_DB_MASK)
+ ? X86EMUL_MODE_REAL : cs_l
+ ? X86EMUL_MODE_PROT64 : cs_db
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -698,6 +698,14 @@ static void vmx_set_segment(struct kvm_v
vmcs_write32(sf->ar_bytes, ar);
}
+static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
+{
+ u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
+
+ *db = (ar >> 14) & 1;
+ *l = (ar >> 13) & 1;
+}
+
static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
@@ -1730,6 +1738,7 @@ static struct kvm_arch_ops vmx_arch_ops
.get_segment_base = vmx_get_segment_base,
.get_segment = vmx_get_segment,
.set_segment = vmx_set_segment,
+ .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
.set_cr0 = vmx_set_cr0,
.set_cr3 = vmx_set_cr3,
.set_cr4 = vmx_set_cr4,
-
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