[PATCH RFC 1/2] add functions to read and set the ldt

[Izik Eidus <izike@qumranet.com>]

>From 28f36d30f8eef9c12afe52e183bf4c8405d113d2 Mon Sep 17 00:00:00 2001
From: Izik Eidus <izike@qumranet.com>
Date: Thu, 13 Mar 2008 02:03:37 +0200
Subject: [PATCH] KVM: vmx, svm add functions to read and set the ldt

Signed-off-by: Izik Eidus <izike@qumranet.com>
---
 arch/x86/kvm/svm.c         |   18 ++++++++++++++++++
 arch/x86/kvm/vmx.c         |   14 ++++++++++++++
 include/asm-x86/kvm_host.h |    2 ++
 3 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 51741f9..4e1dd61 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -824,6 +824,22 @@ static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 	svm->vmcb->save.gdtr.base = dt->base ;
 }
 
+static void svm_get_ldt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+
+	dt->limit = svm->vmcb->save.ldtr.limit;
+	dt->base = svm->vmcb->save.ldtr.base;
+}
+
+static void svm_set_ldt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+
+	svm->vmcb->save.ldtr.limit = dt->limit;
+	svm->vmcb->save.ldtr.base = dt->base ;
+}
+
 static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
 {
 }
@@ -1832,6 +1848,8 @@ static struct kvm_x86_ops svm_x86_ops = {
 	.set_idt = svm_set_idt,
 	.get_gdt = svm_get_gdt,
 	.set_gdt = svm_set_gdt,
+	.get_ldt = svm_get_ldt,
+	.set_ldt = svm_set_ldt,
 	.get_dr = svm_get_dr,
 	.set_dr = svm_set_dr,
 	.cache_regs = svm_cache_regs,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9951ec9..459b0bd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1476,6 +1476,18 @@ static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 	vmcs_writel(GUEST_GDTR_BASE, dt->base);
 }
 
+static void vmx_get_ldt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+	dt->limit = vmcs_read32(GUEST_LDTR_LIMIT);
+	dt->base = vmcs_readl(GUEST_LDTR_BASE);
+}
+
+static void vmx_set_ldt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+{
+	vmcs_write32(GUEST_LDTR_LIMIT, dt->limit);
+	vmcs_writel(GUEST_LDTR_BASE, dt->base);
+}
+
 static int init_rmode_tss(struct kvm *kvm)
 {
 	gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
@@ -2674,6 +2686,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.set_idt = vmx_set_idt,
 	.get_gdt = vmx_get_gdt,
 	.set_gdt = vmx_set_gdt,
+	.get_ldt = vmx_get_ldt,
+	.set_ldt = vmx_set_ldt,
 	.cache_regs = vcpu_load_rsp_rip,
 	.decache_regs = vcpu_put_rsp_rip,
 	.get_rflags = vmx_get_rflags,
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 12932bb..d9806e2 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -386,6 +386,8 @@ struct kvm_x86_ops {
 	void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
+	void (*get_ldt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
+	void (*set_ldt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 	void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 		       int *exception);
-- 
1.5.3.6

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