[PATCH 2/5] KVM: x86: retrieve CPL in KVM_GET_SREGS, prepare to be able to set it
From: Paolo Bonzini
Date: Tue May 13 2014 - 10:56:04 EST
For the set path, this patch never uses the new code so there
is no semantic change.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/include/uapi/asm/kvm.h | 5 ++++-
arch/x86/kvm/svm.c | 13 ++++++++++---
arch/x86/kvm/vmx.c | 36 +++++++++++++++++++++++-------------
arch/x86/kvm/x86.c | 24 ++++++++++++------------
5 files changed, 50 insertions(+), 30 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e21aee98a5c2..0bc2d91c8a97 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -689,7 +689,7 @@ struct kvm_x86_ops {
struct kvm_segment *var, int seg);
int (*get_cpl)(struct kvm_vcpu *vcpu);
void (*set_segment)(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg);
+ struct kvm_segment *var, int seg, bool set_cpl);
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
void (*decache_cr3)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index d3a87780c70b..4e80c624d0b3 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -126,7 +126,10 @@ struct kvm_segment {
__u8 type;
__u8 present, dpl, db, s, l, g, avl;
__u8 unusable;
- __u8 padding;
+ union {
+ __u8 padding;
+ __u8 cpl;
+ };
};
struct kvm_dtable {
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 0b7d58d0c5fb..647e47653a9b 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -203,6 +203,7 @@ module_param(nested, int, S_IRUGO);
static void svm_flush_tlb(struct kvm_vcpu *vcpu);
static void svm_complete_interrupts(struct vcpu_svm *svm);
+static int svm_get_cpl(struct kvm_vcpu *vcpu);
static int nested_svm_exit_handled(struct vcpu_svm *svm);
static int nested_svm_intercept(struct vcpu_svm *svm);
@@ -1445,6 +1446,7 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
* Intel's VMENTRY has a check on the 'G' bit.
*/
var->g = s->limit > 0xfffff;
+ var->cpl = svm_get_cpl(vcpu);
break;
case VCPU_SREG_TR:
/*
@@ -1611,7 +1613,8 @@ static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
}
static void svm_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
+ struct kvm_segment *var, int seg,
+ bool set_cpl)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_seg *s = svm_seg(vcpu, seg);
@@ -1631,8 +1634,12 @@ static void svm_set_segment(struct kvm_vcpu *vcpu,
s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
}
- if (seg == VCPU_SREG_CS)
- svm_update_cpl(vcpu);
+ if (seg == VCPU_SREG_CS) {
+ if (set_cpl)
+ svm->vmcb->save.cpl = var->cpl;
+ else
+ svm_update_cpl(vcpu);
+ }
mark_dirty(svm->vmcb, VMCB_SEG);
}
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a56a4acda82c..10256c27694d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -733,9 +733,10 @@ static void kvm_cpu_vmxoff(void);
static bool vmx_mpx_supported(void);
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
static void vmx_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg);
+ struct kvm_segment *var, int seg, bool set_cpl);
static void vmx_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
+static int vmx_get_cpl(struct kvm_vcpu *vcpu);
static bool guest_state_valid(struct kvm_vcpu *vcpu);
static u32 vmx_segment_access_rights(struct kvm_segment *var);
static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu);
@@ -3109,7 +3110,7 @@ static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg,
save->dpl = save->selector & SELECTOR_RPL_MASK;
save->s = 1;
}
- vmx_set_segment(vcpu, save, seg);
+ vmx_set_segment(vcpu, save, seg, false);
}
static void enter_pmode(struct kvm_vcpu *vcpu)
@@ -3132,7 +3133,7 @@ static void enter_pmode(struct kvm_vcpu *vcpu)
vmx_segment_cache_clear(vmx);
- vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR);
+ vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR, false);
flags = vmcs_readl(GUEST_RFLAGS);
flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
@@ -3538,6 +3539,9 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
var->l = (ar >> 13) & 1;
var->db = (ar >> 14) & 1;
var->g = (ar >> 15) & 1;
+
+ if (seg == VCPU_SREG_CS)
+ var->cpl = vmx_get_cpl(vcpu);
}
static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
@@ -3592,14 +3596,20 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var)
}
static void vmx_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
+ struct kvm_segment *var, int seg,
+ bool set_cpl)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
vmx_segment_cache_clear(vmx);
- if (seg == VCPU_SREG_CS)
- __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
+ if (seg == VCPU_SREG_CS) {
+ if (set_cpl) {
+ __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
+ vmx->cpl = var->cpl;
+ } else
+ __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
+ }
if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) {
vmx->rmode.segs[seg] = *var;
@@ -8600,7 +8610,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
seg.l = 1;
else
seg.db = 1;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_CS);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_CS, false);
seg = (struct kvm_segment) {
.base = 0,
.limit = 0xFFFFFFFF,
@@ -8611,17 +8621,17 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
.g = 1
};
seg.selector = vmcs12->host_ds_selector;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_DS);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_DS, false);
seg.selector = vmcs12->host_es_selector;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_ES, false);
seg.selector = vmcs12->host_ss_selector;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_SS, false);
seg.selector = vmcs12->host_fs_selector;
seg.base = vmcs12->host_fs_base;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_FS);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_FS, false);
seg.selector = vmcs12->host_gs_selector;
seg.base = vmcs12->host_gs_base;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_GS);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_GS, false);
seg = (struct kvm_segment) {
.base = vmcs12->host_tr_base,
.limit = 0x67,
@@ -8629,7 +8639,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
.type = 11,
.present = 1
};
- vmx_set_segment(vcpu, &seg, VCPU_SREG_TR);
+ vmx_set_segment(vcpu, &seg, VCPU_SREG_TR, false);
kvm_set_dr(vcpu, 7, 0x400);
vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8e0532fc4d96..ca0a1d38fa51 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4033,9 +4033,9 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
}
static void kvm_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
+ struct kvm_segment *var, int seg, int set_cpl)
{
- kvm_x86_ops->set_segment(vcpu, var, seg);
+ kvm_x86_ops->set_segment(vcpu, var, seg, set_cpl);
}
void kvm_get_segment(struct kvm_vcpu *vcpu,
@@ -4848,7 +4848,7 @@ static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
var.unusable = !var.present;
var.padding = 0;
- kvm_set_segment(vcpu, &var, seg);
+ kvm_set_segment(vcpu, &var, seg, false);
return;
}
@@ -6678,15 +6678,15 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
pr_debug("Set back pending irq %d\n", pending_vec);
}
- kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
- kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
- kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
- kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
- kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
- kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
+ kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS, false);
+ kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS, false);
+ kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES, false);
+ kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS, false);
+ kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS, false);
+ kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS, false);
- kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
- kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
+ kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR, false);
+ kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR, false);
update_cr8_intercept(vcpu);
@@ -6976,7 +6976,7 @@ void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, unsigned int vector)
kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
cs.selector = vector << 8;
cs.base = vector << 12;
- kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
+ kvm_set_segment(vcpu, &cs, VCPU_SREG_CS, false);
kvm_rip_write(vcpu, 0);
}
--
1.8.3.1
--
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