Use the "internal" variants of setting segment registers when stuffing
state on nested VM-Exit in order to skip the "emulation required"
updates. VM-Exit must always go to protected mode, and all segments are
mostly hardcoded (to valid values) on VM-Exit. The bits of the segments
that aren't hardcoded are explicitly checked during VM-Enter, e.g. the
selector RPLs must all be zero.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 16 ++++++++--------
arch/x86/kvm/vmx/vmx.c | 6 ++----
arch/x86/kvm/vmx/vmx.h | 2 +-
3 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 32126fa0c4d8..f811bb7f2dc3 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4245,7 +4245,7 @@ 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);
seg = (struct kvm_segment) {
.base = 0,
.limit = 0xFFFFFFFF,
@@ -4256,17 +4256,17 @@ 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);
seg.selector = vmcs12->host_es_selector;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
+ __vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
seg.selector = vmcs12->host_ss_selector;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
+ __vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
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);
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);
seg = (struct kvm_segment) {
.base = vmcs12->host_tr_base,
.limit = 0x67,
@@ -4274,11 +4274,11 @@ 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);
memset(&seg, 0, sizeof(seg));
seg.unusable = 1;
- vmx_set_segment(vcpu, &seg, VCPU_SREG_LDTR);
+ __vmx_set_segment(vcpu, &seg, VCPU_SREG_LDTR);
kvm_set_dr(vcpu, 7, 0x400);
vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 37bfa20a04dd..594975dc3f94 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2827,8 +2827,6 @@ static __init int alloc_kvm_area(void)
return 0;
}
-static void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
-
static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg,
struct kvm_segment *save)
{
@@ -3401,7 +3399,7 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var)
return ar;
}
-static void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg)
+void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
@@ -3438,7 +3436,7 @@ static void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, in
vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var));
}
-void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg)
+static void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg)
{
__vmx_set_segment(vcpu, var, seg);
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 19fe09fad2fe..1283ad0e592d 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -376,7 +376,7 @@ void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
void set_cr4_guest_host_mask(struct vcpu_vmx *vmx);
void ept_save_pdptrs(struct kvm_vcpu *vcpu);
void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
-void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
+void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
u64 construct_eptp(struct kvm_vcpu *vcpu, hpa_t root_hpa, int root_level);
void vmx_update_exception_bitmap(struct kvm_vcpu *vcpu);
--
2.31.1.498.g6c1eba8ee3d-goog
