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Subject[PATCH 4/6] KVM: SVM: Add manipulation functions for exception intercepts
Date
This patch wraps changes to the exception intercepts of SVM
into seperate functions to abstract nested-svm better and
prepare the implementation of the vmcb-clean-bits feature.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kvm/svm.c | 58 ++++++++++++++++++++++++++--------------------------
1 files changed, 29 insertions(+), 29 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 5250a2b..783142e 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -259,6 +259,24 @@ static inline void clr_dr_intercept(struct vcpu_svm *svm, int bit)
recalc_intercepts(svm);
}

+static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
+{
+ struct vmcb *vmcb = get_host_vmcb(svm);
+
+ vmcb->control.intercept_exceptions |= (1U << bit);
+
+ recalc_intercepts(svm);
+}
+
+static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
+{
+ struct vmcb *vmcb = get_host_vmcb(svm);
+
+ vmcb->control.intercept_exceptions &= ~(1U << bit);
+
+ recalc_intercepts(svm);
+}
+
static inline void enable_gif(struct vcpu_svm *svm)
{
svm->vcpu.arch.hflags |= HF_GIF_MASK;
@@ -840,10 +858,9 @@ static void init_vmcb(struct vcpu_svm *svm)
set_dr_intercept(svm, INTERCEPT_DR6_WRITE);
set_dr_intercept(svm, INTERCEPT_DR7_WRITE);

- control->intercept_exceptions = (1 << PF_VECTOR) |
- (1 << UD_VECTOR) |
- (1 << MC_VECTOR);
-
+ set_exception_intercept(svm, PF_VECTOR);
+ set_exception_intercept(svm, UD_VECTOR);
+ set_exception_intercept(svm, MC_VECTOR);

control->intercept = (1ULL << INTERCEPT_INTR) |
(1ULL << INTERCEPT_NMI) |
@@ -920,7 +937,7 @@ static void init_vmcb(struct vcpu_svm *svm)
control->nested_ctl = 1;
control->intercept &= ~((1ULL << INTERCEPT_TASK_SWITCH) |
(1ULL << INTERCEPT_INVLPG));
- control->intercept_exceptions &= ~(1 << PF_VECTOR);
+ clr_exception_intercept(svm, PF_VECTOR);
clr_cr_intercept(svm, INTERCEPT_CR3_READ);
clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
save->g_pat = 0x0007040600070406ULL;
@@ -1381,20 +1398,18 @@ static void update_db_intercept(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);

- svm->vmcb->control.intercept_exceptions &=
- ~((1 << DB_VECTOR) | (1 << BP_VECTOR));
+ clr_exception_intercept(svm, DB_VECTOR);
+ clr_exception_intercept(svm, BP_VECTOR);

if (svm->nmi_singlestep)
- svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR);
+ set_exception_intercept(svm, DB_VECTOR);

if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
if (vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
- svm->vmcb->control.intercept_exceptions |=
- 1 << DB_VECTOR;
+ set_exception_intercept(svm, DB_VECTOR);
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
- svm->vmcb->control.intercept_exceptions |=
- 1 << BP_VECTOR;
+ set_exception_intercept(svm, BP_VECTOR);
} else
vcpu->guest_debug = 0;
}
@@ -1515,21 +1530,8 @@ static int ud_interception(struct vcpu_svm *svm)
static void svm_fpu_activate(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
- u32 excp;
-
- if (is_guest_mode(vcpu)) {
- u32 h_excp, n_excp;

- h_excp = svm->nested.hsave->control.intercept_exceptions;
- n_excp = svm->nested.intercept_exceptions;
- h_excp &= ~(1 << NM_VECTOR);
- excp = h_excp | n_excp;
- } else {
- excp = svm->vmcb->control.intercept_exceptions;
- excp &= ~(1 << NM_VECTOR);
- }
-
- svm->vmcb->control.intercept_exceptions = excp;
+ clr_exception_intercept(svm, NM_VECTOR);

svm->vcpu.fpu_active = 1;
update_cr0_intercept(svm);
@@ -3635,9 +3637,7 @@ static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);

- svm->vmcb->control.intercept_exceptions |= 1 << NM_VECTOR;
- if (is_guest_mode(vcpu))
- svm->nested.hsave->control.intercept_exceptions |= 1 << NM_VECTOR;
+ set_exception_intercept(svm, NM_VECTOR);
update_cr0_intercept(svm);
}

--
1.7.1



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