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Subject[PATCH 12/40] KVM: VMX: Support for injecting software exceptions
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

VMX differentiates between processor and software generated exceptions
when injecting them into the guest. Extend vmx_queue_exception
accordingly (and refactor related constants) so that we can use this
service reliably for the new guest debugging framework.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/include/asm/vmx.h | 3 ++-
arch/x86/kvm/vmx.c | 35 ++++++++++++++++++++---------------
2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index d0238e6..32159f0 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -270,8 +270,9 @@ enum vmcs_field {

#define INTR_TYPE_EXT_INTR (0 << 8) /* external interrupt */
#define INTR_TYPE_NMI_INTR (2 << 8) /* NMI */
-#define INTR_TYPE_EXCEPTION (3 << 8) /* processor exception */
+#define INTR_TYPE_HARD_EXCEPTION (3 << 8) /* processor exception */
#define INTR_TYPE_SOFT_INTR (4 << 8) /* software interrupt */
+#define INTR_TYPE_SOFT_EXCEPTION (6 << 8) /* software exception */

/* GUEST_INTERRUPTIBILITY_INFO flags. */
#define GUEST_INTR_STATE_STI 0x00000001
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7611af5..1d974c1 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -189,21 +189,21 @@ static inline int is_page_fault(u32 intr_info)
{
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
INTR_INFO_VALID_MASK)) ==
- (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
+ (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
}

static inline int is_no_device(u32 intr_info)
{
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
INTR_INFO_VALID_MASK)) ==
- (INTR_TYPE_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
+ (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
}

static inline int is_invalid_opcode(u32 intr_info)
{
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
INTR_INFO_VALID_MASK)) ==
- (INTR_TYPE_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
+ (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
}

static inline int is_external_interrupt(u32 intr_info)
@@ -747,29 +747,33 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
bool has_error_code, u32 error_code)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 intr_info = nr | INTR_INFO_VALID_MASK;

- if (has_error_code)
+ if (has_error_code) {
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
+ intr_info |= INTR_INFO_DELIVER_CODE_MASK;
+ }

if (vcpu->arch.rmode.active) {
vmx->rmode.irq.pending = true;
vmx->rmode.irq.vector = nr;
vmx->rmode.irq.rip = kvm_rip_read(vcpu);
- if (nr == BP_VECTOR)
+ if (nr == BP_VECTOR || nr == OF_VECTOR)
vmx->rmode.irq.rip++;
- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- nr | INTR_TYPE_SOFT_INTR
- | (has_error_code ? INTR_INFO_DELIVER_CODE_MASK : 0)
- | INTR_INFO_VALID_MASK);
+ intr_info |= INTR_TYPE_SOFT_INTR;
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
return;
}

- vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
- nr | INTR_TYPE_EXCEPTION
- | (has_error_code ? INTR_INFO_DELIVER_CODE_MASK : 0)
- | INTR_INFO_VALID_MASK);
+ if (nr == BP_VECTOR || nr == OF_VECTOR) {
+ vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
+ intr_info |= INTR_TYPE_SOFT_EXCEPTION;
+ } else
+ intr_info |= INTR_TYPE_HARD_EXCEPTION;
+
+ vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
}

static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
@@ -2650,7 +2654,7 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
}

if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) ==
- (INTR_TYPE_EXCEPTION | 1)) {
+ (INTR_TYPE_HARD_EXCEPTION | 1)) {
kvm_run->exit_reason = KVM_EXIT_DEBUG;
return 0;
}
@@ -3238,7 +3242,8 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
vmx->vcpu.arch.nmi_injected = false;
}
kvm_clear_exception_queue(&vmx->vcpu);
- if (idtv_info_valid && type == INTR_TYPE_EXCEPTION) {
+ if (idtv_info_valid && (type == INTR_TYPE_HARD_EXCEPTION ||
+ type == INTR_TYPE_SOFT_EXCEPTION)) {
if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
error = vmcs_read32(IDT_VECTORING_ERROR_CODE);
kvm_queue_exception_e(&vmx->vcpu, vector, error);
--
1.6.0.6


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