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KVM: x86: Push potential exception error code on task switches

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When a fault triggers a task switch, the error code, if existent, has to
be pushed on the new task's stack. Implement the missing bits.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2010-04-14 15:51:09 +02:00 committed by Avi Kivity
parent 0760d44868
commit e269fb2189
7 changed files with 48 additions and 10 deletions
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3
arch/x86/include/asm/kvm_emulate.h
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@ -230,6 +230,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops);
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
u16 tss_selector, int reason);
u16 tss_selector, int reason,
bool has_error_code, u32 error_code);
#endif /* _ASM_X86_KVM_X86_EMULATE_H */

3
arch/x86/include/asm/kvm_host.h
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@ -595,7 +595,8 @@ int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code);
void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);

1
arch/x86/include/asm/svm.h
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@ -244,6 +244,7 @@ struct __attribute__ ((__packed__)) vmcb {
#define SVM_EXITINFOSHIFT_TS_REASON_IRET 36
#define SVM_EXITINFOSHIFT_TS_REASON_JMP 38
#define SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE 44
#define SVM_EXIT_READ_CR0 0x000
#define SVM_EXIT_READ_CR3 0x003

20
arch/x86/kvm/emulate.c
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@ -2345,7 +2345,8 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
u16 tss_selector, int reason)
u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
struct desc_struct curr_tss_desc, next_tss_desc;
int ret;
@ -2418,12 +2419,22 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
ops->set_cached_descriptor(&next_tss_desc, VCPU_SREG_TR, ctxt->vcpu);
ops->set_segment_selector(tss_selector, VCPU_SREG_TR, ctxt->vcpu);
if (has_error_code) {
struct decode_cache *c = &ctxt->decode;
c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
c->lock_prefix = 0;
c->src.val = (unsigned long) error_code;
emulate_push(ctxt);
}
return ret;
}
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
u16 tss_selector, int reason)
u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
struct decode_cache *c = &ctxt->decode;
int rc;
@ -2431,12 +2442,15 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
memset(c, 0, sizeof(struct decode_cache));
c->eip = ctxt->eip;
memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
c->dst.type = OP_NONE;
rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason);
rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason,
has_error_code, error_code);
if (rc == X86EMUL_CONTINUE) {
memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(ctxt->vcpu, c->eip);
rc = writeback(ctxt, ops);
}
return rc;

11
arch/x86/kvm/svm.c
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@ -2222,6 +2222,8 @@ static int task_switch_interception(struct vcpu_svm *svm)
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
uint32_t idt_v =
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
bool has_error_code = false;
u32 error_code = 0;
tss_selector = (u16)svm->vmcb->control.exit_info_1;
@ -2242,6 +2244,12 @@ static int task_switch_interception(struct vcpu_svm *svm)
svm->vcpu.arch.nmi_injected = false;
break;
case SVM_EXITINTINFO_TYPE_EXEPT:
if (svm->vmcb->control.exit_info_2 &
(1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
has_error_code = true;
error_code =
(u32)svm->vmcb->control.exit_info_2;
}
kvm_clear_exception_queue(&svm->vcpu);
break;
case SVM_EXITINTINFO_TYPE_INTR:
@ -2258,7 +2266,8 @@ static int task_switch_interception(struct vcpu_svm *svm)
(int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
skip_emulated_instruction(&svm->vcpu);
return kvm_task_switch(&svm->vcpu, tss_selector, reason);
return kvm_task_switch(&svm->vcpu, tss_selector, reason,
has_error_code, error_code);
}
static int cpuid_interception(struct vcpu_svm *svm)

12
arch/x86/kvm/vmx.c
View File

@ -3271,6 +3271,8 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long exit_qualification;
bool has_error_code = false;
u32 error_code = 0;
u16 tss_selector;
int reason, type, idt_v;
@ -3293,6 +3295,13 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)
kvm_clear_interrupt_queue(vcpu);
break;
case INTR_TYPE_HARD_EXCEPTION:
if (vmx->idt_vectoring_info &
VECTORING_INFO_DELIVER_CODE_MASK) {
has_error_code = true;
error_code =
vmcs_read32(IDT_VECTORING_ERROR_CODE);
}
/* fall through */
case INTR_TYPE_SOFT_EXCEPTION:
kvm_clear_exception_queue(vcpu);
break;
@ -3307,7 +3316,8 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)
type != INTR_TYPE_NMI_INTR))
skip_emulated_instruction(vcpu);
if (!kvm_task_switch(vcpu, tss_selector, reason))
if (!kvm_task_switch(vcpu, tss_selector, reason, has_error_code,
error_code))
return 0;
/* clear all local breakpoint enable flags */

6
arch/x86/kvm/x86.c
View File

@ -4778,7 +4778,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
return 0;
}
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
int cs_db, cs_l, ret;
cache_all_regs(vcpu);
@ -4796,7 +4797,8 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
ret = emulator_task_switch(&vcpu->arch.emulate_ctxt, &emulate_ops,
tss_selector, reason);
tss_selector, reason, has_error_code,
error_code);
if (ret == X86EMUL_CONTINUE)
kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);