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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] x86/svm: implement debug events
commit 9338a37dd976d95a3cb371bff3e613337a2fdf55
Author: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
AuthorDate: Tue Mar 27 10:26:42 2018 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Mar 27 10:26:42 2018 +0200
x86/svm: implement debug events
At this moment the Debug events for the AMD architecture are not
forwarded to the monitor layer.
This patch adds the Debug event to the common capabilities, adds
the VMEXIT_ICEBP then forwards the event to the monitor layer.
Chapter 2: SVM Processor and Platform Extensions: "Note: A vector 1
exception generated by the single byte INT1
instruction (also known as ICEBP) does not trigger the #DB
intercept. Software should use the dedicated ICEBP
intercept to intercept ICEBP"
Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
---
xen/arch/x86/hvm/svm/emulate.c | 1 +
xen/arch/x86/hvm/svm/svm.c | 65 ++++++++++++++++++++++++++---------
xen/arch/x86/monitor.c | 3 ++
xen/include/asm-x86/hvm/hvm.h | 25 ++++++++++++++
xen/include/asm-x86/hvm/svm/emulate.h | 1 +
xen/include/asm-x86/monitor.h | 4 +--
6 files changed, 81 insertions(+), 18 deletions(-)
diff --git a/xen/arch/x86/hvm/svm/emulate.c b/xen/arch/x86/hvm/svm/emulate.c
index e1a158103c..535674e9dc 100644
--- a/xen/arch/x86/hvm/svm/emulate.c
+++ b/xen/arch/x86/hvm/svm/emulate.c
@@ -65,6 +65,7 @@ static const struct {
} opc_tab[INSTR_MAX_COUNT] = {
[INSTR_PAUSE] = { X86EMUL_OPC_F3(0, 0x90) },
[INSTR_INT3] = { X86EMUL_OPC( 0, 0xcc) },
+ [INSTR_ICEBP] = { X86EMUL_OPC( 0, 0xf1) },
[INSTR_HLT] = { X86EMUL_OPC( 0, 0xf4) },
[INSTR_XSETBV] = { X86EMUL_OPC(0x0f, 0x01), MODRM(3, 2, 1) },
[INSTR_VMRUN] = { X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 0) },
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 8538232f68..1e98adb7c7 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -172,6 +172,24 @@ static void svm_enable_msr_interception(struct domain *d,
uint32_t msr)
svm_intercept_msr(v, msr, MSR_INTERCEPT_WRITE);
}
+static void svm_set_icebp_interception(struct domain *d, bool enable)
+{
+ const struct vcpu *v;
+
+ for_each_vcpu ( d, v )
+ {
+ struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
+ uint32_t intercepts = vmcb_get_general2_intercepts(vmcb);
+
+ if ( enable )
+ intercepts |= GENERAL2_INTERCEPT_ICEBP;
+ else
+ intercepts &= ~GENERAL2_INTERCEPT_ICEBP;
+
+ vmcb_set_general2_intercepts(vmcb, intercepts);
+ }
+}
+
static void svm_save_dr(struct vcpu *v)
{
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
@@ -1109,7 +1127,8 @@ static void noreturn svm_do_resume(struct vcpu *v)
{
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
bool debug_state = (v->domain->debugger_attached ||
- v->domain->arch.monitor.software_breakpoint_enabled);
+ v->domain->arch.monitor.software_breakpoint_enabled ||
+ v->domain->arch.monitor.debug_exception_enabled);
bool_t vcpu_guestmode = 0;
struct vlapic *vlapic = vcpu_vlapic(v);
@@ -2438,19 +2457,6 @@ static bool svm_get_pending_event(struct vcpu *v, struct
x86_event *info)
return true;
}
-static void svm_propagate_intr(struct vcpu *v, unsigned long insn_len)
-{
- struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
- struct x86_event event = {
- .vector = vmcb->eventinj.fields.type,
- .type = vmcb->eventinj.fields.type,
- .error_code = vmcb->exitinfo1,
- };
-
- event.insn_len = insn_len;
- hvm_inject_event(&event);
-}
-
static struct hvm_function_table __initdata svm_function_table = {
.name = "SVM",
.cpu_up_prepare = svm_cpu_up_prepare,
@@ -2490,6 +2496,7 @@ static struct hvm_function_table __initdata
svm_function_table = {
.msr_read_intercept = svm_msr_read_intercept,
.msr_write_intercept = svm_msr_write_intercept,
.enable_msr_interception = svm_enable_msr_interception,
+ .set_icebp_interception = svm_set_icebp_interception,
.set_rdtsc_exiting = svm_set_rdtsc_exiting,
.set_descriptor_access_exiting = svm_set_descriptor_access_exiting,
.get_insn_bytes = svm_get_insn_bytes,
@@ -2656,9 +2663,33 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
HVMTRACE_0D(SMI);
break;
+ case VMEXIT_ICEBP:
case VMEXIT_EXCEPTION_DB:
if ( !v->domain->debugger_attached )
- hvm_inject_hw_exception(TRAP_debug, X86_EVENT_NO_EC);
+ {
+ int rc;
+ unsigned int trap_type;
+
+ if ( likely(exit_reason != VMEXIT_ICEBP) )
+ {
+ trap_type = X86_EVENTTYPE_HW_EXCEPTION;
+ inst_len = 0;
+ }
+ else
+ {
+ trap_type = X86_EVENTTYPE_PRI_SW_EXCEPTION;
+ inst_len = __get_instruction_length(v, INSTR_ICEBP);
+ }
+
+ rc = hvm_monitor_debug(regs->rip,
+ HVM_MONITOR_DEBUG_EXCEPTION,
+ trap_type, inst_len);
+ if ( rc < 0 )
+ goto unexpected_exit_type;
+ if ( !rc )
+ hvm_inject_exception(TRAP_debug,
+ trap_type, inst_len, X86_EVENT_NO_EC);
+ }
else
domain_pause_for_debugger();
break;
@@ -2687,7 +2718,9 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
if ( rc < 0 )
goto unexpected_exit_type;
if ( !rc )
- svm_propagate_intr(v, inst_len);
+ hvm_inject_exception(TRAP_int3,
+ X86_EVENTTYPE_SW_EXCEPTION,
+ inst_len, X86_EVENT_NO_EC);
}
break;
diff --git a/xen/arch/x86/monitor.c b/xen/arch/x86/monitor.c
index 4317658c56..3fb6531f6e 100644
--- a/xen/arch/x86/monitor.c
+++ b/xen/arch/x86/monitor.c
@@ -288,6 +288,9 @@ int arch_monitor_domctl_event(struct domain *d,
ad->monitor.debug_exception_sync = requested_status ?
mop->u.debug_exception.sync :
0;
+
+ hvm_set_icebp_interception(d, requested_status);
+
domain_unpause(d);
break;
}
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index 2376ed6912..0775d0c214 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -209,6 +209,7 @@ struct hvm_function_table {
bool_t access_w, bool_t access_x);
void (*enable_msr_interception)(struct domain *d, uint32_t msr);
+ void (*set_icebp_interception)(struct domain *d, bool enable);
bool_t (*is_singlestep_supported)(void);
/* Alternate p2m */
@@ -407,6 +408,20 @@ void hvm_migrate_pirqs(struct vcpu *v);
void hvm_inject_event(const struct x86_event *event);
+static inline void hvm_inject_exception(
+ unsigned int vector, unsigned int type,
+ unsigned int insn_len, int error_code)
+{
+ struct x86_event event = {
+ .vector = vector,
+ .type = type,
+ .insn_len = insn_len,
+ .error_code = error_code,
+ };
+
+ hvm_inject_event(&event);
+}
+
static inline void hvm_inject_hw_exception(unsigned int vector, int errcode)
{
struct x86_event event = {
@@ -581,6 +596,16 @@ static inline bool_t hvm_enable_msr_interception(struct
domain *d, uint32_t msr)
return 0;
}
+static inline bool hvm_set_icebp_interception(struct domain *d, bool enable)
+{
+ if ( hvm_funcs.set_icebp_interception )
+ {
+ hvm_funcs.set_icebp_interception(d, enable);
+ return true;
+ }
+ return false;
+}
+
static inline bool_t hvm_is_singlestep_supported(void)
{
return (hvm_funcs.is_singlestep_supported &&
diff --git a/xen/include/asm-x86/hvm/svm/emulate.h
b/xen/include/asm-x86/hvm/svm/emulate.h
index 7c1dcd186a..3de8236301 100644
--- a/xen/include/asm-x86/hvm/svm/emulate.h
+++ b/xen/include/asm-x86/hvm/svm/emulate.h
@@ -38,6 +38,7 @@ enum instruction_index {
INSTR_STGI,
INSTR_CLGI,
INSTR_INVLPGA,
+ INSTR_ICEBP,
INSTR_MAX_COUNT /* Must be last - Number of instructions supported */
};
diff --git a/xen/include/asm-x86/monitor.h b/xen/include/asm-x86/monitor.h
index 99ed4b8787..c5a86d1109 100644
--- a/xen/include/asm-x86/monitor.h
+++ b/xen/include/asm-x86/monitor.h
@@ -82,12 +82,12 @@ static inline uint32_t arch_monitor_get_capabilities(struct
domain *d)
(1U << XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR) |
(1U << XEN_DOMCTL_MONITOR_EVENT_INTERRUPT) |
(1U << XEN_DOMCTL_MONITOR_EVENT_CPUID) |
+ (1U << XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION) |
(1U << XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG));
if ( cpu_has_vmx )
{
- capabilities |= ((1U << XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION) |
- (1U << XEN_DOMCTL_MONITOR_EVENT_EMUL_UNIMPLEMENTED));
+ capabilities |= (1U << XEN_DOMCTL_MONITOR_EVENT_EMUL_UNIMPLEMENTED);
/* Since we know this is on VMX, we can just call the hvm func */
if ( hvm_is_singlestep_supported() )
--
generated by git-patchbot for /home/xen/git/xen.git#master
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