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A new testcase for guest debugging (gdbstub) that exposed a bunch of

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bugs, mostly for AMD processors.  And a few other x86 fixes.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "A new testcase for guest debugging (gdbstub) that exposed a bunch of
  bugs, mostly for AMD processors. And a few other x86 fixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: Fix off-by-one error in kvm_vcpu_ioctl_x86_setup_mce
  KVM: x86: Fix pkru save/restore when guest CR4.PKE=0, move it to x86.c
  KVM: SVM: Disable AVIC before setting V_IRQ
  KVM: Introduce kvm_make_all_cpus_request_except()
  KVM: VMX: pass correct DR6 for GD userspace exit
  KVM: x86, SVM: isolate vcpu->arch.dr6 from vmcb->save.dr6
  KVM: SVM: keep DR6 synchronized with vcpu->arch.dr6
  KVM: nSVM: trap #DB and #BP to userspace if guest debugging is on
  KVM: selftests: Add KVM_SET_GUEST_DEBUG test
  KVM: X86: Fix single-step with KVM_SET_GUEST_DEBUG
  KVM: X86: Set RTM for DB_VECTOR too for KVM_EXIT_DEBUG
  KVM: x86: fix DR6 delivery for various cases of #DB injection
  KVM: X86: Declare KVM_CAP_SET_GUEST_DEBUG properly
This commit is contained in:
Linus Torvalds 2020-05-16 13:39:22 -07:00
commit 5d438e071f
12 changed files with 325 additions and 88 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/kvm_host.h
View File

@ -578,6 +578,7 @@ struct kvm_vcpu_arch {
unsigned long cr4;
unsigned long cr4_guest_owned_bits;
unsigned long cr8;
u32 host_pkru;
u32 pkru;
u32 hflags;
u64 efer;
@ -1093,8 +1094,6 @@ struct kvm_x86_ops {
void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
u64 (*get_dr6)(struct kvm_vcpu *vcpu);
void (*set_dr6)(struct kvm_vcpu *vcpu, unsigned long value);
void (*sync_dirty_debug_regs)(struct kvm_vcpu *vcpu);
void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
@ -1449,6 +1448,7 @@ bool kvm_rdpmc(struct kvm_vcpu *vcpu);
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr, unsigned long payload);
void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault);

2
arch/x86/kvm/hyperv.c
View File

@ -1427,7 +1427,7 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
*/
kvm_make_vcpus_request_mask(kvm,
KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP,
vcpu_mask, &hv_vcpu->tlb_flush);
NULL, vcpu_mask, &hv_vcpu->tlb_flush);
ret_success:
/* We always do full TLB flush, set rep_done = rep_cnt. */

39
arch/x86/kvm/svm/nested.c
View File

@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <asm/msr-index.h>
#include <asm/debugreg.h>
#include "kvm_emulate.h"
#include "trace.h"
@ -267,7 +268,7 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
svm->vmcb->save.rsp = nested_vmcb->save.rsp;
svm->vmcb->save.rip = nested_vmcb->save.rip;
svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
svm->vcpu.arch.dr6 = nested_vmcb->save.dr6;
svm->vmcb->save.cpl = nested_vmcb->save.cpl;
svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
@ -482,7 +483,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->save.rsp = vmcb->save.rsp;
nested_vmcb->save.rax = vmcb->save.rax;
nested_vmcb->save.dr7 = vmcb->save.dr7;
nested_vmcb->save.dr6 = vmcb->save.dr6;
nested_vmcb->save.dr6 = svm->vcpu.arch.dr6;
nested_vmcb->save.cpl = vmcb->save.cpl;
nested_vmcb->control.int_ctl = vmcb->control.int_ctl;
@ -606,26 +607,45 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
/* DB exceptions for our internal use must not cause vmexit */
static int nested_svm_intercept_db(struct vcpu_svm *svm)
{
unsigned long dr6;
unsigned long dr6 = svm->vmcb->save.dr6;
/* Always catch it and pass it to userspace if debugging. */
if (svm->vcpu.guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
return NESTED_EXIT_HOST;
/* if we're not singlestepping, it's not ours */
if (!svm->nmi_singlestep)
return NESTED_EXIT_DONE;
goto reflected_db;
/* if it's not a singlestep exception, it's not ours */
if (kvm_get_dr(&svm->vcpu, 6, &dr6))
return NESTED_EXIT_DONE;
if (!(dr6 & DR6_BS))
return NESTED_EXIT_DONE;
goto reflected_db;
/* if the guest is singlestepping, it should get the vmexit */
if (svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF) {
disable_nmi_singlestep(svm);
return NESTED_EXIT_DONE;
goto reflected_db;
}
/* it's ours, the nested hypervisor must not see this one */
return NESTED_EXIT_HOST;
reflected_db:
/*
* Synchronize guest DR6 here just like in kvm_deliver_exception_payload;
* it will be moved into the nested VMCB by nested_svm_vmexit. Once
* exceptions will be moved to svm_check_nested_events, all this stuff
* will just go away and we could just return NESTED_EXIT_HOST
* unconditionally. db_interception will queue the exception, which
* will be processed by svm_check_nested_events if a nested vmexit is
* required, and we will just use kvm_deliver_exception_payload to copy
* the payload to DR6 before vmexit.
*/
WARN_ON(svm->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT);
svm->vcpu.arch.dr6 &= ~(DR_TRAP_BITS | DR6_RTM);
svm->vcpu.arch.dr6 |= dr6 & ~DR6_FIXED_1;
return NESTED_EXIT_DONE;
}
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
@ -682,6 +702,9 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
if (svm->nested.intercept_exceptions & excp_bits) {
if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
vmexit = nested_svm_intercept_db(svm);
else if (exit_code == SVM_EXIT_EXCP_BASE + BP_VECTOR &&
svm->vcpu.guest_debug & KVM_GUESTDBG_USE_SW_BP)
vmexit = NESTED_EXIT_HOST;
else
vmexit = NESTED_EXIT_DONE;
}

36
arch/x86/kvm/svm/svm.c
View File

@ -1672,17 +1672,14 @@ static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
mark_dirty(svm->vmcb, VMCB_ASID);
}
static u64 svm_get_dr6(struct kvm_vcpu *vcpu)
static void svm_set_dr6(struct vcpu_svm *svm, unsigned long value)
{
return to_svm(vcpu)->vmcb->save.dr6;
}
struct vmcb *vmcb = svm->vmcb;
static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value)
{
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->save.dr6 = value;
mark_dirty(svm->vmcb, VMCB_DR);
if (unlikely(value != vmcb->save.dr6)) {
vmcb->save.dr6 = value;
mark_dirty(vmcb, VMCB_DR);
}
}
static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
@ -1693,9 +1690,12 @@ static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
get_debugreg(vcpu->arch.db[1], 1);
get_debugreg(vcpu->arch.db[2], 2);
get_debugreg(vcpu->arch.db[3], 3);
vcpu->arch.dr6 = svm_get_dr6(vcpu);
/*
* We cannot reset svm->vmcb->save.dr6 to DR6_FIXED_1|DR6_RTM here,
* because db_interception might need it. We can do it before vmentry.
*/
vcpu->arch.dr6 = svm->vmcb->save.dr6;
vcpu->arch.dr7 = svm->vmcb->save.dr7;
vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
set_dr_intercepts(svm);
}
@ -1739,7 +1739,8 @@ static int db_interception(struct vcpu_svm *svm)
if (!(svm->vcpu.guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
!svm->nmi_singlestep) {
kvm_queue_exception(&svm->vcpu, DB_VECTOR);
u32 payload = (svm->vmcb->save.dr6 ^ DR6_RTM) & ~DR6_FIXED_1;
kvm_queue_exception_p(&svm->vcpu, DB_VECTOR, payload);
return 1;
}
@ -3317,6 +3318,15 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
svm->vmcb->save.cr2 = vcpu->arch.cr2;
/*
* Run with all-zero DR6 unless needed, so that we can get the exact cause
* of a #DB.
*/
if (unlikely(svm->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT))
svm_set_dr6(svm, vcpu->arch.dr6);
else
svm_set_dr6(svm, DR6_FIXED_1 | DR6_RTM);
clgi();
kvm_load_guest_xsave_state(vcpu);
@ -3931,8 +3941,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.set_idt = svm_set_idt,
.get_gdt = svm_get_gdt,
.set_gdt = svm_set_gdt,
.get_dr6 = svm_get_dr6,
.set_dr6 = svm_set_dr6,
.set_dr7 = svm_set_dr7,
.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
.cache_reg = svm_cache_reg,

41
arch/x86/kvm/vmx/vmx.c
View File

@ -1372,7 +1372,6 @@ void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vmx_vcpu_pi_load(vcpu, cpu);
vmx->host_pkru = read_pkru();
vmx->host_debugctlmsr = get_debugctlmsr();
}
@ -4677,15 +4676,13 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
dr6 = vmcs_readl(EXIT_QUALIFICATION);
if (!(vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
vcpu->arch.dr6 &= ~DR_TRAP_BITS;
vcpu->arch.dr6 |= dr6 | DR6_RTM;
if (is_icebp(intr_info))
WARN_ON(!skip_emulated_instruction(vcpu));
kvm_queue_exception(vcpu, DB_VECTOR);
kvm_queue_exception_p(vcpu, DB_VECTOR, dr6);
return 1;
}
kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM;
kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
/* fall through */
case BP_VECTOR:
@ -4929,16 +4926,14 @@ static int handle_dr(struct kvm_vcpu *vcpu)
* guest debugging itself.
*/
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
vcpu->run->debug.arch.dr6 = DR6_BD | DR6_RTM | DR6_FIXED_1;
vcpu->run->debug.arch.dr7 = dr7;
vcpu->run->debug.arch.pc = kvm_get_linear_rip(vcpu);
vcpu->run->debug.arch.exception = DB_VECTOR;
vcpu->run->exit_reason = KVM_EXIT_DEBUG;
return 0;
} else {
vcpu->arch.dr6 &= ~DR_TRAP_BITS;
vcpu->arch.dr6 |= DR6_BD | DR6_RTM;
kvm_queue_exception(vcpu, DB_VECTOR);
kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BD);
return 1;
}
}
@ -4969,15 +4964,6 @@ static int handle_dr(struct kvm_vcpu *vcpu)
return kvm_skip_emulated_instruction(vcpu);
}
static u64 vmx_get_dr6(struct kvm_vcpu *vcpu)
{
return vcpu->arch.dr6;
}
static void vmx_set_dr6(struct kvm_vcpu *vcpu, unsigned long val)
{
}
static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
{
get_debugreg(vcpu->arch.db[0], 0);
@ -6577,11 +6563,6 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
kvm_load_guest_xsave_state(vcpu);
if (static_cpu_has(X86_FEATURE_PKU) &&
kvm_read_cr4_bits(vcpu, X86_CR4_PKE) &&
vcpu->arch.pkru != vmx->host_pkru)
__write_pkru(vcpu->arch.pkru);
pt_guest_enter(vmx);
if (vcpu_to_pmu(vcpu)->version)
@ -6671,18 +6652,6 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
pt_guest_exit(vmx);
/*
* eager fpu is enabled if PKEY is supported and CR4 is switched
* back on host, so it is safe to read guest PKRU from current
* XSAVE.
*/
if (static_cpu_has(X86_FEATURE_PKU) &&
kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) {
vcpu->arch.pkru = rdpkru();
if (vcpu->arch.pkru != vmx->host_pkru)
__write_pkru(vmx->host_pkru);
}
kvm_load_host_xsave_state(vcpu);
vmx->nested.nested_run_pending = 0;
@ -7740,8 +7709,6 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.set_idt = vmx_set_idt,
.get_gdt = vmx_get_gdt,
.set_gdt = vmx_set_gdt,
.get_dr6 = vmx_get_dr6,
.set_dr6 = vmx_set_dr6,
.set_dr7 = vmx_set_dr7,
.sync_dirty_debug_regs = vmx_sync_dirty_debug_regs,
.cache_reg = vmx_cache_reg,

60
arch/x86/kvm/x86.c
View File

@ -572,11 +572,12 @@ void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception);
static void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr,
unsigned long payload)
void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr,
unsigned long payload)
{
kvm_multiple_exception(vcpu, nr, false, 0, true, payload, false);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception_p);
static void kvm_queue_exception_e_p(struct kvm_vcpu *vcpu, unsigned nr,
u32 error_code, unsigned long payload)
@ -836,11 +837,25 @@ void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu)
vcpu->arch.ia32_xss != host_xss)
wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss);
}
if (static_cpu_has(X86_FEATURE_PKU) &&
(kvm_read_cr4_bits(vcpu, X86_CR4_PKE) ||
(vcpu->arch.xcr0 & XFEATURE_MASK_PKRU)) &&
vcpu->arch.pkru != vcpu->arch.host_pkru)
__write_pkru(vcpu->arch.pkru);
}
EXPORT_SYMBOL_GPL(kvm_load_guest_xsave_state);
void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu)
{
if (static_cpu_has(X86_FEATURE_PKU) &&
(kvm_read_cr4_bits(vcpu, X86_CR4_PKE) ||
(vcpu->arch.xcr0 & XFEATURE_MASK_PKRU))) {
vcpu->arch.pkru = rdpkru();
if (vcpu->arch.pkru != vcpu->arch.host_pkru)
__write_pkru(vcpu->arch.host_pkru);
}
if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) {
if (vcpu->arch.xcr0 != host_xcr0)
@ -1045,12 +1060,6 @@ static void kvm_update_dr0123(struct kvm_vcpu *vcpu)
}
}
static void kvm_update_dr6(struct kvm_vcpu *vcpu)
{
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
kvm_x86_ops.set_dr6(vcpu, vcpu->arch.dr6);
}
static void kvm_update_dr7(struct kvm_vcpu *vcpu)
{
unsigned long dr7;
@ -1090,7 +1099,6 @@ static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
if (val & 0xffffffff00000000ULL)
return -1; /* #GP */
vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
kvm_update_dr6(vcpu);
break;
case 5:
/* fall through */
@ -1126,10 +1134,7 @@ int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
case 4:
/* fall through */
case 6:
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
*val = vcpu->arch.dr6;
else
*val = kvm_x86_ops.get_dr6(vcpu);
*val = vcpu->arch.dr6;
break;
case 5:
/* fall through */
@ -3558,6 +3563,9 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_x86_ops.vcpu_load(vcpu, cpu);
/* Save host pkru register if supported */
vcpu->arch.host_pkru = read_pkru();
/* Apply any externally detected TSC adjustments (due to suspend) */
if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
@ -3751,7 +3759,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
unsigned bank_num = mcg_cap & 0xff, bank;
r = -EINVAL;
if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
goto out;
if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
goto out;
@ -4009,7 +4017,6 @@ static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
kvm_update_dr0123(vcpu);
vcpu->arch.dr6 = dbgregs->dr6;
kvm_update_dr6(vcpu);
vcpu->arch.dr7 = dbgregs->dr7;
kvm_update_dr7(vcpu);
@ -6659,7 +6666,7 @@ static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu)
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 | DR6_RTM;
kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip;
kvm_run->debug.arch.pc = kvm_get_linear_rip(vcpu);
kvm_run->debug.arch.exception = DB_VECTOR;
kvm_run->exit_reason = KVM_EXIT_DEBUG;
return 0;
@ -6719,9 +6726,7 @@ static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)
vcpu->arch.db);
if (dr6 != 0) {
vcpu->arch.dr6 &= ~DR_TRAP_BITS;
vcpu->arch.dr6 |= dr6 | DR6_RTM;
kvm_queue_exception(vcpu, DB_VECTOR);
kvm_queue_exception_p(vcpu, DB_VECTOR, dr6);
*r = 1;
return true;
}
@ -8042,7 +8047,7 @@ void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC,
vcpu_bitmap, cpus);
NULL, vcpu_bitmap, cpus);
free_cpumask_var(cpus);
}
@ -8072,6 +8077,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
*/
void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
{
struct kvm_vcpu *except;
unsigned long old, new, expected;
if (!kvm_x86_ops.check_apicv_inhibit_reasons ||
@ -8096,7 +8102,17 @@ void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
trace_kvm_apicv_update_request(activate, bit);
if (kvm_x86_ops.pre_update_apicv_exec_ctrl)
kvm_x86_ops.pre_update_apicv_exec_ctrl(kvm, activate);
kvm_make_all_cpus_request(kvm, KVM_REQ_APICV_UPDATE);
/*
* Sending request to update APICV for all other vcpus,
* while update the calling vcpu immediately instead of
* waiting for another #VMEXIT to handle the request.
*/
except = kvm_get_running_vcpu();
kvm_make_all_cpus_request_except(kvm, KVM_REQ_APICV_UPDATE,
except);
if (except)
kvm_vcpu_update_apicv(except);
}
EXPORT_SYMBOL_GPL(kvm_request_apicv_update);
@ -8420,7 +8436,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
kvm_x86_ops.sync_dirty_debug_regs(vcpu);
kvm_update_dr0123(vcpu);
kvm_update_dr6(vcpu);
kvm_update_dr7(vcpu);
vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
}
@ -9481,7 +9496,6 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
kvm_update_dr0123(vcpu);
vcpu->arch.dr6 = DR6_INIT;
kvm_update_dr6(vcpu);
vcpu->arch.dr7 = DR7_FIXED_1;
kvm_update_dr7(vcpu);

3
include/linux/kvm_host.h
View File

@ -813,8 +813,11 @@ void kvm_flush_remote_tlbs(struct kvm *kvm);
void kvm_reload_remote_mmus(struct kvm *kvm);
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except,
unsigned long *vcpu_bitmap, cpumask_var_t tmp);
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except);
bool kvm_make_cpus_request_mask(struct kvm *kvm, unsigned int req,
unsigned long *vcpu_bitmap);

1
tools/testing/selftests/kvm/Makefile
View File

@ -54,6 +54,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
TEST_GEN_PROGS_x86_64 += x86_64/debug_regs
TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test

2
tools/testing/selftests/kvm/include/kvm_util.h
View File

@ -143,6 +143,8 @@ struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_set_guest_debug(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_guest_debug *debug);
void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_mp_state *mp_state);
void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);

9
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@ -1201,6 +1201,15 @@ void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
ret, errno);
}
void vcpu_set_guest_debug(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_guest_debug *debug)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
int ret = ioctl(vcpu->fd, KVM_SET_GUEST_DEBUG, debug);
TEST_ASSERT(ret == 0, "KVM_SET_GUEST_DEBUG failed: %d", ret);
}
/*
* VM VCPU Set MP State
*

202
tools/testing/selftests/kvm/x86_64/debug_regs.c Normal file
View File

@ -0,0 +1,202 @@
// SPDX-License-Identifier: GPL-2.0
/*
* KVM guest debug register tests
*
* Copyright (C) 2020, Red Hat, Inc.
*/
#include <stdio.h>
#include <string.h>
#include "kvm_util.h"
#include "processor.h"
#define VCPU_ID 0
#define DR6_BD (1 << 13)
#define DR7_GD (1 << 13)
/* For testing data access debug BP */
uint32_t guest_value;
extern unsigned char sw_bp, hw_bp, write_data, ss_start, bd_start;
static void guest_code(void)
{
/*
* Software BP tests.
*
* NOTE: sw_bp need to be before the cmd here, because int3 is an
* exception rather than a normal trap for KVM_SET_GUEST_DEBUG (we
* capture it using the vcpu exception bitmap).
*/
asm volatile("sw_bp: int3");
/* Hardware instruction BP test */
asm volatile("hw_bp: nop");
/* Hardware data BP test */
asm volatile("mov $1234,%%rax;\n\t"
"mov %%rax,%0;\n\t write_data:"
: "=m" (guest_value) : : "rax");
/* Single step test, covers 2 basic instructions and 2 emulated */
asm volatile("ss_start: "
"xor %%rax,%%rax\n\t"
"cpuid\n\t"
"movl $0x1a0,%%ecx\n\t"
"rdmsr\n\t"
: : : "rax", "ecx");
/* DR6.BD test */
asm volatile("bd_start: mov %%dr0, %%rax" : : : "rax");
GUEST_DONE();
}
#define CLEAR_DEBUG() memset(&debug, 0, sizeof(debug))
#define APPLY_DEBUG() vcpu_set_guest_debug(vm, VCPU_ID, &debug)
#define CAST_TO_RIP(v) ((unsigned long long)&(v))
#define SET_RIP(v) do { \
vcpu_regs_get(vm, VCPU_ID, &regs); \
regs.rip = (v); \
vcpu_regs_set(vm, VCPU_ID, &regs); \
} while (0)
#define MOVE_RIP(v) SET_RIP(regs.rip + (v));
int main(void)
{
struct kvm_guest_debug debug;
unsigned long long target_dr6, target_rip;
struct kvm_regs regs;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
uint64_t cmd;
int i;
/* Instruction lengths starting at ss_start */
int ss_size[4] = {
3, /* xor */
2, /* cpuid */
5, /* mov */
2, /* rdmsr */
};
if (!kvm_check_cap(KVM_CAP_SET_GUEST_DEBUG)) {
print_skip("KVM_CAP_SET_GUEST_DEBUG not supported");
return 0;
}
vm = vm_create_default(VCPU_ID, 0, guest_code);
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
run = vcpu_state(vm, VCPU_ID);
/* Test software BPs - int3 */
CLEAR_DEBUG();
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == BP_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(sw_bp),
"INT3: exit %d exception %d rip 0x%llx (should be 0x%llx)",
run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, CAST_TO_RIP(sw_bp));
MOVE_RIP(1);
/* Test instruction HW BP over DR[0-3] */
for (i = 0; i < 4; i++) {
CLEAR_DEBUG();
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[i] = CAST_TO_RIP(hw_bp);
debug.arch.debugreg[7] = 0x400 | (1UL << (2*i+1));
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
target_dr6 = 0xffff0ff0 | (1UL << i);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(hw_bp) &&
run->debug.arch.dr6 == target_dr6,
"INS_HW_BP (DR%d): exit %d exception %d rip 0x%llx "
"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
i, run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, CAST_TO_RIP(hw_bp),
run->debug.arch.dr6, target_dr6);
}
/* Skip "nop" */
MOVE_RIP(1);
/* Test data access HW BP over DR[0-3] */
for (i = 0; i < 4; i++) {
CLEAR_DEBUG();
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[i] = CAST_TO_RIP(guest_value);
debug.arch.debugreg[7] = 0x00000400 | (1UL << (2*i+1)) |
(0x000d0000UL << (4*i));
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
target_dr6 = 0xffff0ff0 | (1UL << i);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(write_data) &&
run->debug.arch.dr6 == target_dr6,
"DATA_HW_BP (DR%d): exit %d exception %d rip 0x%llx "
"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
i, run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, CAST_TO_RIP(write_data),
run->debug.arch.dr6, target_dr6);
/* Rollback the 4-bytes "mov" */
MOVE_RIP(-7);
}
/* Skip the 4-bytes "mov" */
MOVE_RIP(7);
/* Test single step */
target_rip = CAST_TO_RIP(ss_start);
target_dr6 = 0xffff4ff0ULL;
vcpu_regs_get(vm, VCPU_ID, &regs);
for (i = 0; i < (sizeof(ss_size) / sizeof(ss_size[0])); i++) {
target_rip += ss_size[i];
CLEAR_DEBUG();
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
debug.arch.debugreg[7] = 0x00000400;
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == target_rip &&
run->debug.arch.dr6 == target_dr6,
"SINGLE_STEP[%d]: exit %d exception %d rip 0x%llx "
"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
i, run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, target_rip, run->debug.arch.dr6,
target_dr6);
}
/* Finally test global disable */
CLEAR_DEBUG();
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[7] = 0x400 | DR7_GD;
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
target_dr6 = 0xffff0ff0 | DR6_BD;
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(bd_start) &&
run->debug.arch.dr6 == target_dr6,
"DR7.GD: exit %d exception %d rip 0x%llx "
"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, target_rip, run->debug.arch.dr6,
target_dr6);
/* Disable all debug controls, run to the end */
CLEAR_DEBUG();
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, "KVM_EXIT_IO");
cmd = get_ucall(vm, VCPU_ID, &uc);
TEST_ASSERT(cmd == UCALL_DONE, "UCALL_DONE");
kvm_vm_free(vm);
return 0;
}

14
virt/kvm/kvm_main.c
View File

@ -259,6 +259,7 @@ static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
}
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except,
unsigned long *vcpu_bitmap, cpumask_var_t tmp)
{
int i, cpu, me;
@ -268,7 +269,8 @@ bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
me = get_cpu();
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
if ((vcpu_bitmap && !test_bit(i, vcpu_bitmap)) ||
vcpu == except)
continue;
kvm_make_request(req, vcpu);
@ -288,19 +290,25 @@ bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
return called;
}
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except)
{
cpumask_var_t cpus;
bool called;
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus);
called = kvm_make_vcpus_request_mask(kvm, req, except, NULL, cpus);
free_cpumask_var(cpus);
return called;
}
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
{
return kvm_make_all_cpus_request_except(kvm, req, NULL);
}
#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
void kvm_flush_remote_tlbs(struct kvm *kvm)
{