Commit b30f4dfb authored by David Hildenbrand's avatar David Hildenbrand Committed by Cornelia Huck
Browse files

s390x/kvm: software breakpoint support 



This patch allows to insert and remove sw breakpoints using the QEMU gdbserver
on s390 as well as to interrupt execution on a breakpoint hit when running
with KVM enabled.

Whenever a software breakpoint is inserted, common code calls kvm ioctl
KVM_UPDATE_GUEST_DEBUG. As this method's default on s390 is to return an error
if not implement, the insertion will fail. Therefore, KVM also has to be
updated in order to make use of software breakpoints.

Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarJens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent 8e4e86af

target-s390x/kvm.c

+22 −3
Original line number Diff line number Diff line
@@ -583,6 +583,22 @@ static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run) 
    handle_diag_308(&cpu->env, r1, r3);

}



static int handle_sw_breakpoint(S390CPU *cpu, struct kvm_run *run)

{

    CPUS390XState *env = &cpu->env;

    unsigned long pc;



    cpu_synchronize_state(CPU(cpu));



    pc = env->psw.addr - 4;

    if (kvm_find_sw_breakpoint(CPU(cpu), pc)) {

        env->psw.addr = pc;

        return EXCP_DEBUG;

    }



    return -ENOENT;

}



#define DIAG_KVM_CODE_MASK 0x000000000000ffff



static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
@@ -603,7 +619,7 @@ static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb) 
        r = handle_hypercall(cpu, run);

        break;

    case DIAG_KVM_BREAKPOINT:

        sleep(10);

        r = handle_sw_breakpoint(cpu, run);

        break;

    default:

        DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
@@ -705,7 +721,7 @@ out: 
    return 0;

}



static void handle_instruction(S390CPU *cpu, struct kvm_run *run)

static int handle_instruction(S390CPU *cpu, struct kvm_run *run)

{

    unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);

    uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
@@ -732,8 +748,11 @@ static void handle_instruction(S390CPU *cpu, struct kvm_run *run) 
    }



    if (r < 0) {

        r = 0;

        enter_pgmcheck(cpu, 0x0001);

    }



    return r;

}



static bool is_special_wait_psw(CPUState *cs)
@@ -753,7 +772,7 @@ static int handle_intercept(S390CPU *cpu) 
            (long)cs->kvm_run->psw_addr);

    switch (icpt_code) {

        case ICPT_INSTRUCTION:

            handle_instruction(cpu, run);

            r = handle_instruction(cpu, run);

            break;

        case ICPT_WAITPSW:

            /* disabled wait, since enabled wait is handled in kernel */