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Mmap the kvm_run structure

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Mmap the kvm_run structure and print out ->exit_reason in human-readable form
upon exit to make it more visible what's happening after KVM_RUN ioctl() is
called.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:38 +01:00
committed by Will Deacon
parent 73ac60e636
commit 1f9cff2305
1 changed files with 44 additions and 0 deletions
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kvm.c
+44
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@@ -1,14 +1,25 @@
#include "kvm/cpu.h"
#include <linux/kvm.h>
#include <inttypes.h>
#include <sys/mman.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
/*
* Compatibility code. Remove this when we move to tools/kvm.
*/
#ifndef KVM_EXIT_INTERNAL_ERROR
# define KVM_EXIT_INTERNAL_ERROR 17
#endif
struct kvm {
int sys_fd; /* For system ioctls(), i.e. /dev/kvm */
int vm_fd; /* For VM ioctls() */
int vcpu_fd; /* For VCPU ioctls() */
struct kvm_run *kvm_run;
};
static void die(const char *s)
@@ -53,6 +64,7 @@ static struct kvm *kvm__init(void)
{
struct kvm_userspace_memory_region mem;
struct kvm *self;
int mmap_size;
int ret;
self = kvm__new();
@@ -93,6 +105,14 @@ static struct kvm *kvm__init(void)
if (self->vcpu_fd < 0)
die("ioctl(KVM_CREATE_VCPU)");
mmap_size = ioctl(self->sys_fd, KVM_GET_VCPU_MMAP_SIZE, 0);
if (mmap_size < 0)
die("KVM_GET_VCPU_MMAP_SIZE ioctl() failed");
self->kvm_run = mmap(NULL, mmap_size, PROT_READ|PROT_WRITE, MAP_SHARED, self->vcpu_fd, 0);
if (self->kvm_run == MAP_FAILED)
die("unable to mmap vcpu fd");
return self;
}
@@ -105,6 +125,27 @@ static void kvm__run(struct kvm *self)
die("KVM_RUN");
}
static const char *exit_reasons[] = {
[KVM_EXIT_UNKNOWN] = "unknown",
[KVM_EXIT_EXCEPTION] = "exception",
[KVM_EXIT_IO] = "io",
[KVM_EXIT_HYPERCALL] = "hypercall",
[KVM_EXIT_DEBUG] = "debug",
[KVM_EXIT_HLT] = "hlt",
[KVM_EXIT_MMIO] = "mmio",
[KVM_EXIT_IRQ_WINDOW_OPEN] = "irq window open",
[KVM_EXIT_SHUTDOWN] = "shutdown",
[KVM_EXIT_FAIL_ENTRY] = "fail entry",
[KVM_EXIT_INTR] = "intr",
[KVM_EXIT_SET_TPR] = "set tpr",
[KVM_EXIT_TPR_ACCESS] = "trp access",
[KVM_EXIT_S390_SIEIC] = "s390 sieic",
[KVM_EXIT_S390_RESET] = "s390 reset",
[KVM_EXIT_DCR] = "dcr",
[KVM_EXIT_NMI] = "dmi",
[KVM_EXIT_INTERNAL_ERROR] = "internal error",
};
int main(int argc, char *argv[])
{
struct cpu *cpu;
@@ -119,5 +160,8 @@ int main(int argc, char *argv[])
kvm__run(kvm);
fprintf(stderr, "KVM exit reason: %" PRIu32 " (\"%s\")\n",
kvm->kvm_run->exit_reason, exit_reasons[kvm->kvm_run->exit_reason]);
return 0;
}