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Fix up 'ip' in kvm__reset_vcpu() to take real mode into account

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We can't just set 'rip' to 1 MB mark because in real mode, 'ip' is just 16 bits
wide.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg
2010-03-26 17:24:39 +02:00
committed by Will Deacon
parent ce5e0ecbbf
commit 06e41eeadc
1 changed files with 35 additions and 10 deletions
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kvm.c
+35 -10
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@@ -8,6 +8,7 @@
#include <inttypes.h>
#include <sys/mman.h>
#include <stdbool.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
@@ -189,20 +190,31 @@ uint32_t kvm__load_kernel(struct kvm *kvm, const char *kernel_filename)
return ret;
}
static inline uint64_t ip_flat_to_real(struct kvm *self, uint64_t ip)
{
uint64_t cs = self->sregs.cs.selector;
return ip - (cs << 4);
}
static inline uint64_t ip_real_to_flat(struct kvm *self, uint64_t ip)
{
uint64_t cs = self->sregs.cs.selector;
return ip + (cs << 4);
}
void kvm__reset_vcpu(struct kvm *self, uint64_t rip)
{
self->regs = (struct kvm_regs) {
.rip = rip,
.rflags = 0x0000000000000002ULL,
};
if (ioctl(self->vcpu_fd, KVM_SET_REGS, &self->regs) < 0)
die_perror("KVM_SET_REGS failed");
/*
* First set up segmentation because we need to translate the flat
* 'rip' to segmented 16-bit cs:ip address.
*/
self->sregs = (struct kvm_sregs) {
.cr0 = 0x60000010ULL,
.cs = (struct kvm_segment) {
.selector = 0xf000UL,
.selector = 0xfff0UL,
.base = 0xffff0000UL,
.limit = 0xffffU,
.type = 0x0bU,
@@ -265,6 +277,19 @@ void kvm__reset_vcpu(struct kvm *self, uint64_t rip)
if (ioctl(self->vcpu_fd, KVM_SET_SREGS, &self->sregs) < 0)
die_perror("KVM_SET_SREGS failed");
self->regs = (struct kvm_regs) {
/* We start the guest in 16-bit real mode */
.rip = ip_flat_to_real(self, rip),
.rflags = 0x0000000000000002ULL,
};
if (self->regs.rip > USHRT_MAX)
die("ip 0x%" PRIx64 " is too high for real mode", (uint64_t) self->regs.rip);
if (ioctl(self->vcpu_fd, KVM_SET_REGS, &self->regs) < 0)
die_perror("KVM_SET_REGS failed");
}
void kvm__run(struct kvm *self)
@@ -368,14 +393,14 @@ void kvm__show_code(struct kvm *self)
unsigned int i;
uint8_t *ip;
ip = guest_addr_to_host(self, self->regs.rip - code_prologue);
ip = guest_addr_to_host(self, ip_real_to_flat(self, self->regs.rip) - code_prologue);
printf("Code: ");
for (i = 0; i < code_len; i++, ip++) {
c = *ip;
if (ip == guest_addr_to_host(self, self->regs.rip))
if (ip == guest_addr_to_host(self, ip_real_to_flat(self, self->regs.rip)))
printf("<%02x> ", c);
else
printf("%02x ", c);