KVM: Allow passing 64-bit values to the emulated read/write API
This simplifies the API somewhat (by eliminating the special-case
cmpxchg8b on i386).
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 911c817..6755403 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -970,7 +970,7 @@
}
static int emulator_read_std(unsigned long addr,
- unsigned long *val,
+ void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
@@ -1006,7 +1006,7 @@
}
static int emulator_write_std(unsigned long addr,
- unsigned long val,
+ const void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
@@ -1016,7 +1016,7 @@
}
static int emulator_read_emulated(unsigned long addr,
- unsigned long *val,
+ void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
@@ -1044,7 +1044,7 @@
}
static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
- unsigned long val, int bytes)
+ const void *val, int bytes)
{
struct page *page;
void *virt;
@@ -1057,14 +1057,14 @@
kvm_mmu_pre_write(vcpu, gpa, bytes);
mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
virt = kmap_atomic(page, KM_USER0);
- memcpy(virt + offset_in_page(gpa), &val, bytes);
+ memcpy(virt + offset_in_page(gpa), val, bytes);
kunmap_atomic(virt, KM_USER0);
kvm_mmu_post_write(vcpu, gpa, bytes);
return 1;
}
static int emulator_write_emulated(unsigned long addr,
- unsigned long val,
+ const void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
@@ -1083,14 +1083,14 @@
vcpu->mmio_phys_addr = gpa;
vcpu->mmio_size = bytes;
vcpu->mmio_is_write = 1;
- memcpy(vcpu->mmio_data, &val, bytes);
+ memcpy(vcpu->mmio_data, val, bytes);
return X86EMUL_CONTINUE;
}
static int emulator_cmpxchg_emulated(unsigned long addr,
- unsigned long old,
- unsigned long new,
+ const void *old,
+ const void *new,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
@@ -1103,30 +1103,6 @@
return emulator_write_emulated(addr, new, bytes, ctxt);
}
-#ifdef CONFIG_X86_32
-
-static int emulator_cmpxchg8b_emulated(unsigned long addr,
- unsigned long old_lo,
- unsigned long old_hi,
- unsigned long new_lo,
- unsigned long new_hi,
- struct x86_emulate_ctxt *ctxt)
-{
- static int reported;
- int r;
-
- if (!reported) {
- reported = 1;
- printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
- }
- r = emulator_write_emulated(addr, new_lo, 4, ctxt);
- if (r != X86EMUL_CONTINUE)
- return r;
- return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
-}
-
-#endif
-
static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
return kvm_arch_ops->get_segment_base(vcpu, seg);
@@ -1201,9 +1177,6 @@
.read_emulated = emulator_read_emulated,
.write_emulated = emulator_write_emulated,
.cmpxchg_emulated = emulator_cmpxchg_emulated,
-#ifdef CONFIG_X86_32
- .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
-#endif
};
int emulate_instruction(struct kvm_vcpu *vcpu,