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KVM: introduce kvm_read_guest_virt, kvm_write_guest_virt

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This commit change the name of emulator_read_std into kvm_read_guest_virt,
and add new function name kvm_write_guest_virt that allow writing into a
guest virtual address.

Signed-off-by: Izik Eidus <ieidus@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Izik Eidus 2008-12-29 01:42:19 +02:00 committed by Avi Kivity
parent 53f658b3c3
commit 77c2002e7c
2 changed files with 42 additions and 18 deletions
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4
arch/x86/include/asm/kvm_host.h
View File

@ -609,10 +609,6 @@ void kvm_inject_nmi(struct kvm_vcpu *vcpu);
void fx_init(struct kvm_vcpu *vcpu);
int emulator_read_std(unsigned long addr,
void *val,
unsigned int bytes,
struct kvm_vcpu *vcpu);
int emulator_write_emulated(unsigned long addr,
const void *val,
unsigned int bytes,

56
arch/x86/kvm/x86.c
View File

@ -1976,10 +1976,8 @@ static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
return dev;
}
int emulator_read_std(unsigned long addr,
void *val,
unsigned int bytes,
struct kvm_vcpu *vcpu)
int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu)
{
void *data = val;
int r = X86EMUL_CONTINUE;
@ -1987,27 +1985,57 @@ int emulator_read_std(unsigned long addr,
while (bytes) {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
if (gpa == UNMAPPED_GVA) {
r = X86EMUL_PROPAGATE_FAULT;
goto out;
}
ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
if (ret < 0) {
r = X86EMUL_UNHANDLEABLE;
goto out;
}
bytes -= tocopy;
data += tocopy;
addr += tocopy;
bytes -= toread;
data += toread;
addr += toread;
}
out:
return r;
}
EXPORT_SYMBOL_GPL(emulator_read_std);
int kvm_write_guest_virt(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu)
{
void *data = val;
int r = X86EMUL_CONTINUE;
while (bytes) {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
if (gpa == UNMAPPED_GVA) {
r = X86EMUL_PROPAGATE_FAULT;
goto out;
}
ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
if (ret < 0) {
r = X86EMUL_UNHANDLEABLE;
goto out;
}
bytes -= towrite;
data += towrite;
addr += towrite;
}
out:
return r;
}
static int emulator_read_emulated(unsigned long addr,
void *val,
@ -2029,8 +2057,8 @@ static int emulator_read_emulated(unsigned long addr,
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
goto mmio;
if (emulator_read_std(addr, val, bytes, vcpu)
== X86EMUL_CONTINUE)
if (kvm_read_guest_virt(addr, val, bytes, vcpu)
== X86EMUL_CONTINUE)
return X86EMUL_CONTINUE;
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
@ -2233,7 +2261,7 @@ void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu);
printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
@ -2241,7 +2269,7 @@ void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
static struct x86_emulate_ops emulate_ops = {
.read_std = emulator_read_std,
.read_std = kvm_read_guest_virt,
.read_emulated = emulator_read_emulated,
.write_emulated = emulator_write_emulated,
.cmpxchg_emulated = emulator_cmpxchg_emulated,