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KVM: extend in-kernel mmio to handle >8 byte transactions 

Needed for coalesced mmio using sse.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-01-19 12:51:22 +02:00
parent 1499e54af0
commit 70252a1053
1 changed files with 46 additions and 12 deletions
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58
arch/x86/kvm/x86.c
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@ -3596,20 +3596,43 @@ static void kvm_init_msr_list(void)
static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
const void *v)
{
if (vcpu->arch.apic &&
!kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
return 0;
int handled = 0;
int n;
return kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
do {
n = min(len, 8);
if (!(vcpu->arch.apic &&
!kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
&& kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
break;
handled += n;
addr += n;
len -= n;
v += n;
} while (len);
return handled;
}
static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
{
if (vcpu->arch.apic &&
!kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
return 0;
int handled = 0;
int n;
return kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
do {
n = min(len, 8);
if (!(vcpu->arch.apic &&
!kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
&& kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
break;
trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
handled += n;
addr += n;
len -= n;
v += n;
} while (len);
return handled;
}
static void kvm_set_segment(struct kvm_vcpu *vcpu,
@ -3769,6 +3792,7 @@ static int emulator_read_emulated(unsigned long addr,
struct kvm_vcpu *vcpu)
{
gpa_t gpa;
int handled;
if (vcpu->mmio_read_completed) {
memcpy(val, vcpu->mmio_data, bytes);
@ -3795,10 +3819,14 @@ mmio:
/*
* Is this MMIO handled locally?
*/
if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
handled = vcpu_mmio_read(vcpu, gpa, bytes, val);
if (handled == bytes)
return X86EMUL_CONTINUE;
}
gpa += handled;
bytes -= handled;
val += handled;
trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
@ -3830,6 +3858,7 @@ static int emulator_write_emulated_onepage(unsigned long addr,
struct kvm_vcpu *vcpu)
{
gpa_t gpa;
int handled;
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, exception);
@ -3848,9 +3877,14 @@ mmio:
/*
* Is this MMIO handled locally?
*/
if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
handled = vcpu_mmio_write(vcpu, gpa, bytes, val);
if (handled == bytes)
return X86EMUL_CONTINUE;
gpa += handled;
bytes -= handled;
val += handled;
vcpu->mmio_needed = 1;
vcpu->run->exit_reason = KVM_EXIT_MMIO;
vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;