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KVM: MMU: hypercall based pte updates and TLB flushes

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Hypercall based pte updates are faster than faults, and also allow use
of the lazy MMU mode to batch operations.

Don't report the feature if two dimensional paging is enabled.

[avi:
 - one mmu_op hypercall instead of one per op
 - allow 64-bit gpa on hypercall
 - don't pass host errors (-ENOMEM) to guest]

[akpm: warning fix on i386]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti
2008-02-22 12:21:37 -05:00
committed by Avi Kivity
parent 9f81128591
commit 2f333bcb4e
6 changed files with 190 additions and 3 deletions
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18
arch/x86/kvm/x86.c
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@@ -832,6 +832,9 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_NR_MEMSLOTS:
r = KVM_MEMORY_SLOTS;
break;
case KVM_CAP_PV_MMU:
r = !tdp_enabled;
break;
default:
r = 0;
break;
@@ -2452,9 +2455,19 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_halt);
static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
unsigned long a1)
{
if (is_long_mode(vcpu))
return a0;
else
return a0 | ((gpa_t)a1 << 32);
}
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
{
unsigned long nr, a0, a1, a2, a3, ret;
int r = 1;
kvm_x86_ops->cache_regs(vcpu);
@@ -2476,6 +2489,9 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
case KVM_HC_VAPIC_POLL_IRQ:
ret = 0;
break;
case KVM_HC_MMU_OP:
r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
break;
default:
ret = -KVM_ENOSYS;
break;
@@ -2483,7 +2499,7 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
vcpu->arch.regs[VCPU_REGS_RAX] = ret;
kvm_x86_ops->decache_regs(vcpu);
++vcpu->stat.hypercalls;
return 0;
return r;
}
EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);