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linux-next/arch/x86/kvm/kvm_cache_regs.h
Marcelo Tosatti 5fdbf9765b KVM: x86: accessors for guest registers
As suggested by Avi, introduce accessors to read/write guest registers.
This simplifies the ->cache_regs/->decache_regs interface, and improves
register caching which is important for VMX, where the cost of
vmcs_read/vmcs_write is significant.

[avi: fix warnings]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15 10:13:57 +02:00

33 lines
811 B
C

#ifndef ASM_KVM_CACHE_REGS_H
#define ASM_KVM_CACHE_REGS_H
static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
if (!test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail))
kvm_x86_ops->cache_reg(vcpu, reg);
return vcpu->arch.regs[reg];
}
static inline void kvm_register_write(struct kvm_vcpu *vcpu,
enum kvm_reg reg,
unsigned long val)
{
vcpu->arch.regs[reg] = val;
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
}
static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
{
return kvm_register_read(vcpu, VCPU_REGS_RIP);
}
static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
{
kvm_register_write(vcpu, VCPU_REGS_RIP, val);
}
#endif