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KVM: x86: accessors for guest registers

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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>
This commit is contained in:
Marcelo Tosatti
2008-10-15 10:13:57 +02:00
committed by Avi Kivity
parent ca60dfbb69
commit 5fdbf9765b
7 changed files with 264 additions and 233 deletions
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include/asm-x86/kvm_host.h
+10 -5
View File
@@ -89,7 +89,7 @@ extern struct list_head vm_list;
struct kvm_vcpu;
struct kvm;
enum {
enum kvm_reg {
VCPU_REGS_RAX = 0,
VCPU_REGS_RCX = 1,
VCPU_REGS_RDX = 2,
@@ -108,6 +108,7 @@ enum {
VCPU_REGS_R14 = 14,
VCPU_REGS_R15 = 15,
#endif
VCPU_REGS_RIP,
NR_VCPU_REGS
};
@@ -219,8 +220,13 @@ struct kvm_vcpu_arch {
int interrupt_window_open;
unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
unsigned long rip; /* needs vcpu_load_rsp_rip() */
/*
* rip and regs accesses must go through
* kvm_{register,rip}_{read,write} functions.
*/
unsigned long regs[NR_VCPU_REGS];
u32 regs_avail;
u32 regs_dirty;
unsigned long cr0;
unsigned long cr2;
@@ -414,8 +420,7 @@ struct kvm_x86_ops {
unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
int *exception);
void (*cache_regs)(struct kvm_vcpu *vcpu);
void (*decache_regs)(struct kvm_vcpu *vcpu);
void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);