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[PATCH] KVM: Simplify is_long_mode()

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Instead of doing tricky stuff with the arch dependent virtualization
registers, take a peek at the guest's efer.

This simlifies some code, and fixes some confusion in the mmu branch.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity 2006-12-29 16:49:37 -08:00 committed by Linus Torvalds
parent 1e885461f0
commit a9058ecd3c
6 changed files with 14 additions and 18 deletions
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10
drivers/kvm/kvm.h
View File

@ -278,7 +278,6 @@ struct kvm_arch_ops {
struct kvm_segment *var, int seg);
void (*set_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
int (*is_long_mode)(struct kvm_vcpu *vcpu);
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
@ -403,6 +402,15 @@ static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
}
static inline int is_long_mode(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_X86_64
return vcpu->shadow_efer & EFER_LME;
#else
return 0;
#endif
}
static inline int is_pae(struct kvm_vcpu *vcpu)
{
return vcpu->cr4 & CR4_PAE_MASK;

4
drivers/kvm/kvm_main.c
View File

@ -398,7 +398,7 @@ void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
return;
}
if (kvm_arch_ops->is_long_mode(vcpu)) {
if (is_long_mode(vcpu)) {
if (!(cr4 & CR4_PAE_MASK)) {
printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
"in long mode\n");
@ -425,7 +425,7 @@ EXPORT_SYMBOL_GPL(set_cr4);
void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
if (kvm_arch_ops->is_long_mode(vcpu)) {
if (is_long_mode(vcpu)) {
if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
inject_gp(vcpu);

2
drivers/kvm/mmu.c
View File

@ -578,7 +578,7 @@ static int init_kvm_mmu(struct kvm_vcpu *vcpu)
if (!is_paging(vcpu))
return nonpaging_init_context(vcpu);
else if (kvm_arch_ops->is_long_mode(vcpu))
else if (is_long_mode(vcpu))
return paging64_init_context(vcpu);
else if (is_pae(vcpu))
return paging32E_init_context(vcpu);

4
drivers/kvm/paging_tmpl.h
View File

@ -68,7 +68,7 @@ static void FNAME(init_walker)(struct guest_walker *walker,
hpa = safe_gpa_to_hpa(vcpu, vcpu->cr3 & PT64_BASE_ADDR_MASK);
walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0);
ASSERT((!kvm_arch_ops->is_long_mode(vcpu) && is_pae(vcpu)) ||
ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) ||
(vcpu->cr3 & ~(PAGE_MASK | CR3_FLAGS_MASK)) == 0);
walker->table = (pt_element_t *)( (unsigned long)walker->table |
@ -131,7 +131,7 @@ static pt_element_t *FNAME(fetch_guest)(struct kvm_vcpu *vcpu,
(walker->table[index] & PT_PAGE_SIZE_MASK) &&
(PTTYPE == 64 || is_pse(vcpu))))
return &walker->table[index];
if (walker->level != 3 || kvm_arch_ops->is_long_mode(vcpu))
if (walker->level != 3 || is_long_mode(vcpu))
walker->inherited_ar &= walker->table[index];
paddr = safe_gpa_to_hpa(vcpu, walker->table[index] & PT_BASE_ADDR_MASK);
kunmap_atomic(walker->table, KM_USER0);

6
drivers/kvm/svm.c
View File

@ -166,11 +166,6 @@ static inline void write_dr7(unsigned long val)
asm volatile ("mov %0, %%dr7" :: "r" (val));
}
static inline int svm_is_long_mode(struct kvm_vcpu *vcpu)
{
return vcpu->svm->vmcb->save.efer & KVM_EFER_LMA;
}
static inline void force_new_asid(struct kvm_vcpu *vcpu)
{
vcpu->svm->asid_generation--;
@ -1609,7 +1604,6 @@ static struct kvm_arch_ops svm_arch_ops = {
.get_segment_base = svm_get_segment_base,
.get_segment = svm_get_segment,
.set_segment = svm_set_segment,
.is_long_mode = svm_is_long_mode,
.get_cs_db_l_bits = svm_get_cs_db_l_bits,
.set_cr0 = svm_set_cr0,
.set_cr0_no_modeswitch = svm_set_cr0,

6
drivers/kvm/vmx.c
View File

@ -900,11 +900,6 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
vmcs_write32(sf->ar_bytes, ar);
}
static int vmx_is_long_mode(struct kvm_vcpu *vcpu)
{
return vmcs_read32(VM_ENTRY_CONTROLS) & VM_ENTRY_CONTROLS_IA32E_MASK;
}
static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
@ -1975,7 +1970,6 @@ static struct kvm_arch_ops vmx_arch_ops = {
.get_segment_base = vmx_get_segment_base,
.get_segment = vmx_get_segment,
.set_segment = vmx_set_segment,
.is_long_mode = vmx_is_long_mode,
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
.set_cr0 = vmx_set_cr0,
.set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch,