[PATCH 9/38] KVM: Cache guest cr4 in vcpu structure

From: Avi Kivity
Date: Mon Nov 27 2006 - 07:20:04 EST

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This eliminates needing to have an arch operation to get cr4.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>

Index: linux-2.6/drivers/kvm/kvm.h
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm.h
+++ linux-2.6/drivers/kvm/kvm.h
@@ -168,6 +168,7 @@ struct kvm_vcpu {

unsigned long cr2;
unsigned long cr3;
+ unsigned long cr4;
unsigned long cr8;
u64 shadow_efer;
u64 apic_base;
@@ -335,20 +336,14 @@ static inline int is_long_mode(void)
return vmcs_read32(VM_ENTRY_CONTROLS) & VM_ENTRY_CONTROLS_IA32E_MASK;
}

-static inline unsigned long guest_cr4(void)
+static inline int is_pae(struct kvm_vcpu *vcpu)
{
- return (vmcs_readl(CR4_READ_SHADOW) & KVM_GUEST_CR4_MASK) |
- (vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK);
+ return vcpu->cr4 & CR4_PAE_MASK;
}

-static inline int is_pae(void)
+static inline int is_pse(struct kvm_vcpu *vcpu)
{
- return guest_cr4() & CR4_PAE_MASK;
-}
-
-static inline int is_pse(void)
-{
- return guest_cr4() & CR4_PSE_MASK;
+ return vcpu->cr4 & CR4_PSE_MASK;
}

static inline unsigned long guest_cr0(void)
Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -940,7 +940,7 @@ static void set_cr0(struct kvm_vcpu *vcp
#ifdef __x86_64__
if ((vcpu->shadow_efer & EFER_LME)) {
u32 guest_cs_ar;
- if (!is_pae()) {
+ if (!is_pae(vcpu)) {
printk(KERN_DEBUG "set_cr0: #GP, start paging "
"in long mode while PAE is disabled\n");
inject_gp(vcpu);
@@ -956,7 +956,7 @@ static void set_cr0(struct kvm_vcpu *vcp
}
} else
#endif
- if (is_pae() &&
+ if (is_pae(vcpu) &&
pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
"reserved bits\n");
@@ -993,6 +993,7 @@ static void __set_cr4(struct kvm_vcpu *v
vmcs_writel(CR4_READ_SHADOW, cr4);
vmcs_writel(GUEST_CR4, cr4 | (vcpu->rmode.active ?
KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON));
+ vcpu->cr4 = cr4;
}

static void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
@@ -1010,7 +1011,7 @@ static void set_cr4(struct kvm_vcpu *vcp
inject_gp(vcpu);
return;
}
- } else if (is_paging() && !is_pae() && (cr4 & CR4_PAE_MASK)
+ } else if (is_paging() && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
&& pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
inject_gp(vcpu);
@@ -1041,7 +1042,7 @@ static void set_cr3(struct kvm_vcpu *vcp
inject_gp(vcpu);
return;
}
- if (is_paging() && is_pae() &&
+ if (is_paging() && is_pae(vcpu) &&
pdptrs_have_reserved_bits_set(vcpu, cr3)) {
printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
"reserved bits\n");
@@ -1902,7 +1903,7 @@ unsigned long realmode_get_cr(struct kvm
case 3:
return vcpu->cr3;
case 4:
- return guest_cr4();
+ return vcpu->cr4;
default:
vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
return 0;
@@ -1924,7 +1925,7 @@ void realmode_set_cr(struct kvm_vcpu *vc
set_cr3(vcpu, val);
break;
case 4:
- set_cr4(vcpu, mk_cr_64(guest_cr4(), val));
+ set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
break;
default:
vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
@@ -2844,7 +2845,7 @@ static int kvm_dev_ioctl_get_sregs(struc
sregs->cr0 = guest_cr0();
sregs->cr2 = vcpu->cr2;
sregs->cr3 = vcpu->cr3;
- sregs->cr4 = guest_cr4();
+ sregs->cr4 = vcpu->cr4;
sregs->cr8 = vcpu->cr8;
sregs->efer = vcpu->shadow_efer;
sregs->apic_base = vcpu->apic_base;
@@ -2912,7 +2913,7 @@ static int kvm_dev_ioctl_set_sregs(struc
vmcs_writel(GUEST_CR0,
(sregs->cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);

- mmu_reset_needed |= guest_cr4() != sregs->cr4;
+ mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
__set_cr4(vcpu, sregs->cr4);

if (mmu_reset_needed)
Index: linux-2.6/drivers/kvm/mmu.c
===================================================================
--- linux-2.6.orig/drivers/kvm/mmu.c
+++ linux-2.6/drivers/kvm/mmu.c
@@ -564,7 +564,7 @@ static int paging64_init_context(struct
{
struct kvm_mmu *context = &vcpu->mmu;

- ASSERT(is_pae());
+ ASSERT(is_pae(vcpu));
context->new_cr3 = paging_new_cr3;
context->page_fault = paging64_page_fault;
context->inval_page = paging_inval_page;
@@ -618,7 +618,7 @@ static int init_kvm_mmu(struct kvm_vcpu
return nonpaging_init_context(vcpu);
else if (is_long_mode())
return paging64_init_context(vcpu);
- else if (is_pae())
+ else if (is_pae(vcpu))
return paging32E_init_context(vcpu);
else
return paging32_init_context(vcpu);
Index: linux-2.6/drivers/kvm/paging_tmpl.h
===================================================================
--- linux-2.6.orig/drivers/kvm/paging_tmpl.h
+++ linux-2.6/drivers/kvm/paging_tmpl.h
@@ -70,7 +70,7 @@ static void FNAME(init_walker)(struct gu
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((!is_long_mode() && is_pae()) ||
+ ASSERT((!is_long_mode() && is_pae(vcpu)) ||
(vcpu->cr3 & ~(PAGE_MASK | CR3_FLAGS_MASK)) == 0);

walker->table = (pt_element_t *)( (unsigned long)walker->table |
@@ -133,7 +133,7 @@ static pt_element_t *FNAME(fetch_guest)(
!is_present_pte(walker->table[index]) ||
(walker->level == PT_DIRECTORY_LEVEL &&
(walker->table[index] & PT_PAGE_SIZE_MASK) &&
- (PTTYPE == 64 || is_pse())))
+ (PTTYPE == 64 || is_pse(vcpu))))
return &walker->table[index];
if (walker->level != 3 || is_long_mode())
walker->inherited_ar &= walker->table[index];
@@ -369,7 +369,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kv

if (walker.level == PT_DIRECTORY_LEVEL) {
ASSERT((guest_pte & PT_PAGE_SIZE_MASK));
- ASSERT(PTTYPE == 64 || is_pse());
+ ASSERT(PTTYPE == 64 || is_pse(vcpu));

gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr &
(PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | ~PAGE_MASK));
Index: linux-2.6/drivers/kvm/kvm_vmx.h
===================================================================
--- /dev/null
+++ linux-2.6/drivers/kvm/kvm_vmx.h
@@ -0,0 +1,20 @@
+#ifndef __KVM_VMX_H
+#define __KVM_VMX_H
+
+static inline void vmcs_write16(unsigned long field, u16 value)
+{
+ vmcs_writel(field, value);
+}
+
+static inline void vmcs_write64(unsigned long field, u64 value)
+{
+#ifdef __x86_64__
+ vmcs_writel(field, value);
+#else
+ vmcs_writel(field, value);
+ asm volatile ("");
+ vmcs_writel(field+1, value >> 32);
+#endif
+}
+
+#endif
-
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Next message: Avi Kivity: "[PATCH 10/38] KVM: Cache guest cr0 in vcpu structure"
Previous message: Oyvind Kristiansen: "Bug? Needed to use pci=assign-busses"
In reply to: Avi Kivity: "[PATCH 8/38] KVM: Make the segment accessors arch operations"
Next in thread: Avi Kivity: "[PATCH 10/38] KVM: Cache guest cr0 in vcpu structure"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]