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KVM: Remove set_cr0_no_modeswitch() arch op 

set_cr0_no_modeswitch() was a hack to avoid corrupting segment registers.
As we now cache the protected mode values on entry to real mode, this
isn't an issue anymore, and it interferes with reboot (which usually _is_
a modeswitch).

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-03-20 18:44:51 +02:00
parent 8cb5b03332
commit f6528b03f1
4 changed files with 1 additions and 21 deletions
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2
drivers/kvm/kvm.h
View File

@ -383,8 +383,6 @@ struct kvm_arch_ops {
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
unsigned long cr0);
void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);

2
drivers/kvm/kvm_main.c
View File

@ -1936,7 +1936,7 @@ static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
kvm_arch_ops->set_cr4(vcpu, sregs->cr4);

1
drivers/kvm/svm.c
View File

@ -1716,7 +1716,6 @@ static struct kvm_arch_ops svm_arch_ops = {
.get_cs_db_l_bits = svm_get_cs_db_l_bits,
.decache_cr0_cr4_guest_bits = svm_decache_cr0_cr4_guest_bits,
.set_cr0 = svm_set_cr0,
.set_cr0_no_modeswitch = svm_set_cr0,
.set_cr3 = svm_set_cr3,
.set_cr4 = svm_set_cr4,
.set_efer = svm_set_efer,

17
drivers/kvm/vmx.c
View File

@ -788,22 +788,6 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
vcpu->cr0 = cr0;
}
/*
* Used when restoring the VM to avoid corrupting segment registers
*/
static void vmx_set_cr0_no_modeswitch(struct kvm_vcpu *vcpu, unsigned long cr0)
{
if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
enter_rmode(vcpu);
vcpu->rmode.active = ((cr0 & CR0_PE_MASK) == 0);
update_exception_bitmap(vcpu);
vmcs_writel(CR0_READ_SHADOW, cr0);
vmcs_writel(GUEST_CR0,
(cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
vcpu->cr0 = cr0;
}
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
vmcs_writel(GUEST_CR3, cr3);
@ -2069,7 +2053,6 @@ static struct kvm_arch_ops vmx_arch_ops = {
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
.decache_cr0_cr4_guest_bits = vmx_decache_cr0_cr4_guest_bits,
.set_cr0 = vmx_set_cr0,
.set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch,
.set_cr3 = vmx_set_cr3,
.set_cr4 = vmx_set_cr4,
#ifdef CONFIG_X86_64