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KVM: x86: Drop vm_init_tsc

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This is used only by the VMX code, and is not done properly;
if the TSC is indeed backwards, it is out of sync, and will
need proper handling in the logic at each and every CPU change.
For now, drop this test during init as misguided.

Signed-off-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Zachary Amsden 2010-08-19 22:07:15 -10:00 committed by Avi Kivity
parent 45bf21a8ce
commit ae38436b78
3 changed files with 3 additions and 10 deletions
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1
arch/x86/include/asm/kvm_host.h
View file

@ -394,7 +394,6 @@ struct kvm_arch {
gpa_t ept_identity_map_addr;
unsigned long irq_sources_bitmap;
u64 vm_init_tsc;
s64 kvmclock_offset;
struct kvm_xen_hvm_config xen_hvm_config;

10
arch/x86/kvm/vmx.c
View file

@ -2512,7 +2512,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
{
u32 host_sysenter_cs, msr_low, msr_high;
u32 junk;
u64 host_pat, tsc_this, tsc_base;
u64 host_pat, tsc_this;
unsigned long a;
struct desc_ptr dt;
int i;
@ -2653,12 +2653,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
rdtscll(tsc_this);
if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
tsc_base = tsc_this;
guest_write_tsc(0, tsc_base);
tsc_this = native_read_tsc();
guest_write_tsc(0, tsc_this);
return 0;
}

2
arch/x86/kvm/x86.c
View file

@ -5495,8 +5495,6 @@ struct kvm *kvm_arch_create_vm(void)
/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
rdtscll(kvm->arch.vm_init_tsc);
return kvm;
}