KVM: x86: Drop vm_init_tsc
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>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 751a2d2..4fbab24 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2512,7 +2512,7 @@
{
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 @@
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;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4b4d283..8b0c51a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5495,8 +5495,6 @@
/* 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;
}