x86/KVM/VMX: Separate the VMX AUTOLOAD guest/host number accounting
commit 3190709335dd31fe1aeeebfe4ffb6c7624ef971f upstream.
This allows to load a different number of MSRs depending on the context:
VMEXIT or VMENTER.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 39bc807..5e908d7 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2468,12 +2468,18 @@
}
i = find_msr(&m->guest, msr);
if (i < 0)
- return;
+ goto skip_guest;
--m->guest.nr;
- --m->host.nr;
m->guest.val[i] = m->guest.val[m->guest.nr];
- m->host.val[i] = m->host.val[m->host.nr];
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr);
+
+skip_guest:
+ i = find_msr(&m->host, msr);
+ if (i < 0)
+ return;
+
+ --m->host.nr;
+ m->host.val[i] = m->host.val[m->host.nr];
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr);
}
@@ -2491,7 +2497,7 @@
static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
u64 guest_val, u64 host_val)
{
- int i;
+ int i, j;
struct msr_autoload *m = &vmx->msr_autoload;
switch (msr) {
@@ -2527,21 +2533,24 @@
}
i = find_msr(&m->guest, msr);
- if (i == NR_AUTOLOAD_MSRS) {
+ j = find_msr(&m->host, msr);
+ if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) {
printk_once(KERN_WARNING "Not enough msr switch entries. "
"Can't add msr %x\n", msr);
return;
- } else if (i < 0) {
+ }
+ if (i < 0) {
i = m->guest.nr++;
- ++m->host.nr;
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr);
+ }
+ if (j < 0) {
+ j = m->host.nr++;
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr);
}
-
m->guest.val[i].index = msr;
m->guest.val[i].value = guest_val;
- m->host.val[i].index = msr;
- m->host.val[i].value = host_val;
+ m->host.val[j].index = msr;
+ m->host.val[j].value = host_val;
}
static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
