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x86/KVM/VMX: Separate the VMX AUTOLOAD guest/host number accounting 

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>
This commit is contained in:
Konrad Rzeszutek Wilk 2018-06-20 22:00:47 -04:00 committed by Thomas Gleixner
parent ca83b4a7f2
commit 3190709335
1 changed files with 19 additions and 10 deletions
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29
arch/x86/kvm/vmx.c
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@ -2457,12 +2457,18 @@ static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
}
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);
}
@ -2480,7 +2486,7 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
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) {
@ -2516,21 +2522,24 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
}
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)