Commit 989e3992 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by Thomas Gleixner

x86/KVM/VMX: Extend add_atomic_switch_msr() to allow VMENTER only MSRs

The IA32_FLUSH_CMD MSR needs only to be written on VMENTER. Extend
add_atomic_switch_msr() with an entry_only parameter to allow storing the
MSR only in the guest (ENTRY) MSR array.
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 31907093
......@@ -2484,9 +2484,9 @@ 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)
u64 guest_val, u64 host_val, bool entry_only)
{
int i, j;
int i, j = 0;
struct msr_autoload *m = &vmx->msr_autoload;
switch (msr) {
......@@ -2522,7 +2522,9 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
}
i = find_msr(&m->guest, msr);
j = find_msr(&m->host, msr);
if (!entry_only)
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);
......@@ -2532,12 +2534,16 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
i = m->guest.nr++;
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr);
}
m->guest.val[i].index = msr;
m->guest.val[i].value = guest_val;
if (entry_only)
return;
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[j].index = msr;
m->host.val[j].value = host_val;
}
......@@ -2583,7 +2589,7 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
guest_efer &= ~EFER_LME;
if (guest_efer != host_efer)
add_atomic_switch_msr(vmx, MSR_EFER,
guest_efer, host_efer);
guest_efer, host_efer, false);
return false;
} else {
guest_efer &= ~ignore_bits;
......@@ -4037,7 +4043,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
vcpu->arch.ia32_xss = data;
if (vcpu->arch.ia32_xss != host_xss)
add_atomic_switch_msr(vmx, MSR_IA32_XSS,
vcpu->arch.ia32_xss, host_xss);
vcpu->arch.ia32_xss, host_xss, false);
else
clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
break;
......@@ -10040,7 +10046,7 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
clear_atomic_switch_msr(vmx, msrs[i].msr);
else
add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
msrs[i].host);
msrs[i].host, false);
}
static void vmx_arm_hv_timer(struct kvm_vcpu *vcpu)
......
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