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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2018-06-20 22:01:22 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-15 18:14:48 +0200
commitc45ff817e91bef4cbb36944b0c723a42c4c920d2 (patch)
tree54d19d34020b2d65c30e1e8bbd44c65ae172b514 /arch
parent5d3eaa2d3935e9a5be2dd7186962e72e475d5966 (diff)
x86/KVM/VMX: Extend add_atomic_switch_msr() to allow VMENTER only MSRs
commit 989e3992d2eca32c3f1404f2bc91acda3aa122d8 upstream 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e4ccb931ab40..e868c06939cd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2038,9 +2038,9 @@ 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) {
@@ -2076,7 +2076,9 @@ 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);
@@ -2086,12 +2088,16 @@ 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;
}
@@ -2150,7 +2156,7 @@ 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;
@@ -3314,7 +3320,7 @@ 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;
@@ -8985,7 +8991,7 @@ 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);
}
void vmx_arm_hv_timer(struct kvm_vcpu *vcpu)