lkml.org 
[lkml]   [2018]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 4.18 059/100] KVM: nVMX: Fix emulation of VM_ENTRY_LOAD_BNDCFGS
Date
From: Liran Alon <liran.alon@oracle.com>

[ Upstream commit 62cf9bd8118c4009f02c477ef78c723f49e53e16 ]

L2 IA32_BNDCFGS should be updated with vmcs12->guest_bndcfgs only
when VM_ENTRY_LOAD_BNDCFGS is specified in vmcs12->vm_entry_controls.

Otherwise, L2 IA32_BNDCFGS should be set to vmcs01->guest_bndcfgs which
is L1 IA32_BNDCFGS.

Reviewed-by: Nikita Leshchenko <nikita.leshchenko@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/vmx.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2e23fce5eb1f..9efe130ea2e6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -819,6 +819,7 @@ struct nested_vmx {

/* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
u64 vmcs01_debugctl;
+ u64 vmcs01_guest_bndcfgs;

u16 vpid02;
u16 last_vpid;
@@ -11567,8 +11568,13 @@ static void prepare_vmcs02_full(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)

set_cr4_guest_host_mask(vmx);

- if (kvm_mpx_supported())
- vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
+ if (kvm_mpx_supported()) {
+ if (vmx->nested.nested_run_pending &&
+ (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
+ vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
+ else
+ vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs);
+ }

if (enable_vpid) {
if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02)
@@ -12082,6 +12088,9 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu)

if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
+ if (kvm_mpx_supported() &&
+ !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
+ vmx->nested.vmcs01_guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);

vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02);
vmx_segment_cache_clear(vmx);
--
2.17.1
\
 
 \ /
  Last update: 2018-10-16 06:56    [W:0.239 / U:32.552 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site