summaryrefslogtreecommitdiff
path: root/arch/x86/kvm
diff options
context:
space:
mode:
authorWanpeng Li <wanpeng.li@hotmail.com>2017-10-11 15:10:19 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2017-10-12 15:01:54 +0300
commita554d207dc46b205dcd707888ba31b13c7cfc009 (patch)
treed3ca7a16f7e8e0e9e22567657580b832e90dadfa /arch/x86/kvm
parent44275932589a84a24849290b0d5c22157016a5e6 (diff)
downloadlinux-a554d207dc46b205dcd707888ba31b13c7cfc009.tar.xz
KVM: X86: Processor States following Reset or INIT
- XCR0 is reset to 1 by RESET but not INIT - XSS is zeroed by both RESET and INIT - BNDCFGU, BND0-BND3, BNDCFGS, BNDSTATUS are zeroed by both RESET and INIT This patch does this according to SDM. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Jim Mattson <jmattson@google.com> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/vmx.c2
-rw-r--r--arch/x86/kvm/x86.c22
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ffea07ede222..cbd7afa53bd0 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5581,6 +5581,8 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, 0);
+ if (kvm_mpx_supported())
+ vmcs_write64(GUEST_BNDCFGS, 0);
setup_msrs(vmx);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b0d291518e88..4ac261000e7e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7804,18 +7804,40 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
kvm_async_pf_hash_reset(vcpu);
vcpu->arch.apf.halted = false;
+ if (kvm_mpx_supported()) {
+ void *mpx_state_buffer;
+
+ /*
+ * To avoid have the INIT path from kvm_apic_has_events() that be
+ * called with loaded FPU and does not let userspace fix the state.
+ */
+ kvm_put_guest_fpu(vcpu);
+ mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave,
+ XFEATURE_MASK_BNDREGS);
+ if (mpx_state_buffer)
+ memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state));
+ mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave,
+ XFEATURE_MASK_BNDCSR);
+ if (mpx_state_buffer)
+ memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr));
+ }
+
if (!init_event) {
kvm_pmu_reset(vcpu);
vcpu->arch.smbase = 0x30000;
vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
vcpu->arch.msr_misc_features_enables = 0;
+
+ vcpu->arch.xcr0 = XFEATURE_MASK_FP;
}
memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
vcpu->arch.regs_avail = ~0;
vcpu->arch.regs_dirty = ~0;
+ vcpu->arch.ia32_xss = 0;
+
kvm_x86_ops->vcpu_reset(vcpu, init_event);
}