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Message-Id: <20230511040857.6094-20-weijiang.yang@intel.com>
Date: Thu, 11 May 2023 00:08:55 -0400
From: Yang Weijiang <weijiang.yang@...el.com>
To: seanjc@...gle.com, pbonzini@...hat.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: peterz@...radead.org, rppt@...nel.org, binbin.wu@...ux.intel.com,
rick.p.edgecombe@...el.com, weijiang.yang@...el.com,
john.allen@....com,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH v3 19/21] KVM:nVMX: Enable user CET support for nested VMX
Add CET fields to vmcs12 and pass through CET user mode MSRs to
L2 if L1 can support. Enable nested VMCS control bits and CR4 CET
bit support.
Co-developed-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
arch/x86/kvm/vmx/nested.c | 12 ++++++++++--
arch/x86/kvm/vmx/vmcs12.c | 6 ++++++
arch/x86/kvm/vmx/vmcs12.h | 14 +++++++++++++-
arch/x86/kvm/vmx/vmx.c | 2 ++
4 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 7bc62cd72748..522ac27d2534 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -660,6 +660,13 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
MSR_IA32_FLUSH_CMD, MSR_TYPE_W);
+ /* Pass CET MSRs to nested VM if L0 and L1 are set to pass-through. */
+ nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
+ MSR_IA32_U_CET, MSR_TYPE_RW);
+
+ nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
+ MSR_IA32_PL3_SSP, MSR_TYPE_RW);
+
kvm_vcpu_unmap(vcpu, &vmx->nested.msr_bitmap_map, false);
vmx->nested.force_msr_bitmap_recalc = false;
@@ -6785,7 +6792,7 @@ static void nested_vmx_setup_exit_ctls(struct vmcs_config *vmcs_conf,
VM_EXIT_HOST_ADDR_SPACE_SIZE |
#endif
VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT |
- VM_EXIT_CLEAR_BNDCFGS;
+ VM_EXIT_CLEAR_BNDCFGS | VM_EXIT_LOAD_CET_STATE;
msrs->exit_ctls_high |=
VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
@@ -6807,7 +6814,8 @@ static void nested_vmx_setup_entry_ctls(struct vmcs_config *vmcs_conf,
#ifdef CONFIG_X86_64
VM_ENTRY_IA32E_MODE |
#endif
- VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS;
+ VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS |
+ VM_ENTRY_LOAD_CET_STATE;
msrs->entry_ctls_high |=
(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER |
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL);
diff --git a/arch/x86/kvm/vmx/vmcs12.c b/arch/x86/kvm/vmx/vmcs12.c
index 106a72c923ca..4233b5ca9461 100644
--- a/arch/x86/kvm/vmx/vmcs12.c
+++ b/arch/x86/kvm/vmx/vmcs12.c
@@ -139,6 +139,9 @@ const unsigned short vmcs12_field_offsets[] = {
FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
+ FIELD(GUEST_S_CET, guest_s_cet),
+ FIELD(GUEST_SSP, guest_ssp),
+ FIELD(GUEST_INTR_SSP_TABLE, guest_ssp_tbl),
FIELD(HOST_CR0, host_cr0),
FIELD(HOST_CR3, host_cr3),
FIELD(HOST_CR4, host_cr4),
@@ -151,5 +154,8 @@ const unsigned short vmcs12_field_offsets[] = {
FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
FIELD(HOST_RSP, host_rsp),
FIELD(HOST_RIP, host_rip),
+ FIELD(HOST_S_CET, host_s_cet),
+ FIELD(HOST_SSP, host_ssp),
+ FIELD(HOST_INTR_SSP_TABLE, host_ssp_tbl),
};
const unsigned int nr_vmcs12_fields = ARRAY_SIZE(vmcs12_field_offsets);
diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 01936013428b..3884489e7f7e 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -117,7 +117,13 @@ struct __packed vmcs12 {
natural_width host_ia32_sysenter_eip;
natural_width host_rsp;
natural_width host_rip;
- natural_width paddingl[8]; /* room for future expansion */
+ natural_width host_s_cet;
+ natural_width host_ssp;
+ natural_width host_ssp_tbl;
+ natural_width guest_s_cet;
+ natural_width guest_ssp;
+ natural_width guest_ssp_tbl;
+ natural_width paddingl[2]; /* room for future expansion */
u32 pin_based_vm_exec_control;
u32 cpu_based_vm_exec_control;
u32 exception_bitmap;
@@ -292,6 +298,12 @@ static inline void vmx_check_vmcs12_offsets(void)
CHECK_OFFSET(host_ia32_sysenter_eip, 656);
CHECK_OFFSET(host_rsp, 664);
CHECK_OFFSET(host_rip, 672);
+ CHECK_OFFSET(host_s_cet, 680);
+ CHECK_OFFSET(host_ssp, 688);
+ CHECK_OFFSET(host_ssp_tbl, 696);
+ CHECK_OFFSET(guest_s_cet, 704);
+ CHECK_OFFSET(guest_ssp, 712);
+ CHECK_OFFSET(guest_ssp_tbl, 720);
CHECK_OFFSET(pin_based_vm_exec_control, 744);
CHECK_OFFSET(cpu_based_vm_exec_control, 748);
CHECK_OFFSET(exception_bitmap, 752);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index cb5908433c09..a2494156902d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7645,6 +7645,8 @@ static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu)
cr4_fixed1_update(X86_CR4_PKE, ecx, feature_bit(PKU));
cr4_fixed1_update(X86_CR4_UMIP, ecx, feature_bit(UMIP));
cr4_fixed1_update(X86_CR4_LA57, ecx, feature_bit(LA57));
+ cr4_fixed1_update(X86_CR4_CET, ecx, feature_bit(SHSTK));
+ cr4_fixed1_update(X86_CR4_CET, edx, feature_bit(IBT));
#undef cr4_fixed1_update
}
--
2.27.0
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