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Message-Id: <0488bcfdb5e7660216281626ccedff1128ba2a58.1673539699.git.isaku.yamahata@intel.com>
Date: Thu, 12 Jan 2023 08:32:30 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
Sean Christopherson <seanjc@...gle.com>,
Sagi Shahar <sagis@...gle.com>,
David Matlack <dmatlack@...gle.com>,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH v11 082/113] KVM: VMX: Move NMI/exception handler to common helper
From: Sean Christopherson <sean.j.christopherson@...el.com>
TDX mostly handles NMI/exception exit mostly the same to VMX case. The
difference is how to retrieve exit qualification. To share the code with
TDX, move NMI/exception to a common header, common.h.
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
arch/x86/kvm/vmx/common.h | 70 ++++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/vmx.c | 79 ++++-----------------------------------
2 files changed, 78 insertions(+), 71 deletions(-)
diff --git a/arch/x86/kvm/vmx/common.h b/arch/x86/kvm/vmx/common.h
index 747f993cf7de..65abda49debe 100644
--- a/arch/x86/kvm/vmx/common.h
+++ b/arch/x86/kvm/vmx/common.h
@@ -4,8 +4,78 @@
#include <linux/kvm_host.h>
+#include <asm/traps.h>
+
#include "posted_intr.h"
#include "mmu.h"
+#include "vmcs.h"
+#include "x86.h"
+
+extern unsigned long vmx_host_idt_base;
+void vmx_do_interrupt_nmi_irqoff(unsigned long entry);
+
+static inline void vmx_handle_interrupt_nmi_irqoff(struct kvm_vcpu *vcpu,
+ unsigned long entry)
+{
+ bool is_nmi = entry == (unsigned long)asm_exc_nmi_noist;
+
+ kvm_before_interrupt(vcpu, is_nmi ? KVM_HANDLING_NMI : KVM_HANDLING_IRQ);
+ vmx_do_interrupt_nmi_irqoff(entry);
+ kvm_after_interrupt(vcpu);
+}
+
+static inline void vmx_handle_nm_fault_irqoff(struct kvm_vcpu *vcpu)
+{
+ /*
+ * Save xfd_err to guest_fpu before interrupt is enabled, so the
+ * MSR value is not clobbered by the host activity before the guest
+ * has chance to consume it.
+ *
+ * Do not blindly read xfd_err here, since this exception might
+ * be caused by L1 interception on a platform which doesn't
+ * support xfd at all.
+ *
+ * Do it conditionally upon guest_fpu::xfd. xfd_err matters
+ * only when xfd contains a non-zero value.
+ *
+ * Queuing exception is done in vmx_handle_exit. See comment there.
+ */
+ if (vcpu->arch.guest_fpu.fpstate->xfd)
+ rdmsrl(MSR_IA32_XFD_ERR, vcpu->arch.guest_fpu.xfd_err);
+}
+
+static inline void vmx_handle_exception_nmi_irqoff(struct kvm_vcpu *vcpu,
+ u32 intr_info)
+{
+ const unsigned long nmi_entry = (unsigned long)asm_exc_nmi_noist;
+
+ /* if exit due to PF check for async PF */
+ if (is_page_fault(intr_info))
+ vcpu->arch.apf.host_apf_flags = kvm_read_and_reset_apf_flags();
+ /* if exit due to NM, handle before interrupts are enabled */
+ else if (is_nm_fault(intr_info))
+ vmx_handle_nm_fault_irqoff(vcpu);
+ /* Handle machine checks before interrupts are enabled */
+ else if (is_machine_check(intr_info))
+ kvm_machine_check();
+ /* We need to handle NMIs before interrupts are enabled */
+ else if (is_nmi(intr_info))
+ vmx_handle_interrupt_nmi_irqoff(vcpu, nmi_entry);
+}
+
+static inline void vmx_handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
+ u32 intr_info)
+{
+ unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
+ gate_desc *desc = (gate_desc *)vmx_host_idt_base + vector;
+
+ if (KVM_BUG(!is_external_intr(intr_info), vcpu->kvm,
+ "unexpected VM-Exit interrupt info: 0x%x", intr_info))
+ return;
+
+ vmx_handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc));
+ vcpu->arch.at_instruction_boundary = true;
+}
static inline int __vmx_handle_ept_violation(struct kvm_vcpu *vcpu, gpa_t gpa,
unsigned long exit_qualification)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 63cff4d02211..7c8522628dd3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -526,7 +526,7 @@ static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
vmx->segment_cache.bitmask = 0;
}
-static unsigned long host_idt_base;
+unsigned long vmx_host_idt_base;
#if IS_ENABLED(CONFIG_HYPERV)
static bool __read_mostly enlightened_vmcs = true;
@@ -4318,7 +4318,7 @@ void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
- vmcs_writel(HOST_IDTR_BASE, host_idt_base); /* 22.2.4 */
+ vmcs_writel(HOST_IDTR_BASE, vmx_host_idt_base); /* 22.2.4 */
vmcs_writel(HOST_RIP, (unsigned long)vmx_vmexit); /* 22.2.5 */
@@ -5209,10 +5209,10 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
intr_info = vmx_get_intr_info(vcpu);
if (is_machine_check(intr_info) || is_nmi(intr_info))
- return 1; /* handled by handle_exception_nmi_irqoff() */
+ return 1; /* handled by vmx_handle_exception_nmi_irqoff() */
/*
- * Queue the exception here instead of in handle_nm_fault_irqoff().
+ * Queue the exception here instead of in vmx_handle_nm_fault_irqoff().
* This ensures the nested_vmx check is not skipped so vmexit can
* be reflected to L1 (when it intercepts #NM) before reaching this
* point.
@@ -6887,70 +6887,6 @@ void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
}
-void vmx_do_interrupt_nmi_irqoff(unsigned long entry);
-
-static void handle_interrupt_nmi_irqoff(struct kvm_vcpu *vcpu,
- unsigned long entry)
-{
- bool is_nmi = entry == (unsigned long)asm_exc_nmi_noist;
-
- kvm_before_interrupt(vcpu, is_nmi ? KVM_HANDLING_NMI : KVM_HANDLING_IRQ);
- vmx_do_interrupt_nmi_irqoff(entry);
- kvm_after_interrupt(vcpu);
-}
-
-static void handle_nm_fault_irqoff(struct kvm_vcpu *vcpu)
-{
- /*
- * Save xfd_err to guest_fpu before interrupt is enabled, so the
- * MSR value is not clobbered by the host activity before the guest
- * has chance to consume it.
- *
- * Do not blindly read xfd_err here, since this exception might
- * be caused by L1 interception on a platform which doesn't
- * support xfd at all.
- *
- * Do it conditionally upon guest_fpu::xfd. xfd_err matters
- * only when xfd contains a non-zero value.
- *
- * Queuing exception is done in vmx_handle_exit. See comment there.
- */
- if (vcpu->arch.guest_fpu.fpstate->xfd)
- rdmsrl(MSR_IA32_XFD_ERR, vcpu->arch.guest_fpu.xfd_err);
-}
-
-static void handle_exception_nmi_irqoff(struct kvm_vcpu *vcpu, u32 intr_info)
-{
- const unsigned long nmi_entry = (unsigned long)asm_exc_nmi_noist;
-
- /* if exit due to PF check for async PF */
- if (is_page_fault(intr_info))
- vcpu->arch.apf.host_apf_flags = kvm_read_and_reset_apf_flags();
- /* if exit due to NM, handle before interrupts are enabled */
- else if (is_nm_fault(intr_info))
- handle_nm_fault_irqoff(vcpu);
- /* Handle machine checks before interrupts are enabled */
- else if (is_machine_check(intr_info))
- kvm_machine_check();
- /* We need to handle NMIs before interrupts are enabled */
- else if (is_nmi(intr_info))
- handle_interrupt_nmi_irqoff(vcpu, nmi_entry);
-}
-
-static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
- u32 intr_info)
-{
- unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
- gate_desc *desc = (gate_desc *)host_idt_base + vector;
-
- if (KVM_BUG(!is_external_intr(intr_info), vcpu->kvm,
- "unexpected VM-Exit interrupt info: 0x%x", intr_info))
- return;
-
- handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc));
- vcpu->arch.at_instruction_boundary = true;
-}
-
void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -6959,9 +6895,10 @@ void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu)
return;
if (vmx->exit_reason.basic == EXIT_REASON_EXTERNAL_INTERRUPT)
- handle_external_interrupt_irqoff(vcpu, vmx_get_intr_info(vcpu));
+ vmx_handle_external_interrupt_irqoff(vcpu,
+ vmx_get_intr_info(vcpu));
else if (vmx->exit_reason.basic == EXIT_REASON_EXCEPTION_NMI)
- handle_exception_nmi_irqoff(vcpu, vmx_get_intr_info(vcpu));
+ vmx_handle_exception_nmi_irqoff(vcpu, vmx_get_intr_info(vcpu));
}
/*
@@ -8253,7 +8190,7 @@ __init int vmx_hardware_setup(void)
int r;
store_idt(&dt);
- host_idt_base = dt.address;
+ vmx_host_idt_base = dt.address;
vmx_setup_user_return_msrs();
--
2.25.1
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