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-rw-r--r--arch/x86/kvm/Makefile2
-rw-r--r--arch/x86/kvm/vmx/nested.c30
-rw-r--r--arch/x86/kvm/vmx/vmenter.S57
-rw-r--r--arch/x86/kvm/vmx/vmx.c22
-rw-r--r--arch/x86/kvm/vmx/vmx.h1
5 files changed, 78 insertions, 34 deletions
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 83dc7d6a0294..69b3a7c30013 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -16,7 +16,7 @@ kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
hyperv.o page_track.o debugfs.o
-kvm-intel-y += vmx/vmx.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
+kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
kvm-amd-y += svm.o pmu_amd.o
obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index da16f022a529..abbad93ed26a 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -19,8 +19,6 @@ module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
static bool __read_mostly nested_early_check = 0;
module_param(nested_early_check, bool, S_IRUGO);
-extern const ulong vmx_early_consistency_check_return;
-
/*
* Hyper-V requires all of these, so mark them as supported even though
* they are just treated the same as all-context.
@@ -2715,7 +2713,7 @@ static int nested_vmx_check_vmentry_postreqs(struct kvm_vcpu *vcpu,
return 0;
}
-static int __noclone nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
+static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long cr3, cr4;
@@ -2740,8 +2738,6 @@ static int __noclone nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
*/
vmcs_writel(GUEST_RFLAGS, 0);
- vmcs_writel(HOST_RIP, vmx_early_consistency_check_return);
-
cr3 = __get_current_cr3_fast();
if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) {
vmcs_writel(HOST_CR3, cr3);
@@ -2758,33 +2754,27 @@ static int __noclone nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
asm(
/* Set HOST_RSP */
+ "sub $%c[wordsize], %%" _ASM_SP "\n\t" /* temporarily adjust RSP for CALL */
__ex("vmwrite %%" _ASM_SP ", %%" _ASM_DX) "\n\t"
- "mov %%" _ASM_SP ", %c[host_rsp](%% " _ASM_CX")\n\t"
+ "mov %%" _ASM_SP ", %c[host_rsp](%1)\n\t"
+ "add $%c[wordsize], %%" _ASM_SP "\n\t" /* un-adjust RSP */
/* Check if vmlaunch or vmresume is needed */
"cmpl $0, %c[launched](%% " _ASM_CX")\n\t"
- "jne 1f\n\t"
- __ex("vmlaunch") "\n\t"
- "jmp 2f\n\t"
- "1: " __ex("vmresume") "\n\t"
- "2: "
+
+ "call vmx_vmenter\n\t"
+
/* Set vmx->fail accordingly */
"setbe %c[fail](%% " _ASM_CX")\n\t"
-
- ".pushsection .rodata\n\t"
- ".global vmx_early_consistency_check_return\n\t"
- "vmx_early_consistency_check_return: " _ASM_PTR " 2b\n\t"
- ".popsection"
- :
+ : ASM_CALL_CONSTRAINT
: "c"(vmx), "d"((unsigned long)HOST_RSP),
[launched]"i"(offsetof(struct vcpu_vmx, __launched)),
[fail]"i"(offsetof(struct vcpu_vmx, fail)),
- [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp))
+ [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
+ [wordsize]"i"(sizeof(ulong))
: "rax", "cc", "memory"
);
- vmcs_writel(HOST_RIP, vmx_return);
-
preempt_enable();
if (vmx->msr_autoload.host.nr)
diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
new file mode 100644
index 000000000000..bcef2c7e9bc4
--- /dev/null
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+ .text
+
+/**
+ * vmx_vmenter - VM-Enter the current loaded VMCS
+ *
+ * %RFLAGS.ZF: !VMCS.LAUNCHED, i.e. controls VMLAUNCH vs. VMRESUME
+ *
+ * Returns:
+ * %RFLAGS.CF is set on VM-Fail Invalid
+ * %RFLAGS.ZF is set on VM-Fail Valid
+ * %RFLAGS.{CF,ZF} are cleared on VM-Success, i.e. VM-Exit
+ *
+ * Note that VMRESUME/VMLAUNCH fall-through and return directly if
+ * they VM-Fail, whereas a successful VM-Enter + VM-Exit will jump
+ * to vmx_vmexit.
+ */
+ENTRY(vmx_vmenter)
+ /* EFLAGS.ZF is set if VMCS.LAUNCHED == 0 */
+ je 2f
+
+1: vmresume
+ ret
+
+2: vmlaunch
+ ret
+
+3: cmpb $0, kvm_rebooting
+ jne 4f
+ call kvm_spurious_fault
+4: ret
+
+ .pushsection .fixup, "ax"
+5: jmp 3b
+ .popsection
+
+ _ASM_EXTABLE(1b, 5b)
+ _ASM_EXTABLE(2b, 5b)
+
+ENDPROC(vmx_vmenter)
+
+/**
+ * vmx_vmexit - Handle a VMX VM-Exit
+ *
+ * Returns:
+ * %RFLAGS.{CF,ZF} are cleared on VM-Success, i.e. VM-Exit
+ *
+ * This is vmx_vmenter's partner in crime. On a VM-Exit, control will jump
+ * here after hardware loads the host's state, i.e. this is the destination
+ * referred to by VMCS.HOST_RIP.
+ */
+ENTRY(vmx_vmexit)
+ ret
+ENDPROC(vmx_vmexit)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e82319fbdceb..41d6f7081ff7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -336,6 +336,8 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var);
static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
u32 msr, int type);
+void vmx_vmexit(void);
+
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
DEFINE_PER_CPU(struct vmcs *, current_vmcs);
/*
@@ -3773,7 +3775,7 @@ void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */
vmx->host_idt_base = dt.address;
- vmcs_writel(HOST_RIP, vmx_return); /* 22.2.5 */
+ vmcs_writel(HOST_RIP, (unsigned long)vmx_vmexit); /* 22.2.5 */
rdmsr(MSR_IA32_SYSENTER_CS, low32, high32);
vmcs_write32(HOST_IA32_SYSENTER_CS, low32);
@@ -6360,7 +6362,7 @@ static void vmx_update_hv_timer(struct kvm_vcpu *vcpu)
vmx->loaded_vmcs->hv_timer_armed = false;
}
-static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
+static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long cr3, cr4, evmcs_rsp;
@@ -6440,6 +6442,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
"push %%" _ASM_DX "; push %%" _ASM_BP ";"
"push %%" _ASM_CX " \n\t" /* placeholder for guest rcx */
"push %%" _ASM_CX " \n\t"
+ "sub $%c[wordsize], %%" _ASM_SP "\n\t" /* temporarily adjust RSP for CALL */
"cmp %%" _ASM_SP ", %c[host_rsp](%%" _ASM_CX ") \n\t"
"je 1f \n\t"
"mov %%" _ASM_SP ", %c[host_rsp](%%" _ASM_CX ") \n\t"
@@ -6451,6 +6454,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
"2: \n\t"
__ex("vmwrite %%" _ASM_SP ", %%" _ASM_DX) "\n\t"
"1: \n\t"
+ "add $%c[wordsize], %%" _ASM_SP "\n\t" /* un-adjust RSP */
+
/* Reload cr2 if changed */
"mov %c[cr2](%%" _ASM_CX "), %%" _ASM_AX " \n\t"
"mov %%cr2, %%" _ASM_DX " \n\t"
@@ -6481,11 +6486,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
"mov %c[rcx](%%" _ASM_CX "), %%" _ASM_CX " \n\t"
/* Enter guest mode */
- "jne 1f \n\t"
- __ex("vmlaunch") "\n\t"
- "jmp 2f \n\t"
- "1: " __ex("vmresume") "\n\t"
- "2: "
+ "call vmx_vmenter\n\t"
/* Save guest's RCX to the stack placeholder (see above) */
"mov %%" _ASM_CX ", %c[wordsize](%%" _ASM_SP ") \n\t"
@@ -6534,11 +6535,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
"xor %%esi, %%esi \n\t"
"xor %%edi, %%edi \n\t"
"pop %%" _ASM_BP "; pop %%" _ASM_DX " \n\t"
- ".pushsection .rodata \n\t"
- ".global vmx_return \n\t"
- "vmx_return: " _ASM_PTR " 2b \n\t"
- ".popsection"
- : : "c"(vmx), "d"((unsigned long)HOST_RSP), "S"(evmcs_rsp),
+ : ASM_CALL_CONSTRAINT
+ : "c"(vmx), "d"((unsigned long)HOST_RSP), "S"(evmcs_rsp),
[launched]"i"(offsetof(struct vcpu_vmx, __launched)),
[fail]"i"(offsetof(struct vcpu_vmx, fail)),
[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 20172c11d5f8..99328954c2fc 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -12,7 +12,6 @@
#include "vmcs.h"
extern const u32 vmx_msr_index[];
-extern const ulong vmx_return;
extern u64 host_efer;
#define MSR_TYPE_R 1
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-30 14:33:07 +0000