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-rw-r--r--arch/x86/include/asm/hyperv-tlfs.h17
-rw-r--r--arch/x86/include/asm/mshyperv.h78
-rw-r--r--arch/x86/kernel/cpu/mshyperv.c72
3 files changed, 137 insertions, 30 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 08e822bd7aa6..566ac26239ba 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -116,6 +116,9 @@
/* Recommend using the newer ExProcessorMasks interface */
#define HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED BIT(11)
+/* Indicates that the hypervisor is nested within a Hyper-V partition. */
+#define HV_X64_HYPERV_NESTED BIT(12)
+
/* Recommend using enlightened VMCS */
#define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED BIT(14)
@@ -225,6 +228,17 @@ enum hv_isolation_type {
#define HV_REGISTER_SINT15 0x4000009F
/*
+ * Define synthetic interrupt controller model specific registers for
+ * nested hypervisor.
+ */
+#define HV_REGISTER_NESTED_SCONTROL 0x40001080
+#define HV_REGISTER_NESTED_SVERSION 0x40001081
+#define HV_REGISTER_NESTED_SIEFP 0x40001082
+#define HV_REGISTER_NESTED_SIMP 0x40001083
+#define HV_REGISTER_NESTED_EOM 0x40001084
+#define HV_REGISTER_NESTED_SINT0 0x40001090
+
+/*
* Synthetic Timer MSRs. Four timers per vcpu.
*/
#define HV_REGISTER_STIMER0_CONFIG 0x400000B0
@@ -368,7 +382,8 @@ struct hv_nested_enlightenments_control {
__u32 reserved:31;
} features;
struct {
- __u32 reserved;
+ __u32 inter_partition_comm:1;
+ __u32 reserved:31;
} hypercallControls;
} __packed;
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 6d502f3efb0f..4c4c0ec3b62e 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -72,10 +72,16 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
return hv_status;
}
+/* Hypercall to the L0 hypervisor */
+static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
+{
+ return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
+}
+
/* Fast hypercall with 8 bytes of input and no output */
-static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
+static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
{
- u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
+ u64 hv_status;
#ifdef CONFIG_X86_64
{
@@ -103,10 +109,24 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
return hv_status;
}
+static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
+
+ return _hv_do_fast_hypercall8(control, input1);
+}
+
+static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
+
+ return _hv_do_fast_hypercall8(control, input1);
+}
+
/* Fast hypercall with 16 bytes of input */
-static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
+static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
{
- u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
+ u64 hv_status;
#ifdef CONFIG_X86_64
{
@@ -137,6 +157,20 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
return hv_status;
}
+static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
+
+ return _hv_do_fast_hypercall16(control, input1, input2);
+}
+
+static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
+
+ return _hv_do_fast_hypercall16(control, input1, input2);
+}
+
extern struct hv_vp_assist_page **hv_vp_assist_page;
static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
@@ -190,36 +224,20 @@ extern bool hv_isolation_type_snp(void);
static inline bool hv_is_synic_reg(unsigned int reg)
{
- if ((reg >= HV_REGISTER_SCONTROL) &&
- (reg <= HV_REGISTER_SINT15))
- return true;
- return false;
+ return (reg >= HV_REGISTER_SCONTROL) &&
+ (reg <= HV_REGISTER_SINT15);
}
-static inline u64 hv_get_register(unsigned int reg)
+static inline bool hv_is_sint_reg(unsigned int reg)
{
- u64 value;
-
- if (hv_is_synic_reg(reg) && hv_isolation_type_snp())
- hv_ghcb_msr_read(reg, &value);
- else
- rdmsrl(reg, value);
- return value;
+ return (reg >= HV_REGISTER_SINT0) &&
+ (reg <= HV_REGISTER_SINT15);
}
-static inline void hv_set_register(unsigned int reg, u64 value)
-{
- if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) {
- hv_ghcb_msr_write(reg, value);
-
- /* Write proxy bit via wrmsl instruction */
- if (reg >= HV_REGISTER_SINT0 &&
- reg <= HV_REGISTER_SINT15)
- wrmsrl(reg, value | 1 << 20);
- } else {
- wrmsrl(reg, value);
- }
-}
+u64 hv_get_register(unsigned int reg);
+void hv_set_register(unsigned int reg, u64 value);
+u64 hv_get_non_nested_register(unsigned int reg);
+void hv_set_non_nested_register(unsigned int reg, u64 value);
#else /* CONFIG_HYPERV */
static inline void hyperv_init(void) {}
@@ -239,6 +257,8 @@ static inline int hyperv_flush_guest_mapping_range(u64 as,
}
static inline void hv_set_register(unsigned int reg, u64 value) { }
static inline u64 hv_get_register(unsigned int reg) { return 0; }
+static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
+static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages,
bool visible)
{
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 46668e255421..f924a76c6923 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -37,9 +37,76 @@
/* Is Linux running as the root partition? */
bool hv_root_partition;
+/* Is Linux running on nested Microsoft Hypervisor */
+bool hv_nested;
struct ms_hyperv_info ms_hyperv;
#if IS_ENABLED(CONFIG_HYPERV)
+static inline unsigned int hv_get_nested_reg(unsigned int reg)
+{
+ if (hv_is_sint_reg(reg))
+ return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
+
+ switch (reg) {
+ case HV_REGISTER_SIMP:
+ return HV_REGISTER_NESTED_SIMP;
+ case HV_REGISTER_SIEFP:
+ return HV_REGISTER_NESTED_SIEFP;
+ case HV_REGISTER_SVERSION:
+ return HV_REGISTER_NESTED_SVERSION;
+ case HV_REGISTER_SCONTROL:
+ return HV_REGISTER_NESTED_SCONTROL;
+ case HV_REGISTER_EOM:
+ return HV_REGISTER_NESTED_EOM;
+ default:
+ return reg;
+ }
+}
+
+u64 hv_get_non_nested_register(unsigned int reg)
+{
+ u64 value;
+
+ if (hv_is_synic_reg(reg) && hv_isolation_type_snp())
+ hv_ghcb_msr_read(reg, &value);
+ else
+ rdmsrl(reg, value);
+ return value;
+}
+EXPORT_SYMBOL_GPL(hv_get_non_nested_register);
+
+void hv_set_non_nested_register(unsigned int reg, u64 value)
+{
+ if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) {
+ hv_ghcb_msr_write(reg, value);
+
+ /* Write proxy bit via wrmsl instruction */
+ if (hv_is_sint_reg(reg))
+ wrmsrl(reg, value | 1 << 20);
+ } else {
+ wrmsrl(reg, value);
+ }
+}
+EXPORT_SYMBOL_GPL(hv_set_non_nested_register);
+
+u64 hv_get_register(unsigned int reg)
+{
+ if (hv_nested)
+ reg = hv_get_nested_reg(reg);
+
+ return hv_get_non_nested_register(reg);
+}
+EXPORT_SYMBOL_GPL(hv_get_register);
+
+void hv_set_register(unsigned int reg, u64 value)
+{
+ if (hv_nested)
+ reg = hv_get_nested_reg(reg);
+
+ hv_set_non_nested_register(reg, value);
+}
+EXPORT_SYMBOL_GPL(hv_set_register);
+
static void (*vmbus_handler)(void);
static void (*hv_stimer0_handler)(void);
static void (*hv_kexec_handler)(void);
@@ -301,6 +368,11 @@ static void __init ms_hyperv_init_platform(void)
pr_info("Hyper-V: running as root partition\n");
}
+ if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) {
+ hv_nested = true;
+ pr_info("Hyper-V: running on a nested hypervisor\n");
+ }
+
/*
* Extract host information.
*/
generated by cgit (git 2.34.1) at 2024-06-12 01:05:44 +0000