Commit 48b1f683 authored by Tianyu Lan's avatar Tianyu Lan Committed by Wei Liu
Browse files

x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest 



In sev-snp enlightened guest, Hyper-V hypercall needs
to use vmmcall to trigger vmexit and notify hypervisor
to handle hypercall request.

Signed-off-by: default avatarTianyu Lan <tiala@microsoft.com>
Reviewed-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-6-ltykernel@gmail.com
parent 193061ea

arch/x86/include/asm/mshyperv.h

+27 −3
Original line number Diff line number Diff line
@@ -48,6 +48,8 @@ extern u64 hv_current_partition_id; 


extern union hv_ghcb * __percpu *hv_ghcb_pg;



extern bool hv_isolation_type_en_snp(void);



int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);

int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);

int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
@@ -59,6 +61,16 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 
	u64 hv_status;



#ifdef CONFIG_X86_64

	if (hv_isolation_type_en_snp()) {

		__asm__ __volatile__("mov %4, %%r8\n"

				     "vmmcall"

				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,

				       "+c" (control), "+d" (input_address)

				     :  "r" (output_address)

				     : "cc", "memory", "r8", "r9", "r10", "r11");

		return hv_status;

	}



	if (!hv_hypercall_pg)

		return U64_MAX;
@@ -102,7 +114,13 @@ static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 
	u64 hv_status;



#ifdef CONFIG_X86_64

	{

	if (hv_isolation_type_en_snp()) {

		__asm__ __volatile__(

				"vmmcall"

				: "=a" (hv_status), ASM_CALL_CONSTRAINT,

				"+c" (control), "+d" (input1)

				:: "cc", "r8", "r9", "r10", "r11");

	} else {

		__asm__ __volatile__(CALL_NOSPEC

				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,

				       "+c" (control), "+d" (input1)
@@ -147,7 +165,14 @@ static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 
	u64 hv_status;



#ifdef CONFIG_X86_64

	{

	if (hv_isolation_type_en_snp()) {

		__asm__ __volatile__("mov %4, %%r8\n"

				     "vmmcall"

				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,

				       "+c" (control), "+d" (input1)

				     : "r" (input2)

				     : "cc", "r8", "r9", "r10", "r11");

	} else {

		__asm__ __volatile__("mov %4, %%r8\n"

				     CALL_NOSPEC

				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
@@ -240,7 +265,6 @@ static inline void hv_vtom_init(void) {} 
#endif



extern bool hv_isolation_type_snp(void);

extern bool hv_isolation_type_en_snp(void);



static inline bool hv_is_synic_reg(unsigned int reg)

{