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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: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-6-ltykernel@gmail.com
This commit is contained in:
Tianyu Lan 2023-08-18 06:29:15 -04:00 committed by Wei Liu
parent 193061ea0a
commit 48b1f68372
1 changed files with 27 additions and 3 deletions
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30
arch/x86/include/asm/mshyperv.h
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@ -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)
{