diff options
| author |   Tianyu Lan <tiala@microsoft.com> | 2023-08-18 06:29:15 -0400 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2023-08-22 00:38:20 +0000 |
| commit | 48b1f68372ca93ff67812d99c8d7351aaee62a2a (patch) | |
| tree | fa302d83e638241c413556f9a5c5fa48c64ca3ce /arch/x86/include/asm/mshyperv.h | |
| parent | drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest (diff) | |
| download | wireguard-linux-48b1f68372ca93ff67812d99c8d7351aaee62a2a.tar.xz wireguard-linux-48b1f68372ca93ff67812d99c8d7351aaee62a2a.zip | |
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
Diffstat (limited to 'arch/x86/include/asm/mshyperv.h')
| -rw-r--r-- | arch/x86/include/asm/mshyperv.h | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 9f11f0495950..8660d6bca6f2 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -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) { |