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x86/hyperv: Remove hv_isolation_type_en_snp

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In ms_hyperv_init_platform(), do not distinguish between a SNP VM with
the paravisor and a SNP VM without the paravisor.

Replace hv_isolation_type_en_snp() with
!ms_hyperv.paravisor_present && hv_isolation_type_snp().

The hv_isolation_type_en_snp() in drivers/hv/hv.c and
drivers/hv/hv_common.c can be changed to hv_isolation_type_snp() since
we know !ms_hyperv.paravisor_present is true there.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230824080712.30327-10-decui@microsoft.com
This commit is contained in:
Dexuan Cui 2023-08-24 01:07:11 -07:00 committed by Wei Liu
parent b9b4fe3a72
commit e3131f1c81
7 changed files with 17 additions and 39 deletions
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8
arch/x86/hyperv/hv_init.c
View File

@ -52,7 +52,7 @@ static int hyperv_init_ghcb(void)
void *ghcb_va;
void **ghcb_base;
if (!hv_isolation_type_snp())
if (!ms_hyperv.paravisor_present || !hv_isolation_type_snp())
return 0;
if (!hv_ghcb_pg)
@ -117,7 +117,7 @@ static int hv_cpu_init(unsigned int cpu)
* is blocked to run in Confidential VM. So only decrypt assist
* page in non-root partition here.
*/
if (*hvp && hv_isolation_type_en_snp()) {
if (*hvp && !ms_hyperv.paravisor_present && hv_isolation_type_snp()) {
WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1));
memset(*hvp, 0, PAGE_SIZE);
}
@ -460,7 +460,7 @@ void __init hyperv_init(void)
goto common_free;
}
if (hv_isolation_type_snp()) {
if (ms_hyperv.paravisor_present && hv_isolation_type_snp()) {
/* Negotiate GHCB Version. */
if (!hv_ghcb_negotiate_protocol())
hv_ghcb_terminate(SEV_TERM_SET_GEN,
@ -583,7 +583,7 @@ skip_hypercall_pg_init:
hv_query_ext_cap(0);
/* Find the VTL */
if (hv_isolation_type_en_snp())
if (!ms_hyperv.paravisor_present && hv_isolation_type_snp())
ms_hyperv.vtl = get_vtl();
return;

12
arch/x86/hyperv/ivm.c
View File

@ -637,7 +637,7 @@ bool hv_is_isolation_supported(void)
DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
/*
* hv_isolation_type_snp - Check system runs in the AMD SEV-SNP based
* hv_isolation_type_snp - Check if the system runs in an AMD SEV-SNP based
* isolation VM.
*/
bool hv_isolation_type_snp(void)
@ -645,16 +645,6 @@ bool hv_isolation_type_snp(void)
return static_branch_unlikely(&isolation_type_snp);
}
DEFINE_STATIC_KEY_FALSE(isolation_type_en_snp);
/*
* hv_isolation_type_en_snp - Check system runs in the AMD SEV-SNP based
* isolation enlightened VM.
*/
bool hv_isolation_type_en_snp(void)
{
return static_branch_unlikely(&isolation_type_en_snp);
}
DEFINE_STATIC_KEY_FALSE(isolation_type_tdx);
/*
* hv_isolation_type_tdx - Check if the system runs in an Intel TDX based

11
arch/x86/include/asm/mshyperv.h
View File

@ -26,7 +26,6 @@
union hv_ghcb;
DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
DECLARE_STATIC_KEY_FALSE(isolation_type_en_snp);
DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
typedef int (*hyperv_fill_flush_list_func)(
@ -50,7 +49,7 @@ extern u64 hv_current_partition_id;
extern union hv_ghcb * __percpu *hv_ghcb_pg;
extern bool hv_isolation_type_en_snp(void);
bool hv_isolation_type_snp(void);
bool hv_isolation_type_tdx(void);
u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
@ -79,7 +78,7 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
return hv_tdx_hypercall(control, input_address, output_address);
if (hv_isolation_type_en_snp()) {
if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
__asm__ __volatile__("mov %4, %%r8\n"
"vmmcall"
: "=a" (hv_status), ASM_CALL_CONSTRAINT,
@ -135,7 +134,7 @@ static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
return hv_tdx_hypercall(control, input1, 0);
if (hv_isolation_type_en_snp()) {
if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
__asm__ __volatile__(
"vmmcall"
: "=a" (hv_status), ASM_CALL_CONSTRAINT,
@ -189,7 +188,7 @@ static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
return hv_tdx_hypercall(control, input1, input2);
if (hv_isolation_type_en_snp()) {
if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
__asm__ __volatile__("mov %4, %%r8\n"
"vmmcall"
: "=a" (hv_status), ASM_CALL_CONSTRAINT,
@ -284,8 +283,6 @@ static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
static inline int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; }
#endif
extern bool hv_isolation_type_snp(void);
#if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
void hv_vtom_init(void);
void hv_ivm_msr_write(u64 msr, u64 value);

8
arch/x86/kernel/cpu/mshyperv.c
View File

@ -304,7 +304,7 @@ static void __init hv_smp_prepare_cpus(unsigned int max_cpus)
* Override wakeup_secondary_cpu_64 callback for SEV-SNP
* enlightened guest.
*/
if (hv_isolation_type_en_snp()) {
if (!ms_hyperv.paravisor_present && hv_isolation_type_snp()) {
apic->wakeup_secondary_cpu_64 = hv_snp_boot_ap;
return;
}
@ -440,10 +440,7 @@ static void __init ms_hyperv_init_platform(void)
if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) {
if (ms_hyperv.paravisor_present)
static_branch_enable(&isolation_type_snp);
else
static_branch_enable(&isolation_type_en_snp);
} else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_TDX) {
static_branch_enable(&isolation_type_tdx);
@ -556,7 +553,8 @@ static void __init ms_hyperv_init_platform(void)
# ifdef CONFIG_SMP
smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
if (hv_root_partition || hv_isolation_type_en_snp())
if (hv_root_partition ||
(!ms_hyperv.paravisor_present && hv_isolation_type_snp()))
smp_ops.smp_prepare_cpus = hv_smp_prepare_cpus;
# endif

4
drivers/hv/hv.c
View File

@ -164,7 +164,7 @@ int hv_synic_alloc(void)
}
if (!ms_hyperv.paravisor_present &&
(hv_isolation_type_en_snp() || hv_isolation_type_tdx())) {
(hv_isolation_type_snp() || hv_isolation_type_tdx())) {
ret = set_memory_decrypted((unsigned long)
hv_cpu->synic_message_page, 1);
if (ret) {
@ -225,7 +225,7 @@ void hv_synic_free(void)
}
if (!ms_hyperv.paravisor_present &&
(hv_isolation_type_en_snp() || hv_isolation_type_tdx())) {
(hv_isolation_type_snp() || hv_isolation_type_tdx())) {
if (hv_cpu->synic_message_page) {
ret = set_memory_encrypted((unsigned long)
hv_cpu->synic_message_page, 1);

8
drivers/hv/hv_common.c
View File

@ -383,7 +383,7 @@ int hv_common_cpu_init(unsigned int cpu)
}
if (!ms_hyperv.paravisor_present &&
(hv_isolation_type_en_snp() || hv_isolation_type_tdx())) {
(hv_isolation_type_snp() || hv_isolation_type_tdx())) {
ret = set_memory_decrypted((unsigned long)mem, pgcount);
if (ret) {
/* It may be unsafe to free 'mem' */
@ -532,12 +532,6 @@ bool __weak hv_isolation_type_snp(void)
}
EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
bool __weak hv_isolation_type_en_snp(void)
{
return false;
}
EXPORT_SYMBOL_GPL(hv_isolation_type_en_snp);
bool __weak hv_isolation_type_tdx(void)
{
return false;

3
include/asm-generic/mshyperv.h
View File

@ -64,8 +64,7 @@ extern void * __percpu *hyperv_pcpu_output_arg;
extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
extern bool hv_isolation_type_snp(void);
extern bool hv_isolation_type_en_snp(void);
bool hv_isolation_type_snp(void);
bool hv_isolation_type_tdx(void);
/* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */