diff options
author | Tianyu Lan <Tianyu.Lan@microsoft.com> | 2021-10-25 15:21:06 +0300 |
---|---|---|
committer | Wei Liu <wei.liu@kernel.org> | 2021-10-28 13:47:52 +0300 |
commit | 0cc4f6d9f0b9f20f3f1e1149bdb6737c0b4e134a (patch) | |
tree | 6b38683b18f98bd2a5950149d5d2d29793833cdb /arch/x86 | |
parent | e82f2069b52fb350f4ea568957dcc5c9f3649999 (diff) | |
download | linux-0cc4f6d9f0b9f20f3f1e1149bdb6737c0b4e134a.tar.xz |
x86/hyperv: Initialize GHCB page in Isolation VM
Hyperv exposes GHCB page via SEV ES GHCB MSR for SNP guest
to communicate with hypervisor. Map GHCB page for all
cpus to read/write MSR register and submit hvcall request
via ghcb page.
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Link: https://lore.kernel.org/r/20211025122116.264793-2-ltykernel@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/hyperv/hv_init.c | 68 | ||||
-rw-r--r-- | arch/x86/include/asm/mshyperv.h | 4 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 3 |
3 files changed, 68 insertions, 7 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 708a2712a516..a7e922755ad1 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -20,6 +20,7 @@ #include <linux/kexec.h> #include <linux/version.h> #include <linux/vmalloc.h> +#include <linux/io.h> #include <linux/mm.h> #include <linux/hyperv.h> #include <linux/slab.h> @@ -36,12 +37,42 @@ EXPORT_SYMBOL_GPL(hv_current_partition_id); void *hv_hypercall_pg; EXPORT_SYMBOL_GPL(hv_hypercall_pg); +void __percpu **hv_ghcb_pg; + /* Storage to save the hypercall page temporarily for hibernation */ static void *hv_hypercall_pg_saved; struct hv_vp_assist_page **hv_vp_assist_page; EXPORT_SYMBOL_GPL(hv_vp_assist_page); +static int hyperv_init_ghcb(void) +{ + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; + + if (!hv_isolation_type_snp()) + return 0; + + if (!hv_ghcb_pg) + return -EINVAL; + + /* + * GHCB page is allocated by paravisor. The address + * returned by MSR_AMD64_SEV_ES_GHCB is above shared + * memory boundary and map it here. + */ + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB); + if (!ghcb_va) + return -ENOMEM; + + ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg); + *ghcb_base = ghcb_va; + + return 0; +} + static int hv_cpu_init(unsigned int cpu) { union hv_vp_assist_msr_contents msr = { 0 }; @@ -85,7 +116,7 @@ static int hv_cpu_init(unsigned int cpu) } } - return 0; + return hyperv_init_ghcb(); } static void (*hv_reenlightenment_cb)(void); @@ -177,6 +208,14 @@ static int hv_cpu_die(unsigned int cpu) { struct hv_reenlightenment_control re_ctrl; unsigned int new_cpu; + void **ghcb_va; + + if (hv_ghcb_pg) { + ghcb_va = (void **)this_cpu_ptr(hv_ghcb_pg); + if (*ghcb_va) + memunmap(*ghcb_va); + *ghcb_va = NULL; + } hv_common_cpu_die(cpu); @@ -366,10 +405,16 @@ void __init hyperv_init(void) goto common_free; } + if (hv_isolation_type_snp()) { + hv_ghcb_pg = alloc_percpu(void *); + if (!hv_ghcb_pg) + goto free_vp_assist_page; + } + cpuhp = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online", hv_cpu_init, hv_cpu_die); if (cpuhp < 0) - goto free_vp_assist_page; + goto free_ghcb_page; /* * Setup the hypercall page and enable hypercalls. @@ -383,10 +428,8 @@ void __init hyperv_init(void) VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); - if (hv_hypercall_pg == NULL) { - wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto remove_cpuhp_state; - } + if (hv_hypercall_pg == NULL) + goto clean_guest_os_id; rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); hypercall_msr.enable = 1; @@ -456,8 +499,11 @@ void __init hyperv_init(void) hv_query_ext_cap(0); return; -remove_cpuhp_state: +clean_guest_os_id: + wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); cpuhp_remove_state(cpuhp); +free_ghcb_page: + free_percpu(hv_ghcb_pg); free_vp_assist_page: kfree(hv_vp_assist_page); hv_vp_assist_page = NULL; @@ -559,3 +605,11 @@ bool hv_is_isolation_supported(void) { return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; } + +DEFINE_STATIC_KEY_FALSE(isolation_type_snp); + +bool hv_isolation_type_snp(void) +{ + return static_branch_unlikely(&isolation_type_snp); +} +EXPORT_SYMBOL_GPL(hv_isolation_type_snp); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index adccbc209169..37739a277ac6 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -11,6 +11,8 @@ #include <asm/paravirt.h> #include <asm/mshyperv.h> +DECLARE_STATIC_KEY_FALSE(isolation_type_snp); + typedef int (*hyperv_fill_flush_list_func)( struct hv_guest_mapping_flush_list *flush, void *data); @@ -39,6 +41,8 @@ extern void *hv_hypercall_pg; extern u64 hv_current_partition_id; +extern void __percpu **hv_ghcb_pg; + 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); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index e095c28d27ae..b09ade389040 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -316,6 +316,9 @@ static void __init ms_hyperv_init_platform(void) pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); + + if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) + static_branch_enable(&isolation_type_snp); } if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) { |