diff options
| author | Joerg Roedel <jroedel@suse.de> | 2020-09-08 15:35:17 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-09-09 11:45:24 +0300 |
| commit | 74d8d9d531b4cc945a9f75aa2fc21d99ca5a9fe3 (patch) | |
| tree | ba719ed3c3be8531a375850a80df229a29c375e1 /arch/x86/kernel/head64.c | |
| parent | f980f9c31a923e9040dee0bc679a5f5b09e61f40 (diff) | |
| download | linux-74d8d9d531b4cc945a9f75aa2fc21d99ca5a9fe3.tar.xz | |
x86/sev-es: Setup an early #VC handler
Setup an early handler for #VC exceptions. There is no GHCB mapped
yet, so just re-use the vc_no_ghcb_handler(). It can only handle
CPUID exit-codes, but that should be enough to get the kernel through
verify_cpu() and __startup_64() until it runs on virtual addresses.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
[ boot failure Error: kernel_ident_mapping_init() failed. ]
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lkml.kernel.org/r/20200908123517.GA3764@8bytes.org
Diffstat (limited to 'arch/x86/kernel/head64.c')
| -rw-r--r-- | arch/x86/kernel/head64.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 4282dac694c3..fc55cc9ccb0f 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -40,6 +40,7 @@ #include <asm/desc.h> #include <asm/extable.h> #include <asm/trapnr.h> +#include <asm/sev-es.h> /* * Manage page tables very early on. @@ -540,12 +541,34 @@ static struct desc_ptr bringup_idt_descr = { .address = 0, /* Set at runtime */ }; +static void set_bringup_idt_handler(gate_desc *idt, int n, void *handler) +{ +#ifdef CONFIG_AMD_MEM_ENCRYPT + struct idt_data data; + gate_desc desc; + + init_idt_data(&data, n, handler); + idt_init_desc(&desc, &data); + native_write_idt_entry(idt, n, &desc); +#endif +} + /* This runs while still in the direct mapping */ static void startup_64_load_idt(unsigned long physbase) { struct desc_ptr *desc = fixup_pointer(&bringup_idt_descr, physbase); + gate_desc *idt = fixup_pointer(bringup_idt_table, physbase); + + + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { + void *handler; + + /* VMM Communication Exception */ + handler = fixup_pointer(vc_no_ghcb, physbase); + set_bringup_idt_handler(idt, X86_TRAP_VC, handler); + } - desc->address = (unsigned long)fixup_pointer(bringup_idt_table, physbase); + desc->address = (unsigned long)idt; native_load_idt(desc); } |