[PATCH v7 02/45] x86/sev: detect/setup SEV/SME features earlier in boot

Brijesh Singh
2021-11-10T22:23:42Z

From: Michael Roth <michael.roth@amd.com>

sme_enable() handles feature detection for both SEV and SME. Future
patches will also use it for SEV-SNP feature detection/setup, which
will need to be done immediately after the first #VC handler is set up.
Move it now in preparation.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/include/asm/setup.h | 2 +-
arch/x86/kernel/head64.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index a12458a7a8d4..cee1e816fdcd 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -50,7 +50,7 @@ extern void reserve_standard_io_resources(void);
extern void i386_reserve_resources(void);
extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
extern unsigned long __startup_secondary_64(void);
-extern void startup_64_setup_env(unsigned long physbase);
+extern void startup_64_setup_env(unsigned long physbase, struct boot_params *bp);
extern void early_setup_idt(void);
extern void __init do_early_exception(struct pt_regs *regs, int trapnr);

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index fc5371a7e9d1..4eb83ae7ceb8 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -163,9 +163,6 @@ unsigned long __head __startup_64(unsigned long physaddr,
if (load_delta & ~PMD_PAGE_MASK)
for (;;);

- /* Activate Secure Memory Encryption (SME) if supported and enabled */
- sme_enable(bp);
-
/* Include the SME encryption mask in the fixup value */
load_delta += sme_get_me_mask();

@@ -594,7 +591,7 @@ void early_setup_idt(void)
/*
* Setup boot CPU state needed before kernel switches to virtual addresses.
*/
-void __head startup_64_setup_env(unsigned long physbase)
+void __head startup_64_setup_env(unsigned long physbase, struct boot_params *bp)
{
/* Load GDT */
startup_gdt_descr.address = (unsigned long)fixup_pointer(startup_gdt, physbase);
@@ -606,4 +603,7 @@ void __head startup_64_setup_env(unsigned long physbase)
"movl %%eax, %%es\n" : : "a"(__KERNEL_DS) : "memory");

startup_64_load_idt(physbase);
+
+ /* Activate SEV/SME memory encryption if supported/enabled. */
+ sme_enable(bp);
}
--
2.25.1