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x86/pvh: Use fixed_percpu_data for early boot GSBASE

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Instead of having a private area for the stack canary, use
fixed_percpu_data for GSBASE like the native kernel.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250123190747.745588-5-brgerst@gmail.com
This commit is contained in:
Brian Gerst 2025-01-23 14:07:36 -05:00 committed by Ingo Molnar
parent a9a76b38aa
commit f58b63857a
1 changed files with 9 additions and 6 deletions
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15
arch/x86/platform/pvh/head.S
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@ -173,10 +173,15 @@ SYM_CODE_START(pvh_start_xen)
1:
UNWIND_HINT_END_OF_STACK
/* Set base address in stack canary descriptor. */
mov $MSR_GS_BASE,%ecx
leal canary(%rip), %eax
xor %edx, %edx
/*
* Set up GSBASE.
* Note that on SMP the boot CPU uses the init data section until
* the per-CPU areas are set up.
*/
movl $MSR_GS_BASE,%ecx
leaq INIT_PER_CPU_VAR(fixed_percpu_data)(%rip), %rdx
movq %edx, %eax
shrq $32, %rdx
wrmsr
/* Call xen_prepare_pvh() via the kernel virtual mapping */
@ -238,8 +243,6 @@ SYM_DATA_START_LOCAL(gdt_start)
SYM_DATA_END_LABEL(gdt_start, SYM_L_LOCAL, gdt_end)
.balign 16
SYM_DATA_LOCAL(canary, .fill 48, 1, 0)
SYM_DATA_START_LOCAL(early_stack)
.fill BOOT_STACK_SIZE, 1, 0
SYM_DATA_END_LABEL(early_stack, SYM_L_LOCAL, early_stack_end)