Thread (116 messages) 116 messages, 7 authors, 2021-09-06

Re: [PATCH v6 42/76] x86/sev-es: Setup early #VC handler

From: Lai Jiangshan <hidden>
Date: 2021-09-04 09:39:55
Also in: lkml

quoted hunk ↗ jump to hunk
@@ -363,6 +370,33 @@ SYM_CODE_START_LOCAL(early_idt_handler_common)
        jmp restore_regs_and_return_to_kernel
 SYM_CODE_END(early_idt_handler_common)

+#ifdef CONFIG_AMD_MEM_ENCRYPT
+/*
+ * VC Exception handler used during very early boot. The
+ * early_idt_handler_array can't be used because it returns via the
+ * paravirtualized INTERRUPT_RETURN and pv-ops don't work that early.
Hello Joerg, Juergen

The commit ae755b5a4548 ("x86/paravirt: Switch iret pvops to ALTERNATIVE")
( https://lore.kernel.org/lkml/20210311142319.4723-12-jgross@suse.com/ (local) )
had been merged and the paravirt_iret is deferenced based via %rip.

Can INTERRUPT_RETURN still be a problem if early_idt_handler_array
is used instead for bringup IDT?

Thanks
Lai
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