Joerg Roedel 02772fb9b6 x86/sev-es: Allocate and map an IST stack for #VC handler ... Allocate and map an IST stack and an additional fall-back stack for the #VC handler. The memory for the stacks is allocated only when SEV-ES is active. The #VC handler needs to use an IST stack because a #VC exception can be raised from kernel space with unsafe stack, e.g. in the SYSCALL entry path. Since the #VC exception can be nested, the #VC handler switches back to the interrupted stack when entered from kernel space. If switching back is not possible, the fall-back stack is used. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-43-joro@8bytes.org		2020-09-09 11:33:19 +02:00
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asm	x86/sev-es: Allocate and map an IST stack for #VC handler	2020-09-09 11:33:19 +02:00
uapi/asm	x86/boot/compressed/64: Setup a GHCB-based VC Exception handler	2020-09-07 19:45:25 +02:00