On Mon, Jan 29, 2024 at 04:24:09AM -0600, Kalra, Ashish wrote:
> In case of SNP and crash/kdump case, we need to prevent the boot_ghcb being
> converted to shared (in snp_kexec_unshare_mem()) as the boot_ghcb is
> required to handle all I/O for disabling IO-APIC/lapic, hpet, etc., as the
> enc_kexec_unshare_mem() callback is invoked before the apics, hpet, etc. are
> disabled.
>
> Is there any reason why enc_kexec_unshare_mem() callback is invoked in crash
> case before the IO-APIC/lapic, hpet, etc. are shutdown/disabled ?
Not really. Either way works for TDX. I've tested the patch below. Is it
what you want?
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 6585a5f2c2ba..3001f4857ed7 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -107,11 +107,6 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
crash_smp_send_stop();
- if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
- x86_platform.guest.enc_kexec_stop_conversion(true);
- x86_platform.guest.enc_kexec_unshare_mem();
- }
-
cpu_emergency_disable_virtualization();
/*
@@ -129,6 +124,12 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif
+
+ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
+ x86_platform.guest.enc_kexec_stop_conversion(true);
+ x86_platform.guest.enc_kexec_unshare_mem();
+ }
+
crash_save_cpu(regs, safe_smp_processor_id());
}
--
Kiryl Shutsemau / Kirill A. Shutemov
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