Re: [PATCH v10 33/38] x86/entry: Add fred_entry_from_kvm() for VMX to handle IRQ/NMI

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On 9/14/23 06:48, Xin Li wrote:
+	/*
+	 * Don't check the FRED stack level, the call stack leading to this
+	 * helper is effectively constant and shallow (relatively speaking).

It's more that we don't need to protect from reentrancy. The external interrupt uses stack level 0 so no adjustment would be needed anyway, and NMI does not use an IST even in the non-FRED case.

+	 * Emulate the FRED-defined redzone and stack alignment.
+	 */
+	sub $(FRED_CONFIG_REDZONE_AMOUNT << 6), %rsp
+	and $FRED_STACK_FRAME_RSP_MASK, %rsp




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