Commit c789b90a authored Dec 13, 2021 by Tianyu Lan Committed by Wei Liu Dec 20, 2021

x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()



Hyper-V provides Isolation VM for confidential computing support and
guest memory is encrypted in it. Places checking cc_platform_has()
with GUEST_MEM_ENCRYPT attr should return "True" in Isolation VM.

Hyper-V Isolation VMs need to adjust the SWIOTLB size just like SEV
guests. Add a hyperv_cc_platform_has() variant which enables that.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Acked-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20211213071407.314309-3-ltykernel@gmail.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>

parent 1a5e91d8

arch/x86/kernel/cc_platform.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@
		#include <linux/cc_platform.h>
		#include <linux/mem_encrypt.h>

		#include <asm/mshyperv.h>
		#include <asm/processor.h>

		static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr)
		@@ -58,12 +59,19 @@ static bool amd_cc_platform_has(enum cc_attr attr)
		#endif
		}

		static bool hyperv_cc_platform_has(enum cc_attr attr)
		{
		return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
		}

		bool cc_platform_has(enum cc_attr attr)
		{
		if (sme_me_mask)
		return amd_cc_platform_has(attr);

		if (hv_is_isolation_supported())
		return hyperv_cc_platform_has(attr);

		return false;
		}
		EXPORT_SYMBOL_GPL(cc_platform_has);