From c789b90a69045d1924bc0802ae0dce2bba05a04e Mon Sep 17 00:00:00 2001 From: Tianyu Lan Date: Mon, 13 Dec 2021 02:14:03 -0500 Subject: 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 Acked-by: Borislav Petkov Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20211213071407.314309-3-ltykernel@gmail.com Signed-off-by: Wei Liu --- arch/x86/kernel/cc_platform.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/x86/kernel/cc_platform.c') diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c index 03bb2f343ddb..6cb3a675e686 100644 --- a/arch/x86/kernel/cc_platform.c +++ b/arch/x86/kernel/cc_platform.c @@ -11,6 +11,7 @@ #include #include +#include #include 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); -- cgit v1.2.3