diff options
| author | Tianyu Lan <Tianyu.Lan@microsoft.com> | 2021-12-13 02:14:03 -0500 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-12-20 18:01:09 +0000 |
| commit | c789b90a69045d1924bc0802ae0dce2bba05a04e (patch) | |
| tree | 9b6967e2a8347a4caa07c7d3d712b59e06e88b29 | |
| parent | 1a5e91d8375fc8369207cc0b9894a324f2bbf1d9 (diff) | |
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>
| -rw-r--r-- | arch/x86/kernel/cc_platform.c | 8 |
1 files changed, 8 insertions, 0 deletions
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 <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); |