Messages in this thread Patch in this message | | | From | Tianyu Lan <> | Subject | [PATCH V6.1] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has() | Date | Wed, 8 Dec 2021 09:52:28 -0500 |
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From: Tianyu Lan <Tianyu.Lan@microsoft.com>
Hyper-V provides Isolation VM which encrypt guest memory. In isolation VM, swiotlb bounce buffer size needs to adjust according to memory size in the sev_setup_arch(). Add GUEST_MEM_ ENCRYPT check in the Isolation VM.
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com> --- Change since v6: * Change the order in the cc_platform_has() and check sev first.
Change since v3: * Change code style of checking GUEST_MEM attribute in the hyperv_cc_platform_has(). --- arch/x86/kernel/cc_platform.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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); -- 2.25.1
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