Re: [PATCH V6.1] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()
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From: Tianyu Lan <hidden>
Date: 2021-12-08 15:12:46
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On 12/8/2021 10:52 PM, Tianyu Lan wrote:
From: Tianyu Lan <redacted> 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 <redacted>
Hi Boris: Could you check whether this version is ok with you? Thanks.
quoted hunk ↗ jump to hunk
--- 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);