Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()
From: Wei Liu <wei.liu@kernel.org>
Date: 2021-12-14 15:33:10
Also in:
linux-arch, linux-hyperv, linux-iommu, linux-scsi, lkml
On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
From: Tianyu Lan <redacted> 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. e.g, swiotlb bounce buffer size needs to adjust according to memory size in the sev_setup_arch(). Add GUEST_MEM_ENCRYPT check for Hyper-V Isolation VM. Signed-off-by: Tianyu Lan <redacted>
x86 maintainers, any comment on this patch?
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);-- 2.25.1