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    SubjectRe: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()
    On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
    > From: Tianyu Lan <Tianyu.Lan@microsoft.com>
    >
    > 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 <Tianyu.Lan@microsoft.com>

    x86 maintainers, any comment on this patch?

    > ---
    > 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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