Messages in this thread | | | Date | Tue, 14 Dec 2021 15:33:03 +0000 | From | Wei Liu <> | Subject | Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has() |
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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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