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Date: Thu, 17 Mar 2022 17:03:37 +0100 From: Borislav Petkov <bp@...en8.de> To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Cc: tglx@...utronix.de, mingo@...hat.com, dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org, sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com, ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com, hpa@...or.com, jgross@...e.com, jmattson@...gle.com, joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org, pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com, tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com, thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org, linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...ux.intel.com> Subject: Re: [PATCHv6 03/30] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions On Wed, Mar 16, 2022 at 05:08:29AM +0300, Kirill A. Shutemov wrote: > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com> > > Guests communicate with VMMs with hypercalls. Historically, these > are implemented using instructions that are known to cause VMEXITs > like VMCALL, VMLAUNCH, etc. However, with TDX, VMEXITs no longer > expose the guest state to the host. This prevents the old hypercall > mechanisms from working. So, to communicate with VMM, TDX > specification defines a new instruction called TDCALL. ... > For registers used by the TDCALL instruction, please check TDX GHCI > specification, the section titled "TDCALL instruction" and "TDG.VP.VMCALL > Interface". > > Based on previous patch by Sean Christopherson. > > Reviewed-by: Tony Luck <tony.luck@...el.com> > Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> > Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com> > --- > arch/x86/coco/tdx/Makefile | 2 +- > arch/x86/coco/tdx/tdcall.S | 191 ++++++++++++++++++++++++++++++++++ > arch/x86/coco/tdx/tdx.c | 23 ++++ > arch/x86/include/asm/tdx.h | 27 +++++ > arch/x86/kernel/asm-offsets.c | 8 ++ > 5 files changed, 250 insertions(+), 1 deletion(-) > create mode 100644 arch/x86/coco/tdx/tdcall.S With tglx's comment fixed: Reviewed-by: Borislav Petkov <bp@...e.de> -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
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