From: Borislav Petkov <bp@alien8.de>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>, Peter H Anvin <hpa@zytor.com>,
Dave Hansen <dave.hansen@intel.com>,
Tony Luck <tony.luck@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Sean Christopherson <seanjc@google.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 09/12] x86/tdx: Wire up KVM hypercalls
Date: Tue, 24 Aug 2021 18:34:45 +0200 [thread overview]
Message-ID: <YSUfpQPvL6wsk6Ou@zn.tnic> (raw)
In-Reply-To: <20210804181329.2899708-10-sathyanarayanan.kuppuswamy@linux.intel.com>
On Wed, Aug 04, 2021 at 11:13:26AM -0700, Kuppuswamy Sathyanarayanan wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> KVM hypercalls use the "vmcall" or "vmmcall" instructions.
Write instruction mnemonics in all caps pls.
> +# This option enables KVM specific hypercalls in TDX guest.
> +config INTEL_TDX_GUEST_KVM
What is that config option really for? IOW, can't you use
CONFIG_KVM_GUEST instead?
> + def_bool y
> + depends on KVM_GUEST && INTEL_TDX_GUEST
> +
> endif #HYPERVISOR_GUEST
>
> source "arch/x86/Kconfig.cpu"
> diff --git a/arch/x86/include/asm/asm-prototypes.h b/arch/x86/include/asm/asm-prototypes.h
> index 4cb726c71ed8..9855a9ff2924 100644
> --- a/arch/x86/include/asm/asm-prototypes.h
> +++ b/arch/x86/include/asm/asm-prototypes.h
> @@ -17,6 +17,10 @@
> extern void cmpxchg8b_emu(void);
> #endif
>
> +#ifdef CONFIG_INTEL_TDX_GUEST
> +#include <asm/tdx.h>
> +#endif
What "ASM sysmbol generation issue" forced this?
...
> diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
> index 846fe58f0426..8fa33e2c98db 100644
> --- a/arch/x86/include/asm/tdx.h
> +++ b/arch/x86/include/asm/tdx.h
> @@ -6,8 +6,9 @@
> #include <linux/cpufeature.h>
> #include <linux/types.h>
>
> -#define TDX_CPUID_LEAF_ID 0x21
> -#define TDX_HYPERCALL_STANDARD 0
> +#define TDX_CPUID_LEAF_ID 0x21
> +#define TDX_HYPERCALL_STANDARD 0
> +#define TDX_HYPERCALL_VENDOR_KVM 0x4d564b2e584454
"TDX.KVM"
Yeah, you can put it in a comment so that people don't have to do the
CTRL-V game in vim insert mode, i.e., ":help i_CTRL-V_digit" :-)
> /*
> * Used in __tdx_module_call() helper function to gather the
> @@ -80,4 +81,29 @@ static inline bool tdx_prot_guest_has(unsigned long flag) { return false; }
>
> #endif /* CONFIG_INTEL_TDX_GUEST */
>
> +#ifdef CONFIG_INTEL_TDX_GUEST_KVM
I don't think that even needs the ifdeffery. If it is not used, the
inline will simply get discarded so why bother?
> +
> +static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
> + unsigned long p2, unsigned long p3,
> + unsigned long p4)
> +{
> + struct tdx_hypercall_output out;
> + u64 err;
> +
> + err = __tdx_hypercall(TDX_HYPERCALL_VENDOR_KVM, nr, p1, p2,
> + p3, p4, &out);
> +
> + BUG_ON(err);
> +
> + return out.r10;
> +}
> +#else
> +static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
> + unsigned long p2, unsigned long p3,
> + unsigned long p4)
> +{
> + return -ENODEV;
> +}
> +#endif /* CONFIG_INTEL_TDX_GUEST_KVM */
> +
> #endif /* _ASM_X86_TDX_H */
> diff --git a/arch/x86/kernel/tdcall.S b/arch/x86/kernel/tdcall.S
> index 9df94f87465d..1823bac4542d 100644
> --- a/arch/x86/kernel/tdcall.S
> +++ b/arch/x86/kernel/tdcall.S
> @@ -3,6 +3,7 @@
> #include <asm/asm.h>
> #include <asm/frame.h>
> #include <asm/unwind_hints.h>
> +#include <asm/export.h>
>
> #include <linux/linkage.h>
> #include <linux/bits.h>
> @@ -309,3 +310,4 @@ skip_sti:
>
> retq
> SYM_FUNC_END(__tdx_hypercall)
> +EXPORT_SYMBOL(__tdx_hypercall);
EXPORT_SYMBOL_GPL, of course.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-08-24 16:34 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 18:13 [PATCH v5 00/12] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 01/12] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-08-12 7:18 ` Borislav Petkov
2021-08-12 17:17 ` Kuppuswamy, Sathyanarayanan
2021-08-17 12:50 ` Juergen Gross
2021-08-17 13:16 ` Kuppuswamy, Sathyanarayanan
2021-08-17 13:28 ` Juergen Gross
2021-08-17 13:39 ` Kuppuswamy, Sathyanarayanan
2021-08-17 13:47 ` Juergen Gross
2021-08-17 13:50 ` Kuppuswamy, Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 02/12] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 03/12] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-08-12 7:39 ` Borislav Petkov
2021-08-04 18:13 ` [PATCH v5 04/12] x86/tdx: Add protected guest support for TDX guest Kuppuswamy Sathyanarayanan
2021-08-04 21:59 ` Sean Christopherson
2021-08-04 22:03 ` Dave Hansen
2021-08-04 22:26 ` Kuppuswamy, Sathyanarayanan
2021-08-04 22:42 ` Sean Christopherson
2021-08-04 23:00 ` Kuppuswamy, Sathyanarayanan
2021-08-12 7:53 ` Borislav Petkov
2021-08-12 17:18 ` Kuppuswamy, Sathyanarayanan
2021-08-20 14:28 ` Borislav Petkov
2021-08-20 16:42 ` Kuppuswamy, Sathyanarayanan
2021-08-20 16:59 ` Borislav Petkov
2021-08-20 17:11 ` Kuppuswamy, Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 05/12] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kuppuswamy Sathyanarayanan
2021-08-20 15:16 ` Borislav Petkov
2021-08-04 18:13 ` [PATCH v5 06/12] x86/tdx: Get TD execution environment information via TDINFO Kuppuswamy Sathyanarayanan
2021-08-04 22:38 ` Sean Christopherson
2021-08-20 17:13 ` Borislav Petkov
2021-08-20 17:31 ` Kuppuswamy, Sathyanarayanan
2021-08-20 17:35 ` Borislav Petkov
2021-08-20 18:29 ` Kuppuswamy, Sathyanarayanan
2021-08-20 18:58 ` Andi Kleen
2021-08-20 19:01 ` Kuppuswamy, Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 07/12] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-08-24 10:17 ` Borislav Petkov
2021-08-24 17:32 ` Kuppuswamy, Sathyanarayanan
2021-08-24 17:36 ` Dave Hansen
2021-08-24 17:46 ` Borislav Petkov
2021-09-02 15:24 ` Kuppuswamy, Sathyanarayanan
2021-09-03 10:17 ` Borislav Petkov
2021-08-04 18:13 ` [PATCH v5 08/12] x86/tdx: Add HLT " Kuppuswamy Sathyanarayanan
2021-08-24 16:10 ` Borislav Petkov
2021-08-24 17:06 ` Sean Christopherson
2021-08-24 17:25 ` Andi Kleen
2021-08-24 17:27 ` Borislav Petkov
2021-08-24 17:47 ` Sean Christopherson
2021-08-24 17:50 ` Borislav Petkov
2021-08-31 20:49 ` Kuppuswamy, Sathyanarayanan
2021-09-01 7:42 ` Borislav Petkov
2021-08-24 18:18 ` Kuppuswamy, Sathyanarayanan
2021-08-24 18:28 ` Andi Kleen
2021-08-24 17:35 ` Kuppuswamy, Sathyanarayanan
2021-08-24 17:48 ` Borislav Petkov
2021-08-04 18:13 ` [PATCH v5 09/12] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-08-24 16:34 ` Borislav Petkov [this message]
2021-08-24 18:11 ` Kuppuswamy, Sathyanarayanan
2021-08-24 18:29 ` Borislav Petkov
2021-08-24 19:11 ` Kuppuswamy, Sathyanarayanan
2021-08-24 19:39 ` Borislav Petkov
2021-08-04 18:13 ` [PATCH v5 10/12] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-08-24 16:55 ` Borislav Petkov
2021-08-24 18:12 ` Kuppuswamy, Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 11/12] x86/tdx: Don't write CSTAR MSR on Intel Kuppuswamy Sathyanarayanan
2021-08-04 18:31 ` Sean Christopherson
2021-08-04 21:03 ` Kuppuswamy, Sathyanarayanan
2021-08-04 21:44 ` Sean Christopherson
2021-08-04 21:48 ` Dave Hansen
2021-08-04 22:23 ` Kuppuswamy, Sathyanarayanan
2021-08-04 18:13 ` [PATCH v5 12/12] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
2021-08-24 17:48 ` Borislav Petkov
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