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Message-ID: <SA1PR21MB1335D07F52F526341E5709D5BF15A@SA1PR21MB1335.namprd21.prod.outlook.com>
Date: Wed, 16 Aug 2023 21:32:36 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: Tianyu Lan <ltykernel@...il.com>,
KY Srinivasan <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
"wei.liu@...nel.org" <wei.liu@...nel.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>,
"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
"arnd@...db.de" <arnd@...db.de>,
"Michael Kelley (LINUX)" <mikelley@...rosoft.com>
CC: Tianyu Lan <Tianyu.Lan@...rosoft.com>,
"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
vkuznets <vkuznets@...hat.com>
Subject: RE: [PATCH v6 5/8] x86/hyperv: Use vmmcall to implement Hyper-V
hypercall in sev-snp enlightened guest
> From: Tianyu Lan <ltykernel@...il.com>
> Sent: Wednesday, August 16, 2023 8:59 AM
> [...]
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -59,16 +59,25 @@ static inline u64 hv_do_hypercall(u64 control, void
> *input, void *output)
> u64 hv_status;
>
> #ifdef CONFIG_X86_64
> - if (!hv_hypercall_pg)
> - return U64_MAX;
> + if (hv_isolation_type_en_snp()) {
I got a build failure:
In file included from arch/x86/hyperv/hv_spinlock.c:15:
./arch/x86/include/asm/mshyperv.h: In function 'hv_do_hypercall':
./arch/x86/include/asm/mshyperv.h:69:6: error: implicit declaration of function 'hv_isolation_type_en_snp' [-Werror=implicit-function-declaration]
69 | if (hv_isolation_type_en_snp()) {
| ^~~~~~~~~~~~~~~~~~~~~~~~
In arch/x86/include/asm/mshyperv.h, we do have
extern bool hv_isolation_type_en_snp(void);
but it's defined at a late place. I think we need to move it to before
hv_do_hypercall().
We also have
extern bool hv_isolation_type_en_snp(void);
in include/asm-generic/mshyperv.h, but that header file
is included at the end of arch/x86/include/asm/mshyperv.h.
> + __asm__ __volatile__("mov %4, %%r8\n"
> + "vmmcall"
> + : "=a" (hv_status),
> ASM_CALL_CONSTRAINT,
> + "+c" (control), "+d" (input_address)
> + : "r" (output_address)
> + : "cc", "memory", "r8", "r9", "r10", "r11");
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