Message-ID: <faa0eb3bb8ba0326d501516a057ab46eaf1f3c05.camel@infradead.org>
Subject: Re: [PATCH v13 00/11] Parallel CPU bringup for x86_64
From:   David Woodhouse <dwmw2@infradead.org>
To:     Usama Arif <usama.arif@bytedance.com>, tglx@linutronix.de,
        kim.phillips@amd.com, brgerst@gmail.com
Cc:     piotrgorski@cachyos.org, oleksandr@natalenko.name,
        arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org,
        pbonzini@redhat.com, paulmck@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
        thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de,
        fam.zheng@bytedance.com, punit.agrawal@bytedance.com,
        simon.evans@bytedance.com, liangma@liangbit.com
Date:   Tue, 07 Mar 2023 14:42:46 +0000
In-Reply-To: <20230302111227.2102545-1-usama.arif@bytedance.com>
References: <20230302111227.2102545-1-usama.arif@bytedance.com>
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On Thu, 2023-03-02 at 11:12 +0000, Usama Arif wrote:
> The main code change over v12 is to fix the build error when
> CONFIG_FORCE_NR_CPUS is present.
>=20
> The commit message for removing initial stack has also been improved, typ=
os
> have been fixed and extra comments have been added to make code clearer.

Might something like this make it work in parallel with SEV-SNP? If so,
I can clean it up and adjust the C code to actually invoke it...

diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-c=
ommon.h
index b8357d6ecd47..f25df4bd318e 100644
--- a/arch/x86/include/asm/sev-common.h
+++ b/arch/x86/include/asm/sev-common.h
@@ -70,6 +70,7 @@
 	/* GHCBData[63:12] */				\
 	(((u64)(v) & GENMASK_ULL(63, 12)) >> 12)
=20
+#ifndef __ASSEMBLY__
 /*
  * SNP Page State Change Operation
  *
@@ -160,6 +161,8 @@ struct snp_psc_desc {
=20
 #define GHCB_RESP_CODE(v)		((v) & GHCB_MSR_INFO_MASK)
=20
+#endif /* __ASSEMBLY__ */
+
 /*
  * Error codes related to GHCB input that can be communicated back to the =
guest
  * by setting the lower 32-bits of the GHCB SW_EXITINFO1 field to 2.
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index defe76ee9e64..0c26f80f488c 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -204,6 +204,7 @@ extern unsigned int smpboot_control;
 /* Control bits for startup_64 */
 #define STARTUP_APICID_CPUID_0B	0x80000000
 #define STARTUP_APICID_CPUID_01	0x40000000
+#define STARTUP_APICID_SEV_SNP	0x20000000
=20
 #define STARTUP_PARALLEL_MASK (STARTUP_APICID_CPUID_01 | STARTUP_APICID_CP=
UID_0B)
=20
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index c35f7c173832..b2571034562c 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -26,7 +26,7 @@
 #include <asm/nospec-branch.h>
 #include <asm/fixmap.h>
 #include <asm/smp.h>
-
+#include <asm/sev-common.h>
 /*
  * We are not able to switch in one step to the final KERNEL ADDRESS SPACE
  * because we need identity-mapped pages.
@@ -242,6 +242,7 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_G=
LOBAL)
 	 *
 	 * Bit 31	STARTUP_APICID_CPUID_0B flag (use CPUID 0x0b)
 	 * Bit 30	STARTUP_APICID_CPUID_01 flag (use CPUID 0x01)
+	 * Bit 29	STARTUP_APICID_SEV_SNP flag (CPUID 0x0v via GHCB MSR)
 	 * Bit 0-24	CPU# if STARTUP_APICID_CPUID_xx flags are not set
 	 */
 	movl	smpboot_control(%rip), %ecx
@@ -249,6 +250,8 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_G=
LOBAL)
 	jnz	.Luse_cpuid_0b
 	testl	$STARTUP_APICID_CPUID_01, %ecx
 	jnz	.Luse_cpuid_01
+	testl	$STARTUP_APICID_SEV_SNP, %ecx
+	jnz	.Luse_sev_cpuid_0b
 	andl	$0x0FFFFFFF, %ecx
 	jmp	.Lsetup_cpu
=20
@@ -259,6 +262,18 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_=
GLOBAL)
 	shr	$24, %edx
 	jmp	.Lsetup_AP
=20
+.Luse_sev_cpuid_0b:
+	movl	$MSR_AMD64_SEV_ES_GHCB, %ecx
+	# GHCB_CPUID_REQ(0x0b, GHCB_CPUID_REQ_EDX)
+	movq	$0xc00000040000000b, %rax
+	xorl	%edx, %edx
+	vmgexit
+	rdmsr
+	andl	$GHCB_MSR_INFO_MASK, %eax
+	cmpl	$GHCB_MSR_CPUID_RESP, %eax
+	jne	1f
+	jmp	.Lsetup_AP
+
 .Luse_cpuid_0b:
 	mov	$0x0B, %eax
 	xorl	%ecx, %ecx


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