linux-kernel - [PATCH V7 2/9] x86/hyperv: Initialize shared memory boundary in the Isolation VM.

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Message-Id: <20211006063651.1124737-3-ltykernel@gmail.com>
Date:   Wed,  6 Oct 2021 02:36:42 -0400
From:   Tianyu Lan <ltykernel@...il.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        davem@...emloft.net, kuba@...nel.org, gregkh@...uxfoundation.org,
        arnd@...db.de, jroedel@...e.de, brijesh.singh@....com,
        Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        pgonda@...gle.com, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, rppt@...nel.org, tj@...nel.org,
        aneesh.kumar@...ux.ibm.com, saravanand@...com, hannes@...xchg.org,
        rientjes@...gle.com, michael.h.kelley@...rosoft.com
Cc:     linux-arch@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        vkuznets@...hat.com, konrad.wilk@...cle.com, hch@....de,
        robin.murphy@....com, joro@...tes.org, parri.andrea@...il.com,
        dave.hansen@...el.com
Subject: [PATCH V7 2/9] x86/hyperv: Initialize shared memory boundary in the Isolation VM.

From: Tianyu Lan <Tianyu.Lan@...rosoft.com>

Hyper-V exposes shared memory boundary via cpuid
HYPERV_CPUID_ISOLATION_CONFIG and store it in the
shared_gpa_boundary of ms_hyperv struct. This prepares
to share memory with host for SNP guest.

Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
Change since v4:
	* Rename reserve field.

Change since v3:
	* user BIT_ULL to get shared_gpa_boundary
	* Rename field Reserved* to reserved
---
 arch/x86/kernel/cpu/mshyperv.c |  2 ++
 include/asm-generic/mshyperv.h | 12 +++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index b09ade389040..4794b716ec79 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -313,6 +313,8 @@ static void __init ms_hyperv_init_platform(void)
 	if (ms_hyperv.priv_high & HV_ISOLATION) {
 		ms_hyperv.isolation_config_a = cpuid_eax(HYPERV_CPUID_ISOLATION_CONFIG);
 		ms_hyperv.isolation_config_b = cpuid_ebx(HYPERV_CPUID_ISOLATION_CONFIG);
+		ms_hyperv.shared_gpa_boundary =
+			BIT_ULL(ms_hyperv.shared_gpa_boundary_bits);
 
 		pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n",
 			ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 2a709010f53d..ebe3727e1eb8 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -35,7 +35,17 @@ struct ms_hyperv_info {
 	u32 max_vp_index;
 	u32 max_lp_index;
 	u32 isolation_config_a;
-	u32 isolation_config_b;
+	union {
+		u32 isolation_config_b;
+		struct {
+			u32 cvm_type : 4;
+			u32 reserved1 : 1;
+			u32 shared_gpa_boundary_active : 1;
+			u32 shared_gpa_boundary_bits : 6;
+			u32 reserved2 : 20;
+		};
+	};
+	u64 shared_gpa_boundary;
 };
 extern struct ms_hyperv_info ms_hyperv;
 
-- 
2.25.1