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From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
	arnd@arndb.de, akpm@linux-foundation.org,
	gregkh@linuxfoundation.org, konrad.wilk@oracle.com, hch@lst.de,
	m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org,
	will@kernel.org, davem@davemloft.net, kuba@kernel.org,
	jejb@linux.ibm.com, martin.petersen@oracle.com
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
	iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, linux-scsi@vger.kernel.org,
	netdev@vger.kernel.org, vkuznets@redhat.com,
	thomas.lendacky@amd.com, brijesh.singh@amd.com,
	sunilmut@microsoft.com
Subject: [Resend RFC PATCH V2 02/12] x86/HV: Initialize shared memory boundary in Isolation VM
Date: Wed, 14 Apr 2021 10:49:35 -0400
Message-ID: <20210414144945.3460554-3-ltykernel@gmail.com> (raw)
In-Reply-To: <20210414144945.3460554-1-ltykernel@gmail.com>

From: Tianyu Lan <Tianyu.Lan@microsoft.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 AMD SEV SNP guest.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c |  2 ++
 include/asm-generic/mshyperv.h | 13 ++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index e88bc296afca..aeafd4017c89 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -328,6 +328,8 @@ static void __init ms_hyperv_init_platform(void)
 	if (ms_hyperv.features_b & 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 =
+			(u64)1 << 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 c6f4c5c20fb8..b73e201abc70 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -34,8 +34,19 @@ 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 Reserved11 : 1;
+			u32 shared_gpa_boundary_active : 1;
+			u32 shared_gpa_boundary_bits : 6;
+			u32 Reserved12 : 20;
+		};
+	};
 	void  __percpu **ghcb_base;
+	u64 shared_gpa_boundary;
 };
 extern struct ms_hyperv_info ms_hyperv;
 
-- 
2.25.1


  parent reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14 14:49 [Resend RFC PATCH V2 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-04-14 14:49 ` [Resend RFC PATCH V2 01/12] x86/HV: Initialize GHCB page in Isolation VM Tianyu Lan
2021-04-14 14:49 ` Tianyu Lan [this message]
2021-04-14 14:49 ` [Resend RFC PATCH V2 03/12] x86/Hyper-V: Add new hvcall guest address host visibility support Tianyu Lan
2021-04-14 15:40   ` Christoph Hellwig
2021-04-15  8:13     ` Tianyu Lan
2021-04-14 14:49 ` [Resend RFC PATCH V2 04/12] HV: Add Write/Read MSR registers via ghcb Tianyu Lan
2021-04-14 15:41   ` Christoph Hellwig
2021-04-15  8:19     ` Tianyu Lan
2021-04-15 18:11   ` Konrad Rzeszutek Wilk
2021-04-14 14:49 ` [Resend RFC PATCH V2 05/12] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-04-14 14:49 ` [Resend RFC PATCH V2 06/12] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-04-15 18:52   ` Konrad Rzeszutek Wilk
2021-04-14 14:49 ` [Resend RFC PATCH V2 07/12] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-04-15 20:24   ` Konrad Rzeszutek Wilk
2021-04-19  6:36     ` Christoph Hellwig
2021-04-14 14:49 ` [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM Tianyu Lan
2021-04-14 15:42   ` Christoph Hellwig
2021-04-14 15:45   ` Greg KH
2021-04-14 16:17     ` Stephen Hemminger
2021-04-15 12:54       ` Tianyu Lan
2021-04-15 13:09     ` Tianyu Lan
2021-04-14 14:49 ` [Resend RFC PATCH V2 09/12] swiotlb: Add bounce buffer remap address setting function Tianyu Lan
2021-04-15 20:28   ` Konrad Rzeszutek Wilk
2021-04-14 14:49 ` [Resend RFC PATCH V2 10/12] HV/IOMMU: Add Hyper-V dma ops support Tianyu Lan
2021-04-14 15:47   ` Christoph Hellwig
2021-05-12 16:01     ` Tianyu Lan
2021-05-12 17:29       ` Robin Murphy
2021-05-13  3:19       ` Lu Baolu
2021-04-14 14:49 ` [Resend RFC PATCH V2 11/12] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-04-14 15:50   ` Christoph Hellwig
2021-04-15  8:39     ` Tianyu Lan
2021-04-14 14:49 ` [Resend RFC PATCH V2 12/12] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-04-14 15:51   ` Christoph Hellwig

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