diff mbox series

[RFC,V4,01/12] x86/HV: Initialize shared memory boundary in the Isolation VM.

Message ID 20210707153456.3976348-2-ltykernel@gmail.com
State Superseded
Headers show
Series x86/Hyper-V: Add Hyper-V Isolation VM support | expand

Commit Message

Tianyu Lan July 7, 2021, 3:34 p.m. UTC 
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 SNP guest.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c |  2 ++
 include/asm-generic/mshyperv.h | 12 +++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

Comments

Olaf Hering July 8, 2021, 7:34 a.m. UTC | #1 
On Wed, Jul 07, Tianyu Lan wrote:

> +++ b/include/asm-generic/mshyperv.h
> @@ -34,8 +34,18 @@ struct ms_hyperv_info {

>  	void  __percpu **ghcb_base;

It would be cool if the cover letter states which commit id this series is based on.

Thanks,
Olaf
Tianyu Lan July 8, 2021, 2:40 p.m. UTC | #2 
Hi Olaf:

On 7/8/2021 3:34 PM, Olaf Hering wrote:
> On Wed, Jul 07, Tianyu Lan wrote:

> 

>> +++ b/include/asm-generic/mshyperv.h

>> @@ -34,8 +34,18 @@ struct ms_hyperv_info {

> 

>>   	void  __percpu **ghcb_base;

> 

> It would be cool if the cover letter states which commit id this series is based on.


Thanks for your reminder. I will add this in the later version.
This patchset is rebased on Hyper-V next branch with Swiotlb 
“Restricted DMA“ patches from Claire Chang <tientzu@chromium.org>
 
https://lore.kernel.org/lkml/20210624155526.2775863-1-tientzu@chromium.org/
diff mbox series

Patch

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 10b2a8c10cb6..8aed689db621 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -334,6 +334,8 @@  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 =
+			(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 3ae56a29594f..2914e27b0429 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -34,8 +34,18 @@  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;