From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
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m.szyprowski@samsung.com, robin.murphy@arm.com,
kirill.shutemov@linux.intel.com, akpm@linux-foundation.org,
rppt@kernel.org, Tianyu.Lan@microsoft.com,
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Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
vkuznets@redhat.com, brijesh.singh@amd.com,
anparri@microsoft.com
Subject: [Resend RFC PATCH V4 01/13] x86/HV: Initialize GHCB page in Isolation VM
Date: Wed, 7 Jul 2021 11:46:15 -0400 [thread overview]
Message-ID: <20210707154629.3977369-2-ltykernel@gmail.com> (raw)
In-Reply-To: <20210707154629.3977369-1-ltykernel@gmail.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest
to communicate with hypervisor. Map GHCB page for all
cpus to read/write MSR register and submit hvcall request
via GHCB.
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
arch/x86/hyperv/hv_init.c | 64 ++++++++++++++++++++++++++++++---
arch/x86/include/asm/mshyperv.h | 2 ++
include/asm-generic/mshyperv.h | 2 ++
3 files changed, 64 insertions(+), 4 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index b756b2866deb..e058f72eeee5 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -20,6 +20,7 @@
#include <linux/kexec.h>
#include <linux/version.h>
#include <linux/vmalloc.h>
+#include <linux/io.h>
#include <linux/mm.h>
#include <linux/hyperv.h>
#include <linux/slab.h>
@@ -54,6 +55,26 @@ EXPORT_SYMBOL_GPL(hyperv_pcpu_output_arg);
u32 hv_max_vp_index;
EXPORT_SYMBOL_GPL(hv_max_vp_index);
+static int hyperv_init_ghcb(void)
+{
+ u64 ghcb_gpa;
+ void *ghcb_va;
+ void **ghcb_base;
+
+ if (!ms_hyperv.ghcb_base)
+ return -EINVAL;
+
+ rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
+ ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB);
+ if (!ghcb_va)
+ return -ENOMEM;
+
+ ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
+ *ghcb_base = ghcb_va;
+
+ return 0;
+}
+
static int hv_cpu_init(unsigned int cpu)
{
u64 msr_vp_index;
@@ -106,6 +127,8 @@ static int hv_cpu_init(unsigned int cpu)
wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val);
}
+ hyperv_init_ghcb();
+
return 0;
}
@@ -201,6 +224,7 @@ static int hv_cpu_die(unsigned int cpu)
unsigned long flags;
void **input_arg;
void *pg;
+ void **ghcb_va = NULL;
local_irq_save(flags);
input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg);
@@ -214,6 +238,13 @@ static int hv_cpu_die(unsigned int cpu)
*output_arg = NULL;
}
+ if (ms_hyperv.ghcb_base) {
+ ghcb_va = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
+ if (*ghcb_va)
+ memunmap(*ghcb_va);
+ *ghcb_va = NULL;
+ }
+
local_irq_restore(flags);
free_pages((unsigned long)pg, hv_root_partition ? 1 : 0);
@@ -410,9 +441,22 @@ void __init hyperv_init(void)
VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX,
VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
__builtin_return_address(0));
- if (hv_hypercall_pg == NULL) {
- wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
- goto remove_cpuhp_state;
+ if (hv_hypercall_pg == NULL)
+ goto clean_guest_os_id;
+
+ if (hv_isolation_type_snp()) {
+ ms_hyperv.ghcb_base = alloc_percpu(void *);
+ if (!ms_hyperv.ghcb_base)
+ goto clean_guest_os_id;
+
+ if (hyperv_init_ghcb()) {
+ free_percpu(ms_hyperv.ghcb_base);
+ ms_hyperv.ghcb_base = NULL;
+ goto clean_guest_os_id;
+ }
+
+ /* Hyper-V requires to write guest os id via ghcb in SNP IVM. */
+ hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, guest_id);
}
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
@@ -473,7 +517,8 @@ void __init hyperv_init(void)
hv_query_ext_cap(0);
return;
-remove_cpuhp_state:
+clean_guest_os_id:
+ wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
cpuhp_remove_state(cpuhp);
free_vp_assist_page:
kfree(hv_vp_assist_page);
@@ -502,6 +547,9 @@ void hyperv_cleanup(void)
*/
hv_hypercall_pg = NULL;
+ if (ms_hyperv.ghcb_base)
+ free_percpu(ms_hyperv.ghcb_base);
+
/* Reset the hypercall page */
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
@@ -586,6 +634,14 @@ bool hv_is_isolation_supported(void)
}
EXPORT_SYMBOL_GPL(hv_is_isolation_supported);
+DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
+
+bool hv_isolation_type_snp(void)
+{
+ return static_branch_unlikely(&isolation_type_snp);
+}
+EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
+
/* Bit mask of the extended capability to query: see HV_EXT_CAPABILITY_xxx */
bool hv_query_ext_cap(u64 cap_query)
{
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 67ff0d637e55..aeacca7c4da8 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -11,6 +11,8 @@
#include <asm/paravirt.h>
#include <asm/mshyperv.h>
+DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
+
typedef int (*hyperv_fill_flush_list_func)(
struct hv_guest_mapping_flush_list *flush,
void *data);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 9a000ba2bb75..3ae56a29594f 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -35,6 +35,7 @@ struct ms_hyperv_info {
u32 max_lp_index;
u32 isolation_config_a;
u32 isolation_config_b;
+ void __percpu **ghcb_base;
};
extern struct ms_hyperv_info ms_hyperv;
@@ -224,6 +225,7 @@ bool hv_is_hyperv_initialized(void);
bool hv_is_hibernation_supported(void);
enum hv_isolation_type hv_get_isolation_type(void);
bool hv_is_isolation_supported(void);
+bool hv_isolation_type_snp(void);
void hyperv_cleanup(void);
bool hv_query_ext_cap(u64 cap_query);
#else /* CONFIG_HYPERV */
--
2.25.1
next prev parent reply other threads:[~2021-07-07 15:46 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 15:46 [Resend RFC PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-07-07 15:46 ` Tianyu Lan [this message]
2021-07-07 15:46 ` [Resend RFC PATCH V4 02/13] x86/HV: Initialize shared memory boundary in the Isolation VM Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 03/13] x86/HV: Add new hvcall guest address host visibility support Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 04/13] HV: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 05/13] HV: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 06/13] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 07/13] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 08/13] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 09/13] x86/Swiotlb/HV: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-07-20 10:42 ` Tianyu Lan
2021-07-20 13:54 ` Christoph Hellwig
2021-07-21 10:28 ` Tianyu Lan
2021-07-21 14:33 ` Christoph Hellwig
2021-07-21 15:11 ` Tianyu Lan
2021-08-13 16:43 ` Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 10/13] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 11/13] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 12/13] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-07-07 15:46 ` [Resend RFC PATCH V4 13/13] x86/HV: Not set memory decrypted/encrypted during kexec alloc/free page in IVM Tianyu Lan
2021-07-07 16:14 ` Dave Hansen
2021-07-08 13:54 ` Tianyu Lan
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