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 01/12] x86/HV: Initialize GHCB page in Isolation VM
Date: Wed, 14 Apr 2021 10:49:34 -0400 [thread overview]
Message-ID: <20210414144945.3460554-2-ltykernel@gmail.com> (raw)
In-Reply-To: <20210414144945.3460554-1-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 | 52 +++++++++++++++++++++++++++++++---
include/asm-generic/mshyperv.h | 1 +
2 files changed, 49 insertions(+), 4 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 0db5137d5b81..90e65fbf4c58 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -82,6 +82,9 @@ static int hv_cpu_init(unsigned int cpu)
struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()];
void **input_arg;
struct page *pg;
+ u64 ghcb_gpa;
+ void *ghcb_va;
+ void **ghcb_base;
/* hv_cpu_init() can be called with IRQs disabled from hv_resume() */
pg = alloc_pages(irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL, hv_root_partition ? 1 : 0);
@@ -128,6 +131,17 @@ static int hv_cpu_init(unsigned int cpu)
wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val);
}
+ if (ms_hyperv.ghcb_base) {
+ rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
+
+ ghcb_va = ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE);
+ if (!ghcb_va)
+ return -ENOMEM;
+
+ ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
+ *ghcb_base = ghcb_va;
+ }
+
return 0;
}
@@ -223,6 +237,7 @@ 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);
@@ -236,6 +251,13 @@ 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)
+ iounmap(*ghcb_va);
+ *ghcb_va = NULL;
+ }
+
local_irq_restore(flags);
free_pages((unsigned long)pg, hv_root_partition ? 1 : 0);
@@ -372,6 +394,9 @@ void __init hyperv_init(void)
u64 guest_id, required_msrs;
union hv_x64_msr_hypercall_contents hypercall_msr;
int cpuhp, i;
+ u64 ghcb_gpa;
+ void *ghcb_va;
+ void **ghcb_base;
if (x86_hyper_type != X86_HYPER_MS_HYPERV)
return;
@@ -432,9 +457,24 @@ 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;
+
+ rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
+ ghcb_va = ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE);
+ if (!ghcb_va) {
+ free_percpu(ms_hyperv.ghcb_base);
+ ms_hyperv.ghcb_base = NULL;
+ goto clean_guest_os_id;
+ }
+
+ ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base);
+ *ghcb_base = ghcb_va;
}
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
@@ -499,7 +539,8 @@ void __init hyperv_init(void)
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);
@@ -528,6 +569,9 @@ 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);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index dff58a3db5d5..c6f4c5c20fb8 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;
--
2.25.1
next prev parent reply other threads:[~2021-04-14 14:50 UTC|newest]
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 ` Tianyu Lan [this message]
2021-04-14 14:49 ` [Resend RFC PATCH V2 02/12] x86/HV: Initialize shared memory boundary in Isolation VM Tianyu Lan
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210414144945.3460554-2-ltykernel@gmail.com \
--to=ltykernel@gmail.com \
--cc=Tianyu.Lan@microsoft.com \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=bp@alien8.de \
--cc=brijesh.singh@amd.com \
--cc=davem@davemloft.net \
--cc=gregkh@linuxfoundation.org \
--cc=haiyangz@microsoft.com \
--cc=hch@lst.de \
--cc=hpa@zytor.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jejb@linux.ibm.com \
--cc=joro@8bytes.org \
--cc=konrad.wilk@oracle.com \
--cc=kuba@kernel.org \
--cc=kys@microsoft.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-scsi@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=martin.petersen@oracle.com \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=robin.murphy@arm.com \
--cc=sthemmin@microsoft.com \
--cc=sunilmut@microsoft.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=vkuznets@redhat.com \
--cc=wei.liu@kernel.org \
--cc=will@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).