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,
x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com,
luto@kernel.org, peterz@infradead.org, davem@davemloft.net,
kuba@kernel.org, gregkh@linuxfoundation.org, arnd@arndb.de,
brijesh.singh@amd.com, jroedel@suse.de, mikelley@microsoft.com,
Tianyu.Lan@microsoft.com, thomas.lendacky@amd.com,
pgonda@google.com, akpm@linux-foundation.org, rppt@kernel.org,
kirill.shutemov@linux.intel.com, saravanand@fb.com,
aneesh.kumar@linux.ibm.com, sfr@canb.auug.org.au,
david@redhat.com, michael.h.kelley@microsoft.com
Cc: linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
vkuznets@redhat.com, konrad.wilk@oracle.com, hch@lst.de,
robin.murphy@arm.com, joro@8bytes.org, parri.andrea@gmail.com,
dave.hansen@intel.com
Subject: [PATCH V9 9/9] Drivers: hv : vmbus: Initialize VMbus ring buffer for Isolation VM
Date: Mon, 25 Oct 2021 08:21:14 -0400 [thread overview]
Message-ID: <20211025122116.264793-10-ltykernel@gmail.com> (raw)
In-Reply-To: <20211025122116.264793-1-ltykernel@gmail.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
VMbus ring buffer are shared with host and it's need to
be accessed via extra address space of Isolation VM with
AMD SNP support. This patch is to map the ring buffer
address in extra address space via vmap_pfn(). Hyperv set
memory host visibility hvcall smears data in the ring buffer
and so reset the ring buffer memory to zero after mapping.
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
Change since v4:
* Use PFN_DOWN instead of HVPFN_DOWN in the hv_ringbuffer_init()
Change since v3:
* Remove hv_ringbuffer_post_init(), merge map
operation for Isolation VM into hv_ringbuffer_init()
* Call hv_ringbuffer_init() after __vmbus_establish_gpadl().
---
drivers/hv/Kconfig | 1 +
drivers/hv/channel.c | 19 +++++++-------
drivers/hv/ring_buffer.c | 55 ++++++++++++++++++++++++++++++----------
3 files changed, 53 insertions(+), 22 deletions(-)
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index d1123ceb38f3..dd12af20e467 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -8,6 +8,7 @@ config HYPERV
|| (ARM64 && !CPU_BIG_ENDIAN))
select PARAVIRT
select X86_HV_CALLBACK_VECTOR if X86
+ select VMAP_PFN
help
Select this option to run Linux as a Hyper-V client operating
system.
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index b37ff4a39224..dc5c35210c16 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -683,15 +683,6 @@ static int __vmbus_open(struct vmbus_channel *newchannel,
if (!newchannel->max_pkt_size)
newchannel->max_pkt_size = VMBUS_DEFAULT_MAX_PKT_SIZE;
- err = hv_ringbuffer_init(&newchannel->outbound, page, send_pages, 0);
- if (err)
- goto error_clean_ring;
-
- err = hv_ringbuffer_init(&newchannel->inbound, &page[send_pages],
- recv_pages, newchannel->max_pkt_size);
- if (err)
- goto error_clean_ring;
-
/* Establish the gpadl for the ring buffer */
newchannel->ringbuffer_gpadlhandle.gpadl_handle = 0;
@@ -703,6 +694,16 @@ static int __vmbus_open(struct vmbus_channel *newchannel,
if (err)
goto error_clean_ring;
+ err = hv_ringbuffer_init(&newchannel->outbound,
+ page, send_pages, 0);
+ if (err)
+ goto error_free_gpadl;
+
+ err = hv_ringbuffer_init(&newchannel->inbound, &page[send_pages],
+ recv_pages, newchannel->max_pkt_size);
+ if (err)
+ goto error_free_gpadl;
+
/* Create and init the channel open message */
open_info = kzalloc(sizeof(*open_info) +
sizeof(struct vmbus_channel_open_channel),
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 314015d9e912..931802ae985c 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -17,6 +17,8 @@
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/prefetch.h>
+#include <linux/io.h>
+#include <asm/mshyperv.h>
#include "hyperv_vmbus.h"
@@ -183,8 +185,10 @@ void hv_ringbuffer_pre_init(struct vmbus_channel *channel)
int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
struct page *pages, u32 page_cnt, u32 max_pkt_size)
{
- int i;
struct page **pages_wraparound;
+ unsigned long *pfns_wraparound;
+ u64 pfn;
+ int i;
BUILD_BUG_ON((sizeof(struct hv_ring_buffer) != PAGE_SIZE));
@@ -192,23 +196,48 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
* First page holds struct hv_ring_buffer, do wraparound mapping for
* the rest.
*/
- pages_wraparound = kcalloc(page_cnt * 2 - 1, sizeof(struct page *),
- GFP_KERNEL);
- if (!pages_wraparound)
- return -ENOMEM;
+ if (hv_isolation_type_snp()) {
+ pfn = page_to_pfn(pages) +
+ PFN_DOWN(ms_hyperv.shared_gpa_boundary);
+
+ pfns_wraparound = kcalloc(page_cnt * 2 - 1,
+ sizeof(unsigned long), GFP_KERNEL);
+ if (!pfns_wraparound)
+ return -ENOMEM;
+
+ pfns_wraparound[0] = pfn;
+ for (i = 0; i < 2 * (page_cnt - 1); i++)
+ pfns_wraparound[i + 1] = pfn + i % (page_cnt - 1) + 1;
- pages_wraparound[0] = pages;
- for (i = 0; i < 2 * (page_cnt - 1); i++)
- pages_wraparound[i + 1] = &pages[i % (page_cnt - 1) + 1];
+ ring_info->ring_buffer = (struct hv_ring_buffer *)
+ vmap_pfn(pfns_wraparound, page_cnt * 2 - 1,
+ PAGE_KERNEL);
+ kfree(pfns_wraparound);
- ring_info->ring_buffer = (struct hv_ring_buffer *)
- vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, PAGE_KERNEL);
+ if (!ring_info->ring_buffer)
+ return -ENOMEM;
+
+ /* Zero ring buffer after setting memory host visibility. */
+ memset(ring_info->ring_buffer, 0x00, PAGE_SIZE * page_cnt);
+ } else {
+ pages_wraparound = kcalloc(page_cnt * 2 - 1,
+ sizeof(struct page *),
+ GFP_KERNEL);
+
+ pages_wraparound[0] = pages;
+ for (i = 0; i < 2 * (page_cnt - 1); i++)
+ pages_wraparound[i + 1] =
+ &pages[i % (page_cnt - 1) + 1];
- kfree(pages_wraparound);
+ ring_info->ring_buffer = (struct hv_ring_buffer *)
+ vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP,
+ PAGE_KERNEL);
+ kfree(pages_wraparound);
+ if (!ring_info->ring_buffer)
+ return -ENOMEM;
+ }
- if (!ring_info->ring_buffer)
- return -ENOMEM;
ring_info->ring_buffer->read_index =
ring_info->ring_buffer->write_index = 0;
--
2.25.1
next prev parent reply other threads:[~2021-10-25 12:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 12:21 [PATCH V9 0/9] x86/Hyper-V: Add Hyper-V Isolation VM support(First part) Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 1/9] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 2/9] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 3/9] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 4/9] Drivers: hv: vmbus: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 5/9] x86/sev-es: Expose sev_es_ghcb_hv_call() to call ghcb hv call out of sev code Tianyu Lan
2021-10-25 16:34 ` [tip: x86/sev] x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV tip-bot2 for Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 6/9] x86/hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 7/9] x86/hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-10-25 12:21 ` [PATCH V9 8/9] Drivers: hv: vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-10-25 12:21 ` Tianyu Lan [this message]
2021-10-25 20:55 ` [PATCH V9 0/9] x86/Hyper-V: Add Hyper-V Isolation VM support(First part) Wei Liu
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