From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
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tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
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Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
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Subject: [RFC PATCH V4 03/12] HV: Mark vmbus ring buffer visible to host in Isolation VM
Date: Wed, 7 Jul 2021 11:34:44 -0400 [thread overview]
Message-ID: <20210707153456.3976348-4-ltykernel@gmail.com> (raw)
In-Reply-To: <20210707153456.3976348-1-ltykernel@gmail.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
Mark vmbus ring buffer visible with set_memory_decrypted() when
establish gpadl handle.
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
drivers/hv/channel.c | 38 ++++++++++++++++++++++++++++++++++++--
include/linux/hyperv.h | 10 ++++++++++
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index f3761c73b074..01048bb07082 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -17,6 +17,7 @@
#include <linux/hyperv.h>
#include <linux/uio.h>
#include <linux/interrupt.h>
+#include <linux/set_memory.h>
#include <asm/page.h>
#include <asm/mshyperv.h>
@@ -465,7 +466,7 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
struct list_head *curr;
u32 next_gpadl_handle;
unsigned long flags;
- int ret = 0;
+ int ret = 0, index;
next_gpadl_handle =
(atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
@@ -474,6 +475,13 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
if (ret)
return ret;
+ ret = set_memory_decrypted((unsigned long)kbuffer,
+ HVPFN_UP(size));
+ if (ret) {
+ pr_warn("Failed to set host visibility.\n");
+ return ret;
+ }
+
init_completion(&msginfo->waitevent);
msginfo->waiting_channel = channel;
@@ -539,6 +547,15 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
/* At this point, we received the gpadl created msg */
*gpadl_handle = gpadlmsg->gpadl;
+ if (type == HV_GPADL_BUFFER)
+ index = 0;
+ else
+ index = channel->gpadl_range[1].gpadlhandle ? 2 : 1;
+
+ channel->gpadl_range[index].size = size;
+ channel->gpadl_range[index].buffer = kbuffer;
+ channel->gpadl_range[index].gpadlhandle = *gpadl_handle;
+
cleanup:
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_del(&msginfo->msglistentry);
@@ -549,6 +566,11 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
}
kfree(msginfo);
+
+ if (ret)
+ set_memory_encrypted((unsigned long)kbuffer,
+ HVPFN_UP(size));
+
return ret;
}
@@ -811,7 +833,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
struct vmbus_channel_gpadl_teardown *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
- int ret;
+ int ret, i;
info = kzalloc(sizeof(*info) +
sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
@@ -859,6 +881,18 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
kfree(info);
+
+ /* Find gpadl buffer virtual address and size. */
+ for (i = 0; i < VMBUS_GPADL_RANGE_COUNT; i++)
+ if (channel->gpadl_range[i].gpadlhandle == gpadl_handle)
+ break;
+
+ if (set_memory_encrypted((unsigned long)channel->gpadl_range[i].buffer,
+ HVPFN_UP(channel->gpadl_range[i].size)))
+ pr_warn("Fail to set mem host visibility.\n");
+
+ channel->gpadl_range[i].gpadlhandle = 0;
+
return ret;
}
EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2e859d2f9609..06eccaba10c5 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -809,6 +809,14 @@ struct vmbus_device {
#define VMBUS_DEFAULT_MAX_PKT_SIZE 4096
+struct vmbus_gpadl_range {
+ u32 gpadlhandle;
+ u32 size;
+ void *buffer;
+};
+
+#define VMBUS_GPADL_RANGE_COUNT 3
+
struct vmbus_channel {
struct list_head listentry;
@@ -829,6 +837,8 @@ struct vmbus_channel {
struct completion rescind_event;
u32 ringbuffer_gpadlhandle;
+ /* GPADL_RING and Send/Receive GPADL_BUFFER. */
+ struct vmbus_gpadl_range gpadl_range[VMBUS_GPADL_RANGE_COUNT];
/* Allocated memory for ring buffer */
struct page *ringbuffer_page;
--
2.25.1
next prev parent reply other threads:[~2021-07-07 15:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 15:34 [RFC PATCH V4 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 01/12] x86/HV: Initialize shared memory boundary in the Isolation VM Tianyu Lan
2021-07-08 7:34 ` Olaf Hering
2021-07-08 14:40 ` Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 02/12] x86/HV: Add new hvcall guest address host visibility support Tianyu Lan
2021-07-07 15:34 ` Tianyu Lan [this message]
2021-07-07 15:34 ` [RFC PATCH V4 04/12] HV: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 05/12] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 06/12] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 07/12] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 08/12] x86/Swiotlb/HV: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 09/12] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 10/12] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 11/12] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-07-07 15:34 ` [RFC PATCH V4 12/12] x86/HV: Not set memory decrypted/encrypted during kexec alloc/free page in IVM Tianyu Lan
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