[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20221109205353.984745-12-ltykernel@gmail.com>
Date: Wed, 9 Nov 2022 15:53:46 -0500
From: Tianyu Lan <ltykernel@...il.com>
To: luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
hpa@...or.com, seanjc@...gle.com, pbonzini@...hat.com,
jgross@...e.com, tiala@...rosoft.com, kirill@...temov.name,
jiangshan.ljs@...group.com, peterz@...radead.org,
ashish.kalra@....com, srutherford@...gle.com,
akpm@...ux-foundation.org, anshuman.khandual@....com,
pawan.kumar.gupta@...ux.intel.com, adrian.hunter@...el.com,
daniel.sneddon@...ux.intel.com, alexander.shishkin@...ux.intel.com,
sandipan.das@....com, ray.huang@....com, brijesh.singh@....com,
michael.roth@....com, thomas.lendacky@....com,
venu.busireddy@...cle.com, sterritt@...gle.com,
tony.luck@...el.com, samitolvanen@...gle.com, fenghua.yu@...el.com
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org
Subject: [RFC PATCH 11/17] drivers: hv: Decrypt percpu hvcall input arg page in sev-snp enlightened guest
From: Tianyu Lan <tiala@...rosoft.com>
Hypervisor needs to access iput arg page and guest should decrypt
the page.
Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
drivers/hv/hv_common.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 2c6602571c47..c16961e686a0 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -21,6 +21,7 @@
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/dma-map-ops.h>
+#include <linux/set_memory.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
@@ -125,6 +126,7 @@ int hv_common_cpu_init(unsigned int cpu)
u64 msr_vp_index;
gfp_t flags;
int pgcount = hv_root_partition ? 2 : 1;
+ int ret;
/* hv_cpu_init() can be called with IRQs disabled from hv_resume() */
flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL;
@@ -134,6 +136,16 @@ int hv_common_cpu_init(unsigned int cpu)
if (!(*inputarg))
return -ENOMEM;
+ if (hv_isolation_type_en_snp()) {
+ ret = set_memory_decrypted((unsigned long)*inputarg, 1);
+ if (ret) {
+ kfree(*inputarg);
+ return ret;
+ }
+
+ memset(*inputarg, 0x00, PAGE_SIZE);
+ }
+
if (hv_root_partition) {
outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg);
*outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE;
@@ -168,6 +180,9 @@ int hv_common_cpu_die(unsigned int cpu)
local_irq_restore(flags);
+ if (hv_isolation_type_en_snp())
+ set_memory_encrypted((unsigned long)mem, 1);
+
kfree(mem);
return 0;
--
2.25.1
Powered by blists - more mailing lists