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[Qemu-devel] [RFC PATCH v2 12/16] sev: add DEBUG_DECRYPT command
From: |
Brijesh Singh |
Subject: |
[Qemu-devel] [RFC PATCH v2 12/16] sev: add DEBUG_DECRYPT command |
Date: |
Thu, 22 Sep 2016 10:53:56 -0400 |
User-agent: |
StGit/0.17.1-dirty |
The command is used to decrypt a page of guest memory for debug.
See docs/amd-memory-encryption.txt for command parameters detail.
The command will be used by qemu monitor dump and gdbserver to access
the guest memory for debug purposes. A typical usage look like:
cpu_physical_memory_rw_debug
cpu_physical_memory_rw_debug_internal
sev_debug_decrypt
Signed-off-by: Brijesh Singh <address@hidden>
---
sev.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/sev.c b/sev.c
index 21c491c..c0f6ae4 100644
--- a/sev.c
+++ b/sev.c
@@ -1082,6 +1082,24 @@ sev_guest_launch_finish(void *handle)
}
static int
+sev_debug_decrypt(SEVState *s, uint8_t *dst, const uint8_t *src, uint32_t len)
+{
+ int ret;
+ struct kvm_sev_dbg_decrypt *dbg;
+
+ dbg = g_malloc0(sizeof(*dbg));
+ dbg->src_addr = (unsigned long)src;
+ dbg->dst_addr = (unsigned long)dst;
+ dbg->length = len;
+
+ ret = sev_ioctl(KVM_SEV_DBG_DECRYPT, dbg);
+ DPRINTF("SEV: DBG_DECRYPT src %#lx dst %#lx len %#x\n",
+ (uint64_t)src, (uint64_t)dst, len);
+ g_free(dbg);
+ return ret;
+}
+
+static int
sev_mem_write(uint8_t *dst, const uint8_t *src, uint32_t len, MemTxAttrs attrs)
{
SEVState *s = kvm_memory_encryption_get_handle();
@@ -1102,9 +1120,9 @@ sev_mem_read(uint8_t *dst, const uint8_t *src, uint32_t
len, MemTxAttrs attrs)
SEVState *s = kvm_memory_encryption_get_handle();
assert(s != NULL);
+ assert(attrs.debug || s->state != SEV_STATE_RUNNING);
- // fill in the code in next patches
- return 0;
+ return sev_debug_decrypt(s, dst, src, len);
}
void
[Qemu-devel] [RFC PATCH v2 07/16] hmp: display memory encryption support in 'info kvm', Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 08/16] core: loader: create memory encryption context before copying data, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 09/16] sev: add LAUNCH_START command, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 10/16] sev: add LAUNCH_UPDATE command, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 11/16] sev: add LAUNCH_FINISH command, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 12/16] sev: add DEBUG_DECRYPT command,
Brijesh Singh <=
[Qemu-devel] [RFC PATCH v2 13/16] sev: add DEBUG_ENCRYPT command, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 14/16] i386: set memory encryption ops for PC.BIOS and PC.RAM regions, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 15/16] target-i386: add cpuid Fn8000_001f, Brijesh Singh, 2016/09/22
[Qemu-devel] [RFC PATCH v2 16/16] i386: clear C-bit in SEV guest page table walk, Brijesh Singh, 2016/09/22
Re: [Qemu-devel] [RFC PATCH v2 00/16] x86: Secure Encrypted Virtualization (AMD), no-reply, 2016/09/22
Re: [Qemu-devel] [RFC PATCH v2 00/16] x86: Secure Encrypted Virtualization (AMD), no-reply, 2016/09/22