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[Qemu-devel] [PATCH v5 21/23] sev: add debug encrypt and decrypt command
From: |
Brijesh Singh |
Subject: |
[Qemu-devel] [PATCH v5 21/23] sev: add debug encrypt and decrypt commands |
Date: |
Wed, 6 Dec 2017 14:03:44 -0600 |
KVM_SEV_DBG_DECRYPT and KVM_SEV_DBG_ENCRYPT commands are used for
decrypting and encrypting guest memory region. The command works only if
the guest policy allows the debugging.
Cc: Paolo Bonzini <address@hidden>
Cc: address@hidden
Signed-off-by: Brijesh Singh <address@hidden>
---
accel/kvm/kvm-all.c | 1 +
accel/kvm/sev.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/sev.h | 1 +
3 files changed, 72 insertions(+)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index d35eebb97901..b069261de32a 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1677,6 +1677,7 @@ static int kvm_init(MachineState *ms)
}
kvm_state->memcrypt_encrypt_data = sev_encrypt_data;
+ kvm_state->memcrypt_debug_ops = sev_set_debug_ops;
}
ret = kvm_arch_init(ms, s);
diff --git a/accel/kvm/sev.c b/accel/kvm/sev.c
index fbbd99becc0a..3edfb5b08416 100644
--- a/accel/kvm/sev.c
+++ b/accel/kvm/sev.c
@@ -22,6 +22,7 @@
#define DEFAULT_GUEST_POLICY 0x1 /* disable debug */
#define DEFAULT_SEV_DEVICE "/dev/sev"
+#define GUEST_POLICY_DBG_BIT 0x1
#define DEBUG_SEV
#ifdef DEBUG_SEV
@@ -34,6 +35,7 @@
static int sev_fd;
static SEVState *sev_state;
+static MemoryRegionRAMReadWriteOps sev_ops;
#define SEV_FW_MAX_ERROR 0x17
@@ -483,6 +485,49 @@ sev_vm_state_change(void *opaque, int running, RunState
state)
}
}
+static int
+sev_dbg_enc_dec(uint8_t *dst, const uint8_t *src, uint32_t len, bool write)
+{
+ int ret, error;
+ struct kvm_sev_dbg *dbg;
+ dbg = g_malloc0(sizeof(*dbg));
+ if (!dbg) {
+ return 1;
+ }
+
+ dbg->src_uaddr = (unsigned long)src;
+ dbg->dst_uaddr = (unsigned long)dst;
+ dbg->len = len;
+
+ ret = sev_ioctl(write ? KVM_SEV_DBG_ENCRYPT : KVM_SEV_DBG_DECRYPT,
+ dbg, &error);
+ if (ret) {
+ error_report("%s (%s) %#llx->%#llx+%#x ret=%d fw_error=%d '%s'",
+ __func__, write ? "write" : "read", dbg->src_uaddr,
+ dbg->dst_uaddr, dbg->len, ret, error,
+ fw_error_to_str(error));
+ }
+
+ g_free(dbg);
+ return ret;
+}
+
+static int
+sev_mem_read(uint8_t *dst, const uint8_t *src, uint32_t len, MemTxAttrs attrs)
+{
+ assert(attrs.debug);
+
+ return sev_dbg_enc_dec(dst, src, len, false);
+}
+
+static int
+sev_mem_write(uint8_t *dst, const uint8_t *src, uint32_t len, MemTxAttrs attrs)
+{
+ assert(attrs.debug);
+
+ return sev_dbg_enc_dec(dst, src, len, true);
+}
+
void *
sev_guest_init(const char *id)
{
@@ -549,6 +594,31 @@ sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len)
return 0;
}
+void
+sev_set_debug_ops(void *handle, MemoryRegion *mr)
+{
+ int policy;
+ SEVState *s = (SEVState *)handle;
+
+ policy = object_property_get_int(OBJECT(s->sev_info),
+ "policy", &error_abort);
+
+ /*
+ * Check if guest policy supports debugging
+ * Bit 0 :
+ * 0 - debug allowed
+ * 1 - debug is not allowed
+ */
+ if (policy & GUEST_POLICY_DBG_BIT) {
+ return;
+ }
+
+ sev_ops.read = sev_mem_read;
+ sev_ops.write = sev_mem_write;
+
+ memory_region_set_ram_debug_ops(mr, &sev_ops);
+}
+
static void
sev_register_types(void)
{
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index 3af945935b60..7c50d33af4a9 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -71,6 +71,7 @@ typedef struct SEVState SEVState;
void *sev_guest_init(const char *id);
int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len);
+void sev_set_debug_ops(void *handle, MemoryRegion *mr);
#endif
--
2.9.5
- [Qemu-devel] [PATCH v5 11/23] sev: register the guest memory range which may contain encrypted data, (continued)
- [Qemu-devel] [PATCH v5 11/23] sev: register the guest memory range which may contain encrypted data, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 12/23] kvm: introduce memory encryption APIs, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 13/23] hmp: display memory encryption support in 'info kvm', Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 14/23] sev: add command to create launch memory encryption context, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 15/23] sev: add command to encrypt guest memory region, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 17/23] qapi: add SEV_MEASUREMENT event, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 16/23] target/i386: encrypt bios rom, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 18/23] sev: emit the SEV_MEASUREMENT event, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 19/23] sev: Finalize the SEV guest launch flow, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 20/23] hw: i386: set ram_debug_ops when memory encryption is enabled, Brijesh Singh, 2017/12/06
- [Qemu-devel] [PATCH v5 21/23] sev: add debug encrypt and decrypt commands,
Brijesh Singh <=
- [Qemu-devel] [PATCH v5 23/23] sev: add migration blocker, Brijesh Singh, 2017/12/06
- Re: [Qemu-devel] [PATCH v5 23/23] sev: add migration blocker, Brijesh Singh, 2017/12/07
[Qemu-devel] [PATCH v5 22/23] target/i386: clear C-bit when walking SEV guest page table, Brijesh Singh, 2017/12/06