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[Qemu-devel] [PATCH v7 21/26] sev: add debug encrypt and decrypt command
From: |
Brijesh Singh |
Subject: |
[Qemu-devel] [PATCH v7 21/26] sev: add debug encrypt and decrypt commands |
Date: |
Wed, 7 Feb 2018 10:06:33 -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 | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++
accel/kvm/trace-events | 1 +
include/sysemu/sev.h | 1 +
4 files changed, 75 insertions(+)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 37f7c442dc3f..7d3b7b4107eb 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 e422f43caa0b..7b57575e2f93 100644
--- a/accel/kvm/sev.c
+++ b/accel/kvm/sev.c
@@ -23,11 +23,13 @@
#define DEFAULT_GUEST_POLICY 0x1 /* disable debug */
#define DEFAULT_SEV_DEVICE "/dev/sev"
+#define GUEST_POLICY_DBG_BIT 0x1
static uint64_t me_mask;
static bool sev_active;
static int sev_fd;
static SEVState *sev_state;
+static MemoryRegionRAMReadWriteOps sev_ops;
#define SEV_FW_MAX_ERROR 0x17
@@ -575,6 +577,51 @@ 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;
+
+ trace_kvm_sev_debug(write ? "encrypt" : "decrypt", src, dst, 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)
{
@@ -651,6 +698,31 @@ 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/accel/kvm/trace-events b/accel/kvm/trace-events
index e810d75ea1b3..de6a12c51e06 100644
--- a/accel/kvm/trace-events
+++ b/accel/kvm/trace-events
@@ -22,3 +22,4 @@ kvm_sev_launch_start(int policy, void *session, void *pdh)
"policy 0x%x session
kvm_sev_launch_update_data(void *addr, uint64_t len) "addr %p len 0x%" PRIu64
kvm_sev_launch_measurement(const char *value) "data %s"
kvm_sev_launch_finish(void) ""
+kvm_sev_debug(const char *op, const uint8_t *src, uint8_t *dst, int len) "(%s)
src %p dst %p len %d"
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index c173ad33f8bb..186ebca0f945 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -78,6 +78,7 @@ 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
--
2.14.3
- Re: [Qemu-devel] [PATCH v7 13/26] qmp: add query-sev command, (continued)
- [Qemu-devel] [PATCH v7 14/26] hmp: add 'info sev' command, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 17/26] target/i386: encrypt bios rom, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 19/26] sev: Finalize the SEV guest launch flow, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 22/26] target/i386: clear C-bit when walking SEV guest page table, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 16/26] sev: add command to encrypt guest memory region, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 15/26] sev: add command to create launch memory encryption context, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 18/26] sev: add support to LAUNCH_MEASURE command, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 20/26] hw: i386: set ram_debug_ops when memory encryption is enabled, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 12/26] kvm: introduce memory encryption APIs, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 21/26] sev: add debug encrypt and decrypt commands,
Brijesh Singh <=
- [Qemu-devel] [PATCH v7 23/26] include: add psp-sev.h header file, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 25/26] sev: add support to KVM_SEV_GUEST_STATUS, Brijesh Singh, 2018/02/07
- [Qemu-devel] [PATCH v7 26/26] qmp: add query-sev-launch-measure command, Brijesh Singh, 2018/02/07