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BY2PR12MB0661; 20:SJrajXDgGdVP8Guq1KJxT3mhN0ZjL0G88hGD/4l5S0tPcWMO8X3zhmMBW1dEtjWOedM8duHHK8boLplLAqoGCUjcOHB37YC3V8seh3w0kIMQga3zkw9KI4KicprCdNEIBNTiMuD+d5AfF6lVYFlOg6Tn0e/62NpjWqNwWelv8P8nIdJlVXDVSd4FjCWvQ6hy5pau0YGuXpKAX2NHeIBNm7pEmCt8jnQeECl4RGQNukFCJ5Ks4Ld6cm31sprZ+W2x X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Sep 2016 14:54:00.1876 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR12MB0661 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.33.71 Subject: [Qemu-devel] [RFC PATCH v2 12/16] sev: add DEBUG_DECRYPT command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 --- 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