From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> To: Brijesh Singh <brijesh.singh@amd.com> Cc: Peter Maydell <peter.maydell@linaro.org>, kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>, "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>, Markus Armbruster <armbru@redhat.com>, Bruce Rogers <brogers@suse.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Marcel Apfelbaum <marcel@redhat.com>, Borislav Petkov <bp@suse.de>, Thomas Lendacky <Thomas.Lendacky@amd.com>, Eduardo Habkost <ehabkost@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Alistair Francis <alistair.francis@xilinx.com>, Cornelia Huck <cornelia.huck@de.ibm.com>, Richard Henderson <rth@twiddle.net>, Peter Crosthwaite <crosthwaite.peter@gmail.com>, Paolo Bonzini <pbonzini@redhat.com> Subject: Re: [PATCH v11 21/28] sev/i386: add debug encrypt and decrypt commands Date: Wed, 7 Mar 2018 17:27:04 +0000 [thread overview] Message-ID: <20180307172703.GH3089@work-vm> (raw) In-Reply-To: <20180307165038.88640-22-brijesh.singh@amd.com> * Brijesh Singh (brijesh.singh@amd.com) wrote: > 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 <pbonzini@redhat.com> > Cc: Richard Henderson <rth@twiddle.net> > Cc: Eduardo Habkost <ehabkost@redhat.com> > Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> > --- > accel/kvm/kvm-all.c | 1 + > stubs/sev.c | 4 ++++ > target/i386/sev.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ > target/i386/trace-events | 1 + > 4 files changed, 63 insertions(+) > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c > index 411aa87719e6..8089173491dd 100644 > --- a/accel/kvm/kvm-all.c > +++ b/accel/kvm/kvm-all.c > @@ -1682,6 +1682,7 @@ 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/stubs/sev.c b/stubs/sev.c > index 2e20f3b73a5b..73f5c7f93a67 100644 > --- a/stubs/sev.c > +++ b/stubs/sev.c > @@ -15,6 +15,10 @@ > #include "qemu-common.h" > #include "sysemu/sev.h" > > +void sev_set_debug_ops(void *handle, MemoryRegion *mr) > +{ > +} > + > int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) > { > return 1; > diff --git a/target/i386/sev.c b/target/i386/sev.c > index 5fbb3105ccd4..bcfc09558c8c 100644 > --- a/target/i386/sev.c > +++ b/target/i386/sev.c > @@ -24,6 +24,7 @@ > #define DEFAULT_SEV_DEVICE "/dev/sev" > > static SEVState *sev_state; > +static MemoryRegionRAMReadWriteOps sev_ops; > > static const char *const sev_fw_errlist[] = { > "", > @@ -601,6 +602,46 @@ 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.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(sev_state->sev_fd, > + 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)); > + } > + > + 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) > { > @@ -701,6 +742,22 @@ sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) > return 0; > } > > +void > +sev_set_debug_ops(void *handle, MemoryRegion *mr) > +{ > + SEVState *s = (SEVState *)handle; > + > + /* If policy does not allow debug then no need to register ops */ > + if (s->policy & SEV_POLICY_NODBG) { > + return; > + } So what happens if someone tries to use a gdb or monitor command when policy didn't allow debug? Does it end up with an obvious error somehow? Dave > + 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/target/i386/trace-events b/target/i386/trace-events > index b1fbde6e40fe..00aa6e98d810 100644 > --- a/target/i386/trace-events > +++ b/target/i386/trace-events > @@ -15,3 +15,4 @@ 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" > -- > 2.14.3 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
WARNING: multiple messages have this Message-ID (diff)
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> To: Brijesh Singh <brijesh.singh@amd.com> Cc: qemu-devel@nongnu.org, Alistair Francis <alistair.francis@xilinx.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Cornelia Huck <cornelia.huck@de.ibm.com>, "Daniel P . Berrange" <berrange@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>, Eduardo Habkost <ehabkost@redhat.com>, Eric Blake <eblake@redhat.com>, kvm@vger.kernel.org, Marcel Apfelbaum <marcel@redhat.com>, Markus Armbruster <armbru@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Peter Crosthwaite <crosthwaite.peter@gmail.com>, Peter Maydell <peter.maydell@linaro.org>, Richard Henderson <richard.henderson@linaro.org>, Stefan Hajnoczi <stefanha@gmail.com>, Thomas Lendacky <Thomas.Lendacky@amd.com>, Borislav Petkov <bp@suse.de>, Alexander Graf <agraf@suse.de>, Bruce Rogers <brogers@suse.com>, Richard Henderson <rth@twiddle.net> Subject: Re: [Qemu-devel] [PATCH v11 21/28] sev/i386: add debug encrypt and decrypt commands Date: Wed, 7 Mar 2018 17:27:04 +0000 [thread overview] Message-ID: <20180307172703.GH3089@work-vm> (raw) In-Reply-To: <20180307165038.88640-22-brijesh.singh@amd.com> * Brijesh Singh (brijesh.singh@amd.com) wrote: > 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 <pbonzini@redhat.com> > Cc: Richard Henderson <rth@twiddle.net> > Cc: Eduardo Habkost <ehabkost@redhat.com> > Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> > --- > accel/kvm/kvm-all.c | 1 + > stubs/sev.c | 4 ++++ > target/i386/sev.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ > target/i386/trace-events | 1 + > 4 files changed, 63 insertions(+) > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c > index 411aa87719e6..8089173491dd 100644 > --- a/accel/kvm/kvm-all.c > +++ b/accel/kvm/kvm-all.c > @@ -1682,6 +1682,7 @@ 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/stubs/sev.c b/stubs/sev.c > index 2e20f3b73a5b..73f5c7f93a67 100644 > --- a/stubs/sev.c > +++ b/stubs/sev.c > @@ -15,6 +15,10 @@ > #include "qemu-common.h" > #include "sysemu/sev.h" > > +void sev_set_debug_ops(void *handle, MemoryRegion *mr) > +{ > +} > + > int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) > { > return 1; > diff --git a/target/i386/sev.c b/target/i386/sev.c > index 5fbb3105ccd4..bcfc09558c8c 100644 > --- a/target/i386/sev.c > +++ b/target/i386/sev.c > @@ -24,6 +24,7 @@ > #define DEFAULT_SEV_DEVICE "/dev/sev" > > static SEVState *sev_state; > +static MemoryRegionRAMReadWriteOps sev_ops; > > static const char *const sev_fw_errlist[] = { > "", > @@ -601,6 +602,46 @@ 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.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(sev_state->sev_fd, > + 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)); > + } > + > + 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) > { > @@ -701,6 +742,22 @@ sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) > return 0; > } > > +void > +sev_set_debug_ops(void *handle, MemoryRegion *mr) > +{ > + SEVState *s = (SEVState *)handle; > + > + /* If policy does not allow debug then no need to register ops */ > + if (s->policy & SEV_POLICY_NODBG) { > + return; > + } So what happens if someone tries to use a gdb or monitor command when policy didn't allow debug? Does it end up with an obvious error somehow? Dave > + 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/target/i386/trace-events b/target/i386/trace-events > index b1fbde6e40fe..00aa6e98d810 100644 > --- a/target/i386/trace-events > +++ b/target/i386/trace-events > @@ -15,3 +15,4 @@ 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" > -- > 2.14.3 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2018-03-07 17:27 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-03-07 16:50 [PATCH v11 00/28] x86: Secure Encrypted Virtualization (AMD) Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 01/28] memattrs: add debug attribute Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 02/28] exec: add ram_debug_ops support Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 03/28] exec: add debug version of physical memory read and write API Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 04/28] monitor/i386: use debug APIs when accessing guest memory Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 05/28] machine: add -memory-encryption property Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 06/28] kvm: update kvm.h to include memory encryption ioctls Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 07/28] docs: add AMD Secure Encrypted Virtualization (SEV) Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 08/28] target/i386: add Secure Encrypted Virtulization (SEV) object Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 09/28] qmp: add query-sev command Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 10/28] include: add psp-sev.h header file Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 11/28] sev/i386: add command to initialize the memory encryption context Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 12/28] sev/i386: register the guest memory range which may contain encrypted data Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 13/28] kvm: introduce memory encryption APIs Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 14/28] hmp: add 'info sev' command Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 15/28] sev/i386: add command to create launch memory encryption context Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 16/28] sev/i386: add command to encrypt guest memory region Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 17/28] target/i386: encrypt bios rom Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 18/28] sev/i386: add support to LAUNCH_MEASURE command Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 19/28] sev/i386: finalize the SEV guest launch flow Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 20/28] hw/i386: set ram_debug_ops when memory encryption is enabled Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 21/28] sev/i386: add debug encrypt and decrypt commands Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 17:27 ` Dr. David Alan Gilbert [this message] 2018-03-07 17:27 ` Dr. David Alan Gilbert 2018-03-07 17:40 ` Brijesh Singh 2018-03-07 17:40 ` [Qemu-devel] " Brijesh Singh 2018-03-07 18:24 ` Dr. David Alan Gilbert 2018-03-07 18:24 ` [Qemu-devel] " Dr. David Alan Gilbert 2018-03-07 19:38 ` Brijesh Singh 2018-03-07 19:38 ` [Qemu-devel] " Brijesh Singh 2018-03-07 20:11 ` Dr. David Alan Gilbert 2018-03-07 20:11 ` [Qemu-devel] " Dr. David Alan Gilbert 2018-03-07 16:50 ` [PATCH v11 22/28] target/i386: clear C-bit when walking SEV guest page table Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 23/28] qmp: add query-sev-launch-measure command Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 24/28] sev/i386: add migration blocker Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 25/28] cpu/i386: populate CPUID 0x8000_001F when SEV is active Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 26/28] qmp: add query-sev-capabilities command Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 27/28] sev/i386: add sev_get_capabilities() Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 16:50 ` [PATCH v11 28/28] tests/qmp-test: blacklist sev specific qmp commands Brijesh Singh 2018-03-07 16:50 ` [Qemu-devel] " Brijesh Singh 2018-03-07 17:24 ` [PATCH v11 00/28] x86: Secure Encrypted Virtualization (AMD) no-reply 2018-03-07 17:24 ` [Qemu-devel] " no-reply 2018-03-07 20:35 ` Brijesh Singh 2018-03-07 20:35 ` [Qemu-devel] " Brijesh Singh 2018-03-08 1:10 ` Fam Zheng 2018-03-08 1:10 ` [Qemu-devel] " Fam Zheng
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