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From 760236b3633a8f532631256a899cab969e772196 Mon Sep 17 00:00:00 2001
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From: Janosch Frank <frankja@linux.ibm.com>
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Date: Mon, 17 Oct 2022 08:38:19 +0000
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Subject: [PATCH 38/42] s390x: Introduce PV query interface
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 226: s390: Enhanced Interpretation for PCI Functions and Secure Execution guest dump
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RH-Bugzilla: 1664378 2043909
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
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RH-Commit: [38/41] 3090615d81ec6b9e4c306f7fc3709e1935ff5a79
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Introduce an interface over which we can get information about UV data.
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
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Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
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Acked-by: Thomas Huth <thuth@redhat.com>
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Message-Id: <20221017083822.43118-8-frankja@linux.ibm.com>
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(cherry picked from commit 03d83ecfae46bf5e0074cb5808043b30df34064b)
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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 hw/s390x/pv.c              | 61 ++++++++++++++++++++++++++++++++++++++
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 hw/s390x/s390-virtio-ccw.c |  6 ++++
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 include/hw/s390x/pv.h      | 10 +++++++
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 3 files changed, 77 insertions(+)
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diff --git a/hw/s390x/pv.c b/hw/s390x/pv.c
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index 401b63d6cb..4c012f2eeb 100644
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--- a/hw/s390x/pv.c
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+++ b/hw/s390x/pv.c
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@@ -20,6 +20,11 @@
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 #include "exec/confidential-guest-support.h"
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 #include "hw/s390x/ipl.h"
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 #include "hw/s390x/pv.h"
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+#include "target/s390x/kvm/kvm_s390x.h"
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+
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+static bool info_valid;
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+static struct kvm_s390_pv_info_vm info_vm;
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+static struct kvm_s390_pv_info_dump info_dump;
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 static int __s390_pv_cmd(uint32_t cmd, const char *cmdname, void *data)
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 {
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@@ -56,6 +61,42 @@ static int __s390_pv_cmd(uint32_t cmd, const char *cmdname, void *data)
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     }                                  \
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 }
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+int s390_pv_query_info(void)
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+{
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+    struct kvm_s390_pv_info info = {
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+        .header.id = KVM_PV_INFO_VM,
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+        .header.len_max = sizeof(info.header) + sizeof(info.vm),
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+    };
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+    int rc;
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+
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+    /* Info API's first user is dump so they are bundled */
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+    if (!kvm_s390_get_protected_dump()) {
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+        return 0;
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+    }
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+
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+    rc = s390_pv_cmd(KVM_PV_INFO, &info;;
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+    if (rc) {
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+        error_report("KVM PV INFO cmd %x failed: %s",
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+                     info.header.id, strerror(-rc));
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+        return rc;
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+    }
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+    memcpy(&info_vm, &info.vm, sizeof(info.vm));
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+
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+    info.header.id = KVM_PV_INFO_DUMP;
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+    info.header.len_max = sizeof(info.header) + sizeof(info.dump);
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+    rc = s390_pv_cmd(KVM_PV_INFO, &info;;
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+    if (rc) {
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+        error_report("KVM PV INFO cmd %x failed: %s",
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+                     info.header.id, strerror(-rc));
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+        return rc;
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+    }
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+
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+    memcpy(&info_dump, &info.dump, sizeof(info.dump));
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+    info_valid = true;
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+
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+    return rc;
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+}
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+
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 int s390_pv_vm_enable(void)
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 {
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     return s390_pv_cmd(KVM_PV_ENABLE, NULL);
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@@ -114,6 +155,26 @@ void s390_pv_inject_reset_error(CPUState *cs)
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     env->regs[r1 + 1] = DIAG_308_RC_INVAL_FOR_PV;
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 }
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+uint64_t kvm_s390_pv_dmp_get_size_cpu(void)
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+{
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+    return info_dump.dump_cpu_buffer_len;
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+}
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+
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+uint64_t kvm_s390_pv_dmp_get_size_completion_data(void)
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+{
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+    return info_dump.dump_config_finalize_len;
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+}
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+
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+uint64_t kvm_s390_pv_dmp_get_size_mem_state(void)
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+{
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+    return info_dump.dump_config_mem_buffer_per_1m;
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+}
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+
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+bool kvm_s390_pv_info_basic_valid(void)
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+{
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+    return info_valid;
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+}
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+
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 #define TYPE_S390_PV_GUEST "s390-pv-guest"
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 OBJECT_DECLARE_SIMPLE_TYPE(S390PVGuest, S390_PV_GUEST)
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diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
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index bd80e72cf8..a9617ab79f 100644
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--- a/hw/s390x/s390-virtio-ccw.c
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+++ b/hw/s390x/s390-virtio-ccw.c
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@@ -365,6 +365,12 @@ static int s390_machine_protect(S390CcwMachineState *ms)
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     ms->pv = true;
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+    /* Will return 0 if API is not available since it's not vital */
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+    rc = s390_pv_query_info();
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+    if (rc) {
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+        goto out_err;
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+    }
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+
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     /* Set SE header and unpack */
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     rc = s390_ipl_prepare_pv_header();
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     if (rc) {
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diff --git a/include/hw/s390x/pv.h b/include/hw/s390x/pv.h
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index 1f1f545bfc..e5ea0eca16 100644
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--- a/include/hw/s390x/pv.h
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+++ b/include/hw/s390x/pv.h
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@@ -38,6 +38,7 @@ static inline bool s390_is_pv(void)
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     return ccw->pv;
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 }
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+int s390_pv_query_info(void);
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 int s390_pv_vm_enable(void);
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 void s390_pv_vm_disable(void);
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 int s390_pv_set_sec_parms(uint64_t origin, uint64_t length);
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@@ -46,8 +47,13 @@ void s390_pv_prep_reset(void);
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 int s390_pv_verify(void);
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 void s390_pv_unshare(void);
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 void s390_pv_inject_reset_error(CPUState *cs);
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+uint64_t kvm_s390_pv_dmp_get_size_cpu(void);
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+uint64_t kvm_s390_pv_dmp_get_size_mem_state(void);
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+uint64_t kvm_s390_pv_dmp_get_size_completion_data(void);
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+bool kvm_s390_pv_info_basic_valid(void);
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 #else /* CONFIG_KVM */
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 static inline bool s390_is_pv(void) { return false; }
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+static inline int s390_pv_query_info(void) { return 0; }
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 static inline int s390_pv_vm_enable(void) { return 0; }
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 static inline void s390_pv_vm_disable(void) {}
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 static inline int s390_pv_set_sec_parms(uint64_t origin, uint64_t length) { return 0; }
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@@ -56,6 +62,10 @@ static inline void s390_pv_prep_reset(void) {}
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 static inline int s390_pv_verify(void) { return 0; }
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 static inline void s390_pv_unshare(void) {}
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 static inline void s390_pv_inject_reset_error(CPUState *cs) {};
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+static inline uint64_t kvm_s390_pv_dmp_get_size_cpu(void) { return 0; }
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+static inline uint64_t kvm_s390_pv_dmp_get_size_mem_state(void) { return 0; }
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+static inline uint64_t kvm_s390_pv_dmp_get_size_completion_data(void) { return 0; }
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+static inline bool kvm_s390_pv_info_basic_valid(void) { return false; }
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 #endif /* CONFIG_KVM */
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 int s390_pv_kvm_init(ConfidentialGuestSupport *cgs, Error **errp);
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-- 
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2.37.3
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