From: Joao Martins <joao.m.martins@oracle.com>
This is just meant to serve as an example on how we can implement
hypercalls. xen_version specifically since Qemu does all kind of
feature controllability. So handling that here seems appropriate.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Implement kvm_gva_rw() safely]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
target/i386/xen.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/target/i386/xen.c b/target/i386/xen.c
index 708ab908a0..55beed1913 100644
--- a/target/i386/xen.c
+++ b/target/i386/xen.c
@@ -12,9 +12,51 @@
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "kvm/kvm_i386.h"
+#include "exec/address-spaces.h"
#include "xen.h"
#include "trace.h"
+#include "standard-headers/xen/version.h"
+
+static int kvm_gva_rw(CPUState *cs, uint64_t gva, void *_buf, size_t sz,
+ bool is_write)
+{
+ uint8_t *buf = (uint8_t *)_buf;
+ size_t i = 0, len = 0;
+ int ret;
+
+ for (i = 0; i < sz; i+= len) {
+ struct kvm_translation tr = {
+ .linear_address = gva + i,
+ };
+
+ len = TARGET_PAGE_SIZE - (tr.linear_address & ~TARGET_PAGE_MASK);
+ if (len > sz)