... to avoid re-doing the same translation later again (in a retry, for
example). This doesn't help very often according to my testing, but
it's pretty cheap to have, and will be of further use subsequently.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -678,6 +678,19 @@ static struct hvm_mmio_cache *hvmemul_fi
return cache;
}
+static void latch_linear_to_phys(struct hvm_vcpu_io *vio, unsigned long gla,
+ unsigned long gpa, bool_t write)
+{
+ if ( vio->mmio_access.gla_valid )
+ return;
+
+ vio->mmio_gva = gla & PAGE_MASK;
+ vio->mmio_gpfn = PFN_DOWN(gpa);
+ vio->mmio_access = (struct npfec){ .gla_valid = 1,
+ .read_access = 1,
+ .write_access = write };
+}
+
static int hvmemul_linear_mmio_access(
unsigned long gla, unsigned int size, uint8_t dir, void *buffer,
uint32_t pfec, struct hvm_emulate_ctxt *hvmemul_ctxt, bool_t known_gpfn)
@@ -703,6 +716,8 @@ static int hvmemul_linear_mmio_access(
hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
+
+ latch_linear_to_phys(vio, gla, gpa, dir == IOREQ_WRITE);
}
for ( ;; )
x86/HVM: latch linear->phys translation results
... to avoid re-doing the same translation later again (in a retry, for
example). This doesn't help very often according to my testing, but
it's pretty cheap to have, and will be of further use subsequently.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -678,6 +678,19 @@ static struct hvm_mmio_cache *hvmemul_fi
return cache;
}
+static void latch_linear_to_phys(struct hvm_vcpu_io *vio, unsigned long gla,
+ unsigned long gpa, bool_t write)
+{
+ if ( vio->mmio_access.gla_valid )
+ return;
+
+ vio->mmio_gva = gla & PAGE_MASK;
+ vio->mmio_gpfn = PFN_DOWN(gpa);
+ vio->mmio_access = (struct npfec){ .gla_valid = 1,
+ .read_access = 1,
+ .write_access = write };
+}
+
static int hvmemul_linear_mmio_access(
unsigned long gla, unsigned int size, uint8_t dir, void *buffer,
uint32_t pfec, struct hvm_emulate_ctxt *hvmemul_ctxt, bool_t known_gpfn)
@@ -703,6 +716,8 @@ static int hvmemul_linear_mmio_access(
hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
+
+ latch_linear_to_phys(vio, gla, gpa, dir == IOREQ_WRITE);
}
for ( ;; )
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