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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 16/18] x86/hvm: use ioreq_t to track in-flight state
Use an ioreq_t rather than open coded state, size, dir and data fields
in struct hvm_vcpu_io. This also allows PIO completion to be handled
similarly to MMIO completion by re-issuing the handle_pio() call.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
xen/arch/x86/hvm/emulate.c | 35 +++++++++++++++++++++--------------
xen/arch/x86/hvm/hvm.c | 15 ++++++++-------
xen/arch/x86/hvm/svm/nestedsvm.c | 2 +-
xen/arch/x86/hvm/vmx/realmode.c | 4 ++--
xen/include/asm-x86/hvm/vcpu.h | 12 ++++--------
5 files changed, 36 insertions(+), 32 deletions(-)
diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 23582af..57a93f2 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -92,6 +92,7 @@ static int hvmemul_do_io(
.df = df,
.data = data,
.data_is_ptr = data_is_addr, /* ioreq_t field name is misleading */
+ .state = STATE_IOREQ_READY,
};
void *p_data = (void *)data;
int rc;
@@ -129,12 +130,24 @@ static int hvmemul_do_io(
}
}
- switch ( vio->io_state )
+ switch ( vio->io_req.state )
{
case STATE_IOREQ_NONE:
break;
case STATE_IORESP_READY:
- vio->io_state = STATE_IOREQ_NONE;
+ vio->io_req.state = STATE_IOREQ_NONE;
+ p = vio->io_req;
+
+ /* Verify the emulation request has been correctly re-issued */
+ if ( (p.type != is_mmio ? IOREQ_TYPE_COPY : IOREQ_TYPE_PIO) ||
+ (p.addr != addr) ||
+ (p.size != size) ||
+ (p.count != reps) ||
+ (p.dir != dir) ||
+ (p.df != df) ||
+ (p.data_is_ptr != data_is_addr) )
+ domain_crash(curr->domain);
+
if ( data_is_addr || dir == IOREQ_WRITE )
return X86EMUL_UNHANDLEABLE;
goto finish_access;
@@ -142,11 +155,6 @@ static int hvmemul_do_io(
return X86EMUL_UNHANDLEABLE;
}
- vio->io_state = STATE_IOREQ_READY;
- vio->io_size = size;
- vio->io_dir = dir;
- vio->io_data_is_addr = data_is_addr;
-
if ( dir == IOREQ_WRITE )
{
if ( !data_is_addr )
@@ -155,13 +163,14 @@ static int hvmemul_do_io(
hvmtrace_io_assist(&p);
}
+ vio->io_req = p;
+
rc = hvm_io_intercept(&p);
switch ( rc )
{
case X86EMUL_OKAY:
- vio->io_data = p.data;
- vio->io_state = STATE_IOREQ_NONE;
+ vio->io_req.state = STATE_IOREQ_NONE;
break;
case X86EMUL_UNHANDLEABLE:
{
@@ -172,15 +181,13 @@ static int hvmemul_do_io(
if ( !s )
{
rc = hvm_process_io_intercept(&null_handler, &p);
- if ( rc == X86EMUL_OKAY )
- vio->io_data = p.data;
- vio->io_state = STATE_IOREQ_NONE;
+ vio->io_req.state = STATE_IOREQ_NONE;
}
else
{
rc = hvm_send_assist_req(s, &p);
if ( rc != X86EMUL_RETRY )
- vio->io_state = STATE_IOREQ_NONE;
+ vio->io_req.state = STATE_IOREQ_NONE;
else if ( data_is_addr || dir == IOREQ_WRITE )
rc = X86EMUL_OKAY;
}
@@ -199,7 +206,7 @@ static int hvmemul_do_io(
hvmtrace_io_assist(&p);
if ( !data_is_addr )
- memcpy(p_data, &vio->io_data, size);
+ memcpy(p_data, &p.data, size);
}
if ( is_mmio && !data_is_addr )
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 7411287..8abf29b 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -421,11 +421,11 @@ static void hvm_io_assist(ioreq_t *p)
if ( HVMIO_NEED_COMPLETION(vio) )
{
- vio->io_state = STATE_IORESP_READY;
- vio->io_data = p->data;
+ vio->io_req.state = STATE_IORESP_READY;
+ vio->io_req.data = p->data;
}
else
- vio->io_state = STATE_IOREQ_NONE;
+ vio->io_req.state = STATE_IOREQ_NONE;
msix_write_completion(curr);
vcpu_end_shutdown_deferral(curr);
@@ -501,11 +501,12 @@ void hvm_do_resume(struct vcpu *v)
(void)handle_mmio();
break;
case HVMIO_pio_completion:
- if ( vio->io_size == 4 ) /* Needs zero extension. */
- guest_cpu_user_regs()->rax = (uint32_t)vio->io_data;
+ if ( vio->io_req.size == 4 ) /* Needs zero extension. */
+ guest_cpu_user_regs()->rax = (uint32_t)vio->io_req.data;
else
- memcpy(&guest_cpu_user_regs()->rax, &vio->io_data, vio->io_size);
- vio->io_state = STATE_IOREQ_NONE;
+ memcpy(&guest_cpu_user_regs()->rax, &vio->io_req.data,
+ vio->io_req.size);
+ vio->io_req.state = STATE_IOREQ_NONE;
break;
case HVMIO_realmode_completion:
{
diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c
index 8b165c6..78667a2 100644
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -1231,7 +1231,7 @@ enum hvm_intblk nsvm_intr_blocked(struct vcpu *v)
* Delay the injection because this would result in delivering
* an interrupt *within* the execution of an instruction.
*/
- if ( v->arch.hvm_vcpu.hvm_io.io_state != STATE_IOREQ_NONE )
+ if ( v->arch.hvm_vcpu.hvm_io.io_req.state != STATE_IOREQ_NONE )
return hvm_intblk_shadow;
if ( !nv->nv_vmexit_pending && n2vmcb->exitintinfo.bytes != 0 ) {
diff --git a/xen/arch/x86/hvm/vmx/realmode.c b/xen/arch/x86/hvm/vmx/realmode.c
index 4135ad4..0f3124d 100644
--- a/xen/arch/x86/hvm/vmx/realmode.c
+++ b/xen/arch/x86/hvm/vmx/realmode.c
@@ -205,7 +205,7 @@ void vmx_realmode(struct cpu_user_regs *regs)
vmx_realmode_emulate_one(&hvmemul_ctxt);
- if ( vio->io_state != STATE_IOREQ_NONE || vio->mmio_retry )
+ if ( vio->io_req.state != STATE_IOREQ_NONE || vio->mmio_retry )
break;
/* Stop emulating unless our segment state is not safe */
@@ -219,7 +219,7 @@ void vmx_realmode(struct cpu_user_regs *regs)
}
/* Need to emulate next time if we've started an IO operation */
- if ( vio->io_state != STATE_IOREQ_NONE )
+ if ( vio->io_req.state != STATE_IOREQ_NONE )
curr->arch.hvm_vmx.vmx_emulate = 1;
if ( !curr->arch.hvm_vmx.vmx_emulate && !curr->arch.hvm_vmx.vmx_realmode )
diff --git a/xen/include/asm-x86/hvm/vcpu.h b/xen/include/asm-x86/hvm/vcpu.h
index f797518..7338638 100644
--- a/xen/include/asm-x86/hvm/vcpu.h
+++ b/xen/include/asm-x86/hvm/vcpu.h
@@ -44,17 +44,13 @@ struct hvm_vcpu_asid {
struct hvm_vcpu_io {
/* I/O request in flight to device model. */
- uint8_t io_state;
- unsigned long io_data;
- int io_size;
+ ioreq_t io_req;
enum hvm_io_completion io_completion;
- uint8_t io_dir;
- uint8_t io_data_is_addr;
#define HVMIO_NEED_COMPLETION(_vio) \
- ( ((_vio)->io_state == STATE_IOREQ_READY) && \
- !(_vio)->io_data_is_addr && \
- ((_vio)->io_dir == IOREQ_READ) )
+ ( ((_vio)->io_req.state == STATE_IOREQ_READY) && \
+ !(_vio)->io_req.data_is_ptr && \
+ ((_vio)->io_req.dir == IOREQ_READ) )
/*
* HVM emulation:
--
1.7.10.4
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