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[PATCH v2 4/5] x86/HVM: slightly improve CMPXCHG16B emulation
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 1 Oct 2024 10:50:01 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 01 Oct 2024 08:50:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Using hvmemul_linear_mmio_write() directly (as fallback when mapping the
memory operand isn't possible) won't work properly when the access
crosses a RAM/MMIO boundary. Use linear_write() instead, which splits at
such boundaries as necessary.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -1645,10 +1645,8 @@ static int cf_check hvmemul_cmpxchg(
{
struct hvm_emulate_ctxt *hvmemul_ctxt =
container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
- struct vcpu *curr = current;
unsigned long addr;
uint32_t pfec = PFEC_page_present | PFEC_write_access;
- struct hvm_vcpu_io *hvio = &curr->arch.hvm.hvm_io;
int rc;
void *mapping = NULL;
@@ -1672,10 +1670,7 @@ static int cf_check hvmemul_cmpxchg(
if ( !mapping )
{
/* Fix this in case the guest is really relying on r-m-w atomicity. */
- return hvmemul_linear_mmio_write(addr, bytes, p_new, pfec,
- hvmemul_ctxt, addr,
- hvio->mmio_access.write_access &&
- hvio->mmio_gla == (addr & PAGE_MASK));
+ return linear_write(addr, bytes, p_new, pfec, hvmemul_ctxt);
}
switch ( bytes )
|
