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x86/Xen: correct commentary and parameter naming of xen_exchange_memory()

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As documented in comments in struct xen_memory_exchange, the input to the
hypercall is a set of MFNs which are to be removed from the domain, plus a
set of PFNs where the newly allocated MFNs are to appear. Present comment
and parameter naming don't correctly reflect that.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <7e0c8795-cc60-4b78-8601-6a999739467a@suse.com>
This commit is contained in:
Jan Beulich 2026-07-02 08:11:22 +02:00 committed by Juergen Gross
parent cbbef43bdc
commit fcd245ea75
1 changed files with 8 additions and 7 deletions
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15
arch/x86/xen/mmu_pv.c
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@ -2291,18 +2291,19 @@ static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
}
/*
* Perform the hypercall to exchange a region of our pfns to point to
* memory with the required contiguous alignment. Takes the pfns as
* input, and populates mfns as output.
* Perform the hypercall to exchange a region of our pages to point to memory
* with the required contiguous alignment. Takes as input the mfns to trade
* in (mfns_in) and the pfns where the new pages are to appear (fns_inout),
* and populates mfns as output (fns_inout).
*
* Returns a success code indicating whether the hypervisor was able to
* satisfy the request or not.
*/
static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
unsigned long *pfns_in,
unsigned long *mfns_in,
unsigned long extents_out,
unsigned int order_out,
unsigned long *mfns_out,
unsigned long *fns_inout,
unsigned int address_bits)
{
long rc;
@ -2312,13 +2313,13 @@ static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
.in = {
.nr_extents = extents_in,
.extent_order = order_in,
.extent_start = pfns_in,
.extent_start = mfns_in,
.domid = DOMID_SELF
},
.out = {
.nr_extents = extents_out,
.extent_order = order_out,
.extent_start = mfns_out,
.extent_start = fns_inout,
.address_bits = address_bits,
.domid = DOMID_SELF
}